./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 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/half_2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 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-2329fc7 [2022-12-14 13:58:37,555 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 13:58:37,557 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 13:58:37,569 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 13:58:37,569 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 13:58:37,570 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 13:58:37,571 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 13:58:37,572 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 13:58:37,573 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 13:58:37,573 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 13:58:37,574 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 13:58:37,575 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 13:58:37,575 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 13:58:37,576 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 13:58:37,576 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 13:58:37,577 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 13:58:37,578 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 13:58:37,578 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 13:58:37,579 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 13:58:37,580 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 13:58:37,581 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 13:58:37,582 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 13:58:37,583 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 13:58:37,583 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 13:58:37,585 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 13:58:37,585 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 13:58:37,586 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 13:58:37,586 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 13:58:37,586 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 13:58:37,587 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 13:58:37,587 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 13:58:37,588 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 13:58:37,588 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 13:58:37,589 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 13:58:37,589 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 13:58:37,589 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 13:58:37,590 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 13:58:37,590 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 13:58:37,590 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 13:58:37,591 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 13:58:37,591 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 13:58:37,592 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 13:58:37,606 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 13:58:37,606 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 13:58:37,606 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 13:58:37,606 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 13:58:37,607 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 13:58:37,607 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 13:58:37,607 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 13:58:37,607 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 13:58:37,607 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 13:58:37,607 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 13:58:37,608 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 13:58:37,608 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 13:58:37,608 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 13:58:37,608 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 13:58:37,608 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 13:58:37,608 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 13:58:37,609 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 13:58:37,609 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 13:58:37,609 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 13:58:37,609 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 13:58:37,610 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 13:58:37,610 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 13:58:37,610 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 13:58:37,610 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 13:58:37,610 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 13:58:37,610 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 13:58:37,610 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 13:58:37,611 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 13:58:37,611 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 13:58:37,611 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 13:58:37,611 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 13:58:37,611 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 13:58:37,611 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 13:58:37,611 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 13:58:37,612 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 13:58:37,612 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 13:58:37,612 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 13:58:37,612 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 13:58:37,612 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 13:58:37,612 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 13:58:37,612 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 13:58:37,613 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_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0b362a98d328467ff4a069dbed2be3429090ca070e60d49c76297e4bb94402b7 [2022-12-14 13:58:37,790 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 13:58:37,810 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 13:58:37,813 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 13:58:37,814 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 13:58:37,814 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 13:58:37,816 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/loop-invgen/half_2.i [2022-12-14 13:58:40,435 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 13:58:40,582 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 13:58:40,582 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/sv-benchmarks/c/loop-invgen/half_2.i [2022-12-14 13:58:40,586 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/data/57fd80948/fe98d8a1fb374a25a601700cd3b38719/FLAG6fb04b9f0 [2022-12-14 13:58:40,602 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/data/57fd80948/fe98d8a1fb374a25a601700cd3b38719 [2022-12-14 13:58:40,604 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 13:58:40,605 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 13:58:40,606 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 13:58:40,606 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 13:58:40,609 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 13:58:40,610 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 01:58:40" (1/1) ... [2022-12-14 13:58:40,611 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@219a2e33 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:58:40, skipping insertion in model container [2022-12-14 13:58:40,611 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 01:58:40" (1/1) ... [2022-12-14 13:58:40,619 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 13:58:40,634 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 13:58:40,753 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/sv-benchmarks/c/loop-invgen/half_2.i[893,906] [2022-12-14 13:58:40,764 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 13:58:40,773 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 13:58:40,783 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/sv-benchmarks/c/loop-invgen/half_2.i[893,906] [2022-12-14 13:58:40,786 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 13:58:40,798 INFO L208 MainTranslator]: Completed translation [2022-12-14 13:58:40,798 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:58:40 WrapperNode [2022-12-14 13:58:40,798 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 13:58:40,800 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 13:58:40,800 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 13:58:40,800 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 13:58:40,806 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:58:40" (1/1) ... [2022-12-14 13:58:40,812 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:58:40" (1/1) ... [2022-12-14 13:58:40,827 INFO L138 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 48 [2022-12-14 13:58:40,827 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 13:58:40,828 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 13:58:40,828 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 13:58:40,828 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 13:58:40,837 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:58:40" (1/1) ... [2022-12-14 13:58:40,837 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:58:40" (1/1) ... [2022-12-14 13:58:40,838 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:58:40" (1/1) ... [2022-12-14 13:58:40,838 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:58:40" (1/1) ... [2022-12-14 13:58:40,841 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:58:40" (1/1) ... [2022-12-14 13:58:40,844 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:58:40" (1/1) ... [2022-12-14 13:58:40,845 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:58:40" (1/1) ... [2022-12-14 13:58:40,846 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:58:40" (1/1) ... [2022-12-14 13:58:40,847 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 13:58:40,848 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 13:58:40,848 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 13:58:40,848 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 13:58:40,849 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:58:40" (1/1) ... [2022-12-14 13:58:40,855 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 13:58:40,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:58:40,878 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 13:58:40,880 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 13:58:40,915 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 13:58:40,915 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 13:58:40,915 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 13:58:40,915 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 13:58:40,974 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 13:58:40,976 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 13:58:41,049 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 13:58:41,068 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 13:58:41,068 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-12-14 13:58:41,070 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 01:58:41 BoogieIcfgContainer [2022-12-14 13:58:41,070 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 13:58:41,072 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 13:58:41,072 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 13:58:41,075 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 13:58:41,075 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 01:58:40" (1/3) ... [2022-12-14 13:58:41,076 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@67dceaaa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 01:58:41, skipping insertion in model container [2022-12-14 13:58:41,076 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 01:58:40" (2/3) ... [2022-12-14 13:58:41,077 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@67dceaaa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 01:58:41, skipping insertion in model container [2022-12-14 13:58:41,077 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 01:58:41" (3/3) ... [2022-12-14 13:58:41,078 INFO L112 eAbstractionObserver]: Analyzing ICFG half_2.i [2022-12-14 13:58:41,094 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 13:58:41,094 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 13:58:41,127 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 13:58:41,132 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;@37530aa7, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 13:58:41,132 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 13:58:41,136 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) [2022-12-14 13:58:41,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-12-14 13:58:41,140 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:58:41,140 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-12-14 13:58:41,141 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:58:41,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:58:41,144 INFO L85 PathProgramCache]: Analyzing trace with hash -2025251484, now seen corresponding path program 1 times [2022-12-14 13:58:41,151 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:58:41,151 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [138326890] [2022-12-14 13:58:41,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:41,151 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:58:41,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:41,414 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:41,414 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:58:41,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [138326890] [2022-12-14 13:58:41,415 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [138326890] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 13:58:41,416 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 13:58:41,416 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-12-14 13:58:41,418 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753689303] [2022-12-14 13:58:41,418 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:58:41,422 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 13:58:41,422 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:58:41,448 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 13:58:41,449 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-12-14 13:58:41,450 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) [2022-12-14 13:58:41,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:58:41,511 INFO L93 Difference]: Finished difference Result 26 states and 32 transitions. [2022-12-14 13:58:41,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 13:58:41,513 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 [2022-12-14 13:58:41,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:58:41,518 INFO L225 Difference]: With dead ends: 26 [2022-12-14 13:58:41,519 INFO L226 Difference]: Without dead ends: 13 [2022-12-14 13:58:41,520 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2022-12-14 13:58:41,523 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 13 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 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, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 13:58:41,524 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 11 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 13:58:41,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-12-14 13:58:41,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 11. [2022-12-14 13:58:41,545 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) [2022-12-14 13:58:41,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 13 transitions. [2022-12-14 13:58:41,546 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 13 transitions. Word has length 6 [2022-12-14 13:58:41,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:58:41,546 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 13 transitions. [2022-12-14 13:58:41,546 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) [2022-12-14 13:58:41,547 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 13 transitions. [2022-12-14 13:58:41,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-12-14 13:58:41,547 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:58:41,547 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:58:41,547 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 13:58:41,548 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:58:41,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:58:41,548 INFO L85 PathProgramCache]: Analyzing trace with hash 1610042692, now seen corresponding path program 1 times [2022-12-14 13:58:41,549 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:58:41,549 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1493208403] [2022-12-14 13:58:41,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:41,549 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:58:41,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:41,698 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:41,699 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:58:41,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1493208403] [2022-12-14 13:58:41,699 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1493208403] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:58:41,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1666254352] [2022-12-14 13:58:41,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:41,700 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:41,700 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:58:41,701 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:58:41,702 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 13:58:41,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:41,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 13:58:41,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:58:41,887 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:41,888 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:58:42,036 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:42,036 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1666254352] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:58:42,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1685052277] [2022-12-14 13:58:42,056 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 13:58:42,056 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:58:42,060 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:58:42,065 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:58:42,065 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:58:42,191 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:58:42,377 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 [2022-12-14 13:58:42,378 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:58:42,378 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:58:42,378 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2022-12-14 13:58:42,379 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1326645684] [2022-12-14 13:58:42,379 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:58:42,379 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-12-14 13:58:42,380 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:58:42,380 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-12-14 13:58:42,381 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2022-12-14 13:58:42,381 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) [2022-12-14 13:58:42,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:58:42,745 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2022-12-14 13:58:42,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-12-14 13:58:42,745 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 [2022-12-14 13:58:42,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:58:42,746 INFO L225 Difference]: With dead ends: 36 [2022-12-14 13:58:42,746 INFO L226 Difference]: Without dead ends: 34 [2022-12-14 13:58:42,747 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=159, Invalid=653, Unknown=0, NotChecked=0, Total=812 [2022-12-14 13:58:42,748 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 53 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:58:42,748 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 26 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:58:42,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-12-14 13:58:42,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 16. [2022-12-14 13:58:42,753 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) [2022-12-14 13:58:42,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2022-12-14 13:58:42,754 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 7 [2022-12-14 13:58:42,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:58:42,754 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2022-12-14 13:58:42,754 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) [2022-12-14 13:58:42,754 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2022-12-14 13:58:42,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-12-14 13:58:42,755 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:58:42,755 INFO L195 NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1] [2022-12-14 13:58:42,761 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 13:58:42,956 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:42,957 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:58:42,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:58:42,959 INFO L85 PathProgramCache]: Analyzing trace with hash 49336644, now seen corresponding path program 2 times [2022-12-14 13:58:42,960 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:58:42,961 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [355257645] [2022-12-14 13:58:42,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:42,962 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:58:42,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:43,152 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:43,152 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:58:43,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [355257645] [2022-12-14 13:58:43,153 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [355257645] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:58:43,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [950027812] [2022-12-14 13:58:43,153 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:58:43,153 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:43,154 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:58:43,155 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:58:43,156 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 13:58:43,187 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 13:58:43,187 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:58:43,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 14 conjunts are in the unsatisfiable core [2022-12-14 13:58:43,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:58:43,246 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:43,247 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:58:43,302 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:43,303 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [950027812] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:58:43,303 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1180021736] [2022-12-14 13:58:43,305 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 13:58:43,305 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:58:43,306 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:58:43,306 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:58:43,306 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:58:43,372 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:58:43,548 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 [2022-12-14 13:58:43,548 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:58:43,548 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:58:43,548 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 15 [2022-12-14 13:58:43,548 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759942759] [2022-12-14 13:58:43,549 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:58:43,549 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-12-14 13:58:43,549 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:58:43,550 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-12-14 13:58:43,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=304, Unknown=0, NotChecked=0, Total=380 [2022-12-14 13:58:43,550 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) [2022-12-14 13:58:43,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:58:43,826 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2022-12-14 13:58:43,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-12-14 13:58:43,827 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 [2022-12-14 13:58:43,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:58:43,828 INFO L225 Difference]: With dead ends: 46 [2022-12-14 13:58:43,828 INFO L226 Difference]: Without dead ends: 44 [2022-12-14 13:58:43,828 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=237, Invalid=885, Unknown=0, NotChecked=0, Total=1122 [2022-12-14 13:58:43,830 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 53 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 192 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:58:43,830 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 54 Invalid, 192 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 177 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:58:43,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-12-14 13:58:43,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 16. [2022-12-14 13:58:43,838 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) [2022-12-14 13:58:43,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2022-12-14 13:58:43,838 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 9 [2022-12-14 13:58:43,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:58:43,839 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2022-12-14 13:58:43,839 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) [2022-12-14 13:58:43,839 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2022-12-14 13:58:43,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-12-14 13:58:43,839 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:58:43,839 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:58:43,844 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 13:58:44,040 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:44,041 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:58:44,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:58:44,043 INFO L85 PathProgramCache]: Analyzing trace with hash 1438439610, now seen corresponding path program 1 times [2022-12-14 13:58:44,043 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:58:44,044 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1250281261] [2022-12-14 13:58:44,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:44,045 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:58:44,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:44,229 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:44,229 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:58:44,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1250281261] [2022-12-14 13:58:44,229 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1250281261] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:58:44,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [333888480] [2022-12-14 13:58:44,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:44,230 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:44,230 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:58:44,231 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:58:44,232 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 13:58:44,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:44,259 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 13:58:44,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:58:44,279 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:44,279 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 13:58:44,279 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [333888480] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 13:58:44,279 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 13:58:44,279 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2022-12-14 13:58:44,279 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497724701] [2022-12-14 13:58:44,280 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 13:58:44,280 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 13:58:44,280 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:58:44,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 13:58:44,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2022-12-14 13:58:44,281 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) [2022-12-14 13:58:44,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:58:44,312 INFO L93 Difference]: Finished difference Result 23 states and 27 transitions. [2022-12-14 13:58:44,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 13:58:44,312 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 [2022-12-14 13:58:44,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:58:44,312 INFO L225 Difference]: With dead ends: 23 [2022-12-14 13:58:44,312 INFO L226 Difference]: Without dead ends: 16 [2022-12-14 13:58:44,313 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 [2022-12-14 13:58:44,314 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 [2022-12-14 13:58:44,314 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] [2022-12-14 13:58:44,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-12-14 13:58:44,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-12-14 13:58:44,320 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) [2022-12-14 13:58:44,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2022-12-14 13:58:44,321 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 9 [2022-12-14 13:58:44,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:58:44,321 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2022-12-14 13:58:44,321 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) [2022-12-14 13:58:44,321 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2022-12-14 13:58:44,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-12-14 13:58:44,321 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:58:44,322 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 13:58:44,326 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 13:58:44,522 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:44,522 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:58:44,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:58:44,523 INFO L85 PathProgramCache]: Analyzing trace with hash 543513786, now seen corresponding path program 1 times [2022-12-14 13:58:44,523 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:58:44,523 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1200717363] [2022-12-14 13:58:44,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:44,523 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:58:44,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:44,684 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:44,684 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:58:44,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1200717363] [2022-12-14 13:58:44,685 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1200717363] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:58:44,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [952399110] [2022-12-14 13:58:44,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:44,685 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:44,685 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:58:44,686 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:58:44,687 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 13:58:44,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:44,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 13:58:44,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:58:44,804 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:44,804 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:58:44,995 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:44,996 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [952399110] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:58:44,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [831920020] [2022-12-14 13:58:44,997 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 13:58:44,997 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:58:44,997 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:58:44,997 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:58:44,998 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:58:45,116 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:58:45,392 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 [2022-12-14 13:58:45,393 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:58:45,393 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:58:45,393 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 18 [2022-12-14 13:58:45,393 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912631232] [2022-12-14 13:58:45,393 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:58:45,393 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-12-14 13:58:45,393 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:58:45,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-12-14 13:58:45,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=465, Unknown=0, NotChecked=0, Total=552 [2022-12-14 13:58:45,394 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) [2022-12-14 13:58:45,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:58:45,871 INFO L93 Difference]: Finished difference Result 42 states and 48 transitions. [2022-12-14 13:58:45,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-12-14 13:58:45,871 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 [2022-12-14 13:58:45,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:58:45,871 INFO L225 Difference]: With dead ends: 42 [2022-12-14 13:58:45,871 INFO L226 Difference]: Without dead ends: 25 [2022-12-14 13:58:45,872 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=249, Invalid=1233, Unknown=0, NotChecked=0, Total=1482 [2022-12-14 13:58:45,873 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 55 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 154 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 177 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 154 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:58:45,873 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 25 Invalid, 177 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 154 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:58:45,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-12-14 13:58:45,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 16. [2022-12-14 13:58:45,879 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) [2022-12-14 13:58:45,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2022-12-14 13:58:45,879 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2022-12-14 13:58:45,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:58:45,883 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2022-12-14 13:58:45,884 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) [2022-12-14 13:58:45,884 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2022-12-14 13:58:45,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-12-14 13:58:45,884 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:58:45,884 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1] [2022-12-14 13:58:45,888 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 13:58:46,085 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:46,086 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:58:46,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:58:46,088 INFO L85 PathProgramCache]: Analyzing trace with hash -1965317756, now seen corresponding path program 2 times [2022-12-14 13:58:46,088 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:58:46,088 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1770060192] [2022-12-14 13:58:46,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:46,089 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:58:46,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:46,308 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:46,308 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:58:46,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1770060192] [2022-12-14 13:58:46,308 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1770060192] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:58:46,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1114092853] [2022-12-14 13:58:46,308 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:58:46,308 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:46,308 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:58:46,309 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:58:46,310 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 13:58:46,341 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 13:58:46,341 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:58:46,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 13:58:46,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:58:46,478 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:46,478 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:58:46,732 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:46,733 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1114092853] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:58:46,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [299162722] [2022-12-14 13:58:46,734 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 13:58:46,734 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:58:46,734 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:58:46,735 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:58:46,735 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:58:46,809 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:58:47,127 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 [2022-12-14 13:58:47,127 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:58:47,128 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:58:47,128 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 26 [2022-12-14 13:58:47,128 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1303998975] [2022-12-14 13:58:47,128 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:58:47,128 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-12-14 13:58:47,128 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:58:47,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-12-14 13:58:47,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=861, Unknown=0, NotChecked=0, Total=992 [2022-12-14 13:58:47,130 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) [2022-12-14 13:58:47,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:58:47,370 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2022-12-14 13:58:47,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-12-14 13:58:47,370 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 [2022-12-14 13:58:47,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:58:47,370 INFO L225 Difference]: With dead ends: 32 [2022-12-14 13:58:47,370 INFO L226 Difference]: Without dead ends: 18 [2022-12-14 13:58:47,371 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 358 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=209, Invalid=1351, Unknown=0, NotChecked=0, Total=1560 [2022-12-14 13:58:47,372 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 24 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 202 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 202 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:58:47,372 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 37 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 202 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:58:47,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-12-14 13:58:47,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2022-12-14 13:58:47,377 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) [2022-12-14 13:58:47,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2022-12-14 13:58:47,378 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 15 [2022-12-14 13:58:47,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:58:47,378 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2022-12-14 13:58:47,378 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) [2022-12-14 13:58:47,378 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2022-12-14 13:58:47,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-12-14 13:58:47,379 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:58:47,379 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1] [2022-12-14 13:58:47,383 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-12-14 13:58:47,579 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-12-14 13:58:47,580 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:58:47,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:58:47,581 INFO L85 PathProgramCache]: Analyzing trace with hash -772452956, now seen corresponding path program 3 times [2022-12-14 13:58:47,581 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:58:47,582 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1575101241] [2022-12-14 13:58:47,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:47,582 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:58:47,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:47,725 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 3 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:47,725 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:58:47,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1575101241] [2022-12-14 13:58:47,726 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1575101241] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:58:47,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [295070833] [2022-12-14 13:58:47,726 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:58:47,726 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:47,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:58:47,727 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:58:47,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 13:58:47,758 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:58:47,758 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:58:47,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 13:58:47,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:58:47,822 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:47,822 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:58:47,893 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:47,893 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [295070833] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:58:47,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1155943886] [2022-12-14 13:58:47,894 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 13:58:47,894 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:58:47,894 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:58:47,895 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:58:47,895 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:58:47,989 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:58:48,266 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 [2022-12-14 13:58:48,266 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:58:48,266 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:58:48,266 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2022-12-14 13:58:48,266 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92520608] [2022-12-14 13:58:48,266 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:58:48,267 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-12-14 13:58:48,267 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:58:48,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-12-14 13:58:48,267 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=507, Unknown=0, NotChecked=0, Total=600 [2022-12-14 13:58:48,267 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) [2022-12-14 13:58:48,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:58:48,407 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2022-12-14 13:58:48,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-12-14 13:58:48,407 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 [2022-12-14 13:58:48,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:58:48,407 INFO L225 Difference]: With dead ends: 28 [2022-12-14 13:58:48,407 INFO L226 Difference]: Without dead ends: 26 [2022-12-14 13:58:48,408 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 30 SyntacticMatches, 3 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=179, Invalid=877, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 13:58:48,408 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 42 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 13:58:48,408 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 24 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 13:58:48,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-12-14 13:58:48,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 20. [2022-12-14 13:58:48,413 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) [2022-12-14 13:58:48,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2022-12-14 13:58:48,413 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 16 [2022-12-14 13:58:48,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:58:48,413 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2022-12-14 13:58:48,413 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) [2022-12-14 13:58:48,413 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2022-12-14 13:58:48,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-12-14 13:58:48,414 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:58:48,414 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1] [2022-12-14 13:58:48,418 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-12-14 13:58:48,614 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:48,615 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:58:48,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:58:48,616 INFO L85 PathProgramCache]: Analyzing trace with hash 293585018, now seen corresponding path program 4 times [2022-12-14 13:58:48,617 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:58:48,617 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [979784064] [2022-12-14 13:58:48,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:48,617 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:58:48,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:48,924 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:48,924 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:58:48,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [979784064] [2022-12-14 13:58:48,925 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [979784064] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:58:48,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1548358236] [2022-12-14 13:58:48,925 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:58:48,925 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:48,925 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:58:48,926 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:58:48,927 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 13:58:48,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:48,961 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 24 conjunts are in the unsatisfiable core [2022-12-14 13:58:48,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:58:49,102 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:49,103 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:58:49,456 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:49,456 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1548358236] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:58:49,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [383574801] [2022-12-14 13:58:49,457 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 13:58:49,457 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:58:49,458 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:58:49,458 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:58:49,458 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:58:49,521 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:58:49,831 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 [2022-12-14 13:58:49,831 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:58:49,831 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:58:49,831 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 28 [2022-12-14 13:58:49,832 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [942895110] [2022-12-14 13:58:49,832 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:58:49,832 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-12-14 13:58:49,832 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:58:49,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-12-14 13:58:49,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=968, Unknown=0, NotChecked=0, Total=1122 [2022-12-14 13:58:49,833 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) [2022-12-14 13:58:50,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:58:50,538 INFO L93 Difference]: Finished difference Result 55 states and 63 transitions. [2022-12-14 13:58:50,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-12-14 13:58:50,538 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 [2022-12-14 13:58:50,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:58:50,539 INFO L225 Difference]: With dead ends: 55 [2022-12-14 13:58:50,539 INFO L226 Difference]: Without dead ends: 38 [2022-12-14 13:58:50,540 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 674 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=401, Invalid=2461, Unknown=0, NotChecked=0, Total=2862 [2022-12-14 13:58:50,540 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 63 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 307 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 336 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 13:58:50,541 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 46 Invalid, 336 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 307 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 13:58:50,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-12-14 13:58:50,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 28. [2022-12-14 13:58:50,549 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) [2022-12-14 13:58:50,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2022-12-14 13:58:50,549 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 19 [2022-12-14 13:58:50,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:58:50,549 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2022-12-14 13:58:50,549 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) [2022-12-14 13:58:50,549 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2022-12-14 13:58:50,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-12-14 13:58:50,550 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:58:50,550 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1] [2022-12-14 13:58:50,554 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 13:58:50,750 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:50,751 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:58:50,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:58:50,752 INFO L85 PathProgramCache]: Analyzing trace with hash -486816316, now seen corresponding path program 5 times [2022-12-14 13:58:50,753 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:58:50,753 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1533682858] [2022-12-14 13:58:50,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:50,754 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:58:50,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:51,094 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 12 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:51,094 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:58:51,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1533682858] [2022-12-14 13:58:51,094 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1533682858] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:58:51,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1145638075] [2022-12-14 13:58:51,094 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:58:51,094 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:51,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:58:51,095 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:58:51,096 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 13:58:51,137 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-12-14 13:58:51,138 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:58:51,139 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 29 conjunts are in the unsatisfiable core [2022-12-14 13:58:51,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:58:51,486 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:51,486 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:58:52,058 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:52,058 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1145638075] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:58:52,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2057349570] [2022-12-14 13:58:52,059 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 13:58:52,059 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:58:52,059 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:58:52,059 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:58:52,059 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:58:52,131 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:58:52,544 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 [2022-12-14 13:58:52,544 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:58:52,544 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:58:52,544 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 16] total 42 [2022-12-14 13:58:52,544 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2049613729] [2022-12-14 13:58:52,545 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:58:52,545 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-12-14 13:58:52,545 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:58:52,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-12-14 13:58:52,547 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=270, Invalid=1986, Unknown=0, NotChecked=0, Total=2256 [2022-12-14 13:58:52,547 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) [2022-12-14 13:58:53,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:58:53,190 INFO L93 Difference]: Finished difference Result 51 states and 57 transitions. [2022-12-14 13:58:53,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-12-14 13:58:53,190 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 [2022-12-14 13:58:53,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:58:53,190 INFO L225 Difference]: With dead ends: 51 [2022-12-14 13:58:53,190 INFO L226 Difference]: Without dead ends: 31 [2022-12-14 13:58:53,191 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 975 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=473, Invalid=3309, Unknown=0, NotChecked=0, Total=3782 [2022-12-14 13:58:53,191 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 37 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 362 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 385 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 362 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 13:58:53,192 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 40 Invalid, 385 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 362 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 13:58:53,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-12-14 13:58:53,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2022-12-14 13:58:53,199 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) [2022-12-14 13:58:53,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2022-12-14 13:58:53,200 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 23 [2022-12-14 13:58:53,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:58:53,200 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2022-12-14 13:58:53,200 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) [2022-12-14 13:58:53,200 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2022-12-14 13:58:53,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-12-14 13:58:53,200 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:58:53,200 INFO L195 NwaCegarLoop]: trace histogram [9, 4, 3, 3, 1, 1, 1, 1, 1] [2022-12-14 13:58:53,204 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-12-14 13:58:53,400 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:53,401 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:58:53,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:58:53,401 INFO L85 PathProgramCache]: Analyzing trace with hash -711895910, now seen corresponding path program 6 times [2022-12-14 13:58:53,401 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:58:53,401 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [467878733] [2022-12-14 13:58:53,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:53,401 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:58:53,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:53,550 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 28 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:53,550 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:58:53,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [467878733] [2022-12-14 13:58:53,550 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [467878733] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:58:53,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1299377498] [2022-12-14 13:58:53,551 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:58:53,551 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:53,551 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:58:53,551 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:58:53,552 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 13:58:53,592 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:58:53,592 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:58:53,593 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 29 conjunts are in the unsatisfiable core [2022-12-14 13:58:53,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:58:53,764 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:53,764 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:58:53,935 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:53,935 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1299377498] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:58:53,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1668228458] [2022-12-14 13:58:53,937 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 13:58:53,937 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:58:53,937 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:58:53,937 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:58:53,937 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:58:54,006 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:58:54,313 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 [2022-12-14 13:58:54,313 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:58:54,313 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:58:54,313 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 39 [2022-12-14 13:58:54,313 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1114756769] [2022-12-14 13:58:54,314 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:58:54,314 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-12-14 13:58:54,314 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:58:54,314 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-12-14 13:58:54,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=345, Invalid=1635, Unknown=0, NotChecked=0, Total=1980 [2022-12-14 13:58:54,315 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) [2022-12-14 13:58:54,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:58:54,922 INFO L93 Difference]: Finished difference Result 97 states and 108 transitions. [2022-12-14 13:58:54,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-12-14 13:58:54,922 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 [2022-12-14 13:58:54,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:58:54,922 INFO L225 Difference]: With dead ends: 97 [2022-12-14 13:58:54,922 INFO L226 Difference]: Without dead ends: 95 [2022-12-14 13:58:54,923 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1633 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1185, Invalid=4365, Unknown=0, NotChecked=0, Total=5550 [2022-12-14 13:58:54,924 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 136 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 462 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 514 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 462 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 13:58:54,924 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [136 Valid, 54 Invalid, 514 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 462 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 13:58:54,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-12-14 13:58:54,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 40. [2022-12-14 13:58:54,939 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) [2022-12-14 13:58:54,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2022-12-14 13:58:54,939 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 24 [2022-12-14 13:58:54,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:58:54,939 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2022-12-14 13:58:54,939 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) [2022-12-14 13:58:54,939 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2022-12-14 13:58:54,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-12-14 13:58:54,939 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:58:54,940 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1, 1] [2022-12-14 13:58:54,944 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-12-14 13:58:55,140 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-12-14 13:58:55,141 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:58:55,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:58:55,142 INFO L85 PathProgramCache]: Analyzing trace with hash 569136186, now seen corresponding path program 7 times [2022-12-14 13:58:55,143 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:58:55,143 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [992914929] [2022-12-14 13:58:55,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:55,143 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:58:55,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:55,490 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 22 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:55,490 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:58:55,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [992914929] [2022-12-14 13:58:55,490 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [992914929] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:58:55,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [318114963] [2022-12-14 13:58:55,490 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:58:55,490 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:55,490 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:58:55,491 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:58:55,492 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 13:58:55,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:55,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 32 conjunts are in the unsatisfiable core [2022-12-14 13:58:55,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:58:55,756 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:55,757 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:58:56,337 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:56,337 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [318114963] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:58:56,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1481019574] [2022-12-14 13:58:56,338 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 13:58:56,339 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:58:56,339 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:58:56,339 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:58:56,339 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:58:56,397 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:58:56,718 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 [2022-12-14 13:58:56,719 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:58:56,719 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:58:56,719 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 38 [2022-12-14 13:58:56,719 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636483404] [2022-12-14 13:58:56,719 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:58:56,719 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-12-14 13:58:56,719 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:58:56,720 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-12-14 13:58:56,720 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=249, Invalid=1643, Unknown=0, NotChecked=0, Total=1892 [2022-12-14 13:58:56,720 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) [2022-12-14 13:58:57,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:58:57,980 INFO L93 Difference]: Finished difference Result 124 states and 133 transitions. [2022-12-14 13:58:57,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-12-14 13:58:57,980 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 [2022-12-14 13:58:57,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:58:57,980 INFO L225 Difference]: With dead ends: 124 [2022-12-14 13:58:57,980 INFO L226 Difference]: Without dead ends: 101 [2022-12-14 13:58:57,981 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1265 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=686, Invalid=4426, Unknown=0, NotChecked=0, Total=5112 [2022-12-14 13:58:57,982 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 94 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 508 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 561 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 508 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 13:58:57,982 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [94 Valid, 67 Invalid, 561 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 508 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 13:58:57,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-12-14 13:58:57,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 40. [2022-12-14 13:58:57,999 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) [2022-12-14 13:58:57,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2022-12-14 13:58:58,000 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 27 [2022-12-14 13:58:58,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:58:58,000 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2022-12-14 13:58:58,000 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) [2022-12-14 13:58:58,000 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2022-12-14 13:58:58,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-12-14 13:58:58,001 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:58:58,001 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1, 1] [2022-12-14 13:58:58,006 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-12-14 13:58:58,202 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-12-14 13:58:58,202 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:58:58,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:58:58,204 INFO L85 PathProgramCache]: Analyzing trace with hash 1681635844, now seen corresponding path program 8 times [2022-12-14 13:58:58,204 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:58:58,204 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [713069758] [2022-12-14 13:58:58,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:58:58,205 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:58:58,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:58:58,614 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 35 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:58,615 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:58:58,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [713069758] [2022-12-14 13:58:58,615 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [713069758] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:58:58,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1244303913] [2022-12-14 13:58:58,615 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:58:58,615 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:58:58,615 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:58:58,616 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:58:58,617 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-12-14 13:58:58,662 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-12-14 13:58:58,663 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:58:58,664 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 35 conjunts are in the unsatisfiable core [2022-12-14 13:58:58,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:58:59,105 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:59,105 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:58:59,764 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:58:59,764 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1244303913] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:58:59,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1083773494] [2022-12-14 13:58:59,765 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 13:58:59,765 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:58:59,766 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:58:59,766 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:58:59,766 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:58:59,821 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:59:00,233 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 [2022-12-14 13:59:00,233 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:59:00,233 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:59:00,233 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 20, 20] total 54 [2022-12-14 13:59:00,233 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431017757] [2022-12-14 13:59:00,233 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:59:00,234 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-12-14 13:59:00,234 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:59:00,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-12-14 13:59:00,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=3136, Unknown=0, NotChecked=0, Total=3540 [2022-12-14 13:59:00,235 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) [2022-12-14 13:59:01,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:59:01,397 INFO L93 Difference]: Finished difference Result 69 states and 73 transitions. [2022-12-14 13:59:01,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-12-14 13:59:01,397 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 [2022-12-14 13:59:01,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:59:01,397 INFO L225 Difference]: With dead ends: 69 [2022-12-14 13:59:01,397 INFO L226 Difference]: Without dead ends: 43 [2022-12-14 13:59:01,398 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1569 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=715, Invalid=5291, Unknown=0, NotChecked=0, Total=6006 [2022-12-14 13:59:01,399 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 55 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 631 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 683 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 631 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 13:59:01,399 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 60 Invalid, 683 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 631 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 13:59:01,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-12-14 13:59:01,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2022-12-14 13:59:01,415 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) [2022-12-14 13:59:01,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2022-12-14 13:59:01,415 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 31 [2022-12-14 13:59:01,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:59:01,415 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2022-12-14 13:59:01,415 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) [2022-12-14 13:59:01,415 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2022-12-14 13:59:01,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-12-14 13:59:01,416 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:59:01,416 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1, 1] [2022-12-14 13:59:01,420 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-12-14 13:59:01,616 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:59:01,617 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:59:01,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:59:01,618 INFO L85 PathProgramCache]: Analyzing trace with hash 994514938, now seen corresponding path program 9 times [2022-12-14 13:59:01,618 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:59:01,619 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [803096666] [2022-12-14 13:59:01,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:59:01,619 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:59:01,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:59:02,071 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 51 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:02,071 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:59:02,071 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [803096666] [2022-12-14 13:59:02,072 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [803096666] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:59:02,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [10774559] [2022-12-14 13:59:02,072 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:59:02,072 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:59:02,072 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:59:02,073 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:59:02,074 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-12-14 13:59:02,108 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:59:02,108 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:59:02,109 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 40 conjunts are in the unsatisfiable core [2022-12-14 13:59:02,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:59:02,392 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:02,392 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:59:03,079 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:03,079 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [10774559] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:59:03,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2100950270] [2022-12-14 13:59:03,080 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 13:59:03,080 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:59:03,080 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:59:03,080 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:59:03,080 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:59:03,145 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:59:03,488 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 [2022-12-14 13:59:03,488 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:59:03,488 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:59:03,488 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 48 [2022-12-14 13:59:03,488 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1665224218] [2022-12-14 13:59:03,489 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:59:03,489 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-12-14 13:59:03,489 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:59:03,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-12-14 13:59:03,491 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=372, Invalid=2490, Unknown=0, NotChecked=0, Total=2862 [2022-12-14 13:59:03,491 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) [2022-12-14 13:59:05,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:59:05,165 INFO L93 Difference]: Finished difference Result 102 states and 113 transitions. [2022-12-14 13:59:05,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-12-14 13:59:05,165 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 [2022-12-14 13:59:05,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:59:05,165 INFO L225 Difference]: With dead ends: 102 [2022-12-14 13:59:05,165 INFO L226 Difference]: Without dead ends: 73 [2022-12-14 13:59:05,167 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2033 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1055, Invalid=6955, Unknown=0, NotChecked=0, Total=8010 [2022-12-14 13:59:05,167 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 132 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 819 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 905 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 819 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 13:59:05,167 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [132 Valid, 98 Invalid, 905 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 819 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 13:59:05,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-12-14 13:59:05,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 40. [2022-12-14 13:59:05,185 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) [2022-12-14 13:59:05,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2022-12-14 13:59:05,185 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 35 [2022-12-14 13:59:05,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:59:05,185 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2022-12-14 13:59:05,185 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) [2022-12-14 13:59:05,185 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2022-12-14 13:59:05,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-12-14 13:59:05,186 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:59:05,186 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 1, 1, 1, 1, 1] [2022-12-14 13:59:05,190 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-12-14 13:59:05,386 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-12-14 13:59:05,387 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:59:05,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:59:05,388 INFO L85 PathProgramCache]: Analyzing trace with hash -1887470012, now seen corresponding path program 10 times [2022-12-14 13:59:05,388 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:59:05,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [213760985] [2022-12-14 13:59:05,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:59:05,389 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:59:05,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:59:05,960 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 70 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:05,960 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:59:05,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [213760985] [2022-12-14 13:59:05,960 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [213760985] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:59:05,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [548837133] [2022-12-14 13:59:05,960 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:59:05,960 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:59:05,960 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:59:05,961 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:59:05,962 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-12-14 13:59:06,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:59:06,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 44 conjunts are in the unsatisfiable core [2022-12-14 13:59:06,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:59:06,341 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:06,342 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:59:07,189 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:07,189 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [548837133] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:59:07,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [104915996] [2022-12-14 13:59:07,190 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 13:59:07,190 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:59:07,190 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:59:07,190 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:59:07,190 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:59:07,257 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:59:07,678 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 [2022-12-14 13:59:07,678 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:59:07,678 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:59:07,678 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 53 [2022-12-14 13:59:07,678 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1480493644] [2022-12-14 13:59:07,679 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:59:07,679 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-12-14 13:59:07,679 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:59:07,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-12-14 13:59:07,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=444, Invalid=2978, Unknown=0, NotChecked=0, Total=3422 [2022-12-14 13:59:07,680 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) [2022-12-14 13:59:09,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:59:09,984 INFO L93 Difference]: Finished difference Result 110 states and 123 transitions. [2022-12-14 13:59:09,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-12-14 13:59:09,985 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 [2022-12-14 13:59:09,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:59:09,986 INFO L225 Difference]: With dead ends: 110 [2022-12-14 13:59:09,986 INFO L226 Difference]: Without dead ends: 78 [2022-12-14 13:59:09,988 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2483 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=1271, Invalid=8431, Unknown=0, NotChecked=0, Total=9702 [2022-12-14 13:59:09,989 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 146 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 982 mSolverCounterSat, 105 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 1087 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 105 IncrementalHoareTripleChecker+Valid, 982 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 13:59:09,989 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 119 Invalid, 1087 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [105 Valid, 982 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 13:59:09,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-12-14 13:59:10,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 53. [2022-12-14 13:59:10,026 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) [2022-12-14 13:59:10,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 63 transitions. [2022-12-14 13:59:10,026 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 63 transitions. Word has length 39 [2022-12-14 13:59:10,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:59:10,026 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 63 transitions. [2022-12-14 13:59:10,027 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) [2022-12-14 13:59:10,027 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 63 transitions. [2022-12-14 13:59:10,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-12-14 13:59:10,027 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:59:10,027 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 1, 1, 1, 1, 1] [2022-12-14 13:59:10,032 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-12-14 13:59:10,228 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-12-14 13:59:10,228 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:59:10,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:59:10,229 INFO L85 PathProgramCache]: Analyzing trace with hash -1574171718, now seen corresponding path program 11 times [2022-12-14 13:59:10,229 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:59:10,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [895749051] [2022-12-14 13:59:10,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:59:10,229 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:59:10,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:59:10,877 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 92 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:10,877 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:59:10,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [895749051] [2022-12-14 13:59:10,877 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [895749051] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:59:10,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [76812333] [2022-12-14 13:59:10,877 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:59:10,877 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:59:10,877 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:59:10,878 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:59:10,879 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-12-14 13:59:10,924 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-12-14 13:59:10,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:59:10,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 44 conjunts are in the unsatisfiable core [2022-12-14 13:59:10,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:59:11,583 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:11,584 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:59:12,816 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:12,816 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [76812333] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:59:12,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [865727118] [2022-12-14 13:59:12,817 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 13:59:12,817 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:59:12,817 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:59:12,817 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:59:12,818 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:59:12,887 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:59:13,439 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 [2022-12-14 13:59:13,439 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:59:13,439 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:59:13,439 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 26, 26] total 72 [2022-12-14 13:59:13,439 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759629723] [2022-12-14 13:59:13,439 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:59:13,439 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2022-12-14 13:59:13,439 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:59:13,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2022-12-14 13:59:13,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=665, Invalid=5341, Unknown=0, NotChecked=0, Total=6006 [2022-12-14 13:59:13,440 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) [2022-12-14 13:59:15,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:59:15,208 INFO L93 Difference]: Finished difference Result 91 states and 102 transitions. [2022-12-14 13:59:15,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-12-14 13:59:15,208 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 [2022-12-14 13:59:15,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:59:15,209 INFO L225 Difference]: With dead ends: 91 [2022-12-14 13:59:15,209 INFO L226 Difference]: Without dead ends: 56 [2022-12-14 13:59:15,210 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2715 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=1183, Invalid=9119, Unknown=0, NotChecked=0, Total=10302 [2022-12-14 13:59:15,210 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 61 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 651 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 734 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 651 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 13:59:15,210 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 50 Invalid, 734 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 651 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 13:59:15,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-12-14 13:59:15,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 53. [2022-12-14 13:59:15,238 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) [2022-12-14 13:59:15,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 62 transitions. [2022-12-14 13:59:15,239 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 62 transitions. Word has length 43 [2022-12-14 13:59:15,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:59:15,239 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 62 transitions. [2022-12-14 13:59:15,239 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) [2022-12-14 13:59:15,239 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 62 transitions. [2022-12-14 13:59:15,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-12-14 13:59:15,239 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:59:15,239 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 9, 9, 1, 1, 1, 1, 1] [2022-12-14 13:59:15,244 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-12-14 13:59:15,440 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-12-14 13:59:15,441 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:59:15,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:59:15,442 INFO L85 PathProgramCache]: Analyzing trace with hash -1857533990, now seen corresponding path program 12 times [2022-12-14 13:59:15,442 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:59:15,442 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1288909166] [2022-12-14 13:59:15,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:59:15,443 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:59:15,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:59:15,756 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 45 proven. 147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:15,757 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:59:15,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1288909166] [2022-12-14 13:59:15,757 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1288909166] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:59:15,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1139698141] [2022-12-14 13:59:15,757 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:59:15,757 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:59:15,757 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:59:15,758 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:59:15,758 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-12-14 13:59:15,799 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:59:15,799 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:59:15,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 39 conjunts are in the unsatisfiable core [2022-12-14 13:59:15,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:59:16,045 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 0 proven. 192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:16,045 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:59:16,302 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 0 proven. 192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:16,302 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1139698141] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:59:16,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2128386185] [2022-12-14 13:59:16,303 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 13:59:16,303 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:59:16,303 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:59:16,303 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:59:16,303 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:59:16,373 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:59:16,708 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 [2022-12-14 13:59:16,708 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:59:16,708 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:59:16,708 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2022-12-14 13:59:16,708 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [909486851] [2022-12-14 13:59:16,708 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:59:16,708 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-12-14 13:59:16,709 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:59:16,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-12-14 13:59:16,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=394, Invalid=2362, Unknown=0, NotChecked=0, Total=2756 [2022-12-14 13:59:16,710 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) [2022-12-14 13:59:17,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:59:17,164 INFO L93 Difference]: Finished difference Result 90 states and 100 transitions. [2022-12-14 13:59:17,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-12-14 13:59:17,164 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 [2022-12-14 13:59:17,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:59:17,164 INFO L225 Difference]: With dead ends: 90 [2022-12-14 13:59:17,164 INFO L226 Difference]: Without dead ends: 88 [2022-12-14 13:59:17,165 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 93 SyntacticMatches, 10 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1721 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=907, Invalid=4643, Unknown=0, NotChecked=0, Total=5550 [2022-12-14 13:59:17,165 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 144 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 349 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 144 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 412 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 349 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 13:59:17,166 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [144 Valid, 43 Invalid, 412 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 349 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 13:59:17,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-12-14 13:59:17,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 48. [2022-12-14 13:59:17,192 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) [2022-12-14 13:59:17,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2022-12-14 13:59:17,192 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 44 [2022-12-14 13:59:17,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:59:17,193 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2022-12-14 13:59:17,193 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) [2022-12-14 13:59:17,193 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2022-12-14 13:59:17,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-12-14 13:59:17,193 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:59:17,193 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 1, 1, 1, 1, 1] [2022-12-14 13:59:17,198 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-12-14 13:59:17,394 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-12-14 13:59:17,395 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:59:17,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:59:17,396 INFO L85 PathProgramCache]: Analyzing trace with hash -1431629180, now seen corresponding path program 13 times [2022-12-14 13:59:17,396 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:59:17,397 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [378743234] [2022-12-14 13:59:17,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:59:17,397 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:59:17,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:59:17,991 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 117 proven. 104 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:17,991 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:59:17,991 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [378743234] [2022-12-14 13:59:17,991 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [378743234] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:59:17,991 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [362021276] [2022-12-14 13:59:17,991 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:59:17,991 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:59:17,991 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:59:17,992 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:59:17,993 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-12-14 13:59:18,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:59:18,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 52 conjunts are in the unsatisfiable core [2022-12-14 13:59:18,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:59:18,517 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:18,517 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:59:19,617 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:19,617 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [362021276] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:59:19,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1945388750] [2022-12-14 13:59:19,618 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 13:59:19,618 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:59:19,618 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:59:19,618 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:59:19,618 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:59:19,680 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:59:20,128 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 [2022-12-14 13:59:20,128 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:59:20,128 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:59:20,128 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26] total 63 [2022-12-14 13:59:20,128 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [215725698] [2022-12-14 13:59:20,128 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:59:20,128 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2022-12-14 13:59:20,128 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:59:20,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2022-12-14 13:59:20,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=609, Invalid=4083, Unknown=0, NotChecked=0, Total=4692 [2022-12-14 13:59:20,129 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) [2022-12-14 13:59:23,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:59:23,357 INFO L93 Difference]: Finished difference Result 132 states and 147 transitions. [2022-12-14 13:59:23,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-12-14 13:59:23,358 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 [2022-12-14 13:59:23,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:59:23,358 INFO L225 Difference]: With dead ends: 132 [2022-12-14 13:59:23,358 INFO L226 Difference]: Without dead ends: 94 [2022-12-14 13:59:23,359 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3515 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=1766, Invalid=11806, Unknown=0, NotChecked=0, Total=13572 [2022-12-14 13:59:23,359 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 184 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 1395 mSolverCounterSat, 150 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 184 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 1545 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 150 IncrementalHoareTripleChecker+Valid, 1395 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 13:59:23,360 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [184 Valid, 160 Invalid, 1545 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [150 Valid, 1395 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 13:59:23,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-12-14 13:59:23,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 63. [2022-12-14 13:59:23,406 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) [2022-12-14 13:59:23,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 75 transitions. [2022-12-14 13:59:23,406 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 75 transitions. Word has length 47 [2022-12-14 13:59:23,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:59:23,406 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 75 transitions. [2022-12-14 13:59:23,406 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) [2022-12-14 13:59:23,406 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 75 transitions. [2022-12-14 13:59:23,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-12-14 13:59:23,407 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:59:23,407 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 1, 1, 1, 1, 1] [2022-12-14 13:59:23,411 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-12-14 13:59:23,607 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-12-14 13:59:23,608 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:59:23,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:59:23,609 INFO L85 PathProgramCache]: Analyzing trace with hash -1237897350, now seen corresponding path program 14 times [2022-12-14 13:59:23,609 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:59:23,610 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1233577667] [2022-12-14 13:59:23,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:59:23,610 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:59:23,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:59:24,293 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 145 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:24,293 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:59:24,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1233577667] [2022-12-14 13:59:24,294 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1233577667] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:59:24,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1454909960] [2022-12-14 13:59:24,294 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:59:24,294 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:59:24,294 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:59:24,295 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:59:24,295 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-12-14 13:59:24,343 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-12-14 13:59:24,343 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:59:24,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 50 conjunts are in the unsatisfiable core [2022-12-14 13:59:24,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:59:25,221 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 265 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:25,222 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:59:26,702 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 265 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:26,702 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1454909960] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:59:26,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [374797469] [2022-12-14 13:59:26,704 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 13:59:26,704 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:59:26,704 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:59:26,704 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:59:26,704 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:59:26,757 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:59:27,208 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 [2022-12-14 13:59:27,208 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:59:27,208 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:59:27,208 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 30, 30] total 84 [2022-12-14 13:59:27,208 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143159508] [2022-12-14 13:59:27,208 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:59:27,209 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2022-12-14 13:59:27,209 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:59:27,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2022-12-14 13:59:27,210 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=879, Invalid=7131, Unknown=0, NotChecked=0, Total=8010 [2022-12-14 13:59:27,210 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) [2022-12-14 13:59:29,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:59:29,920 INFO L93 Difference]: Finished difference Result 107 states and 120 transitions. [2022-12-14 13:59:29,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-12-14 13:59:29,921 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 [2022-12-14 13:59:29,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:59:29,922 INFO L225 Difference]: With dead ends: 107 [2022-12-14 13:59:29,922 INFO L226 Difference]: Without dead ends: 66 [2022-12-14 13:59:29,922 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3649 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=1565, Invalid=12241, Unknown=0, NotChecked=0, Total=13806 [2022-12-14 13:59:29,923 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 88 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 1198 mSolverCounterSat, 103 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 1301 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 1198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 13:59:29,923 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 71 Invalid, 1301 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 1198 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 13:59:29,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-12-14 13:59:29,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 63. [2022-12-14 13:59:29,972 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) [2022-12-14 13:59:29,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 74 transitions. [2022-12-14 13:59:29,972 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 74 transitions. Word has length 51 [2022-12-14 13:59:29,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:59:29,972 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 74 transitions. [2022-12-14 13:59:29,972 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) [2022-12-14 13:59:29,972 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 74 transitions. [2022-12-14 13:59:29,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-12-14 13:59:29,973 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:59:29,973 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 11, 11, 1, 1, 1, 1, 1] [2022-12-14 13:59:29,977 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-12-14 13:59:30,173 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-12-14 13:59:30,173 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:59:30,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:59:30,174 INFO L85 PathProgramCache]: Analyzing trace with hash 1541753754, now seen corresponding path program 15 times [2022-12-14 13:59:30,174 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:59:30,174 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1150424110] [2022-12-14 13:59:30,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:59:30,174 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:59:30,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:59:30,539 INFO L134 CoverageAnalysis]: Checked inductivity of 278 backedges. 66 proven. 212 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:30,539 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:59:30,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1150424110] [2022-12-14 13:59:30,539 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1150424110] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:59:30,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1863870710] [2022-12-14 13:59:30,539 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:59:30,539 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:59:30,539 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:59:30,540 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:59:30,541 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-12-14 13:59:30,585 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:59:30,585 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:59:30,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 45 conjunts are in the unsatisfiable core [2022-12-14 13:59:30,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:59:30,912 INFO L134 CoverageAnalysis]: Checked inductivity of 278 backedges. 0 proven. 278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:30,912 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:59:31,242 INFO L134 CoverageAnalysis]: Checked inductivity of 278 backedges. 0 proven. 278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:31,243 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1863870710] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:59:31,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1948514560] [2022-12-14 13:59:31,243 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 13:59:31,243 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:59:31,244 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:59:31,244 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:59:31,244 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:59:31,302 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:59:31,704 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 [2022-12-14 13:59:31,705 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:59:31,705 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:59:31,705 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2022-12-14 13:59:31,705 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [333982310] [2022-12-14 13:59:31,705 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:59:31,705 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-12-14 13:59:31,705 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:59:31,706 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-12-14 13:59:31,706 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=525, Invalid=3135, Unknown=0, NotChecked=0, Total=3660 [2022-12-14 13:59:31,706 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) [2022-12-14 13:59:32,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:59:32,372 INFO L93 Difference]: Finished difference Result 106 states and 118 transitions. [2022-12-14 13:59:32,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-12-14 13:59:32,372 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 [2022-12-14 13:59:32,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:59:32,372 INFO L225 Difference]: With dead ends: 106 [2022-12-14 13:59:32,372 INFO L226 Difference]: Without dead ends: 104 [2022-12-14 13:59:32,373 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 111 SyntacticMatches, 12 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2375 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1223, Invalid=6259, Unknown=0, NotChecked=0, Total=7482 [2022-12-14 13:59:32,373 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 150 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 474 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 542 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 474 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 13:59:32,373 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [150 Valid, 55 Invalid, 542 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 474 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 13:59:32,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2022-12-14 13:59:32,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 56. [2022-12-14 13:59:32,411 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) [2022-12-14 13:59:32,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2022-12-14 13:59:32,412 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 52 [2022-12-14 13:59:32,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:59:32,412 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2022-12-14 13:59:32,412 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) [2022-12-14 13:59:32,412 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2022-12-14 13:59:32,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-12-14 13:59:32,412 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:59:32,412 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 12, 12, 1, 1, 1, 1, 1] [2022-12-14 13:59:32,417 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-12-14 13:59:32,613 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:59:32,613 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:59:32,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:59:32,614 INFO L85 PathProgramCache]: Analyzing trace with hash 10647236, now seen corresponding path program 16 times [2022-12-14 13:59:32,614 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:59:32,615 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [36434414] [2022-12-14 13:59:32,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:59:32,615 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:59:32,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:59:33,476 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 176 proven. 137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:33,477 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:59:33,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [36434414] [2022-12-14 13:59:33,477 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [36434414] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:59:33,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [92094115] [2022-12-14 13:59:33,477 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:59:33,477 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:59:33,477 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:59:33,478 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:59:33,479 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-12-14 13:59:33,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:59:33,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 60 conjunts are in the unsatisfiable core [2022-12-14 13:59:33,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:59:34,136 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 0 proven. 313 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:34,136 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:59:35,703 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 0 proven. 313 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:35,704 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [92094115] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:59:35,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [498837164] [2022-12-14 13:59:35,705 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 13:59:35,705 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:59:35,705 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:59:35,705 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:59:35,705 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:59:35,760 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:59:36,229 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 [2022-12-14 13:59:36,229 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:59:36,229 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:59:36,229 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 73 [2022-12-14 13:59:36,229 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044376199] [2022-12-14 13:59:36,229 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:59:36,230 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2022-12-14 13:59:36,230 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:59:36,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2022-12-14 13:59:36,230 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=802, Invalid=5360, Unknown=0, NotChecked=0, Total=6162 [2022-12-14 13:59:36,231 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) [2022-12-14 13:59:40,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:59:40,555 INFO L93 Difference]: Finished difference Result 154 states and 171 transitions. [2022-12-14 13:59:40,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2022-12-14 13:59:40,556 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 [2022-12-14 13:59:40,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:59:40,556 INFO L225 Difference]: With dead ends: 154 [2022-12-14 13:59:40,556 INFO L226 Difference]: Without dead ends: 110 [2022-12-14 13:59:40,557 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4723 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=2345, Invalid=15745, Unknown=0, NotChecked=0, Total=18090 [2022-12-14 13:59:40,557 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 232 mSDsluCounter, 205 mSDsCounter, 0 mSdLazyCounter, 1803 mSolverCounterSat, 203 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 232 SdHoareTripleChecker+Valid, 208 SdHoareTripleChecker+Invalid, 2006 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 203 IncrementalHoareTripleChecker+Valid, 1803 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-12-14 13:59:40,558 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [232 Valid, 208 Invalid, 2006 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [203 Valid, 1803 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-12-14 13:59:40,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-12-14 13:59:40,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 73. [2022-12-14 13:59:40,628 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) [2022-12-14 13:59:40,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 87 transitions. [2022-12-14 13:59:40,628 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 87 transitions. Word has length 55 [2022-12-14 13:59:40,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:59:40,628 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 87 transitions. [2022-12-14 13:59:40,629 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) [2022-12-14 13:59:40,629 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 87 transitions. [2022-12-14 13:59:40,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-12-14 13:59:40,629 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:59:40,629 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 13, 13, 1, 1, 1, 1, 1] [2022-12-14 13:59:40,633 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2022-12-14 13:59:40,830 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:59:40,830 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:59:40,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:59:40,831 INFO L85 PathProgramCache]: Analyzing trace with hash -1308327110, now seen corresponding path program 17 times [2022-12-14 13:59:40,831 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:59:40,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2107612225] [2022-12-14 13:59:40,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:59:40,832 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:59:40,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:59:41,922 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 210 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:41,922 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:59:41,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2107612225] [2022-12-14 13:59:41,922 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2107612225] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:59:41,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2062516384] [2022-12-14 13:59:41,923 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 13:59:41,923 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:59:41,923 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:59:41,924 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:59:41,924 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-12-14 13:59:41,985 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2022-12-14 13:59:41,985 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:59:41,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 56 conjunts are in the unsatisfiable core [2022-12-14 13:59:41,988 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:59:43,134 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:43,134 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:59:45,214 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:45,214 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2062516384] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:59:45,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1471896368] [2022-12-14 13:59:45,215 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 13:59:45,215 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:59:45,215 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:59:45,215 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:59:45,215 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:59:45,273 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:59:45,819 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 [2022-12-14 13:59:45,819 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:59:45,819 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:59:45,819 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 34, 34] total 96 [2022-12-14 13:59:45,819 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1445475036] [2022-12-14 13:59:45,819 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:59:45,819 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2022-12-14 13:59:45,819 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:59:45,820 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2022-12-14 13:59:45,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1125, Invalid=9177, Unknown=0, NotChecked=0, Total=10302 [2022-12-14 13:59:45,821 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) [2022-12-14 13:59:49,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:59:49,357 INFO L93 Difference]: Finished difference Result 123 states and 138 transitions. [2022-12-14 13:59:49,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-12-14 13:59:49,358 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 [2022-12-14 13:59:49,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:59:49,358 INFO L225 Difference]: With dead ends: 123 [2022-12-14 13:59:49,358 INFO L226 Difference]: Without dead ends: 76 [2022-12-14 13:59:49,359 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4719 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=2003, Invalid=15819, Unknown=0, NotChecked=0, Total=17822 [2022-12-14 13:59:49,359 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 91 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 1277 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 1399 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 1277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 13:59:49,359 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [91 Valid, 73 Invalid, 1399 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 1277 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 13:59:49,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2022-12-14 13:59:49,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 73. [2022-12-14 13:59:49,426 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) [2022-12-14 13:59:49,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 86 transitions. [2022-12-14 13:59:49,426 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 86 transitions. Word has length 59 [2022-12-14 13:59:49,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:59:49,426 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 86 transitions. [2022-12-14 13:59:49,426 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) [2022-12-14 13:59:49,426 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 86 transitions. [2022-12-14 13:59:49,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-12-14 13:59:49,427 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:59:49,427 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 13, 13, 1, 1, 1, 1, 1] [2022-12-14 13:59:49,431 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2022-12-14 13:59:49,627 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-12-14 13:59:49,628 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:59:49,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:59:49,629 INFO L85 PathProgramCache]: Analyzing trace with hash -832274598, now seen corresponding path program 18 times [2022-12-14 13:59:49,629 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:59:49,629 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [230036127] [2022-12-14 13:59:49,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:59:49,630 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:59:49,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:59:50,117 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 91 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:50,117 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:59:50,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [230036127] [2022-12-14 13:59:50,117 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [230036127] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:59:50,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1116161590] [2022-12-14 13:59:50,117 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 13:59:50,118 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:59:50,118 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:59:50,118 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:59:50,119 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-12-14 13:59:50,171 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 13:59:50,171 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 13:59:50,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 51 conjunts are in the unsatisfiable core [2022-12-14 13:59:50,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:59:50,501 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:50,501 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:59:51,017 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:51,017 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1116161590] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:59:51,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1488236128] [2022-12-14 13:59:51,018 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 13:59:51,018 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:59:51,018 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:59:51,018 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:59:51,018 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:59:51,070 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:59:51,450 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 [2022-12-14 13:59:51,450 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:59:51,451 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:59:51,451 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2022-12-14 13:59:51,451 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837936310] [2022-12-14 13:59:51,451 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:59:51,451 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2022-12-14 13:59:51,451 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:59:51,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2022-12-14 13:59:51,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=676, Invalid=4016, Unknown=0, NotChecked=0, Total=4692 [2022-12-14 13:59:51,452 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) [2022-12-14 13:59:52,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 13:59:52,387 INFO L93 Difference]: Finished difference Result 122 states and 136 transitions. [2022-12-14 13:59:52,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-12-14 13:59:52,387 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 [2022-12-14 13:59:52,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 13:59:52,388 INFO L225 Difference]: With dead ends: 122 [2022-12-14 13:59:52,388 INFO L226 Difference]: Without dead ends: 120 [2022-12-14 13:59:52,389 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 129 SyntacticMatches, 14 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3133 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1587, Invalid=8115, Unknown=0, NotChecked=0, Total=9702 [2022-12-14 13:59:52,389 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 152 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 604 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 687 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 604 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 13:59:52,389 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [152 Valid, 57 Invalid, 687 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 604 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 13:59:52,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2022-12-14 13:59:52,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 64. [2022-12-14 13:59:52,443 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) [2022-12-14 13:59:52,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2022-12-14 13:59:52,443 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 60 [2022-12-14 13:59:52,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 13:59:52,443 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2022-12-14 13:59:52,443 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) [2022-12-14 13:59:52,444 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2022-12-14 13:59:52,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-12-14 13:59:52,444 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 13:59:52,444 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 14, 14, 1, 1, 1, 1, 1] [2022-12-14 13:59:52,448 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2022-12-14 13:59:52,645 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-12-14 13:59:52,646 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 13:59:52,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 13:59:52,646 INFO L85 PathProgramCache]: Analyzing trace with hash 558476036, now seen corresponding path program 19 times [2022-12-14 13:59:52,647 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 13:59:52,647 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [289501256] [2022-12-14 13:59:52,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 13:59:52,647 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 13:59:52,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:59:53,696 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 247 proven. 174 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:53,697 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 13:59:53,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [289501256] [2022-12-14 13:59:53,697 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [289501256] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 13:59:53,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1691218880] [2022-12-14 13:59:53,697 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 13:59:53,697 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 13:59:53,697 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 13:59:53,698 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 13:59:53,698 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-12-14 13:59:53,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 13:59:53,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 68 conjunts are in the unsatisfiable core [2022-12-14 13:59:53,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 13:59:54,397 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:54,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 13:59:56,055 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 13:59:56,055 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1691218880] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 13:59:56,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [645599320] [2022-12-14 13:59:56,056 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 13:59:56,056 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 13:59:56,056 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 13:59:56,056 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 13:59:56,056 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 13:59:56,128 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 13:59:56,634 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 [2022-12-14 13:59:56,635 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 13:59:56,635 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 13:59:56,635 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 34] total 83 [2022-12-14 13:59:56,635 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1358023804] [2022-12-14 13:59:56,635 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 13:59:56,636 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2022-12-14 13:59:56,636 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 13:59:56,637 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2022-12-14 13:59:56,637 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1023, Invalid=6809, Unknown=0, NotChecked=0, Total=7832 [2022-12-14 13:59:56,637 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) [2022-12-14 14:00:02,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:00:02,549 INFO L93 Difference]: Finished difference Result 176 states and 195 transitions. [2022-12-14 14:00:02,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2022-12-14 14:00:02,549 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 [2022-12-14 14:00:02,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:00:02,550 INFO L225 Difference]: With dead ends: 176 [2022-12-14 14:00:02,550 INFO L226 Difference]: Without dead ends: 126 [2022-12-14 14:00:02,551 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6107 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=3008, Invalid=20248, Unknown=0, NotChecked=0, Total=23256 [2022-12-14 14:00:02,551 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 283 mSDsluCounter, 274 mSDsCounter, 0 mSdLazyCounter, 2395 mSolverCounterSat, 263 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 283 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 2658 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 263 IncrementalHoareTripleChecker+Valid, 2395 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-12-14 14:00:02,551 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [283 Valid, 277 Invalid, 2658 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [263 Valid, 2395 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-12-14 14:00:02,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2022-12-14 14:00:02,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 83. [2022-12-14 14:00:02,638 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) [2022-12-14 14:00:02,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 99 transitions. [2022-12-14 14:00:02,638 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 99 transitions. Word has length 63 [2022-12-14 14:00:02,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:00:02,638 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 99 transitions. [2022-12-14 14:00:02,639 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) [2022-12-14 14:00:02,639 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 99 transitions. [2022-12-14 14:00:02,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-12-14 14:00:02,641 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:00:02,641 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 15, 15, 1, 1, 1, 1, 1] [2022-12-14 14:00:02,645 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-12-14 14:00:02,842 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:00:02,843 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:00:02,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:00:02,844 INFO L85 PathProgramCache]: Analyzing trace with hash 1798309626, now seen corresponding path program 20 times [2022-12-14 14:00:02,844 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:00:02,845 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [788428676] [2022-12-14 14:00:02,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:00:02,845 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:00:02,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:00:04,115 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 287 proven. 194 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:00:04,115 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:00:04,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [788428676] [2022-12-14 14:00:04,115 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [788428676] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:00:04,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [72552489] [2022-12-14 14:00:04,115 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 14:00:04,115 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:00:04,115 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:00:04,116 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:00:04,117 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-12-14 14:00:04,173 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2022-12-14 14:00:04,173 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:00:04,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 62 conjunts are in the unsatisfiable core [2022-12-14 14:00:04,176 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:00:05,583 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:00:05,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:00:07,951 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:00:07,951 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [72552489] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:00:07,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [983204646] [2022-12-14 14:00:07,952 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:00:07,952 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:00:07,952 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:00:07,952 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:00:07,952 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:00:08,005 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:00:08,557 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 [2022-12-14 14:00:08,557 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:00:08,557 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:00:08,557 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 38, 38] total 108 [2022-12-14 14:00:08,557 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779050245] [2022-12-14 14:00:08,557 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:00:08,558 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 108 states [2022-12-14 14:00:08,558 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:00:08,558 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2022-12-14 14:00:08,559 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1403, Invalid=11479, Unknown=0, NotChecked=0, Total=12882 [2022-12-14 14:00:08,559 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) [2022-12-14 14:00:13,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:00:13,201 INFO L93 Difference]: Finished difference Result 139 states and 156 transitions. [2022-12-14 14:00:13,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-12-14 14:00:13,201 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 [2022-12-14 14:00:13,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:00:13,201 INFO L225 Difference]: With dead ends: 139 [2022-12-14 14:00:13,202 INFO L226 Difference]: Without dead ends: 86 [2022-12-14 14:00:13,202 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5925 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=2497, Invalid=19853, Unknown=0, NotChecked=0, Total=22350 [2022-12-14 14:00:13,203 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 94 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 1523 mSolverCounterSat, 155 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 1678 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 155 IncrementalHoareTripleChecker+Valid, 1523 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 14:00:13,203 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [94 Valid, 78 Invalid, 1678 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [155 Valid, 1523 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 14:00:13,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-12-14 14:00:13,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 83. [2022-12-14 14:00:13,295 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) [2022-12-14 14:00:13,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 98 transitions. [2022-12-14 14:00:13,296 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 98 transitions. Word has length 67 [2022-12-14 14:00:13,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:00:13,296 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 98 transitions. [2022-12-14 14:00:13,296 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) [2022-12-14 14:00:13,296 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 98 transitions. [2022-12-14 14:00:13,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-12-14 14:00:13,296 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:00:13,296 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 15, 15, 1, 1, 1, 1, 1] [2022-12-14 14:00:13,300 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2022-12-14 14:00:13,497 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-12-14 14:00:13,498 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:00:13,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:00:13,498 INFO L85 PathProgramCache]: Analyzing trace with hash -1637752038, now seen corresponding path program 21 times [2022-12-14 14:00:13,499 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:00:13,499 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1169092876] [2022-12-14 14:00:13,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:00:13,500 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:00:13,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:00:14,041 INFO L134 CoverageAnalysis]: Checked inductivity of 498 backedges. 120 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:00:14,041 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:00:14,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1169092876] [2022-12-14 14:00:14,041 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1169092876] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:00:14,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1710585524] [2022-12-14 14:00:14,041 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 14:00:14,042 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:00:14,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:00:14,042 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:00:14,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-12-14 14:00:14,094 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 14:00:14,095 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:00:14,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 57 conjunts are in the unsatisfiable core [2022-12-14 14:00:14,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:00:14,652 INFO L134 CoverageAnalysis]: Checked inductivity of 498 backedges. 0 proven. 498 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:00:14,652 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:00:15,336 INFO L134 CoverageAnalysis]: Checked inductivity of 498 backedges. 0 proven. 498 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:00:15,336 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1710585524] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:00:15,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [450200986] [2022-12-14 14:00:15,337 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:00:15,337 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:00:15,337 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:00:15,337 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:00:15,337 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:00:15,400 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:00:15,848 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 [2022-12-14 14:00:15,848 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:00:15,848 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:00:15,849 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 71 [2022-12-14 14:00:15,849 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200193849] [2022-12-14 14:00:15,849 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:00:15,849 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2022-12-14 14:00:15,849 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:00:15,850 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2022-12-14 14:00:15,850 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=847, Invalid=5005, Unknown=0, NotChecked=0, Total=5852 [2022-12-14 14:00:15,850 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) [2022-12-14 14:00:17,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:00:17,069 INFO L93 Difference]: Finished difference Result 138 states and 154 transitions. [2022-12-14 14:00:17,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-12-14 14:00:17,070 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 [2022-12-14 14:00:17,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:00:17,070 INFO L225 Difference]: With dead ends: 138 [2022-12-14 14:00:17,070 INFO L226 Difference]: Without dead ends: 136 [2022-12-14 14:00:17,071 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 147 SyntacticMatches, 16 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3995 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1999, Invalid=10211, Unknown=0, NotChecked=0, Total=12210 [2022-12-14 14:00:17,071 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 207 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 679 mSolverCounterSat, 110 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 789 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 110 IncrementalHoareTripleChecker+Valid, 679 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 14:00:17,071 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [207 Valid, 56 Invalid, 789 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [110 Valid, 679 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 14:00:17,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2022-12-14 14:00:17,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 72. [2022-12-14 14:00:17,144 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) [2022-12-14 14:00:17,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2022-12-14 14:00:17,144 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 68 [2022-12-14 14:00:17,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:00:17,145 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2022-12-14 14:00:17,145 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) [2022-12-14 14:00:17,145 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2022-12-14 14:00:17,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-12-14 14:00:17,145 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:00:17,145 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 16, 16, 1, 1, 1, 1, 1] [2022-12-14 14:00:17,149 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2022-12-14 14:00:17,346 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-12-14 14:00:17,346 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:00:17,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:00:17,347 INFO L85 PathProgramCache]: Analyzing trace with hash 562343748, now seen corresponding path program 22 times [2022-12-14 14:00:17,348 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:00:17,348 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [707913067] [2022-12-14 14:00:17,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:00:17,349 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:00:17,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:00:18,814 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 330 proven. 215 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:00:18,814 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:00:18,814 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [707913067] [2022-12-14 14:00:18,814 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [707913067] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:00:18,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2053208693] [2022-12-14 14:00:18,815 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 14:00:18,815 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:00:18,815 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:00:18,815 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:00:18,816 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-12-14 14:00:18,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:00:18,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 284 conjuncts, 76 conjunts are in the unsatisfiable core [2022-12-14 14:00:18,881 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:00:19,588 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 0 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:00:19,588 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:00:21,602 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 0 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:00:21,602 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2053208693] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:00:21,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [977735910] [2022-12-14 14:00:21,603 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:00:21,603 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:00:21,603 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:00:21,603 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:00:21,603 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:00:21,672 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:00:22,200 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 [2022-12-14 14:00:22,200 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:00:22,200 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:00:22,200 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 93 [2022-12-14 14:00:22,200 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [684345693] [2022-12-14 14:00:22,200 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:00:22,200 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2022-12-14 14:00:22,201 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:00:22,201 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2022-12-14 14:00:22,201 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1272, Invalid=8430, Unknown=0, NotChecked=0, Total=9702 [2022-12-14 14:00:22,202 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) [2022-12-14 14:00:29,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:00:29,688 INFO L93 Difference]: Finished difference Result 198 states and 219 transitions. [2022-12-14 14:00:29,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2022-12-14 14:00:29,689 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 [2022-12-14 14:00:29,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:00:29,689 INFO L225 Difference]: With dead ends: 198 [2022-12-14 14:00:29,689 INFO L226 Difference]: Without dead ends: 142 [2022-12-14 14:00:29,691 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7667 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=3755, Invalid=25315, Unknown=0, NotChecked=0, Total=29070 [2022-12-14 14:00:29,691 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 331 mSDsluCounter, 346 mSDsCounter, 0 mSdLazyCounter, 3163 mSolverCounterSat, 332 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 331 SdHoareTripleChecker+Valid, 349 SdHoareTripleChecker+Invalid, 3495 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 332 IncrementalHoareTripleChecker+Valid, 3163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-12-14 14:00:29,691 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [331 Valid, 349 Invalid, 3495 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [332 Valid, 3163 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-12-14 14:00:29,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2022-12-14 14:00:29,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 93. [2022-12-14 14:00:29,809 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) [2022-12-14 14:00:29,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 111 transitions. [2022-12-14 14:00:29,809 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 111 transitions. Word has length 71 [2022-12-14 14:00:29,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:00:29,809 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 111 transitions. [2022-12-14 14:00:29,809 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) [2022-12-14 14:00:29,809 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 111 transitions. [2022-12-14 14:00:29,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-12-14 14:00:29,810 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:00:29,810 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 17, 17, 1, 1, 1, 1, 1] [2022-12-14 14:00:29,814 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2022-12-14 14:00:30,010 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-12-14 14:00:30,011 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:00:30,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:00:30,012 INFO L85 PathProgramCache]: Analyzing trace with hash 307608250, now seen corresponding path program 23 times [2022-12-14 14:00:30,012 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:00:30,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [333287500] [2022-12-14 14:00:30,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:00:30,013 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:00:30,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:00:31,333 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 376 proven. 237 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:00:31,333 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:00:31,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [333287500] [2022-12-14 14:00:31,333 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [333287500] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:00:31,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [129622833] [2022-12-14 14:00:31,333 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 14:00:31,334 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:00:31,334 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:00:31,334 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:00:31,335 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-12-14 14:00:31,397 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2022-12-14 14:00:31,397 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:00:31,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 68 conjunts are in the unsatisfiable core [2022-12-14 14:00:31,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:00:33,026 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 0 proven. 613 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:00:33,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:00:35,829 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 0 proven. 613 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:00:35,829 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [129622833] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:00:35,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1623663229] [2022-12-14 14:00:35,830 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:00:35,830 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:00:35,830 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:00:35,830 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:00:35,830 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:00:35,888 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:00:36,443 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 [2022-12-14 14:00:36,443 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:00:36,443 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:00:36,443 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 42, 42] total 120 [2022-12-14 14:00:36,443 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605164656] [2022-12-14 14:00:36,443 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:00:36,444 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 120 states [2022-12-14 14:00:36,444 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:00:36,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 120 interpolants. [2022-12-14 14:00:36,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1713, Invalid=14037, Unknown=0, NotChecked=0, Total=15750 [2022-12-14 14:00:36,445 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) [2022-12-14 14:00:42,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:00:42,947 INFO L93 Difference]: Finished difference Result 155 states and 174 transitions. [2022-12-14 14:00:42,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-12-14 14:00:42,947 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 [2022-12-14 14:00:42,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:00:42,948 INFO L225 Difference]: With dead ends: 155 [2022-12-14 14:00:42,948 INFO L226 Difference]: Without dead ends: 96 [2022-12-14 14:00:42,949 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7267 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=3047, Invalid=24343, Unknown=0, NotChecked=0, Total=27390 [2022-12-14 14:00:42,949 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 103 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 2303 mSolverCounterSat, 192 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 2495 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 192 IncrementalHoareTripleChecker+Valid, 2303 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-12-14 14:00:42,949 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 98 Invalid, 2495 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [192 Valid, 2303 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-12-14 14:00:42,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-12-14 14:00:43,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 93. [2022-12-14 14:00:43,068 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) [2022-12-14 14:00:43,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 110 transitions. [2022-12-14 14:00:43,069 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 110 transitions. Word has length 75 [2022-12-14 14:00:43,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:00:43,069 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 110 transitions. [2022-12-14 14:00:43,069 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) [2022-12-14 14:00:43,069 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 110 transitions. [2022-12-14 14:00:43,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-12-14 14:00:43,069 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:00:43,069 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 17, 17, 1, 1, 1, 1, 1] [2022-12-14 14:00:43,074 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-12-14 14:00:43,270 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-12-14 14:00:43,271 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:00:43,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:00:43,272 INFO L85 PathProgramCache]: Analyzing trace with hash -596019494, now seen corresponding path program 24 times [2022-12-14 14:00:43,272 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:00:43,272 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [338961879] [2022-12-14 14:00:43,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:00:43,273 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:00:43,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:00:44,041 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 153 proven. 479 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:00:44,042 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:00:44,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [338961879] [2022-12-14 14:00:44,042 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [338961879] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:00:44,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [54696530] [2022-12-14 14:00:44,042 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 14:00:44,042 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:00:44,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:00:44,043 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:00:44,044 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-12-14 14:00:44,093 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 14:00:44,093 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:00:44,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 63 conjunts are in the unsatisfiable core [2022-12-14 14:00:44,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:00:44,553 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 0 proven. 632 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:00:44,553 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:00:45,183 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 0 proven. 632 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:00:45,183 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [54696530] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:00:45,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1316036431] [2022-12-14 14:00:45,184 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:00:45,184 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:00:45,184 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:00:45,185 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:00:45,185 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:00:45,246 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:00:45,714 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 [2022-12-14 14:00:45,714 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:00:45,715 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:00:45,715 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 79 [2022-12-14 14:00:45,715 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239401952] [2022-12-14 14:00:45,715 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:00:45,715 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2022-12-14 14:00:45,715 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:00:45,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2022-12-14 14:00:45,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1038, Invalid=6102, Unknown=0, NotChecked=0, Total=7140 [2022-12-14 14:00:45,716 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) [2022-12-14 14:00:46,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:00:46,844 INFO L93 Difference]: Finished difference Result 154 states and 172 transitions. [2022-12-14 14:00:46,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-12-14 14:00:46,844 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 [2022-12-14 14:00:46,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:00:46,845 INFO L225 Difference]: With dead ends: 154 [2022-12-14 14:00:46,845 INFO L226 Difference]: Without dead ends: 152 [2022-12-14 14:00:46,845 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 165 SyntacticMatches, 18 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4961 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2459, Invalid=12547, Unknown=0, NotChecked=0, Total=15006 [2022-12-14 14:00:46,846 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 251 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 804 mSolverCounterSat, 146 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 251 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 950 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 146 IncrementalHoareTripleChecker+Valid, 804 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 14:00:46,846 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [251 Valid, 69 Invalid, 950 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [146 Valid, 804 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 14:00:46,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2022-12-14 14:00:46,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 80. [2022-12-14 14:00:46,935 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) [2022-12-14 14:00:46,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 81 transitions. [2022-12-14 14:00:46,936 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 81 transitions. Word has length 76 [2022-12-14 14:00:46,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:00:46,936 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 81 transitions. [2022-12-14 14:00:46,936 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) [2022-12-14 14:00:46,936 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 81 transitions. [2022-12-14 14:00:46,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-12-14 14:00:46,936 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:00:46,936 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 18, 18, 1, 1, 1, 1, 1] [2022-12-14 14:00:46,941 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-12-14 14:00:47,137 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-12-14 14:00:47,138 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:00:47,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:00:47,138 INFO L85 PathProgramCache]: Analyzing trace with hash -617118844, now seen corresponding path program 25 times [2022-12-14 14:00:47,139 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:00:47,139 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [807218681] [2022-12-14 14:00:47,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:00:47,139 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:00:47,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:00:48,740 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 425 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:00:48,740 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:00:48,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [807218681] [2022-12-14 14:00:48,740 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [807218681] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:00:48,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1573736916] [2022-12-14 14:00:48,740 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 14:00:48,740 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:00:48,740 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:00:48,741 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:00:48,742 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-12-14 14:00:48,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:00:48,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 84 conjunts are in the unsatisfiable core [2022-12-14 14:00:48,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:00:49,789 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 0 proven. 685 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:00:49,789 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:00:52,185 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 0 proven. 685 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:00:52,186 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1573736916] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:00:52,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1977028423] [2022-12-14 14:00:52,186 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:00:52,187 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:00:52,187 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:00:52,187 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:00:52,187 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:00:52,243 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:00:52,747 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 [2022-12-14 14:00:52,748 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:00:52,748 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:00:52,748 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 103 [2022-12-14 14:00:52,748 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601431102] [2022-12-14 14:00:52,748 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:00:52,748 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2022-12-14 14:00:52,748 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:00:52,749 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2022-12-14 14:00:52,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1549, Invalid=10223, Unknown=0, NotChecked=0, Total=11772 [2022-12-14 14:00:52,749 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) [2022-12-14 14:01:01,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:01:01,487 INFO L93 Difference]: Finished difference Result 220 states and 243 transitions. [2022-12-14 14:01:01,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2022-12-14 14:01:01,488 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 [2022-12-14 14:01:01,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:01:01,488 INFO L225 Difference]: With dead ends: 220 [2022-12-14 14:01:01,488 INFO L226 Difference]: Without dead ends: 158 [2022-12-14 14:01:01,490 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 358 GetRequests, 171 SyntacticMatches, 0 SemanticMatches, 187 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9403 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=4586, Invalid=30946, Unknown=0, NotChecked=0, Total=35532 [2022-12-14 14:01:01,490 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 391 mSDsluCounter, 417 mSDsCounter, 0 mSdLazyCounter, 3647 mSolverCounterSat, 409 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 391 SdHoareTripleChecker+Valid, 420 SdHoareTripleChecker+Invalid, 4056 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 409 IncrementalHoareTripleChecker+Valid, 3647 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-12-14 14:01:01,490 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [391 Valid, 420 Invalid, 4056 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [409 Valid, 3647 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-12-14 14:01:01,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2022-12-14 14:01:01,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 103. [2022-12-14 14:01:01,641 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) [2022-12-14 14:01:01,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 123 transitions. [2022-12-14 14:01:01,642 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 123 transitions. Word has length 79 [2022-12-14 14:01:01,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:01:01,642 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 123 transitions. [2022-12-14 14:01:01,642 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) [2022-12-14 14:01:01,642 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 123 transitions. [2022-12-14 14:01:01,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-12-14 14:01:01,642 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:01:01,642 INFO L195 NwaCegarLoop]: trace histogram [20, 20, 19, 19, 1, 1, 1, 1, 1] [2022-12-14 14:01:01,647 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2022-12-14 14:01:01,843 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-12-14 14:01:01,844 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:01:01,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:01:01,844 INFO L85 PathProgramCache]: Analyzing trace with hash -216949126, now seen corresponding path program 26 times [2022-12-14 14:01:01,845 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:01:01,845 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [953358054] [2022-12-14 14:01:01,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:01:01,845 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:01:01,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:01:03,323 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 477 proven. 284 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:01:03,323 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:01:03,323 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [953358054] [2022-12-14 14:01:03,323 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [953358054] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:01:03,323 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [123474354] [2022-12-14 14:01:03,323 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 14:01:03,323 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:01:03,323 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:01:03,324 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:01:03,325 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-12-14 14:01:03,419 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2022-12-14 14:01:03,419 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:01:03,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 80 conjunts are in the unsatisfiable core [2022-12-14 14:01:03,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:01:05,767 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 0 proven. 761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:01:05,767 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:01:09,569 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 0 proven. 761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:01:09,569 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [123474354] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:01:09,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [350675807] [2022-12-14 14:01:09,570 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:01:09,570 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:01:09,570 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:01:09,570 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:01:09,570 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:01:09,620 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:01:10,283 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 [2022-12-14 14:01:10,283 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:01:10,283 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:01:10,283 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 48, 48] total 136 [2022-12-14 14:01:10,283 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1484681593] [2022-12-14 14:01:10,283 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:01:10,284 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 136 states [2022-12-14 14:01:10,284 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:01:10,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 136 interpolants. [2022-12-14 14:01:10,286 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2166, Invalid=17856, Unknown=0, NotChecked=0, Total=20022 [2022-12-14 14:01:10,286 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) [2022-12-14 14:01:17,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:01:17,465 INFO L93 Difference]: Finished difference Result 171 states and 192 transitions. [2022-12-14 14:01:17,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-12-14 14:01:17,466 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 [2022-12-14 14:01:17,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:01:17,466 INFO L225 Difference]: With dead ends: 171 [2022-12-14 14:01:17,466 INFO L226 Difference]: Without dead ends: 106 [2022-12-14 14:01:17,468 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9507 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=3848, Invalid=30934, Unknown=0, NotChecked=0, Total=34782 [2022-12-14 14:01:17,468 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 138 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 2163 mSolverCounterSat, 254 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 2417 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 254 IncrementalHoareTripleChecker+Valid, 2163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:01:17,468 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [138 Valid, 84 Invalid, 2417 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [254 Valid, 2163 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-12-14 14:01:17,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-12-14 14:01:17,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 103. [2022-12-14 14:01:17,620 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) [2022-12-14 14:01:17,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 122 transitions. [2022-12-14 14:01:17,620 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 122 transitions. Word has length 83 [2022-12-14 14:01:17,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:01:17,620 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 122 transitions. [2022-12-14 14:01:17,620 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) [2022-12-14 14:01:17,620 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 122 transitions. [2022-12-14 14:01:17,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-12-14 14:01:17,621 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:01:17,621 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 19, 19, 1, 1, 1, 1, 1] [2022-12-14 14:01:17,625 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2022-12-14 14:01:17,821 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:01:17,822 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:01:17,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:01:17,823 INFO L85 PathProgramCache]: Analyzing trace with hash -1270400358, now seen corresponding path program 27 times [2022-12-14 14:01:17,823 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:01:17,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [150316945] [2022-12-14 14:01:17,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:01:17,824 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:01:17,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:01:18,589 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 190 proven. 592 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:01:18,589 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:01:18,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [150316945] [2022-12-14 14:01:18,589 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [150316945] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:01:18,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2064796519] [2022-12-14 14:01:18,589 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 14:01:18,590 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:01:18,590 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:01:18,590 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:01:18,591 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-12-14 14:01:18,648 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 14:01:18,648 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:01:18,650 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 69 conjunts are in the unsatisfiable core [2022-12-14 14:01:18,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:01:19,384 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 0 proven. 782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:01:19,384 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:01:20,276 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 0 proven. 782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:01:20,276 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2064796519] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:01:20,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [207494033] [2022-12-14 14:01:20,277 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:01:20,277 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:01:20,277 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:01:20,277 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:01:20,277 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:01:20,342 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:01:20,771 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 [2022-12-14 14:01:20,771 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:01:20,771 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:01:20,771 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 87 [2022-12-14 14:01:20,771 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569764062] [2022-12-14 14:01:20,772 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:01:20,772 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2022-12-14 14:01:20,772 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:01:20,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2022-12-14 14:01:20,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1249, Invalid=7307, Unknown=0, NotChecked=0, Total=8556 [2022-12-14 14:01:20,773 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) [2022-12-14 14:01:22,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:01:22,239 INFO L93 Difference]: Finished difference Result 170 states and 190 transitions. [2022-12-14 14:01:22,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-12-14 14:01:22,240 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 [2022-12-14 14:01:22,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:01:22,240 INFO L225 Difference]: With dead ends: 170 [2022-12-14 14:01:22,240 INFO L226 Difference]: Without dead ends: 168 [2022-12-14 14:01:22,241 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 183 SyntacticMatches, 20 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6031 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2967, Invalid=15123, Unknown=0, NotChecked=0, Total=18090 [2022-12-14 14:01:22,241 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 246 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 942 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 246 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 1063 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 942 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 14:01:22,241 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [246 Valid, 70 Invalid, 1063 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 942 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 14:01:22,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-12-14 14:01:22,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 88. [2022-12-14 14:01:22,357 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) [2022-12-14 14:01:22,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2022-12-14 14:01:22,357 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 84 [2022-12-14 14:01:22,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:01:22,358 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2022-12-14 14:01:22,358 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) [2022-12-14 14:01:22,358 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2022-12-14 14:01:22,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-12-14 14:01:22,358 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:01:22,358 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 20, 20, 1, 1, 1, 1, 1] [2022-12-14 14:01:22,363 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-12-14 14:01:22,559 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:01:22,559 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:01:22,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:01:22,560 INFO L85 PathProgramCache]: Analyzing trace with hash 759572420, now seen corresponding path program 28 times [2022-12-14 14:01:22,560 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:01:22,560 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [977904784] [2022-12-14 14:01:22,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:01:22,560 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:01:22,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:01:24,445 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 532 proven. 309 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:01:24,445 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:01:24,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [977904784] [2022-12-14 14:01:24,445 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [977904784] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:01:24,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [795897690] [2022-12-14 14:01:24,446 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 14:01:24,446 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:01:24,446 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:01:24,446 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:01:24,447 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-12-14 14:01:24,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:01:24,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 344 conjuncts, 92 conjunts are in the unsatisfiable core [2022-12-14 14:01:24,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:01:25,576 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:01:25,576 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:01:28,565 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:01:28,565 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [795897690] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:01:28,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [253150573] [2022-12-14 14:01:28,566 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:01:28,566 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:01:28,566 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:01:28,566 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:01:28,566 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:01:28,624 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:01:29,305 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 [2022-12-14 14:01:29,305 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:01:29,305 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:01:29,305 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 46] total 113 [2022-12-14 14:01:29,305 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1175257156] [2022-12-14 14:01:29,306 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:01:29,306 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2022-12-14 14:01:29,306 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:01:29,307 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2022-12-14 14:01:29,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1854, Invalid=12188, Unknown=0, NotChecked=0, Total=14042 [2022-12-14 14:01:29,307 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) [2022-12-14 14:01:41,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:01:41,351 INFO L93 Difference]: Finished difference Result 242 states and 267 transitions. [2022-12-14 14:01:41,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2022-12-14 14:01:41,351 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 [2022-12-14 14:01:41,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:01:41,352 INFO L225 Difference]: With dead ends: 242 [2022-12-14 14:01:41,352 INFO L226 Difference]: Without dead ends: 174 [2022-12-14 14:01:41,353 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 394 GetRequests, 189 SyntacticMatches, 0 SemanticMatches, 205 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11315 ImplicationChecksByTransitivity, 14.2s TimeCoverageRelationStatistics Valid=5501, Invalid=37141, Unknown=0, NotChecked=0, Total=42642 [2022-12-14 14:01:41,354 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 446 mSDsluCounter, 497 mSDsCounter, 0 mSdLazyCounter, 4312 mSolverCounterSat, 493 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 446 SdHoareTripleChecker+Valid, 500 SdHoareTripleChecker+Invalid, 4805 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 493 IncrementalHoareTripleChecker+Valid, 4312 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-12-14 14:01:41,354 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [446 Valid, 500 Invalid, 4805 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [493 Valid, 4312 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2022-12-14 14:01:41,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2022-12-14 14:01:41,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 113. [2022-12-14 14:01:41,551 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) [2022-12-14 14:01:41,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 135 transitions. [2022-12-14 14:01:41,552 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 135 transitions. Word has length 87 [2022-12-14 14:01:41,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:01:41,552 INFO L495 AbstractCegarLoop]: Abstraction has 113 states and 135 transitions. [2022-12-14 14:01:41,552 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) [2022-12-14 14:01:41,552 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 135 transitions. [2022-12-14 14:01:41,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-12-14 14:01:41,552 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:01:41,553 INFO L195 NwaCegarLoop]: trace histogram [22, 22, 21, 21, 1, 1, 1, 1, 1] [2022-12-14 14:01:41,557 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-12-14 14:01:41,753 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2022-12-14 14:01:41,754 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:01:41,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:01:41,755 INFO L85 PathProgramCache]: Analyzing trace with hash 872395322, now seen corresponding path program 29 times [2022-12-14 14:01:41,755 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:01:41,755 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1551237457] [2022-12-14 14:01:41,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:01:41,756 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:01:41,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:01:43,683 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 590 proven. 335 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:01:43,684 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:01:43,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1551237457] [2022-12-14 14:01:43,684 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1551237457] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:01:43,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1234130633] [2022-12-14 14:01:43,684 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 14:01:43,684 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:01:43,684 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:01:43,685 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:01:43,685 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-12-14 14:01:43,771 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2022-12-14 14:01:43,771 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:01:43,773 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 80 conjunts are in the unsatisfiable core [2022-12-14 14:01:43,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:01:46,116 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 0 proven. 925 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:01:46,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:01:50,172 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 0 proven. 925 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:01:50,172 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1234130633] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:01:50,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1589367019] [2022-12-14 14:01:50,173 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:01:50,173 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:01:50,173 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:01:50,173 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:01:50,174 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:01:50,230 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:01:50,937 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 [2022-12-14 14:01:50,937 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:01:50,937 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:01:50,937 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 50, 50] total 144 [2022-12-14 14:01:50,937 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [556797575] [2022-12-14 14:01:50,937 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:01:50,938 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 144 states [2022-12-14 14:01:50,938 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:01:50,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 144 interpolants. [2022-12-14 14:01:50,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2429, Invalid=19921, Unknown=0, NotChecked=0, Total=22350 [2022-12-14 14:01:50,939 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) [2022-12-14 14:01:59,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:01:59,623 INFO L93 Difference]: Finished difference Result 187 states and 210 transitions. [2022-12-14 14:01:59,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2022-12-14 14:01:59,623 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 [2022-12-14 14:01:59,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:01:59,624 INFO L225 Difference]: With dead ends: 187 [2022-12-14 14:01:59,624 INFO L226 Difference]: Without dead ends: 116 [2022-12-14 14:01:59,625 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10359 ImplicationChecksByTransitivity, 14.6s TimeCoverageRelationStatistics Valid=4315, Invalid=34691, Unknown=0, NotChecked=0, Total=39006 [2022-12-14 14:01:59,626 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 141 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 2236 mSolverCounterSat, 337 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 141 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 2573 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 337 IncrementalHoareTripleChecker+Valid, 2236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-12-14 14:01:59,626 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [141 Valid, 84 Invalid, 2573 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [337 Valid, 2236 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-12-14 14:01:59,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2022-12-14 14:01:59,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 113. [2022-12-14 14:01:59,823 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) [2022-12-14 14:01:59,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 134 transitions. [2022-12-14 14:01:59,823 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 134 transitions. Word has length 91 [2022-12-14 14:01:59,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:01:59,823 INFO L495 AbstractCegarLoop]: Abstraction has 113 states and 134 transitions. [2022-12-14 14:01:59,823 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) [2022-12-14 14:01:59,824 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 134 transitions. [2022-12-14 14:01:59,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-12-14 14:01:59,824 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:01:59,824 INFO L195 NwaCegarLoop]: trace histogram [23, 22, 21, 21, 1, 1, 1, 1, 1] [2022-12-14 14:01:59,828 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2022-12-14 14:02:00,024 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2022-12-14 14:02:00,025 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:02:00,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:02:00,026 INFO L85 PathProgramCache]: Analyzing trace with hash 744959578, now seen corresponding path program 30 times [2022-12-14 14:02:00,026 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:02:00,026 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [801624675] [2022-12-14 14:02:00,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:02:00,027 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:02:00,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:02:01,041 INFO L134 CoverageAnalysis]: Checked inductivity of 948 backedges. 231 proven. 717 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:02:01,041 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:02:01,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [801624675] [2022-12-14 14:02:01,041 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [801624675] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:02:01,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1422870534] [2022-12-14 14:02:01,041 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 14:02:01,041 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:02:01,041 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:02:01,042 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:02:01,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-12-14 14:02:01,115 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 14:02:01,115 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:02:01,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 75 conjunts are in the unsatisfiable core [2022-12-14 14:02:01,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:02:01,901 INFO L134 CoverageAnalysis]: Checked inductivity of 948 backedges. 0 proven. 948 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:02:01,901 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:02:02,726 INFO L134 CoverageAnalysis]: Checked inductivity of 948 backedges. 0 proven. 948 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:02:02,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1422870534] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:02:02,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [671974158] [2022-12-14 14:02:02,727 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:02:02,727 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:02:02,728 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:02:02,728 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:02:02,728 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:02:02,791 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:02:03,175 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 [2022-12-14 14:02:03,176 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:02:03,176 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:02:03,176 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 95 [2022-12-14 14:02:03,176 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1722308079] [2022-12-14 14:02:03,176 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:02:03,176 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 95 states [2022-12-14 14:02:03,176 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:02:03,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2022-12-14 14:02:03,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1480, Invalid=8620, Unknown=0, NotChecked=0, Total=10100 [2022-12-14 14:02:03,178 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) [2022-12-14 14:02:04,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:02:04,884 INFO L93 Difference]: Finished difference Result 186 states and 208 transitions. [2022-12-14 14:02:04,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-12-14 14:02:04,885 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 [2022-12-14 14:02:04,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:02:04,885 INFO L225 Difference]: With dead ends: 186 [2022-12-14 14:02:04,885 INFO L226 Difference]: Without dead ends: 184 [2022-12-14 14:02:04,886 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 201 SyntacticMatches, 22 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7205 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=3523, Invalid=17939, Unknown=0, NotChecked=0, Total=21462 [2022-12-14 14:02:04,887 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 272 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 1057 mSolverCounterSat, 141 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 272 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 1198 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 141 IncrementalHoareTripleChecker+Valid, 1057 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 14:02:04,887 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [272 Valid, 73 Invalid, 1198 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [141 Valid, 1057 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 14:02:04,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2022-12-14 14:02:05,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 96. [2022-12-14 14:02:05,033 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) [2022-12-14 14:02:05,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 97 transitions. [2022-12-14 14:02:05,033 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 97 transitions. Word has length 92 [2022-12-14 14:02:05,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:02:05,033 INFO L495 AbstractCegarLoop]: Abstraction has 96 states and 97 transitions. [2022-12-14 14:02:05,033 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) [2022-12-14 14:02:05,033 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 97 transitions. [2022-12-14 14:02:05,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-12-14 14:02:05,034 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:02:05,034 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 22, 22, 1, 1, 1, 1, 1] [2022-12-14 14:02:05,038 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2022-12-14 14:02:05,234 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:02:05,235 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:02:05,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:02:05,236 INFO L85 PathProgramCache]: Analyzing trace with hash 999595012, now seen corresponding path program 31 times [2022-12-14 14:02:05,236 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:02:05,236 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [306717900] [2022-12-14 14:02:05,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:02:05,237 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:02:05,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:02:07,414 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 651 proven. 362 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:02:07,414 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:02:07,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [306717900] [2022-12-14 14:02:07,414 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [306717900] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:02:07,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1909437176] [2022-12-14 14:02:07,414 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 14:02:07,414 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:02:07,414 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:02:07,415 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:02:07,416 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-12-14 14:02:07,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:02:07,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 100 conjunts are in the unsatisfiable core [2022-12-14 14:02:07,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:02:09,037 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 0 proven. 1013 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:02:09,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:02:12,556 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 0 proven. 1013 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:02:12,556 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1909437176] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:02:12,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [664940336] [2022-12-14 14:02:12,557 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:02:12,557 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:02:12,557 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:02:12,557 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:02:12,557 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:02:12,610 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:02:13,220 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 [2022-12-14 14:02:13,220 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:02:13,220 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:02:13,221 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50, 50] total 123 [2022-12-14 14:02:13,221 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882003577] [2022-12-14 14:02:13,221 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:02:13,221 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2022-12-14 14:02:13,221 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:02:13,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2022-12-14 14:02:13,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2187, Invalid=14325, Unknown=0, NotChecked=0, Total=16512 [2022-12-14 14:02:13,223 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) [2022-12-14 14:02:27,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:02:27,815 INFO L93 Difference]: Finished difference Result 264 states and 291 transitions. [2022-12-14 14:02:27,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2022-12-14 14:02:27,816 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 [2022-12-14 14:02:27,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:02:27,816 INFO L225 Difference]: With dead ends: 264 [2022-12-14 14:02:27,817 INFO L226 Difference]: Without dead ends: 190 [2022-12-14 14:02:27,818 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 207 SyntacticMatches, 0 SemanticMatches, 223 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13403 ImplicationChecksByTransitivity, 17.2s TimeCoverageRelationStatistics Valid=6500, Invalid=43900, Unknown=0, NotChecked=0, Total=50400 [2022-12-14 14:02:27,819 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 512 mSDsluCounter, 592 mSDsCounter, 0 mSdLazyCounter, 5279 mSolverCounterSat, 586 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 512 SdHoareTripleChecker+Valid, 595 SdHoareTripleChecker+Invalid, 5865 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 586 IncrementalHoareTripleChecker+Valid, 5279 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-12-14 14:02:27,819 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [512 Valid, 595 Invalid, 5865 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [586 Valid, 5279 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2022-12-14 14:02:27,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2022-12-14 14:02:28,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 123. [2022-12-14 14:02:28,063 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) [2022-12-14 14:02:28,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 147 transitions. [2022-12-14 14:02:28,063 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 147 transitions. Word has length 95 [2022-12-14 14:02:28,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:02:28,063 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 147 transitions. [2022-12-14 14:02:28,063 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) [2022-12-14 14:02:28,064 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 147 transitions. [2022-12-14 14:02:28,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2022-12-14 14:02:28,064 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:02:28,064 INFO L195 NwaCegarLoop]: trace histogram [24, 24, 23, 23, 1, 1, 1, 1, 1] [2022-12-14 14:02:28,068 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2022-12-14 14:02:28,264 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-12-14 14:02:28,265 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:02:28,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:02:28,266 INFO L85 PathProgramCache]: Analyzing trace with hash -1766066694, now seen corresponding path program 32 times [2022-12-14 14:02:28,266 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:02:28,267 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [601864077] [2022-12-14 14:02:28,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:02:28,267 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:02:28,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:02:30,521 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 715 proven. 390 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:02:30,521 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:02:30,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [601864077] [2022-12-14 14:02:30,522 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [601864077] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:02:30,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [449125595] [2022-12-14 14:02:30,522 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 14:02:30,522 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:02:30,522 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:02:30,523 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:02:30,523 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-12-14 14:02:30,629 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2022-12-14 14:02:30,629 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:02:30,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 389 conjuncts, 92 conjunts are in the unsatisfiable core [2022-12-14 14:02:30,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:02:33,746 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 0 proven. 1105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:02:33,746 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:02:37,994 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 0 proven. 1105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:02:37,994 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [449125595] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:02:37,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1365800806] [2022-12-14 14:02:37,995 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:02:37,995 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:02:37,995 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:02:37,995 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:02:37,995 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:02:38,040 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:02:38,770 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 [2022-12-14 14:02:38,771 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:02:38,771 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:02:38,771 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 56, 56] total 160 [2022-12-14 14:02:38,771 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1100923754] [2022-12-14 14:02:38,771 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:02:38,772 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 160 states [2022-12-14 14:02:38,772 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:02:38,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 160 interpolants. [2022-12-14 14:02:38,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2962, Invalid=24428, Unknown=0, NotChecked=0, Total=27390 [2022-12-14 14:02:38,774 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) [2022-12-14 14:02:50,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:02:50,532 INFO L93 Difference]: Finished difference Result 203 states and 228 transitions. [2022-12-14 14:02:50,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2022-12-14 14:02:50,533 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 [2022-12-14 14:02:50,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:02:50,534 INFO L225 Difference]: With dead ends: 203 [2022-12-14 14:02:50,534 INFO L226 Difference]: Without dead ends: 126 [2022-12-14 14:02:50,536 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 401 GetRequests, 184 SyntacticMatches, 0 SemanticMatches, 217 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13007 ImplicationChecksByTransitivity, 18.0s TimeCoverageRelationStatistics Valid=5256, Invalid=42486, Unknown=0, NotChecked=0, Total=47742 [2022-12-14 14:02:50,536 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 161 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 3224 mSolverCounterSat, 395 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 3619 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 395 IncrementalHoareTripleChecker+Valid, 3224 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-12-14 14:02:50,536 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [161 Valid, 104 Invalid, 3619 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [395 Valid, 3224 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-12-14 14:02:50,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2022-12-14 14:02:50,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 123. [2022-12-14 14:02:50,791 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) [2022-12-14 14:02:50,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 146 transitions. [2022-12-14 14:02:50,791 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 146 transitions. Word has length 99 [2022-12-14 14:02:50,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:02:50,791 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 146 transitions. [2022-12-14 14:02:50,791 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) [2022-12-14 14:02:50,795 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 146 transitions. [2022-12-14 14:02:50,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2022-12-14 14:02:50,795 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:02:50,795 INFO L195 NwaCegarLoop]: trace histogram [25, 24, 23, 23, 1, 1, 1, 1, 1] [2022-12-14 14:02:50,799 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2022-12-14 14:02:50,996 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-12-14 14:02:50,996 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:02:50,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:02:50,997 INFO L85 PathProgramCache]: Analyzing trace with hash -428518886, now seen corresponding path program 33 times [2022-12-14 14:02:50,997 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:02:50,998 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1712408588] [2022-12-14 14:02:50,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:02:50,998 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:02:51,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:02:52,253 INFO L134 CoverageAnalysis]: Checked inductivity of 1130 backedges. 276 proven. 854 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:02:52,253 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:02:52,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1712408588] [2022-12-14 14:02:52,253 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1712408588] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:02:52,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [810262057] [2022-12-14 14:02:52,253 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 14:02:52,253 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:02:52,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:02:52,254 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:02:52,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-12-14 14:02:52,340 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 14:02:52,340 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:02:52,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 81 conjunts are in the unsatisfiable core [2022-12-14 14:02:52,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:02:53,045 INFO L134 CoverageAnalysis]: Checked inductivity of 1130 backedges. 0 proven. 1130 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:02:53,046 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:02:53,970 INFO L134 CoverageAnalysis]: Checked inductivity of 1130 backedges. 0 proven. 1130 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:02:53,970 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [810262057] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:02:53,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1647841026] [2022-12-14 14:02:53,971 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:02:53,971 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:02:53,971 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:02:53,971 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:02:53,971 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:02:54,039 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:02:54,487 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 [2022-12-14 14:02:54,488 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:02:54,488 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:02:54,488 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 103 [2022-12-14 14:02:54,488 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2020061833] [2022-12-14 14:02:54,488 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:02:54,488 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2022-12-14 14:02:54,488 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:02:54,489 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2022-12-14 14:02:54,489 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1731, Invalid=10041, Unknown=0, NotChecked=0, Total=11772 [2022-12-14 14:02:54,489 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) [2022-12-14 14:02:56,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:02:56,374 INFO L93 Difference]: Finished difference Result 202 states and 226 transitions. [2022-12-14 14:02:56,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2022-12-14 14:02:56,375 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 [2022-12-14 14:02:56,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:02:56,375 INFO L225 Difference]: With dead ends: 202 [2022-12-14 14:02:56,375 INFO L226 Difference]: Without dead ends: 200 [2022-12-14 14:02:56,376 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 219 SyntacticMatches, 24 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8483 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=4127, Invalid=20995, Unknown=0, NotChecked=0, Total=25122 [2022-12-14 14:02:56,377 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 337 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 1175 mSolverCounterSat, 185 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 337 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 1360 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 185 IncrementalHoareTripleChecker+Valid, 1175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 14:02:56,377 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [337 Valid, 73 Invalid, 1360 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [185 Valid, 1175 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 14:02:56,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2022-12-14 14:02:56,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 104. [2022-12-14 14:02:56,554 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) [2022-12-14 14:02:56,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 105 transitions. [2022-12-14 14:02:56,555 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 105 transitions. Word has length 100 [2022-12-14 14:02:56,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:02:56,555 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 105 transitions. [2022-12-14 14:02:56,555 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) [2022-12-14 14:02:56,555 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 105 transitions. [2022-12-14 14:02:56,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-12-14 14:02:56,555 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:02:56,555 INFO L195 NwaCegarLoop]: trace histogram [25, 25, 24, 24, 1, 1, 1, 1, 1] [2022-12-14 14:02:56,560 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-12-14 14:02:56,756 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-12-14 14:02:56,757 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:02:56,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:02:56,757 INFO L85 PathProgramCache]: Analyzing trace with hash -1358503868, now seen corresponding path program 34 times [2022-12-14 14:02:56,758 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:02:56,758 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1689631058] [2022-12-14 14:02:56,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:02:56,758 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:02:56,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:02:58,980 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 782 proven. 419 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:02:58,980 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:02:58,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1689631058] [2022-12-14 14:02:58,980 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1689631058] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:02:58,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [49531531] [2022-12-14 14:02:58,980 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 14:02:58,980 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:02:58,980 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:02:58,981 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:02:58,982 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-12-14 14:02:59,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:02:59,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 108 conjunts are in the unsatisfiable core [2022-12-14 14:02:59,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:03:00,478 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 0 proven. 1201 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:03:00,478 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:03:04,252 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 0 proven. 1201 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:03:04,252 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [49531531] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:03:04,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [662853371] [2022-12-14 14:03:04,252 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:03:04,252 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:03:04,253 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:03:04,253 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:03:04,253 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:03:04,305 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:03:04,919 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 [2022-12-14 14:03:04,919 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:03:04,919 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:03:04,919 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54, 54] total 133 [2022-12-14 14:03:04,919 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802186602] [2022-12-14 14:03:04,919 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:03:04,920 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 133 states [2022-12-14 14:03:04,920 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:03:04,920 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 133 interpolants. [2022-12-14 14:03:04,921 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2548, Invalid=16634, Unknown=0, NotChecked=0, Total=19182 [2022-12-14 14:03:04,921 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) [2022-12-14 14:03:21,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:03:21,384 INFO L93 Difference]: Finished difference Result 286 states and 315 transitions. [2022-12-14 14:03:21,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 134 states. [2022-12-14 14:03:21,384 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 [2022-12-14 14:03:21,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:03:21,385 INFO L225 Difference]: With dead ends: 286 [2022-12-14 14:03:21,385 INFO L226 Difference]: Without dead ends: 206 [2022-12-14 14:03:21,388 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 466 GetRequests, 225 SyntacticMatches, 0 SemanticMatches, 241 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15667 ImplicationChecksByTransitivity, 18.7s TimeCoverageRelationStatistics Valid=7583, Invalid=51223, Unknown=0, NotChecked=0, Total=58806 [2022-12-14 14:03:21,389 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 580 mSDsluCounter, 687 mSDsCounter, 0 mSdLazyCounter, 6106 mSolverCounterSat, 687 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 580 SdHoareTripleChecker+Valid, 690 SdHoareTripleChecker+Invalid, 6793 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 687 IncrementalHoareTripleChecker+Valid, 6106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2022-12-14 14:03:21,389 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [580 Valid, 690 Invalid, 6793 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [687 Valid, 6106 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2022-12-14 14:03:21,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2022-12-14 14:03:21,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 133. [2022-12-14 14:03:21,701 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) [2022-12-14 14:03:21,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 159 transitions. [2022-12-14 14:03:21,702 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 159 transitions. Word has length 103 [2022-12-14 14:03:21,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:03:21,702 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 159 transitions. [2022-12-14 14:03:21,702 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) [2022-12-14 14:03:21,702 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 159 transitions. [2022-12-14 14:03:21,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2022-12-14 14:03:21,702 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:03:21,703 INFO L195 NwaCegarLoop]: trace histogram [26, 26, 25, 25, 1, 1, 1, 1, 1] [2022-12-14 14:03:21,707 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2022-12-14 14:03:21,903 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-12-14 14:03:21,904 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:03:21,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:03:21,905 INFO L85 PathProgramCache]: Analyzing trace with hash 937585082, now seen corresponding path program 35 times [2022-12-14 14:03:21,905 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:03:21,906 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2122613769] [2022-12-14 14:03:21,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:03:21,907 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:03:21,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:03:24,730 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 852 proven. 449 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:03:24,730 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:03:24,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2122613769] [2022-12-14 14:03:24,731 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2122613769] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:03:24,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [371057837] [2022-12-14 14:03:24,731 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 14:03:24,731 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:03:24,731 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:03:24,731 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:03:24,732 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-12-14 14:03:24,828 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2022-12-14 14:03:24,828 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:03:24,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 419 conjuncts, 92 conjunts are in the unsatisfiable core [2022-12-14 14:03:24,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:03:28,039 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:03:28,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:03:33,025 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:03:33,025 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [371057837] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:03:33,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1369299140] [2022-12-14 14:03:33,026 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:03:33,026 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:03:33,026 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:03:33,026 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:03:33,026 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:03:33,096 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:03:33,833 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 [2022-12-14 14:03:33,833 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:03:33,833 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:03:33,833 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 58, 58] total 168 [2022-12-14 14:03:33,833 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44783354] [2022-12-14 14:03:33,833 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:03:33,834 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 168 states [2022-12-14 14:03:33,834 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:03:33,835 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 168 interpolants. [2022-12-14 14:03:33,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3273, Invalid=26829, Unknown=0, NotChecked=0, Total=30102 [2022-12-14 14:03:33,836 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) [2022-12-14 14:03:47,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:03:47,781 INFO L93 Difference]: Finished difference Result 219 states and 246 transitions. [2022-12-14 14:03:47,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-12-14 14:03:47,782 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 [2022-12-14 14:03:47,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:03:47,782 INFO L225 Difference]: With dead ends: 219 [2022-12-14 14:03:47,782 INFO L226 Difference]: Without dead ends: 136 [2022-12-14 14:03:47,785 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 432 GetRequests, 204 SyntacticMatches, 0 SemanticMatches, 228 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13995 ImplicationChecksByTransitivity, 21.1s TimeCoverageRelationStatistics Valid=5807, Invalid=46863, Unknown=0, NotChecked=0, Total=52670 [2022-12-14 14:03:47,785 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 168 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 3432 mSolverCounterSat, 404 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 168 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 3836 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 404 IncrementalHoareTripleChecker+Valid, 3432 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-12-14 14:03:47,785 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [168 Valid, 111 Invalid, 3836 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [404 Valid, 3432 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-12-14 14:03:47,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2022-12-14 14:03:48,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 133. [2022-12-14 14:03:48,085 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) [2022-12-14 14:03:48,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 158 transitions. [2022-12-14 14:03:48,086 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 158 transitions. Word has length 107 [2022-12-14 14:03:48,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:03:48,086 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 158 transitions. [2022-12-14 14:03:48,086 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) [2022-12-14 14:03:48,086 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 158 transitions. [2022-12-14 14:03:48,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2022-12-14 14:03:48,086 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:03:48,086 INFO L195 NwaCegarLoop]: trace histogram [27, 26, 25, 25, 1, 1, 1, 1, 1] [2022-12-14 14:03:48,091 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2022-12-14 14:03:48,287 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-12-14 14:03:48,288 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:03:48,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:03:48,288 INFO L85 PathProgramCache]: Analyzing trace with hash -552753702, now seen corresponding path program 36 times [2022-12-14 14:03:48,289 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:03:48,289 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1869637394] [2022-12-14 14:03:48,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:03:48,289 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:03:48,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:03:49,754 INFO L134 CoverageAnalysis]: Checked inductivity of 1328 backedges. 325 proven. 1003 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:03:49,754 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:03:49,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1869637394] [2022-12-14 14:03:49,754 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1869637394] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:03:49,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [228152264] [2022-12-14 14:03:49,754 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 14:03:49,754 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:03:49,754 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:03:49,755 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:03:49,756 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-12-14 14:03:49,826 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 14:03:49,826 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:03:49,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 87 conjunts are in the unsatisfiable core [2022-12-14 14:03:49,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:03:50,886 INFO L134 CoverageAnalysis]: Checked inductivity of 1328 backedges. 0 proven. 1328 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:03:50,886 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:03:52,392 INFO L134 CoverageAnalysis]: Checked inductivity of 1328 backedges. 0 proven. 1328 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:03:52,392 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [228152264] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:03:52,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1705383958] [2022-12-14 14:03:52,393 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:03:52,393 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:03:52,393 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:03:52,393 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:03:52,393 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:03:52,447 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:03:52,978 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 [2022-12-14 14:03:52,978 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:03:52,978 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:03:52,978 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 111 [2022-12-14 14:03:52,978 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234465966] [2022-12-14 14:03:52,978 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:03:52,978 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 111 states [2022-12-14 14:03:52,979 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:03:52,979 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2022-12-14 14:03:52,980 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2002, Invalid=11570, Unknown=0, NotChecked=0, Total=13572 [2022-12-14 14:03:52,980 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) [2022-12-14 14:03:55,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:03:55,540 INFO L93 Difference]: Finished difference Result 218 states and 244 transitions. [2022-12-14 14:03:55,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-12-14 14:03:55,541 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 [2022-12-14 14:03:55,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:03:55,542 INFO L225 Difference]: With dead ends: 218 [2022-12-14 14:03:55,542 INFO L226 Difference]: Without dead ends: 216 [2022-12-14 14:03:55,543 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 432 GetRequests, 237 SyntacticMatches, 26 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9865 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=4779, Invalid=24291, Unknown=0, NotChecked=0, Total=29070 [2022-12-14 14:03:55,543 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 362 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 1357 mSolverCounterSat, 191 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 362 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 1548 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 191 IncrementalHoareTripleChecker+Valid, 1357 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 14:03:55,543 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [362 Valid, 78 Invalid, 1548 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [191 Valid, 1357 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 14:03:55,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2022-12-14 14:03:55,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 112. [2022-12-14 14:03:55,757 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) [2022-12-14 14:03:55,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 113 transitions. [2022-12-14 14:03:55,758 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 113 transitions. Word has length 108 [2022-12-14 14:03:55,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:03:55,758 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 113 transitions. [2022-12-14 14:03:55,758 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) [2022-12-14 14:03:55,758 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 113 transitions. [2022-12-14 14:03:55,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2022-12-14 14:03:55,759 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:03:55,759 INFO L195 NwaCegarLoop]: trace histogram [27, 27, 26, 26, 1, 1, 1, 1, 1] [2022-12-14 14:03:55,763 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2022-12-14 14:03:55,959 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-12-14 14:03:55,960 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:03:55,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:03:55,961 INFO L85 PathProgramCache]: Analyzing trace with hash -176098172, now seen corresponding path program 37 times [2022-12-14 14:03:55,961 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:03:55,961 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1476412488] [2022-12-14 14:03:55,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:03:55,962 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:03:56,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:03:58,705 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 925 proven. 480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:03:58,706 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:03:58,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1476412488] [2022-12-14 14:03:58,706 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1476412488] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:03:58,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [400220575] [2022-12-14 14:03:58,706 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 14:03:58,706 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:03:58,706 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:03:58,707 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:03:58,708 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-12-14 14:03:58,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:03:58,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 434 conjuncts, 116 conjunts are in the unsatisfiable core [2022-12-14 14:03:58,775 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:04:00,582 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 0 proven. 1405 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:04:00,582 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:04:05,470 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 0 proven. 1405 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:04:05,470 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [400220575] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:04:05,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [653896914] [2022-12-14 14:04:05,471 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:04:05,471 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:04:05,472 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:04:05,472 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:04:05,472 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:04:05,525 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:04:06,423 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 [2022-12-14 14:04:06,423 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:04:06,423 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:04:06,424 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 58, 58] total 143 [2022-12-14 14:04:06,424 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510652274] [2022-12-14 14:04:06,424 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:04:06,424 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 143 states [2022-12-14 14:04:06,424 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:04:06,425 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2022-12-14 14:04:06,426 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2937, Invalid=19115, Unknown=0, NotChecked=0, Total=22052 [2022-12-14 14:04:06,426 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) [2022-12-14 14:04:26,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:04:26,822 INFO L93 Difference]: Finished difference Result 308 states and 339 transitions. [2022-12-14 14:04:26,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 144 states. [2022-12-14 14:04:26,823 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 [2022-12-14 14:04:26,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:04:26,823 INFO L225 Difference]: With dead ends: 308 [2022-12-14 14:04:26,823 INFO L226 Difference]: Without dead ends: 222 [2022-12-14 14:04:26,826 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 243 SyntacticMatches, 0 SemanticMatches, 259 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18107 ImplicationChecksByTransitivity, 23.8s TimeCoverageRelationStatistics Valid=8750, Invalid=59110, Unknown=0, NotChecked=0, Total=67860 [2022-12-14 14:04:26,826 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 649 mSDsluCounter, 799 mSDsCounter, 0 mSdLazyCounter, 6977 mSolverCounterSat, 795 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 649 SdHoareTripleChecker+Valid, 802 SdHoareTripleChecker+Invalid, 7772 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 795 IncrementalHoareTripleChecker+Valid, 6977 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2022-12-14 14:04:26,826 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [649 Valid, 802 Invalid, 7772 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [795 Valid, 6977 Invalid, 0 Unknown, 0 Unchecked, 3.5s Time] [2022-12-14 14:04:26,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2022-12-14 14:04:27,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 143. [2022-12-14 14:04:27,202 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) [2022-12-14 14:04:27,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 171 transitions. [2022-12-14 14:04:27,202 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 171 transitions. Word has length 111 [2022-12-14 14:04:27,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:04:27,202 INFO L495 AbstractCegarLoop]: Abstraction has 143 states and 171 transitions. [2022-12-14 14:04:27,202 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) [2022-12-14 14:04:27,202 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 171 transitions. [2022-12-14 14:04:27,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2022-12-14 14:04:27,203 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:04:27,203 INFO L195 NwaCegarLoop]: trace histogram [28, 28, 27, 27, 1, 1, 1, 1, 1] [2022-12-14 14:04:27,207 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Ended with exit code 0 [2022-12-14 14:04:27,403 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:04:27,404 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:04:27,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:04:27,405 INFO L85 PathProgramCache]: Analyzing trace with hash 1326386554, now seen corresponding path program 38 times [2022-12-14 14:04:27,405 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:04:27,405 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1745159251] [2022-12-14 14:04:27,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:04:27,406 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:04:27,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:04:30,490 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 1001 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:04:30,490 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:04:30,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1745159251] [2022-12-14 14:04:30,490 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1745159251] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:04:30,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1738985870] [2022-12-14 14:04:30,490 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 14:04:30,491 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:04:30,491 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:04:30,491 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:04:30,492 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-12-14 14:04:30,621 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2022-12-14 14:04:30,621 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:04:30,624 INFO L263 TraceCheckSpWp]: Trace formula consists of 449 conjuncts, 105 conjunts are in the unsatisfiable core [2022-12-14 14:04:30,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:04:34,962 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 0 proven. 1513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:04:34,962 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:04:41,683 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 0 proven. 1513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:04:41,683 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1738985870] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:04:41,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [536846065] [2022-12-14 14:04:41,684 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:04:41,684 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:04:41,684 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:04:41,684 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:04:41,684 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:04:41,741 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:04:42,547 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 [2022-12-14 14:04:42,548 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:04:42,548 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:04:42,548 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 64, 64] total 184 [2022-12-14 14:04:42,548 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [487345263] [2022-12-14 14:04:42,548 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:04:42,548 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 184 states [2022-12-14 14:04:42,548 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:04:42,549 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 184 interpolants. [2022-12-14 14:04:42,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3887, Invalid=32023, Unknown=0, NotChecked=0, Total=35910 [2022-12-14 14:04:42,550 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) [2022-12-14 14:04:58,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:04:58,795 INFO L93 Difference]: Finished difference Result 235 states and 264 transitions. [2022-12-14 14:04:58,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-12-14 14:04:58,795 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 [2022-12-14 14:04:58,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:04:58,796 INFO L225 Difference]: With dead ends: 235 [2022-12-14 14:04:58,796 INFO L226 Difference]: Without dead ends: 146 [2022-12-14 14:04:58,798 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 466 GetRequests, 216 SyntacticMatches, 0 SemanticMatches, 250 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17215 ImplicationChecksByTransitivity, 25.8s TimeCoverageRelationStatistics Valid=6937, Invalid=56315, Unknown=0, NotChecked=0, Total=63252 [2022-12-14 14:04:58,799 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 159 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 4370 mSolverCounterSat, 496 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 4866 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 496 IncrementalHoareTripleChecker+Valid, 4370 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:04:58,799 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [159 Valid, 131 Invalid, 4866 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [496 Valid, 4370 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-12-14 14:04:58,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2022-12-14 14:04:59,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 143. [2022-12-14 14:04:59,156 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) [2022-12-14 14:04:59,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 170 transitions. [2022-12-14 14:04:59,157 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 170 transitions. Word has length 115 [2022-12-14 14:04:59,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:04:59,157 INFO L495 AbstractCegarLoop]: Abstraction has 143 states and 170 transitions. [2022-12-14 14:04:59,157 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) [2022-12-14 14:04:59,157 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 170 transitions. [2022-12-14 14:04:59,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-12-14 14:04:59,157 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:04:59,157 INFO L195 NwaCegarLoop]: trace histogram [29, 28, 27, 27, 1, 1, 1, 1, 1] [2022-12-14 14:04:59,162 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Ended with exit code 0 [2022-12-14 14:04:59,358 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:04:59,359 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:04:59,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:04:59,360 INFO L85 PathProgramCache]: Analyzing trace with hash 768354714, now seen corresponding path program 39 times [2022-12-14 14:04:59,360 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:04:59,361 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [94415034] [2022-12-14 14:04:59,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:04:59,361 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:04:59,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:05:00,769 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 378 proven. 1164 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:05:00,769 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:05:00,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [94415034] [2022-12-14 14:05:00,769 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [94415034] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:05:00,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1595116569] [2022-12-14 14:05:00,769 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 14:05:00,769 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:05:00,770 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:05:00,770 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:05:00,771 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-12-14 14:05:00,845 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 14:05:00,845 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:05:00,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 454 conjuncts, 93 conjunts are in the unsatisfiable core [2022-12-14 14:05:00,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:05:01,828 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 0 proven. 1542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:05:01,828 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:05:03,052 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 0 proven. 1542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:05:03,052 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1595116569] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:05:03,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [539534412] [2022-12-14 14:05:03,053 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:05:03,053 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:05:03,053 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:05:03,053 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:05:03,053 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:05:03,107 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:05:03,566 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 [2022-12-14 14:05:03,566 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:05:03,567 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:05:03,567 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 119 [2022-12-14 14:05:03,567 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1267841325] [2022-12-14 14:05:03,567 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:05:03,567 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 119 states [2022-12-14 14:05:03,567 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:05:03,568 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2022-12-14 14:05:03,568 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2293, Invalid=13207, Unknown=0, NotChecked=0, Total=15500 [2022-12-14 14:05:03,568 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) [2022-12-14 14:05:06,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:05:06,013 INFO L93 Difference]: Finished difference Result 234 states and 262 transitions. [2022-12-14 14:05:06,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-12-14 14:05:06,013 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 [2022-12-14 14:05:06,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:05:06,014 INFO L225 Difference]: With dead ends: 234 [2022-12-14 14:05:06,014 INFO L226 Difference]: Without dead ends: 232 [2022-12-14 14:05:06,015 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 464 GetRequests, 255 SyntacticMatches, 28 SemanticMatches, 181 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11351 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=5479, Invalid=27827, Unknown=0, NotChecked=0, Total=33306 [2022-12-14 14:05:06,015 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 399 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 1515 mSolverCounterSat, 241 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 399 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 1756 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 241 IncrementalHoareTripleChecker+Valid, 1515 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 14:05:06,015 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [399 Valid, 91 Invalid, 1756 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [241 Valid, 1515 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 14:05:06,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2022-12-14 14:05:06,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 120. [2022-12-14 14:05:06,289 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) [2022-12-14 14:05:06,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 121 transitions. [2022-12-14 14:05:06,289 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 121 transitions. Word has length 116 [2022-12-14 14:05:06,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:05:06,289 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 121 transitions. [2022-12-14 14:05:06,289 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) [2022-12-14 14:05:06,289 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 121 transitions. [2022-12-14 14:05:06,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2022-12-14 14:05:06,290 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:05:06,290 INFO L195 NwaCegarLoop]: trace histogram [29, 29, 28, 28, 1, 1, 1, 1, 1] [2022-12-14 14:05:06,295 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2022-12-14 14:05:06,491 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2022-12-14 14:05:06,491 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:05:06,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:05:06,492 INFO L85 PathProgramCache]: Analyzing trace with hash -2115577660, now seen corresponding path program 40 times [2022-12-14 14:05:06,493 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:05:06,493 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [526396413] [2022-12-14 14:05:06,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:05:06,494 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:05:06,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:05:09,444 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 1080 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:05:09,444 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:05:09,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [526396413] [2022-12-14 14:05:09,445 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [526396413] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:05:09,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [435301968] [2022-12-14 14:05:09,445 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 14:05:09,445 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:05:09,445 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:05:09,446 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:05:09,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-12-14 14:05:09,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:05:09,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 464 conjuncts, 124 conjunts are in the unsatisfiable core [2022-12-14 14:05:09,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:05:11,460 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 0 proven. 1625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:05:11,460 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:05:17,318 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 0 proven. 1625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:05:17,319 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [435301968] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:05:17,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1898602175] [2022-12-14 14:05:17,319 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:05:17,319 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:05:17,320 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:05:17,320 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:05:17,320 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:05:17,382 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:05:18,387 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 [2022-12-14 14:05:18,387 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:05:18,387 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:05:18,387 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 62, 62] total 153 [2022-12-14 14:05:18,387 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [931344744] [2022-12-14 14:05:18,387 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:05:18,388 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 153 states [2022-12-14 14:05:18,388 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:05:18,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 153 interpolants. [2022-12-14 14:05:18,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3354, Invalid=21768, Unknown=0, NotChecked=0, Total=25122 [2022-12-14 14:05:18,391 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) [2022-12-14 14:05:41,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:05:41,508 INFO L93 Difference]: Finished difference Result 330 states and 363 transitions. [2022-12-14 14:05:41,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 154 states. [2022-12-14 14:05:41,508 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 [2022-12-14 14:05:41,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:05:41,509 INFO L225 Difference]: With dead ends: 330 [2022-12-14 14:05:41,509 INFO L226 Difference]: Without dead ends: 238 [2022-12-14 14:05:41,512 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 538 GetRequests, 261 SyntacticMatches, 0 SemanticMatches, 277 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20723 ImplicationChecksByTransitivity, 27.1s TimeCoverageRelationStatistics Valid=10001, Invalid=67561, Unknown=0, NotChecked=0, Total=77562 [2022-12-14 14:05:41,513 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 725 mSDsluCounter, 911 mSDsCounter, 0 mSdLazyCounter, 7990 mSolverCounterSat, 912 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 725 SdHoareTripleChecker+Valid, 914 SdHoareTripleChecker+Invalid, 8902 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 912 IncrementalHoareTripleChecker+Valid, 7990 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2022-12-14 14:05:41,513 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [725 Valid, 914 Invalid, 8902 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [912 Valid, 7990 Invalid, 0 Unknown, 0 Unchecked, 3.8s Time] [2022-12-14 14:05:41,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2022-12-14 14:05:41,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 153. [2022-12-14 14:05:41,958 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) [2022-12-14 14:05:41,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 183 transitions. [2022-12-14 14:05:41,959 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 183 transitions. Word has length 119 [2022-12-14 14:05:41,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:05:41,959 INFO L495 AbstractCegarLoop]: Abstraction has 153 states and 183 transitions. [2022-12-14 14:05:41,959 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) [2022-12-14 14:05:41,959 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 183 transitions. [2022-12-14 14:05:41,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-12-14 14:05:41,960 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:05:41,960 INFO L195 NwaCegarLoop]: trace histogram [30, 30, 29, 29, 1, 1, 1, 1, 1] [2022-12-14 14:05:41,964 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Ended with exit code 0 [2022-12-14 14:05:42,160 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2022-12-14 14:05:42,161 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:05:42,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:05:42,162 INFO L85 PathProgramCache]: Analyzing trace with hash -287448774, now seen corresponding path program 41 times [2022-12-14 14:05:42,162 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:05:42,163 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [502477315] [2022-12-14 14:05:42,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:05:42,163 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:05:42,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:05:45,425 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 1162 proven. 579 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:05:45,425 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:05:45,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [502477315] [2022-12-14 14:05:45,425 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [502477315] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:05:45,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1210256218] [2022-12-14 14:05:45,425 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 14:05:45,425 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:05:45,425 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:05:45,426 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:05:45,427 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-12-14 14:05:45,540 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2022-12-14 14:05:45,540 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:05:45,543 INFO L263 TraceCheckSpWp]: Trace formula consists of 479 conjuncts, 104 conjunts are in the unsatisfiable core [2022-12-14 14:05:45,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:05:49,978 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 0 proven. 1741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:05:49,978 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:05:56,204 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 0 proven. 1741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:05:56,204 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1210256218] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:05:56,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [811260748] [2022-12-14 14:05:56,204 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:05:56,204 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:05:56,205 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:05:56,205 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:05:56,205 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:05:56,265 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:05:57,092 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 [2022-12-14 14:05:57,092 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:05:57,092 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:05:57,092 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 66, 66] total 192 [2022-12-14 14:05:57,092 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273816930] [2022-12-14 14:05:57,092 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:05:57,093 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 192 states [2022-12-14 14:05:57,093 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:05:57,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 192 interpolants. [2022-12-14 14:05:57,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4245, Invalid=34761, Unknown=0, NotChecked=0, Total=39006 [2022-12-14 14:05:57,097 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) [2022-12-14 14:06:16,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:06:16,070 INFO L93 Difference]: Finished difference Result 251 states and 282 transitions. [2022-12-14 14:06:16,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2022-12-14 14:06:16,071 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 [2022-12-14 14:06:16,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:06:16,071 INFO L225 Difference]: With dead ends: 251 [2022-12-14 14:06:16,071 INFO L226 Difference]: Without dead ends: 156 [2022-12-14 14:06:16,074 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 236 SyntacticMatches, 0 SemanticMatches, 260 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18175 ImplicationChecksByTransitivity, 28.1s TimeCoverageRelationStatistics Valid=7523, Invalid=60859, Unknown=0, NotChecked=0, Total=68382 [2022-12-14 14:06:16,074 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 195 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 4523 mSolverCounterSat, 526 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 195 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 5049 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 526 IncrementalHoareTripleChecker+Valid, 4523 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:06:16,074 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [195 Valid, 130 Invalid, 5049 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [526 Valid, 4523 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-12-14 14:06:16,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2022-12-14 14:06:16,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 153. [2022-12-14 14:06:16,515 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) [2022-12-14 14:06:16,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 182 transitions. [2022-12-14 14:06:16,516 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 182 transitions. Word has length 123 [2022-12-14 14:06:16,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:06:16,516 INFO L495 AbstractCegarLoop]: Abstraction has 153 states and 182 transitions. [2022-12-14 14:06:16,516 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) [2022-12-14 14:06:16,516 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 182 transitions. [2022-12-14 14:06:16,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2022-12-14 14:06:16,517 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:06:16,517 INFO L195 NwaCegarLoop]: trace histogram [31, 30, 29, 29, 1, 1, 1, 1, 1] [2022-12-14 14:06:16,522 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Ended with exit code 0 [2022-12-14 14:06:16,717 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:06:16,717 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:06:16,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:06:16,718 INFO L85 PathProgramCache]: Analyzing trace with hash -984818342, now seen corresponding path program 42 times [2022-12-14 14:06:16,718 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:06:16,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [201761693] [2022-12-14 14:06:16,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:06:16,719 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:06:16,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:06:18,548 INFO L134 CoverageAnalysis]: Checked inductivity of 1772 backedges. 435 proven. 1337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:06:18,548 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:06:18,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [201761693] [2022-12-14 14:06:18,549 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [201761693] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:06:18,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1032845247] [2022-12-14 14:06:18,549 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 14:06:18,549 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:06:18,549 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:06:18,550 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:06:18,550 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-12-14 14:06:18,641 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 14:06:18,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:06:18,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 99 conjunts are in the unsatisfiable core [2022-12-14 14:06:18,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:06:19,736 INFO L134 CoverageAnalysis]: Checked inductivity of 1772 backedges. 0 proven. 1772 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:06:19,736 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:06:21,332 INFO L134 CoverageAnalysis]: Checked inductivity of 1772 backedges. 0 proven. 1772 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:06:21,332 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1032845247] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:06:21,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [442569923] [2022-12-14 14:06:21,333 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:06:21,333 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:06:21,333 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:06:21,333 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:06:21,333 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:06:21,403 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:06:21,946 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '42731#(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 [2022-12-14 14:06:21,946 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:06:21,946 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:06:21,946 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 127 [2022-12-14 14:06:21,946 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1580518777] [2022-12-14 14:06:21,946 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:06:21,946 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 127 states [2022-12-14 14:06:21,946 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:06:21,947 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 127 interpolants. [2022-12-14 14:06:21,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2604, Invalid=14952, Unknown=0, NotChecked=0, Total=17556 [2022-12-14 14:06:21,948 INFO L87 Difference]: Start difference. First operand 153 states and 182 transitions. Second operand has 127 states, 127 states have (on average 1.4960629921259843) internal successors, (190), 127 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:06:25,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:06:25,017 INFO L93 Difference]: Finished difference Result 250 states and 280 transitions. [2022-12-14 14:06:25,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-12-14 14:06:25,018 INFO L78 Accepts]: Start accepts. Automaton has has 127 states, 127 states have (on average 1.4960629921259843) internal successors, (190), 127 states have internal predecessors, (190), 0 states have call successors, (0), 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 124 [2022-12-14 14:06:25,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:06:25,018 INFO L225 Difference]: With dead ends: 250 [2022-12-14 14:06:25,018 INFO L226 Difference]: Without dead ends: 248 [2022-12-14 14:06:25,020 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 273 SyntacticMatches, 30 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12941 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=6227, Invalid=31603, Unknown=0, NotChecked=0, Total=37830 [2022-12-14 14:06:25,020 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 571 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 1629 mSolverCounterSat, 314 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 571 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 1943 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 314 IncrementalHoareTripleChecker+Valid, 1629 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 14:06:25,020 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [571 Valid, 81 Invalid, 1943 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [314 Valid, 1629 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 14:06:25,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2022-12-14 14:06:25,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 128. [2022-12-14 14:06:25,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 127 states have (on average 1.015748031496063) internal successors, (129), 127 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:06:25,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 129 transitions. [2022-12-14 14:06:25,324 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 129 transitions. Word has length 124 [2022-12-14 14:06:25,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:06:25,324 INFO L495 AbstractCegarLoop]: Abstraction has 128 states and 129 transitions. [2022-12-14 14:06:25,324 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 127 states, 127 states have (on average 1.4960629921259843) internal successors, (190), 127 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:06:25,324 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 129 transitions. [2022-12-14 14:06:25,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2022-12-14 14:06:25,325 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:06:25,325 INFO L195 NwaCegarLoop]: trace histogram [31, 31, 30, 30, 1, 1, 1, 1, 1] [2022-12-14 14:06:25,329 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Ended with exit code 0 [2022-12-14 14:06:25,525 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2022-12-14 14:06:25,526 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:06:25,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:06:25,526 INFO L85 PathProgramCache]: Analyzing trace with hash 203197700, now seen corresponding path program 43 times [2022-12-14 14:06:25,527 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:06:25,527 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [536728686] [2022-12-14 14:06:25,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:06:25,527 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:06:25,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:06:29,286 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 1247 proven. 614 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:06:29,286 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:06:29,286 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [536728686] [2022-12-14 14:06:29,286 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [536728686] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:06:29,286 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1844224627] [2022-12-14 14:06:29,286 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 14:06:29,286 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:06:29,286 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:06:29,287 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:06:29,288 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-12-14 14:06:29,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:06:29,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 494 conjuncts, 132 conjunts are in the unsatisfiable core [2022-12-14 14:06:29,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:06:31,560 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 0 proven. 1861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:06:31,560 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:06:37,204 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 0 proven. 1861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:06:37,205 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1844224627] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:06:37,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1473609809] [2022-12-14 14:06:37,205 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:06:37,205 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:06:37,206 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:06:37,206 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:06:37,206 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:06:37,264 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:06:38,146 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '44432#(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 [2022-12-14 14:06:38,146 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:06:38,146 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:06:38,147 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 66, 66] total 163 [2022-12-14 14:06:38,147 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [539181510] [2022-12-14 14:06:38,147 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:06:38,147 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 163 states [2022-12-14 14:06:38,147 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:06:38,149 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 163 interpolants. [2022-12-14 14:06:38,150 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3799, Invalid=24593, Unknown=0, NotChecked=0, Total=28392 [2022-12-14 14:06:38,150 INFO L87 Difference]: Start difference. First operand 128 states and 129 transitions. Second operand has 163 states, 163 states have (on average 2.1226993865030677) internal successors, (346), 163 states have internal predecessors, (346), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:07:05,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:07:05,613 INFO L93 Difference]: Finished difference Result 352 states and 387 transitions. [2022-12-14 14:07:05,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 164 states. [2022-12-14 14:07:05,613 INFO L78 Accepts]: Start accepts. Automaton has has 163 states, 163 states have (on average 2.1226993865030677) internal successors, (346), 163 states have internal predecessors, (346), 0 states have call successors, (0), 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 127 [2022-12-14 14:07:05,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:07:05,614 INFO L225 Difference]: With dead ends: 352 [2022-12-14 14:07:05,614 INFO L226 Difference]: Without dead ends: 254 [2022-12-14 14:07:05,617 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 574 GetRequests, 279 SyntacticMatches, 0 SemanticMatches, 295 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23515 ImplicationChecksByTransitivity, 30.9s TimeCoverageRelationStatistics Valid=11336, Invalid=76576, Unknown=0, NotChecked=0, Total=87912 [2022-12-14 14:07:05,617 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 807 mSDsluCounter, 1045 mSDsCounter, 0 mSdLazyCounter, 9315 mSolverCounterSat, 1037 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 807 SdHoareTripleChecker+Valid, 1048 SdHoareTripleChecker+Invalid, 10352 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1037 IncrementalHoareTripleChecker+Valid, 9315 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2022-12-14 14:07:05,618 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [807 Valid, 1048 Invalid, 10352 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1037 Valid, 9315 Invalid, 0 Unknown, 0 Unchecked, 4.5s Time] [2022-12-14 14:07:05,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2022-12-14 14:07:06,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 163. [2022-12-14 14:07:06,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 162 states have (on average 1.2037037037037037) internal successors, (195), 162 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:07:06,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 195 transitions. [2022-12-14 14:07:06,152 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 195 transitions. Word has length 127 [2022-12-14 14:07:06,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:07:06,152 INFO L495 AbstractCegarLoop]: Abstraction has 163 states and 195 transitions. [2022-12-14 14:07:06,152 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 163 states, 163 states have (on average 2.1226993865030677) internal successors, (346), 163 states have internal predecessors, (346), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:07:06,152 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 195 transitions. [2022-12-14 14:07:06,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2022-12-14 14:07:06,152 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:07:06,152 INFO L195 NwaCegarLoop]: trace histogram [32, 32, 31, 31, 1, 1, 1, 1, 1] [2022-12-14 14:07:06,157 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2022-12-14 14:07:06,353 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2022-12-14 14:07:06,353 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:07:06,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:07:06,353 INFO L85 PathProgramCache]: Analyzing trace with hash -991238918, now seen corresponding path program 44 times [2022-12-14 14:07:06,354 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:07:06,354 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [171018055] [2022-12-14 14:07:06,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:07:06,354 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:07:06,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:07:10,311 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 1335 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:07:10,311 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:07:10,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [171018055] [2022-12-14 14:07:10,311 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [171018055] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:07:10,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [521278811] [2022-12-14 14:07:10,311 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 14:07:10,311 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:07:10,311 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:07:10,312 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:07:10,312 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-12-14 14:07:10,429 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2022-12-14 14:07:10,430 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:07:10,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 509 conjuncts, 119 conjunts are in the unsatisfiable core [2022-12-14 14:07:10,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:07:15,579 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 0 proven. 1985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:07:15,580 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:07:23,619 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 0 proven. 1985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:07:23,619 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [521278811] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:07:23,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [147085839] [2022-12-14 14:07:23,620 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:07:23,620 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:07:23,620 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:07:23,620 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:07:23,620 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:07:23,675 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:07:24,842 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '46576#(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 [2022-12-14 14:07:24,842 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:07:24,842 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:07:24,842 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 72, 72] total 208 [2022-12-14 14:07:24,842 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [741761680] [2022-12-14 14:07:24,842 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:07:24,842 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 208 states [2022-12-14 14:07:24,843 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:07:24,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 208 interpolants. [2022-12-14 14:07:24,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4941, Invalid=40641, Unknown=0, NotChecked=0, Total=45582 [2022-12-14 14:07:24,845 INFO L87 Difference]: Start difference. First operand 163 states and 195 transitions. Second operand has 208 states, 208 states have (on average 1.8653846153846154) internal successors, (388), 208 states have internal predecessors, (388), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:07:50,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:07:50,710 INFO L93 Difference]: Finished difference Result 267 states and 300 transitions. [2022-12-14 14:07:50,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2022-12-14 14:07:50,711 INFO L78 Accepts]: Start accepts. Automaton has has 208 states, 208 states have (on average 1.8653846153846154) internal successors, (388), 208 states have internal predecessors, (388), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 131 [2022-12-14 14:07:50,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:07:50,712 INFO L225 Difference]: With dead ends: 267 [2022-12-14 14:07:50,712 INFO L226 Difference]: Without dead ends: 166 [2022-12-14 14:07:50,716 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 530 GetRequests, 248 SyntacticMatches, 0 SemanticMatches, 282 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21813 ImplicationChecksByTransitivity, 36.7s TimeCoverageRelationStatistics Valid=8807, Invalid=71565, Unknown=0, NotChecked=0, Total=80372 [2022-12-14 14:07:50,716 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 180 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 6692 mSolverCounterSat, 631 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 164 SdHoareTripleChecker+Invalid, 7323 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 631 IncrementalHoareTripleChecker+Valid, 6692 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2022-12-14 14:07:50,716 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [180 Valid, 164 Invalid, 7323 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [631 Valid, 6692 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2022-12-14 14:07:50,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2022-12-14 14:07:51,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 163. [2022-12-14 14:07:51,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 162 states have (on average 1.1975308641975309) internal successors, (194), 162 states have internal predecessors, (194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:07:51,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 194 transitions. [2022-12-14 14:07:51,398 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 194 transitions. Word has length 131 [2022-12-14 14:07:51,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:07:51,398 INFO L495 AbstractCegarLoop]: Abstraction has 163 states and 194 transitions. [2022-12-14 14:07:51,398 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 208 states, 208 states have (on average 1.8653846153846154) internal successors, (388), 208 states have internal predecessors, (388), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:07:51,398 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 194 transitions. [2022-12-14 14:07:51,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2022-12-14 14:07:51,398 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:07:51,398 INFO L195 NwaCegarLoop]: trace histogram [33, 32, 31, 31, 1, 1, 1, 1, 1] [2022-12-14 14:07:51,403 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Ended with exit code 0 [2022-12-14 14:07:51,599 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2022-12-14 14:07:51,599 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:07:51,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:07:51,600 INFO L85 PathProgramCache]: Analyzing trace with hash 858505498, now seen corresponding path program 45 times [2022-12-14 14:07:51,601 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:07:51,601 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [384568273] [2022-12-14 14:07:51,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:07:51,601 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:07:51,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:07:53,594 INFO L134 CoverageAnalysis]: Checked inductivity of 2018 backedges. 496 proven. 1522 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:07:53,594 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:07:53,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [384568273] [2022-12-14 14:07:53,594 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [384568273] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:07:53,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1384574116] [2022-12-14 14:07:53,595 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 14:07:53,595 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:07:53,595 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:07:53,596 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:07:53,596 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2022-12-14 14:07:53,697 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 14:07:53,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:07:53,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 514 conjuncts, 105 conjunts are in the unsatisfiable core [2022-12-14 14:07:53,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:07:55,253 INFO L134 CoverageAnalysis]: Checked inductivity of 2018 backedges. 0 proven. 2018 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:07:55,254 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:07:57,305 INFO L134 CoverageAnalysis]: Checked inductivity of 2018 backedges. 0 proven. 2018 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:07:57,305 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1384574116] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:07:57,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1068057892] [2022-12-14 14:07:57,306 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:07:57,306 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:07:57,306 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:07:57,306 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:07:57,306 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:07:57,358 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:07:57,992 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '48395#(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 [2022-12-14 14:07:57,992 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:07:57,992 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:07:57,992 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 135 [2022-12-14 14:07:57,992 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1655624958] [2022-12-14 14:07:57,992 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:07:57,993 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 135 states [2022-12-14 14:07:57,993 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:07:57,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 135 interpolants. [2022-12-14 14:07:57,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2935, Invalid=16805, Unknown=0, NotChecked=0, Total=19740 [2022-12-14 14:07:57,995 INFO L87 Difference]: Start difference. First operand 163 states and 194 transitions. Second operand has 135 states, 135 states have (on average 1.4962962962962962) internal successors, (202), 135 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:08:01,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:08:01,565 INFO L93 Difference]: Finished difference Result 266 states and 298 transitions. [2022-12-14 14:08:01,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2022-12-14 14:08:01,565 INFO L78 Accepts]: Start accepts. Automaton has has 135 states, 135 states have (on average 1.4962962962962962) internal successors, (202), 135 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 132 [2022-12-14 14:08:01,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:08:01,566 INFO L225 Difference]: With dead ends: 266 [2022-12-14 14:08:01,566 INFO L226 Difference]: Without dead ends: 264 [2022-12-14 14:08:01,567 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 528 GetRequests, 291 SyntacticMatches, 32 SemanticMatches, 205 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14635 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=7023, Invalid=35619, Unknown=0, NotChecked=0, Total=42642 [2022-12-14 14:08:01,568 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 521 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 1912 mSolverCounterSat, 286 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 521 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 2198 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 286 IncrementalHoareTripleChecker+Valid, 1912 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 14:08:01,568 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [521 Valid, 87 Invalid, 2198 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [286 Valid, 1912 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 14:08:01,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2022-12-14 14:08:02,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 136. [2022-12-14 14:08:02,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 135 states have (on average 1.0148148148148148) internal successors, (137), 135 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:08:02,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 137 transitions. [2022-12-14 14:08:02,078 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 137 transitions. Word has length 132 [2022-12-14 14:08:02,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:08:02,078 INFO L495 AbstractCegarLoop]: Abstraction has 136 states and 137 transitions. [2022-12-14 14:08:02,078 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 135 states, 135 states have (on average 1.4962962962962962) internal successors, (202), 135 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:08:02,079 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 137 transitions. [2022-12-14 14:08:02,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2022-12-14 14:08:02,079 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:08:02,079 INFO L195 NwaCegarLoop]: trace histogram [33, 33, 32, 32, 1, 1, 1, 1, 1] [2022-12-14 14:08:02,084 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Ended with exit code 0 [2022-12-14 14:08:02,280 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2022-12-14 14:08:02,280 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:08:02,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:08:02,281 INFO L85 PathProgramCache]: Analyzing trace with hash -788131516, now seen corresponding path program 46 times [2022-12-14 14:08:02,281 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:08:02,282 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1669015719] [2022-12-14 14:08:02,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:08:02,282 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:08:02,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:08:06,557 INFO L134 CoverageAnalysis]: Checked inductivity of 2113 backedges. 1426 proven. 687 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:08:06,557 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:08:06,557 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1669015719] [2022-12-14 14:08:06,557 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1669015719] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:08:06,557 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [807597735] [2022-12-14 14:08:06,557 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 14:08:06,557 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:08:06,557 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:08:06,558 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:08:06,559 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2022-12-14 14:08:06,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:08:06,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 524 conjuncts, 140 conjunts are in the unsatisfiable core [2022-12-14 14:08:06,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:08:09,382 INFO L134 CoverageAnalysis]: Checked inductivity of 2113 backedges. 0 proven. 2113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:08:09,383 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:08:16,461 INFO L134 CoverageAnalysis]: Checked inductivity of 2113 backedges. 0 proven. 2113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:08:16,461 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [807597735] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:08:16,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1423825627] [2022-12-14 14:08:16,461 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:08:16,462 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:08:16,462 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:08:16,462 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:08:16,462 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:08:16,523 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:08:17,594 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '50204#(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 [2022-12-14 14:08:17,594 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:08:17,594 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:08:17,594 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 70, 70] total 173 [2022-12-14 14:08:17,594 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [465654451] [2022-12-14 14:08:17,594 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:08:17,594 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 173 states [2022-12-14 14:08:17,595 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:08:17,595 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 173 interpolants. [2022-12-14 14:08:17,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4272, Invalid=27590, Unknown=0, NotChecked=0, Total=31862 [2022-12-14 14:08:17,597 INFO L87 Difference]: Start difference. First operand 136 states and 137 transitions. Second operand has 173 states, 173 states have (on average 2.1271676300578033) internal successors, (368), 173 states have internal predecessors, (368), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:08:48,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:08:48,834 INFO L93 Difference]: Finished difference Result 374 states and 411 transitions. [2022-12-14 14:08:48,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 174 states. [2022-12-14 14:08:48,834 INFO L78 Accepts]: Start accepts. Automaton has has 173 states, 173 states have (on average 2.1271676300578033) internal successors, (368), 173 states have internal predecessors, (368), 0 states have call successors, (0), 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 135 [2022-12-14 14:08:48,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:08:48,835 INFO L225 Difference]: With dead ends: 374 [2022-12-14 14:08:48,835 INFO L226 Difference]: Without dead ends: 270 [2022-12-14 14:08:48,838 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 610 GetRequests, 297 SyntacticMatches, 0 SemanticMatches, 313 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26483 ImplicationChecksByTransitivity, 36.3s TimeCoverageRelationStatistics Valid=12755, Invalid=86155, Unknown=0, NotChecked=0, Total=98910 [2022-12-14 14:08:48,839 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 886 mSDsluCounter, 1175 mSDsCounter, 0 mSdLazyCounter, 10668 mSolverCounterSat, 1169 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 886 SdHoareTripleChecker+Valid, 1178 SdHoareTripleChecker+Invalid, 11837 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1169 IncrementalHoareTripleChecker+Valid, 10668 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2022-12-14 14:08:48,839 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [886 Valid, 1178 Invalid, 11837 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1169 Valid, 10668 Invalid, 0 Unknown, 0 Unchecked, 4.9s Time] [2022-12-14 14:08:48,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2022-12-14 14:08:49,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 173. [2022-12-14 14:08:49,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 172 states have (on average 1.2034883720930232) internal successors, (207), 172 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:08:49,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 207 transitions. [2022-12-14 14:08:49,466 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 207 transitions. Word has length 135 [2022-12-14 14:08:49,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:08:49,467 INFO L495 AbstractCegarLoop]: Abstraction has 173 states and 207 transitions. [2022-12-14 14:08:49,467 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 173 states, 173 states have (on average 2.1271676300578033) internal successors, (368), 173 states have internal predecessors, (368), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:08:49,467 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 207 transitions. [2022-12-14 14:08:49,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2022-12-14 14:08:49,467 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:08:49,467 INFO L195 NwaCegarLoop]: trace histogram [34, 34, 33, 33, 1, 1, 1, 1, 1] [2022-12-14 14:08:49,472 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Ended with exit code 0 [2022-12-14 14:08:49,668 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:08:49,668 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:08:49,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:08:49,669 INFO L85 PathProgramCache]: Analyzing trace with hash -640542534, now seen corresponding path program 47 times [2022-12-14 14:08:49,669 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:08:49,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1735064965] [2022-12-14 14:08:49,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:08:49,670 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:08:49,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:08:54,098 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 1520 proven. 725 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:08:54,099 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:08:54,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1735064965] [2022-12-14 14:08:54,099 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1735064965] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:08:54,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [879583810] [2022-12-14 14:08:54,099 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 14:08:54,099 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:08:54,099 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:08:54,100 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:08:54,100 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2022-12-14 14:08:54,229 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2022-12-14 14:08:54,229 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:08:54,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 539 conjuncts, 123 conjunts are in the unsatisfiable core [2022-12-14 14:08:54,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:08:59,602 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 0 proven. 2245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:08:59,602 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:09:07,581 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 0 proven. 2245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:09:07,581 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [879583810] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:09:07,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [227302135] [2022-12-14 14:09:07,582 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:09:07,582 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:09:07,582 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:09:07,582 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:09:07,582 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:09:07,637 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:09:08,565 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '52480#(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 [2022-12-14 14:09:08,565 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:09:08,565 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:09:08,565 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 76, 76] total 220 [2022-12-14 14:09:08,565 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1629602235] [2022-12-14 14:09:08,565 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:09:08,566 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 220 states [2022-12-14 14:09:08,566 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:09:08,567 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 220 interpolants. [2022-12-14 14:09:08,568 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5513, Invalid=45337, Unknown=0, NotChecked=0, Total=50850 [2022-12-14 14:09:08,569 INFO L87 Difference]: Start difference. First operand 173 states and 207 transitions. Second operand has 220 states, 220 states have (on average 1.8727272727272728) internal successors, (412), 220 states have internal predecessors, (412), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:09:34,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:09:34,367 INFO L93 Difference]: Finished difference Result 283 states and 318 transitions. [2022-12-14 14:09:34,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2022-12-14 14:09:34,368 INFO L78 Accepts]: Start accepts. Automaton has has 220 states, 220 states have (on average 1.8727272727272728) internal successors, (412), 220 states have internal predecessors, (412), 0 states have call successors, (0), 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 139 [2022-12-14 14:09:34,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:09:34,368 INFO L225 Difference]: With dead ends: 283 [2022-12-14 14:09:34,368 INFO L226 Difference]: Without dead ends: 176 [2022-12-14 14:09:34,372 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 562 GetRequests, 264 SyntacticMatches, 0 SemanticMatches, 298 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24337 ImplicationChecksByTransitivity, 37.3s TimeCoverageRelationStatistics Valid=9811, Invalid=79889, Unknown=0, NotChecked=0, Total=89700 [2022-12-14 14:09:34,372 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 217 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 5766 mSolverCounterSat, 735 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 217 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 6501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 735 IncrementalHoareTripleChecker+Valid, 5766 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2022-12-14 14:09:34,372 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [217 Valid, 152 Invalid, 6501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [735 Valid, 5766 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2022-12-14 14:09:34,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2022-12-14 14:09:35,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 173. [2022-12-14 14:09:35,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 172 states have (on average 1.197674418604651) internal successors, (206), 172 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:09:35,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 206 transitions. [2022-12-14 14:09:35,024 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 206 transitions. Word has length 139 [2022-12-14 14:09:35,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:09:35,024 INFO L495 AbstractCegarLoop]: Abstraction has 173 states and 206 transitions. [2022-12-14 14:09:35,024 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 220 states, 220 states have (on average 1.8727272727272728) internal successors, (412), 220 states have internal predecessors, (412), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:09:35,024 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 206 transitions. [2022-12-14 14:09:35,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2022-12-14 14:09:35,024 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:09:35,024 INFO L195 NwaCegarLoop]: trace histogram [35, 34, 33, 33, 1, 1, 1, 1, 1] [2022-12-14 14:09:35,029 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Ended with exit code 0 [2022-12-14 14:09:35,225 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:09:35,226 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:09:35,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:09:35,227 INFO L85 PathProgramCache]: Analyzing trace with hash 1610929370, now seen corresponding path program 48 times [2022-12-14 14:09:35,227 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:09:35,227 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1816988333] [2022-12-14 14:09:35,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:09:35,228 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:09:35,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:09:37,509 INFO L134 CoverageAnalysis]: Checked inductivity of 2280 backedges. 561 proven. 1719 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:09:37,509 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:09:37,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1816988333] [2022-12-14 14:09:37,509 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1816988333] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:09:37,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [406659391] [2022-12-14 14:09:37,509 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 14:09:37,509 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:09:37,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:09:37,510 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:09:37,511 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2022-12-14 14:09:37,614 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 14:09:37,614 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:09:37,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 544 conjuncts, 111 conjunts are in the unsatisfiable core [2022-12-14 14:09:37,620 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:09:39,347 INFO L134 CoverageAnalysis]: Checked inductivity of 2280 backedges. 0 proven. 2280 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:09:39,347 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:09:41,342 INFO L134 CoverageAnalysis]: Checked inductivity of 2280 backedges. 0 proven. 2280 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:09:41,342 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [406659391] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:09:41,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [448601628] [2022-12-14 14:09:41,343 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:09:41,343 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:09:41,343 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:09:41,343 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:09:41,343 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:09:41,412 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:09:42,145 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '54409#(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 [2022-12-14 14:09:42,145 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:09:42,145 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:09:42,145 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 143 [2022-12-14 14:09:42,145 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [861164748] [2022-12-14 14:09:42,145 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:09:42,145 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 143 states [2022-12-14 14:09:42,145 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:09:42,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2022-12-14 14:09:42,147 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3286, Invalid=18766, Unknown=0, NotChecked=0, Total=22052 [2022-12-14 14:09:42,147 INFO L87 Difference]: Start difference. First operand 173 states and 206 transitions. Second operand has 143 states, 143 states have (on average 1.4965034965034965) internal successors, (214), 143 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) [2022-12-14 14:09:45,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:09:45,744 INFO L93 Difference]: Finished difference Result 282 states and 316 transitions. [2022-12-14 14:09:45,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2022-12-14 14:09:45,744 INFO L78 Accepts]: Start accepts. Automaton has has 143 states, 143 states have (on average 1.4965034965034965) internal successors, (214), 143 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 140 [2022-12-14 14:09:45,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:09:45,745 INFO L225 Difference]: With dead ends: 282 [2022-12-14 14:09:45,745 INFO L226 Difference]: Without dead ends: 280 [2022-12-14 14:09:45,747 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 560 GetRequests, 309 SyntacticMatches, 34 SemanticMatches, 217 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16433 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=7867, Invalid=39875, Unknown=0, NotChecked=0, Total=47742 [2022-12-14 14:09:45,747 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 539 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 2009 mSolverCounterSat, 300 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 539 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 2309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 300 IncrementalHoareTripleChecker+Valid, 2009 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-12-14 14:09:45,747 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [539 Valid, 93 Invalid, 2309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [300 Valid, 2009 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-12-14 14:09:45,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2022-12-14 14:09:46,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 144. [2022-12-14 14:09:46,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 143 states have (on average 1.013986013986014) internal successors, (145), 143 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:09:46,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 145 transitions. [2022-12-14 14:09:46,168 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 145 transitions. Word has length 140 [2022-12-14 14:09:46,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:09:46,169 INFO L495 AbstractCegarLoop]: Abstraction has 144 states and 145 transitions. [2022-12-14 14:09:46,169 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 143 states, 143 states have (on average 1.4965034965034965) internal successors, (214), 143 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) [2022-12-14 14:09:46,169 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 145 transitions. [2022-12-14 14:09:46,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2022-12-14 14:09:46,170 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:09:46,170 INFO L195 NwaCegarLoop]: trace histogram [35, 35, 34, 34, 1, 1, 1, 1, 1] [2022-12-14 14:09:46,174 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2022-12-14 14:09:46,370 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:09:46,371 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:09:46,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:09:46,372 INFO L85 PathProgramCache]: Analyzing trace with hash -762878588, now seen corresponding path program 49 times [2022-12-14 14:09:46,372 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:09:46,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1684790949] [2022-12-14 14:09:46,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:09:46,373 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:09:46,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:09:50,778 INFO L134 CoverageAnalysis]: Checked inductivity of 2381 backedges. 1617 proven. 764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:09:50,778 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:09:50,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1684790949] [2022-12-14 14:09:50,778 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1684790949] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:09:50,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1105803817] [2022-12-14 14:09:50,778 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 14:09:50,779 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:09:50,779 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:09:50,779 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:09:50,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2022-12-14 14:09:50,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:09:50,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 554 conjuncts, 148 conjunts are in the unsatisfiable core [2022-12-14 14:09:50,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:09:53,413 INFO L134 CoverageAnalysis]: Checked inductivity of 2381 backedges. 0 proven. 2381 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:09:53,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:10:00,509 INFO L134 CoverageAnalysis]: Checked inductivity of 2381 backedges. 0 proven. 2381 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:10:00,510 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1105803817] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:10:00,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1917623388] [2022-12-14 14:10:00,510 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:10:00,510 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:10:00,510 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:10:00,510 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:10:00,511 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:10:00,572 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:10:01,453 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '56326#(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 [2022-12-14 14:10:01,453 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:10:01,453 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:10:01,454 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 74, 74] total 183 [2022-12-14 14:10:01,454 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467474692] [2022-12-14 14:10:01,454 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:10:01,454 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 183 states [2022-12-14 14:10:01,454 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:10:01,455 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 183 interpolants. [2022-12-14 14:10:01,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4773, Invalid=30759, Unknown=0, NotChecked=0, Total=35532 [2022-12-14 14:10:01,456 INFO L87 Difference]: Start difference. First operand 144 states and 145 transitions. Second operand has 183 states, 183 states have (on average 2.1311475409836067) internal successors, (390), 183 states have internal predecessors, (390), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:10:35,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:10:35,916 INFO L93 Difference]: Finished difference Result 396 states and 435 transitions. [2022-12-14 14:10:35,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 184 states. [2022-12-14 14:10:35,916 INFO L78 Accepts]: Start accepts. Automaton has has 183 states, 183 states have (on average 2.1311475409836067) internal successors, (390), 183 states have internal predecessors, (390), 0 states have call successors, (0), 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 143 [2022-12-14 14:10:35,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:10:35,917 INFO L225 Difference]: With dead ends: 396 [2022-12-14 14:10:35,917 INFO L226 Difference]: Without dead ends: 286 [2022-12-14 14:10:35,921 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 646 GetRequests, 315 SyntacticMatches, 0 SemanticMatches, 331 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29627 ImplicationChecksByTransitivity, 38.7s TimeCoverageRelationStatistics Valid=14258, Invalid=96298, Unknown=0, NotChecked=0, Total=110556 [2022-12-14 14:10:35,921 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 978 mSDsluCounter, 1307 mSDsCounter, 0 mSdLazyCounter, 11018 mSolverCounterSat, 1310 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 978 SdHoareTripleChecker+Valid, 1310 SdHoareTripleChecker+Invalid, 12328 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1310 IncrementalHoareTripleChecker+Valid, 11018 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.3s IncrementalHoareTripleChecker+Time [2022-12-14 14:10:35,921 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [978 Valid, 1310 Invalid, 12328 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1310 Valid, 11018 Invalid, 0 Unknown, 0 Unchecked, 5.3s Time] [2022-12-14 14:10:35,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2022-12-14 14:10:36,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 183. [2022-12-14 14:10:36,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 182 states have (on average 1.2032967032967032) internal successors, (219), 182 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:10:36,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 219 transitions. [2022-12-14 14:10:36,667 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 219 transitions. Word has length 143 [2022-12-14 14:10:36,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:10:36,667 INFO L495 AbstractCegarLoop]: Abstraction has 183 states and 219 transitions. [2022-12-14 14:10:36,667 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 183 states, 183 states have (on average 2.1311475409836067) internal successors, (390), 183 states have internal predecessors, (390), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:10:36,667 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 219 transitions. [2022-12-14 14:10:36,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2022-12-14 14:10:36,668 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:10:36,668 INFO L195 NwaCegarLoop]: trace histogram [36, 36, 35, 35, 1, 1, 1, 1, 1] [2022-12-14 14:10:36,672 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Ended with exit code 0 [2022-12-14 14:10:36,868 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:10:36,869 INFO L420 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:10:36,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:10:36,870 INFO L85 PathProgramCache]: Analyzing trace with hash 1362066554, now seen corresponding path program 50 times [2022-12-14 14:10:36,870 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:10:36,870 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1395739439] [2022-12-14 14:10:36,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:10:36,871 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:10:36,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:10:41,868 INFO L134 CoverageAnalysis]: Checked inductivity of 2521 backedges. 1717 proven. 804 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:10:41,868 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:10:41,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1395739439] [2022-12-14 14:10:41,868 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1395739439] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:10:41,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1124374052] [2022-12-14 14:10:41,868 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 14:10:41,868 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:10:41,869 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:10:41,869 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:10:41,870 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2022-12-14 14:10:42,024 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2022-12-14 14:10:42,024 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:10:42,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 569 conjuncts, 128 conjunts are in the unsatisfiable core [2022-12-14 14:10:42,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:10:48,075 INFO L134 CoverageAnalysis]: Checked inductivity of 2521 backedges. 0 proven. 2521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:10:48,075 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:10:56,830 INFO L134 CoverageAnalysis]: Checked inductivity of 2521 backedges. 0 proven. 2521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:10:56,830 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1124374052] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:10:56,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1483018678] [2022-12-14 14:10:56,831 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:10:56,831 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:10:56,831 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:10:56,831 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:10:56,831 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:10:56,888 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:10:57,748 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '58734#(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 [2022-12-14 14:10:57,748 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:10:57,748 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:10:57,748 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 80, 80] total 232 [2022-12-14 14:10:57,748 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523476613] [2022-12-14 14:10:57,748 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:10:57,749 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 232 states [2022-12-14 14:10:57,749 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:10:57,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 232 interpolants. [2022-12-14 14:10:57,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6118, Invalid=50288, Unknown=0, NotChecked=0, Total=56406 [2022-12-14 14:10:57,752 INFO L87 Difference]: Start difference. First operand 183 states and 219 transitions. Second operand has 232 states, 232 states have (on average 1.8793103448275863) internal successors, (436), 232 states have internal predecessors, (436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:11:29,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:11:29,681 INFO L93 Difference]: Finished difference Result 299 states and 336 transitions. [2022-12-14 14:11:29,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2022-12-14 14:11:29,681 INFO L78 Accepts]: Start accepts. Automaton has has 232 states, 232 states have (on average 1.8793103448275863) internal successors, (436), 232 states have internal predecessors, (436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 147 [2022-12-14 14:11:29,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:11:29,682 INFO L225 Difference]: With dead ends: 299 [2022-12-14 14:11:29,682 INFO L226 Difference]: Without dead ends: 186 [2022-12-14 14:11:29,686 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 593 GetRequests, 280 SyntacticMatches, 0 SemanticMatches, 313 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26771 ImplicationChecksByTransitivity, 43.9s TimeCoverageRelationStatistics Valid=10824, Invalid=88086, Unknown=0, NotChecked=0, Total=98910 [2022-12-14 14:11:29,686 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 203 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 7184 mSolverCounterSat, 708 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 203 SdHoareTripleChecker+Valid, 155 SdHoareTripleChecker+Invalid, 7892 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 708 IncrementalHoareTripleChecker+Valid, 7184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2022-12-14 14:11:29,686 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [203 Valid, 155 Invalid, 7892 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [708 Valid, 7184 Invalid, 0 Unknown, 0 Unchecked, 3.6s Time] [2022-12-14 14:11:29,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2022-12-14 14:11:30,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 183. [2022-12-14 14:11:30,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 182 states have (on average 1.1978021978021978) internal successors, (218), 182 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:11:30,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 218 transitions. [2022-12-14 14:11:30,479 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 218 transitions. Word has length 147 [2022-12-14 14:11:30,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:11:30,479 INFO L495 AbstractCegarLoop]: Abstraction has 183 states and 218 transitions. [2022-12-14 14:11:30,479 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 232 states, 232 states have (on average 1.8793103448275863) internal successors, (436), 232 states have internal predecessors, (436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:11:30,479 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 218 transitions. [2022-12-14 14:11:30,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2022-12-14 14:11:30,480 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:11:30,480 INFO L195 NwaCegarLoop]: trace histogram [37, 36, 35, 35, 1, 1, 1, 1, 1] [2022-12-14 14:11:30,485 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Ended with exit code 0 [2022-12-14 14:11:30,680 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2022-12-14 14:11:30,680 INFO L420 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:11:30,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:11:30,681 INFO L85 PathProgramCache]: Analyzing trace with hash 1333008538, now seen corresponding path program 51 times [2022-12-14 14:11:30,681 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:11:30,681 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1844142142] [2022-12-14 14:11:30,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:11:30,681 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:11:30,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:11:33,038 INFO L134 CoverageAnalysis]: Checked inductivity of 2558 backedges. 630 proven. 1928 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:11:33,038 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:11:33,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1844142142] [2022-12-14 14:11:33,038 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1844142142] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:11:33,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1267901083] [2022-12-14 14:11:33,038 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 14:11:33,038 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:11:33,038 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:11:33,039 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:11:33,040 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2022-12-14 14:11:33,127 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 14:11:33,127 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:11:33,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 574 conjuncts, 117 conjunts are in the unsatisfiable core [2022-12-14 14:11:33,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:11:34,884 INFO L134 CoverageAnalysis]: Checked inductivity of 2558 backedges. 0 proven. 2558 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:11:34,884 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:11:37,179 INFO L134 CoverageAnalysis]: Checked inductivity of 2558 backedges. 0 proven. 2558 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:11:37,179 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1267901083] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:11:37,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1667051877] [2022-12-14 14:11:37,180 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:11:37,180 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:11:37,180 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:11:37,180 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:11:37,180 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:11:37,234 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:11:38,029 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '60771#(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 [2022-12-14 14:11:38,029 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:11:38,029 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:11:38,030 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76, 76] total 151 [2022-12-14 14:11:38,030 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668950947] [2022-12-14 14:11:38,030 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:11:38,030 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 151 states [2022-12-14 14:11:38,030 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:11:38,031 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 151 interpolants. [2022-12-14 14:11:38,032 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3657, Invalid=20835, Unknown=0, NotChecked=0, Total=24492 [2022-12-14 14:11:38,032 INFO L87 Difference]: Start difference. First operand 183 states and 218 transitions. Second operand has 151 states, 151 states have (on average 1.4966887417218544) internal successors, (226), 151 states have internal predecessors, (226), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:11:42,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:11:42,492 INFO L93 Difference]: Finished difference Result 298 states and 334 transitions. [2022-12-14 14:11:42,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2022-12-14 14:11:42,493 INFO L78 Accepts]: Start accepts. Automaton has has 151 states, 151 states have (on average 1.4966887417218544) internal successors, (226), 151 states have internal predecessors, (226), 0 states have call successors, (0), 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 148 [2022-12-14 14:11:42,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:11:42,493 INFO L225 Difference]: With dead ends: 298 [2022-12-14 14:11:42,493 INFO L226 Difference]: Without dead ends: 296 [2022-12-14 14:11:42,495 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 592 GetRequests, 327 SyntacticMatches, 36 SemanticMatches, 229 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18335 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=8759, Invalid=44371, Unknown=0, NotChecked=0, Total=53130 [2022-12-14 14:11:42,495 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 457 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 2294 mSolverCounterSat, 287 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 457 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 2581 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 287 IncrementalHoareTripleChecker+Valid, 2294 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-12-14 14:11:42,495 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [457 Valid, 105 Invalid, 2581 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [287 Valid, 2294 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-12-14 14:11:42,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2022-12-14 14:11:42,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 152. [2022-12-14 14:11:42,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 151 states have (on average 1.0132450331125828) internal successors, (153), 151 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:11:42,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 153 transitions. [2022-12-14 14:11:42,980 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 153 transitions. Word has length 148 [2022-12-14 14:11:42,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:11:42,981 INFO L495 AbstractCegarLoop]: Abstraction has 152 states and 153 transitions. [2022-12-14 14:11:42,981 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 151 states, 151 states have (on average 1.4966887417218544) internal successors, (226), 151 states have internal predecessors, (226), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:11:42,981 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 153 transitions. [2022-12-14 14:11:42,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2022-12-14 14:11:42,981 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:11:42,981 INFO L195 NwaCegarLoop]: trace histogram [37, 37, 36, 36, 1, 1, 1, 1, 1] [2022-12-14 14:11:42,986 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Ended with exit code 0 [2022-12-14 14:11:43,182 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2022-12-14 14:11:43,182 INFO L420 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:11:43,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:11:43,183 INFO L85 PathProgramCache]: Analyzing trace with hash 394561988, now seen corresponding path program 52 times [2022-12-14 14:11:43,183 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:11:43,184 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [579331751] [2022-12-14 14:11:43,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:11:43,184 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:11:43,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:11:48,204 INFO L134 CoverageAnalysis]: Checked inductivity of 2665 backedges. 1820 proven. 845 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:11:48,204 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:11:48,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [579331751] [2022-12-14 14:11:48,205 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [579331751] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:11:48,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [833952750] [2022-12-14 14:11:48,205 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 14:11:48,205 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:11:48,205 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:11:48,206 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:11:48,206 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2022-12-14 14:11:48,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:11:48,316 INFO L263 TraceCheckSpWp]: Trace formula consists of 584 conjuncts, 156 conjunts are in the unsatisfiable core [2022-12-14 14:11:48,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 14:11:51,371 INFO L134 CoverageAnalysis]: Checked inductivity of 2665 backedges. 0 proven. 2665 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:11:51,371 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 14:11:59,649 INFO L134 CoverageAnalysis]: Checked inductivity of 2665 backedges. 0 proven. 2665 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:11:59,649 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [833952750] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 14:11:59,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1326015121] [2022-12-14 14:11:59,650 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 14:11:59,650 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 14:11:59,650 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 14:11:59,650 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 14:11:59,650 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 14:11:59,713 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 14:12:00,629 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '62796#(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 [2022-12-14 14:12:00,629 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 14:12:00,629 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 14:12:00,629 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 78, 78] total 193 [2022-12-14 14:12:00,629 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021721361] [2022-12-14 14:12:00,629 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 14:12:00,630 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 193 states [2022-12-14 14:12:00,630 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 14:12:00,631 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 193 interpolants. [2022-12-14 14:12:00,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5302, Invalid=34100, Unknown=0, NotChecked=0, Total=39402 [2022-12-14 14:12:00,633 INFO L87 Difference]: Start difference. First operand 152 states and 153 transitions. Second operand has 193 states, 193 states have (on average 2.134715025906736) internal successors, (412), 193 states have internal predecessors, (412), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:12:39,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 14:12:39,406 INFO L93 Difference]: Finished difference Result 418 states and 459 transitions. [2022-12-14 14:12:39,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 194 states. [2022-12-14 14:12:39,407 INFO L78 Accepts]: Start accepts. Automaton has has 193 states, 193 states have (on average 2.134715025906736) internal successors, (412), 193 states have internal predecessors, (412), 0 states have call successors, (0), 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 151 [2022-12-14 14:12:39,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 14:12:39,408 INFO L225 Difference]: With dead ends: 418 [2022-12-14 14:12:39,408 INFO L226 Difference]: Without dead ends: 302 [2022-12-14 14:12:39,412 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 682 GetRequests, 333 SyntacticMatches, 0 SemanticMatches, 349 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32947 ImplicationChecksByTransitivity, 43.9s TimeCoverageRelationStatistics Valid=15845, Invalid=107005, Unknown=0, NotChecked=0, Total=122850 [2022-12-14 14:12:39,412 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 1070 mSDsluCounter, 1455 mSDsCounter, 0 mSdLazyCounter, 12146 mSolverCounterSat, 1459 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1070 SdHoareTripleChecker+Valid, 1458 SdHoareTripleChecker+Invalid, 13605 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1459 IncrementalHoareTripleChecker+Valid, 12146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.8s IncrementalHoareTripleChecker+Time [2022-12-14 14:12:39,412 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1070 Valid, 1458 Invalid, 13605 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1459 Valid, 12146 Invalid, 0 Unknown, 0 Unchecked, 5.8s Time] [2022-12-14 14:12:39,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2022-12-14 14:12:40,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 193. [2022-12-14 14:12:40,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 192 states have (on average 1.203125) internal successors, (231), 192 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:12:40,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 231 transitions. [2022-12-14 14:12:40,305 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 231 transitions. Word has length 151 [2022-12-14 14:12:40,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 14:12:40,305 INFO L495 AbstractCegarLoop]: Abstraction has 193 states and 231 transitions. [2022-12-14 14:12:40,305 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 193 states, 193 states have (on average 2.134715025906736) internal successors, (412), 193 states have internal predecessors, (412), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 14:12:40,305 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 231 transitions. [2022-12-14 14:12:40,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2022-12-14 14:12:40,306 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 14:12:40,306 INFO L195 NwaCegarLoop]: trace histogram [38, 38, 37, 37, 1, 1, 1, 1, 1] [2022-12-14 14:12:40,311 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2022-12-14 14:12:40,506 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:12:40,507 INFO L420 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 14:12:40,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 14:12:40,508 INFO L85 PathProgramCache]: Analyzing trace with hash 698290234, now seen corresponding path program 53 times [2022-12-14 14:12:40,508 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 14:12:40,508 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [690023216] [2022-12-14 14:12:40,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 14:12:40,509 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 14:12:40,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 14:12:45,361 INFO L134 CoverageAnalysis]: Checked inductivity of 2813 backedges. 1926 proven. 887 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 14:12:45,361 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 14:12:45,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [690023216] [2022-12-14 14:12:45,361 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [690023216] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 14:12:45,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1159205985] [2022-12-14 14:12:45,361 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 14:12:45,361 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 14:12:45,361 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 14:12:45,362 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 14:12:45,362 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f63a9416-0399-497f-b719-2a09c6fbbe2b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2022-12-14 14:12:45,528 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2022-12-14 14:12:45,528 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 14:12:45,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 599 conjuncts, 138 conjunts are in the unsatisfiable core [2022-12-14 14:12:45,534 INFO L286 TraceCheckSpWp]: Computing forward predicates...