./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/ps5-ll_unwindbound50.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4e7fbc69 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_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/ps5-ll_unwindbound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash a70bdaebce973cfb63a6da68866c665cdef037b6b862a38db5ed10fbf681a6e5 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-4e7fbc6 [2022-11-23 16:11:09,681 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-23 16:11:09,683 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-23 16:11:09,704 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-23 16:11:09,704 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-23 16:11:09,705 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-23 16:11:09,707 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-23 16:11:09,709 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-23 16:11:09,711 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-23 16:11:09,712 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-23 16:11:09,713 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-23 16:11:09,714 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-23 16:11:09,715 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-23 16:11:09,716 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-23 16:11:09,717 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-23 16:11:09,719 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-23 16:11:09,720 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-23 16:11:09,721 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-23 16:11:09,722 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-23 16:11:09,724 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-23 16:11:09,726 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-23 16:11:09,727 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-23 16:11:09,729 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-23 16:11:09,730 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-23 16:11:09,733 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-23 16:11:09,734 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-23 16:11:09,734 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-23 16:11:09,735 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-23 16:11:09,736 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-23 16:11:09,737 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-23 16:11:09,737 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-23 16:11:09,738 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-23 16:11:09,739 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-23 16:11:09,740 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-23 16:11:09,741 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-23 16:11:09,741 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-23 16:11:09,742 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-23 16:11:09,742 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-23 16:11:09,743 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-23 16:11:09,744 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-23 16:11:09,744 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-23 16:11:09,745 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-23 16:11:09,769 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-23 16:11:09,770 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-23 16:11:09,770 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-23 16:11:09,771 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-23 16:11:09,771 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-23 16:11:09,772 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-23 16:11:09,772 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-23 16:11:09,772 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-23 16:11:09,773 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-23 16:11:09,773 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-23 16:11:09,773 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-23 16:11:09,773 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-23 16:11:09,774 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-23 16:11:09,774 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-23 16:11:09,774 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-23 16:11:09,775 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-23 16:11:09,775 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-23 16:11:09,775 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-23 16:11:09,776 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-23 16:11:09,776 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-23 16:11:09,777 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-23 16:11:09,777 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-23 16:11:09,777 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-23 16:11:09,777 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-23 16:11:09,778 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-23 16:11:09,778 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-23 16:11:09,778 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-23 16:11:09,778 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-23 16:11:09,778 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-23 16:11:09,779 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-23 16:11:09,779 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-23 16:11:09,779 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-23 16:11:09,779 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 16:11:09,780 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-23 16:11:09,780 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-23 16:11:09,780 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-23 16:11:09,780 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-23 16:11:09,781 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-23 16:11:09,781 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-23 16:11:09,781 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-23 16:11:09,781 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-23 16:11:09,782 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_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a70bdaebce973cfb63a6da68866c665cdef037b6b862a38db5ed10fbf681a6e5 [2022-11-23 16:11:10,009 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-23 16:11:10,040 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-23 16:11:10,048 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-23 16:11:10,049 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-23 16:11:10,049 INFO L275 PluginConnector]: CDTParser initialized [2022-11-23 16:11:10,051 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/../../sv-benchmarks/c/nla-digbench-scaling/ps5-ll_unwindbound50.c [2022-11-23 16:11:13,094 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-23 16:11:13,308 INFO L351 CDTParser]: Found 1 translation units. [2022-11-23 16:11:13,309 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/sv-benchmarks/c/nla-digbench-scaling/ps5-ll_unwindbound50.c [2022-11-23 16:11:13,320 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/data/33d0dd864/c34b6d6f5ef04913911334195bc41da7/FLAG9f02894f4 [2022-11-23 16:11:13,335 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/data/33d0dd864/c34b6d6f5ef04913911334195bc41da7 [2022-11-23 16:11:13,338 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-23 16:11:13,340 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-23 16:11:13,341 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-23 16:11:13,342 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-23 16:11:13,346 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-23 16:11:13,347 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:11:13" (1/1) ... [2022-11-23 16:11:13,348 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@70af2620 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:11:13, skipping insertion in model container [2022-11-23 16:11:13,348 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:11:13" (1/1) ... [2022-11-23 16:11:13,357 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-23 16:11:13,372 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-23 16:11:13,516 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_112e8b45-1b3e-4aff-ad0f-809473dc6929/sv-benchmarks/c/nla-digbench-scaling/ps5-ll_unwindbound50.c[458,471] [2022-11-23 16:11:13,535 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 16:11:13,547 INFO L203 MainTranslator]: Completed pre-run [2022-11-23 16:11:13,561 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_112e8b45-1b3e-4aff-ad0f-809473dc6929/sv-benchmarks/c/nla-digbench-scaling/ps5-ll_unwindbound50.c[458,471] [2022-11-23 16:11:13,568 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 16:11:13,583 INFO L208 MainTranslator]: Completed translation [2022-11-23 16:11:13,583 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:11:13 WrapperNode [2022-11-23 16:11:13,584 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-23 16:11:13,585 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-23 16:11:13,585 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-23 16:11:13,585 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-23 16:11:13,594 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:11:13" (1/1) ... [2022-11-23 16:11:13,602 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:11:13" (1/1) ... [2022-11-23 16:11:13,627 INFO L138 Inliner]: procedures = 14, calls = 11, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 43 [2022-11-23 16:11:13,628 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-23 16:11:13,629 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-23 16:11:13,629 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-23 16:11:13,629 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-23 16:11:13,640 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:11:13" (1/1) ... [2022-11-23 16:11:13,642 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:11:13" (1/1) ... [2022-11-23 16:11:13,653 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:11:13" (1/1) ... [2022-11-23 16:11:13,654 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:11:13" (1/1) ... [2022-11-23 16:11:13,657 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:11:13" (1/1) ... [2022-11-23 16:11:13,665 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:11:13" (1/1) ... [2022-11-23 16:11:13,668 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:11:13" (1/1) ... [2022-11-23 16:11:13,670 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:11:13" (1/1) ... [2022-11-23 16:11:13,676 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-23 16:11:13,679 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-23 16:11:13,680 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-23 16:11:13,680 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-23 16:11:13,681 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:11:13" (1/1) ... [2022-11-23 16:11:13,689 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 16:11:13,702 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:11:13,718 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-23 16:11:13,747 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-23 16:11:13,772 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-23 16:11:13,772 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-23 16:11:13,772 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-23 16:11:13,773 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-23 16:11:13,773 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-23 16:11:13,773 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-23 16:11:13,862 INFO L235 CfgBuilder]: Building ICFG [2022-11-23 16:11:13,864 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-23 16:11:14,026 INFO L276 CfgBuilder]: Performing block encoding [2022-11-23 16:11:14,058 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-23 16:11:14,058 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-11-23 16:11:14,061 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:11:14 BoogieIcfgContainer [2022-11-23 16:11:14,061 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-23 16:11:14,064 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-23 16:11:14,064 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-23 16:11:14,068 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-23 16:11:14,068 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 04:11:13" (1/3) ... [2022-11-23 16:11:14,069 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@624cfe61 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:11:14, skipping insertion in model container [2022-11-23 16:11:14,069 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:11:13" (2/3) ... [2022-11-23 16:11:14,070 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@624cfe61 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:11:14, skipping insertion in model container [2022-11-23 16:11:14,070 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:11:14" (3/3) ... [2022-11-23 16:11:14,072 INFO L112 eAbstractionObserver]: Analyzing ICFG ps5-ll_unwindbound50.c [2022-11-23 16:11:14,092 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-23 16:11:14,092 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-23 16:11:14,148 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-23 16:11:14,156 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;@419b88aa, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-23 16:11:14,156 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-23 16:11:14,162 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-23 16:11:14,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-23 16:11:14,172 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:11:14,173 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-23 16:11:14,173 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:11:14,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:11:14,179 INFO L85 PathProgramCache]: Analyzing trace with hash -1749202120, now seen corresponding path program 1 times [2022-11-23 16:11:14,188 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:11:14,189 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [186196902] [2022-11-23 16:11:14,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:11:14,190 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:11:14,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:11:14,314 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:11:14,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [186196902] [2022-11-23 16:11:14,315 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-23 16:11:14,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1919492142] [2022-11-23 16:11:14,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:11:14,316 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:11:14,317 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:11:14,320 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:11:14,334 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-23 16:11:14,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:11:14,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-23 16:11:14,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:11:14,480 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:11:14,490 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 16:11:14,491 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1919492142] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:11:14,491 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 16:11:14,492 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-23 16:11:14,495 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158939199] [2022-11-23 16:11:14,496 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:11:14,502 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-23 16:11:14,502 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:11:14,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-23 16:11:14,571 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-23 16:11:14,573 INFO L87 Difference]: Start difference. First operand has 15 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:11:14,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:11:14,613 INFO L93 Difference]: Finished difference Result 29 states and 42 transitions. [2022-11-23 16:11:14,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-23 16:11:14,631 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-23 16:11:14,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:11:14,638 INFO L225 Difference]: With dead ends: 29 [2022-11-23 16:11:14,639 INFO L226 Difference]: Without dead ends: 13 [2022-11-23 16:11:14,641 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-23 16:11:14,645 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 2 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 16:11:14,646 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 16 Invalid, 2 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 16:11:14,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-11-23 16:11:14,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2022-11-23 16:11:14,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.375) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 16:11:14,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2022-11-23 16:11:14,694 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 6 [2022-11-23 16:11:14,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:11:14,695 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2022-11-23 16:11:14,695 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:11:14,695 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2022-11-23 16:11:14,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-23 16:11:14,695 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:11:14,696 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:11:14,703 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-23 16:11:14,904 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:11:14,905 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:11:14,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:11:14,906 INFO L85 PathProgramCache]: Analyzing trace with hash 1208885392, now seen corresponding path program 1 times [2022-11-23 16:11:14,906 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:11:14,906 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1259450274] [2022-11-23 16:11:14,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:11:14,907 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:11:14,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:11:14,949 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:11:14,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1259450274] [2022-11-23 16:11:14,955 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-23 16:11:14,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1892620950] [2022-11-23 16:11:14,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:11:14,962 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:11:14,963 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:11:14,965 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:11:14,973 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-23 16:11:15,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:11:15,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-23 16:11:15,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:11:15,118 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:11:15,119 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 16:11:15,119 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1892620950] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:11:15,119 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 16:11:15,119 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 16:11:15,120 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1141039220] [2022-11-23 16:11:15,120 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:11:15,121 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-23 16:11:15,121 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:11:15,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-23 16:11:15,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 16:11:15,122 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:11:15,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:11:15,158 INFO L93 Difference]: Finished difference Result 23 states and 27 transitions. [2022-11-23 16:11:15,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 16:11:15,161 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-23 16:11:15,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:11:15,162 INFO L225 Difference]: With dead ends: 23 [2022-11-23 16:11:15,163 INFO L226 Difference]: Without dead ends: 15 [2022-11-23 16:11:15,164 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 16:11:15,166 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 0 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 16:11:15,173 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 38 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 16:11:15,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-11-23 16:11:15,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-11-23 16:11:15,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 16:11:15,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2022-11-23 16:11:15,183 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 7 [2022-11-23 16:11:15,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:11:15,183 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2022-11-23 16:11:15,184 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:11:15,184 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2022-11-23 16:11:15,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-23 16:11:15,185 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:11:15,185 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:11:15,191 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-23 16:11:15,385 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2022-11-23 16:11:15,386 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:11:15,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:11:15,386 INFO L85 PathProgramCache]: Analyzing trace with hash 1210672852, now seen corresponding path program 1 times [2022-11-23 16:11:15,387 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:11:15,387 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1334460865] [2022-11-23 16:11:15,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:11:15,387 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:11:15,400 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 16:11:15,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [255786244] [2022-11-23 16:11:15,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:11:15,401 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:11:15,401 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:11:15,402 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:11:15,417 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-23 16:11:15,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:11:15,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-23 16:11:15,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:11:15,527 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:11:15,527 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 16:11:15,528 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:11:15,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1334460865] [2022-11-23 16:11:15,528 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 16:11:15,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [255786244] [2022-11-23 16:11:15,529 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [255786244] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:11:15,529 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 16:11:15,529 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-23 16:11:15,529 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [26932289] [2022-11-23 16:11:15,530 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:11:15,530 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 16:11:15,530 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:11:15,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 16:11:15,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-23 16:11:15,531 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:11:15,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:11:15,591 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2022-11-23 16:11:15,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-23 16:11:15,592 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-23 16:11:15,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:11:15,592 INFO L225 Difference]: With dead ends: 25 [2022-11-23 16:11:15,593 INFO L226 Difference]: Without dead ends: 21 [2022-11-23 16:11:15,593 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-23 16:11:15,594 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 6 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 16:11:15,595 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 41 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 16:11:15,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-11-23 16:11:15,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-11-23 16:11:15,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-23 16:11:15,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2022-11-23 16:11:15,603 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 7 [2022-11-23 16:11:15,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:11:15,603 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2022-11-23 16:11:15,604 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:11:15,604 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2022-11-23 16:11:15,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-23 16:11:15,605 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:11:15,605 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:11:15,616 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-23 16:11:15,811 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:11:15,811 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:11:15,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:11:15,812 INFO L85 PathProgramCache]: Analyzing trace with hash 479296502, now seen corresponding path program 1 times [2022-11-23 16:11:15,812 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:11:15,812 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1972305428] [2022-11-23 16:11:15,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:11:15,813 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:11:15,836 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 16:11:15,843 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [545967662] [2022-11-23 16:11:15,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:11:15,844 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:11:15,844 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:11:15,845 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:11:15,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-23 16:11:15,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:11:15,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-23 16:11:15,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:11:15,943 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:11:15,943 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:11:15,993 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:11:15,993 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:11:15,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1972305428] [2022-11-23 16:11:15,994 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 16:11:15,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [545967662] [2022-11-23 16:11:15,994 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [545967662] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:11:15,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1975563442] [2022-11-23 16:11:16,015 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-23 16:11:16,015 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:11:16,019 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:11:16,026 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:11:16,026 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:11:17,226 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 66 for LOIs [2022-11-23 16:11:17,350 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:11:20,016 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '350#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 16:11:20,016 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:11:20,017 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 16:11:20,017 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2022-11-23 16:11:20,017 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1358226879] [2022-11-23 16:11:20,017 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 16:11:20,018 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-23 16:11:20,018 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:11:20,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-23 16:11:20,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2022-11-23 16:11:20,023 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 16:11:20,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:11:20,164 INFO L93 Difference]: Finished difference Result 55 states and 65 transitions. [2022-11-23 16:11:20,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-23 16:11:20,165 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 15 [2022-11-23 16:11:20,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:11:20,166 INFO L225 Difference]: With dead ends: 55 [2022-11-23 16:11:20,168 INFO L226 Difference]: Without dead ends: 47 [2022-11-23 16:11:20,169 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=68, Invalid=312, Unknown=0, NotChecked=0, Total=380 [2022-11-23 16:11:20,171 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 37 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 16:11:20,175 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 86 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 16:11:20,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-11-23 16:11:20,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 43. [2022-11-23 16:11:20,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 28 states have (on average 1.25) internal successors, (35), 31 states have internal predecessors, (35), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-23 16:11:20,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 52 transitions. [2022-11-23 16:11:20,190 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 52 transitions. Word has length 15 [2022-11-23 16:11:20,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:11:20,191 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 52 transitions. [2022-11-23 16:11:20,191 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 16:11:20,192 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 52 transitions. [2022-11-23 16:11:20,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-23 16:11:20,193 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:11:20,193 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:11:20,204 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-23 16:11:20,399 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:11:20,400 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:11:20,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:11:20,400 INFO L85 PathProgramCache]: Analyzing trace with hash 481083962, now seen corresponding path program 1 times [2022-11-23 16:11:20,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:11:20,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [748746868] [2022-11-23 16:11:20,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:11:20,401 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:11:20,411 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 16:11:20,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [411246874] [2022-11-23 16:11:20,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:11:20,412 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:11:20,412 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:11:20,413 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:11:20,439 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-23 16:11:20,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:11:20,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-23 16:11:20,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:11:20,548 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:11:20,549 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:11:20,629 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-23 16:11:20,629 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:11:20,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [748746868] [2022-11-23 16:11:20,630 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 16:11:20,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [411246874] [2022-11-23 16:11:20,630 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [411246874] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-23 16:11:20,631 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 16:11:20,631 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2022-11-23 16:11:20,631 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820341610] [2022-11-23 16:11:20,631 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:11:20,632 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 16:11:20,632 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:11:20,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 16:11:20,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2022-11-23 16:11:20,633 INFO L87 Difference]: Start difference. First operand 43 states and 52 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 16:11:20,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:11:20,700 INFO L93 Difference]: Finished difference Result 57 states and 65 transitions. [2022-11-23 16:11:20,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 16:11:20,703 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-11-23 16:11:20,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:11:20,706 INFO L225 Difference]: With dead ends: 57 [2022-11-23 16:11:20,706 INFO L226 Difference]: Without dead ends: 49 [2022-11-23 16:11:20,707 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2022-11-23 16:11:20,711 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 8 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 16:11:20,714 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 26 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 16:11:20,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-11-23 16:11:20,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 43. [2022-11-23 16:11:20,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 32 states have internal predecessors, (34), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-23 16:11:20,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2022-11-23 16:11:20,738 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 15 [2022-11-23 16:11:20,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:11:20,739 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2022-11-23 16:11:20,739 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 16:11:20,739 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2022-11-23 16:11:20,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-23 16:11:20,741 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:11:20,741 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:11:20,752 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-23 16:11:20,947 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:11:20,947 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:11:20,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:11:20,948 INFO L85 PathProgramCache]: Analyzing trace with hash 669026573, now seen corresponding path program 1 times [2022-11-23 16:11:20,948 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:11:20,948 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [114965337] [2022-11-23 16:11:20,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:11:20,948 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:11:20,959 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 16:11:20,959 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [597574985] [2022-11-23 16:11:20,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:11:20,959 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:11:20,959 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:11:20,960 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:11:20,995 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-23 16:11:21,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:11:21,037 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-23 16:11:21,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:11:21,189 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 11 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 16:11:21,189 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:11:25,286 WARN L837 $PredicateComparison]: unable to prove that (or (= (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~k~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|)) (not (= (mod (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 15) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 10) (* |c_ULTIMATE.start_main_~y~0#1| 29) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 6)) 30) 0))) is different from false [2022-11-23 16:11:45,445 WARN L859 $PredicateComparison]: unable to prove that (or (not (= |c___VERIFIER_assert_#in~cond| 0)) (forall ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| Int) (|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_14| Int)) (or (= (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_14|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19|)) (= (mod (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| 6) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| 10) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| 29) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| 15)) 30) 0)))) is different from true [2022-11-23 16:12:03,538 WARN L859 $PredicateComparison]: unable to prove that (or (not (= |c___VERIFIER_assert_#in~cond| 0)) (forall ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| Int) (|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_14| Int)) (or (= (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_14|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19|)) (= (mod (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| 6) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| 10) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| 29) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| 15)) 30) 0))) (= c___VERIFIER_assert_~cond 0)) is different from true [2022-11-23 16:12:26,206 WARN L837 $PredicateComparison]: unable to prove that (or (forall ((|ULTIMATE.start_main_~k~0#1| Int)) (or (not (< |c_ULTIMATE.start_main_~c~0#1| |ULTIMATE.start_main_~k~0#1|)) (< (+ |c_ULTIMATE.start_main_~c~0#1| 1) |ULTIMATE.start_main_~k~0#1|) (= (+ |ULTIMATE.start_main_~k~0#1| (* |c_ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~k~0#1|)) (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| 2) 1)))) (not (= (mod (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 15) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 10) (* |c_ULTIMATE.start_main_~y~0#1| 29) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 6)) 30) 0))) is different from false [2022-11-23 16:12:28,243 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:12:28,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [114965337] [2022-11-23 16:12:28,244 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 16:12:28,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [597574985] [2022-11-23 16:12:28,244 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [597574985] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:12:28,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1836810351] [2022-11-23 16:12:28,246 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-23 16:12:28,247 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:12:28,247 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:12:28,247 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:12:28,247 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:12:28,986 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-23 16:12:28,993 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:12:29,644 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '887#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 16:12:29,644 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:12:29,644 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-23 16:12:29,644 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2022-11-23 16:12:29,645 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1119992861] [2022-11-23 16:12:29,645 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-23 16:12:29,645 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-23 16:12:29,645 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:12:29,646 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-23 16:12:29,646 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=357, Unknown=4, NotChecked=164, Total=600 [2022-11-23 16:12:29,646 INFO L87 Difference]: Start difference. First operand 43 states and 49 transitions. Second operand has 9 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-23 16:12:29,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:12:29,858 INFO L93 Difference]: Finished difference Result 48 states and 53 transitions. [2022-11-23 16:12:29,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-23 16:12:29,859 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 26 [2022-11-23 16:12:29,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:12:29,862 INFO L225 Difference]: With dead ends: 48 [2022-11-23 16:12:29,862 INFO L226 Difference]: Without dead ends: 42 [2022-11-23 16:12:29,863 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 4 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 18.8s TimeCoverageRelationStatistics Valid=95, Invalid=469, Unknown=4, NotChecked=188, Total=756 [2022-11-23 16:12:29,864 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 6 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 114 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 16:12:29,864 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 57 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 114 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 16:12:29,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-11-23 16:12:29,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2022-11-23 16:12:29,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.1) internal successors, (33), 31 states have internal predecessors, (33), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 16:12:29,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 46 transitions. [2022-11-23 16:12:29,880 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 46 transitions. Word has length 26 [2022-11-23 16:12:29,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:12:29,881 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 46 transitions. [2022-11-23 16:12:29,881 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-23 16:12:29,881 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 46 transitions. [2022-11-23 16:12:29,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-23 16:12:29,882 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:12:29,883 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:12:29,895 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-11-23 16:12:30,090 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-23 16:12:30,091 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:12:30,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:12:30,092 INFO L85 PathProgramCache]: Analyzing trace with hash 1479325671, now seen corresponding path program 2 times [2022-11-23 16:12:30,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:12:30,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [48744078] [2022-11-23 16:12:30,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:12:30,092 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:12:30,111 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 16:12:30,111 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1831499573] [2022-11-23 16:12:30,111 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 16:12:30,111 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:12:30,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:12:30,118 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:12:30,119 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-23 16:12:30,264 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-23 16:12:30,264 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:12:30,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-23 16:12:30,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:12:30,475 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 7 proven. 22 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-23 16:12:30,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:12:30,661 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:12:30,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [48744078] [2022-11-23 16:12:30,661 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 16:12:30,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1831499573] [2022-11-23 16:12:30,662 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1831499573] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:12:30,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [755628644] [2022-11-23 16:12:30,665 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-23 16:12:30,667 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:12:30,668 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:12:30,668 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:12:30,668 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:12:31,819 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-23 16:12:31,825 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:12:32,677 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1199#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 16:12:32,678 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:12:32,678 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-23 16:12:32,678 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2022-11-23 16:12:32,678 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663554933] [2022-11-23 16:12:32,678 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-23 16:12:32,679 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-23 16:12:32,679 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:12:32,679 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-23 16:12:32,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=432, Unknown=0, NotChecked=0, Total=506 [2022-11-23 16:12:32,680 INFO L87 Difference]: Start difference. First operand 42 states and 46 transitions. Second operand has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-23 16:12:32,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:12:32,916 INFO L93 Difference]: Finished difference Result 47 states and 50 transitions. [2022-11-23 16:12:32,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-23 16:12:32,918 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 34 [2022-11-23 16:12:32,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:12:32,921 INFO L225 Difference]: With dead ends: 47 [2022-11-23 16:12:32,921 INFO L226 Difference]: Without dead ends: 41 [2022-11-23 16:12:32,922 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=95, Invalid=555, Unknown=0, NotChecked=0, Total=650 [2022-11-23 16:12:32,922 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 7 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 16:12:32,923 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 74 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 16:12:32,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-11-23 16:12:32,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-11-23 16:12:32,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 30 states have internal predecessors, (32), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-23 16:12:32,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2022-11-23 16:12:32,944 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 34 [2022-11-23 16:12:32,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:12:32,945 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2022-11-23 16:12:32,946 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-23 16:12:32,946 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2022-11-23 16:12:32,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-23 16:12:32,949 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:12:32,949 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:12:32,957 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-23 16:12:33,156 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-23 16:12:33,156 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:12:33,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:12:33,157 INFO L85 PathProgramCache]: Analyzing trace with hash 179399873, now seen corresponding path program 3 times [2022-11-23 16:12:33,157 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:12:33,157 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [415738017] [2022-11-23 16:12:33,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:12:33,157 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:12:33,174 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 16:12:33,175 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2005351592] [2022-11-23 16:12:33,175 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 16:12:33,175 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:12:33,175 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:12:33,176 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:12:33,203 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-23 16:12:33,394 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 16:12:33,394 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:12:33,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-23 16:12:33,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:12:33,635 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 10 proven. 24 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-11-23 16:12:33,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:12:34,005 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 10 proven. 24 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-11-23 16:12:34,006 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:12:34,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [415738017] [2022-11-23 16:12:34,006 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 16:12:34,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2005351592] [2022-11-23 16:12:34,006 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2005351592] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:12:34,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1581599739] [2022-11-23 16:12:34,008 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-23 16:12:34,009 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:12:34,009 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:12:34,009 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:12:34,009 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:12:34,656 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-23 16:12:34,664 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:12:35,282 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1599#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 16:12:35,282 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:12:35,282 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 16:12:35,282 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2022-11-23 16:12:35,282 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1812555702] [2022-11-23 16:12:35,282 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 16:12:35,283 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-23 16:12:35,283 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:12:35,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-23 16:12:35,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=516, Unknown=0, NotChecked=0, Total=600 [2022-11-23 16:12:35,284 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand has 16 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 14 states have internal predecessors, (34), 10 states have call successors, (12), 3 states have call predecessors, (12), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-23 16:12:36,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:12:36,084 INFO L93 Difference]: Finished difference Result 71 states and 89 transitions. [2022-11-23 16:12:36,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-23 16:12:36,086 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 14 states have internal predecessors, (34), 10 states have call successors, (12), 3 states have call predecessors, (12), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Word has length 42 [2022-11-23 16:12:36,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:12:36,090 INFO L225 Difference]: With dead ends: 71 [2022-11-23 16:12:36,090 INFO L226 Difference]: Without dead ends: 63 [2022-11-23 16:12:36,092 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 100 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=166, Invalid=956, Unknown=0, NotChecked=0, Total=1122 [2022-11-23 16:12:36,094 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 21 mSDsluCounter, 191 mSDsCounter, 0 mSdLazyCounter, 199 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 226 SdHoareTripleChecker+Invalid, 235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 199 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 16:12:36,094 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 226 Invalid, 235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 199 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 16:12:36,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-11-23 16:12:36,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 55. [2022-11-23 16:12:36,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 40 states have (on average 1.125) internal successors, (45), 40 states have internal predecessors, (45), 10 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-23 16:12:36,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 64 transitions. [2022-11-23 16:12:36,126 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 64 transitions. Word has length 42 [2022-11-23 16:12:36,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:12:36,126 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 64 transitions. [2022-11-23 16:12:36,127 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 14 states have internal predecessors, (34), 10 states have call successors, (12), 3 states have call predecessors, (12), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-23 16:12:36,127 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 64 transitions. [2022-11-23 16:12:36,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-23 16:12:36,128 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:12:36,128 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:12:36,139 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-11-23 16:12:36,334 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:12:36,335 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:12:36,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:12:36,335 INFO L85 PathProgramCache]: Analyzing trace with hash -783657828, now seen corresponding path program 1 times [2022-11-23 16:12:36,335 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:12:36,335 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1817534505] [2022-11-23 16:12:36,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:12:36,336 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:12:36,353 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 16:12:36,355 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [861142533] [2022-11-23 16:12:36,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:12:36,355 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:12:36,355 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:12:36,357 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:12:36,383 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-23 16:12:36,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:12:36,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-23 16:12:36,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:12:36,536 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 24 proven. 56 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-23 16:12:36,536 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:12:36,668 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 10 proven. 32 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-11-23 16:12:36,668 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:12:36,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1817534505] [2022-11-23 16:12:36,668 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 16:12:36,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [861142533] [2022-11-23 16:12:36,669 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [861142533] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:12:36,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2136354738] [2022-11-23 16:12:36,671 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-23 16:12:36,672 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:12:36,672 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:12:36,672 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:12:36,672 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:12:37,301 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-23 16:12:37,307 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:12:37,734 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2083#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 16:12:37,734 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:12:37,734 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 16:12:37,734 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2022-11-23 16:12:37,734 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605293414] [2022-11-23 16:12:37,735 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 16:12:37,735 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-23 16:12:37,735 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:12:37,736 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-23 16:12:37,736 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=444, Unknown=0, NotChecked=0, Total=552 [2022-11-23 16:12:37,736 INFO L87 Difference]: Start difference. First operand 55 states and 64 transitions. Second operand has 14 states, 14 states have (on average 3.5714285714285716) internal successors, (50), 14 states have internal predecessors, (50), 9 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2022-11-23 16:12:38,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:12:38,044 INFO L93 Difference]: Finished difference Result 111 states and 120 transitions. [2022-11-23 16:12:38,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-23 16:12:38,046 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.5714285714285716) internal successors, (50), 14 states have internal predecessors, (50), 9 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) Word has length 44 [2022-11-23 16:12:38,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:12:38,047 INFO L225 Difference]: With dead ends: 111 [2022-11-23 16:12:38,047 INFO L226 Difference]: Without dead ends: 101 [2022-11-23 16:12:38,048 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 279 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=221, Invalid=835, Unknown=0, NotChecked=0, Total=1056 [2022-11-23 16:12:38,049 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 91 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 16:12:38,049 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [91 Valid, 111 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 16:12:38,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-11-23 16:12:38,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 91. [2022-11-23 16:12:38,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 66 states have (on average 1.0606060606060606) internal successors, (70), 68 states have internal predecessors, (70), 14 states have call successors, (14), 11 states have call predecessors, (14), 10 states have return successors, (13), 11 states have call predecessors, (13), 13 states have call successors, (13) [2022-11-23 16:12:38,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 97 transitions. [2022-11-23 16:12:38,069 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 97 transitions. Word has length 44 [2022-11-23 16:12:38,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:12:38,070 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 97 transitions. [2022-11-23 16:12:38,070 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.5714285714285716) internal successors, (50), 14 states have internal predecessors, (50), 9 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2022-11-23 16:12:38,070 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 97 transitions. [2022-11-23 16:12:38,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-11-23 16:12:38,071 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:12:38,072 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 8, 8, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:12:38,079 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-23 16:12:38,275 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:12:38,275 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:12:38,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:12:38,276 INFO L85 PathProgramCache]: Analyzing trace with hash 251755561, now seen corresponding path program 4 times [2022-11-23 16:12:38,276 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:12:38,276 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [750407813] [2022-11-23 16:12:38,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:12:38,276 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:12:38,294 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 16:12:38,298 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [730689795] [2022-11-23 16:12:38,299 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 16:12:38,299 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:12:38,299 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:12:38,300 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:12:38,323 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-23 16:12:42,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:12:42,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 44 conjunts are in the unsatisfiable core [2022-11-23 16:12:42,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:12:42,949 INFO L134 CoverageAnalysis]: Checked inductivity of 274 backedges. 41 proven. 113 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2022-11-23 16:12:42,949 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:12:47,038 WARN L837 $PredicateComparison]: unable to prove that (or (= (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~k~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|)) (not (= (mod (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 15) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 10) (* |c_ULTIMATE.start_main_~y~0#1| 29) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 6)) 30) 0))) is different from false [2022-11-23 16:13:07,111 WARN L859 $PredicateComparison]: unable to prove that (or (not (= |c___VERIFIER_assert_#in~cond| 0)) (forall ((|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_87| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| Int)) (or (= (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_87|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101|)) (= (mod (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| 10) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| 15) (* 29 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| 6)) 30) 0)))) is different from true [2022-11-23 16:13:25,166 WARN L859 $PredicateComparison]: unable to prove that (or (not (= |c___VERIFIER_assert_#in~cond| 0)) (= c___VERIFIER_assert_~cond 0) (forall ((|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_87| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| Int)) (or (= (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_87|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101|)) (= (mod (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| 10) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| 15) (* 29 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_101| 6)) 30) 0)))) is different from true [2022-11-23 16:13:29,183 WARN L837 $PredicateComparison]: unable to prove that (or (= (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~k~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|)) (< |c_ULTIMATE.start_main_~c~0#1| |c_ULTIMATE.start_main_~k~0#1|) (not (= (mod (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 15) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 10) (* |c_ULTIMATE.start_main_~y~0#1| 29) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 6)) 30) 0))) is different from false [2022-11-23 16:13:39,269 WARN L837 $PredicateComparison]: unable to prove that (or (forall ((|ULTIMATE.start_main_~k~0#1| Int)) (or (not (< |c_ULTIMATE.start_main_~c~0#1| |ULTIMATE.start_main_~k~0#1|)) (< (+ |c_ULTIMATE.start_main_~c~0#1| 1) |ULTIMATE.start_main_~k~0#1|) (= (+ |ULTIMATE.start_main_~k~0#1| (* |c_ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~k~0#1|)) (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| 2) 1)))) (not (= (mod (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 15) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 10) (* |c_ULTIMATE.start_main_~y~0#1| 29) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 6)) 30) 0))) is different from false [2022-11-23 16:13:41,294 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:13:41,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [750407813] [2022-11-23 16:13:41,294 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 16:13:41,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [730689795] [2022-11-23 16:13:41,294 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [730689795] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:13:41,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1171683031] [2022-11-23 16:13:41,296 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-23 16:13:41,297 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:13:41,297 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:13:41,297 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:13:41,297 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:13:42,093 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2022-11-23 16:13:42,110 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:13:43,174 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2691#(and (<= ~counter~0 51) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 16:13:43,174 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:13:43,174 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-23 16:13:43,174 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2022-11-23 16:13:43,175 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321625538] [2022-11-23 16:13:43,175 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-23 16:13:43,175 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-23 16:13:43,175 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:13:43,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-23 16:13:43,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=582, Unknown=5, NotChecked=260, Total=930 [2022-11-23 16:13:43,177 INFO L87 Difference]: Start difference. First operand 91 states and 97 transitions. Second operand has 15 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 14 states have internal predecessors, (34), 9 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-23 16:13:43,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:13:43,648 INFO L93 Difference]: Finished difference Result 96 states and 101 transitions. [2022-11-23 16:13:43,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-23 16:13:43,649 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 14 states have internal predecessors, (34), 9 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Word has length 74 [2022-11-23 16:13:43,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:13:43,654 INFO L225 Difference]: With dead ends: 96 [2022-11-23 16:13:43,654 INFO L226 Difference]: Without dead ends: 90 [2022-11-23 16:13:43,655 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 136 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 5 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=102, Invalid=725, Unknown=5, NotChecked=290, Total=1122 [2022-11-23 16:13:43,656 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 6 mSDsluCounter, 237 mSDsCounter, 0 mSdLazyCounter, 444 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 267 SdHoareTripleChecker+Invalid, 446 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 444 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 16:13:43,657 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 267 Invalid, 446 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 444 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 16:13:43,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-11-23 16:13:43,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2022-11-23 16:13:43,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 66 states have (on average 1.0454545454545454) internal successors, (69), 67 states have internal predecessors, (69), 13 states have call successors, (13), 11 states have call predecessors, (13), 10 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-23 16:13:43,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 94 transitions. [2022-11-23 16:13:43,683 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 94 transitions. Word has length 74 [2022-11-23 16:13:43,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:13:43,684 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 94 transitions. [2022-11-23 16:13:43,684 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 14 states have internal predecessors, (34), 9 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-23 16:13:43,684 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 94 transitions. [2022-11-23 16:13:43,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-11-23 16:13:43,685 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:13:43,686 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:13:43,693 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-23 16:13:43,891 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-23 16:13:43,891 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:13:43,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:13:43,891 INFO L85 PathProgramCache]: Analyzing trace with hash 1277611779, now seen corresponding path program 5 times [2022-11-23 16:13:43,892 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:13:43,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1590817372] [2022-11-23 16:13:43,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:13:43,892 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:13:43,901 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 16:13:43,901 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [523813926] [2022-11-23 16:13:43,902 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 16:13:43,902 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:13:43,902 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:13:43,903 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:13:43,927 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-23 16:22:02,877 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-23 16:22:02,877 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:22:02,907 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-23 16:22:02,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:22:03,244 INFO L134 CoverageAnalysis]: Checked inductivity of 344 backedges. 31 proven. 160 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-23 16:22:03,244 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:22:03,493 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:22:03,493 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1590817372] [2022-11-23 16:22:03,493 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 16:22:03,493 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [523813926] [2022-11-23 16:22:03,494 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [523813926] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:22:03,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [699108900] [2022-11-23 16:22:03,496 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-23 16:22:03,496 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:22:03,496 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:22:03,496 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:22:03,497 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:22:04,286 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2022-11-23 16:22:04,297 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:22:05,316 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3285#(and (<= ~counter~0 51) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 16:22:05,316 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:22:05,316 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-23 16:22:05,317 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2022-11-23 16:22:05,317 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1769502371] [2022-11-23 16:22:05,317 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-23 16:22:05,317 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-23 16:22:05,317 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:22:05,318 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-23 16:22:05,318 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=721, Unknown=0, NotChecked=0, Total=812 [2022-11-23 16:22:05,319 INFO L87 Difference]: Start difference. First operand 90 states and 94 transitions. Second operand has 16 states, 15 states have (on average 2.466666666666667) internal successors, (37), 15 states have internal predecessors, (37), 10 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-23 16:22:05,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:22:05,805 INFO L93 Difference]: Finished difference Result 95 states and 98 transitions. [2022-11-23 16:22:05,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-23 16:22:05,806 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.466666666666667) internal successors, (37), 15 states have internal predecessors, (37), 10 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Word has length 82 [2022-11-23 16:22:05,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:22:05,807 INFO L225 Difference]: With dead ends: 95 [2022-11-23 16:22:05,807 INFO L226 Difference]: Without dead ends: 89 [2022-11-23 16:22:05,808 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 154 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=111, Invalid=881, Unknown=0, NotChecked=0, Total=992 [2022-11-23 16:22:05,809 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 6 mSDsluCounter, 283 mSDsCounter, 0 mSdLazyCounter, 520 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 316 SdHoareTripleChecker+Invalid, 522 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 520 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 16:22:05,809 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 316 Invalid, 522 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 520 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 16:22:05,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-11-23 16:22:05,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2022-11-23 16:22:05,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 66 states have internal predecessors, (68), 12 states have call successors, (12), 11 states have call predecessors, (12), 10 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-11-23 16:22:05,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 91 transitions. [2022-11-23 16:22:05,829 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 91 transitions. Word has length 82 [2022-11-23 16:22:05,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:22:05,829 INFO L495 AbstractCegarLoop]: Abstraction has 89 states and 91 transitions. [2022-11-23 16:22:05,830 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.466666666666667) internal successors, (37), 15 states have internal predecessors, (37), 10 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-23 16:22:05,830 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 91 transitions. [2022-11-23 16:22:05,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2022-11-23 16:22:05,831 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:22:05,831 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 10, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:22:05,857 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-11-23 16:22:06,035 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-23 16:22:06,035 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:22:06,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:22:06,036 INFO L85 PathProgramCache]: Analyzing trace with hash -1038047267, now seen corresponding path program 6 times [2022-11-23 16:22:06,036 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:22:06,036 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [430928732] [2022-11-23 16:22:06,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:22:06,036 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:22:06,046 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 16:22:06,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [459704016] [2022-11-23 16:22:06,047 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 16:22:06,047 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:22:06,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:22:06,048 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:22:06,054 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-23 16:23:03,062 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 16:23:03,062 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:23:03,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 52 conjunts are in the unsatisfiable core [2022-11-23 16:23:03,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:23:03,462 INFO L134 CoverageAnalysis]: Checked inductivity of 422 backedges. 21 proven. 211 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2022-11-23 16:23:03,462 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:23:03,658 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:23:03,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [430928732] [2022-11-23 16:23:03,659 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-23 16:23:03,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [459704016] [2022-11-23 16:23:03,659 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [459704016] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:23:03,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1091730428] [2022-11-23 16:23:03,661 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-23 16:23:03,661 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:23:03,661 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:23:03,661 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:23:03,661 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:23:04,427 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2022-11-23 16:23:04,438 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:23:05,488 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3900#(and (<= ~counter~0 51) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 16:23:05,488 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:23:05,488 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-23 16:23:05,489 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2022-11-23 16:23:05,489 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648658848] [2022-11-23 16:23:05,489 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-23 16:23:05,489 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-23 16:23:05,489 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:23:05,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-23 16:23:05,491 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=776, Unknown=0, NotChecked=0, Total=870 [2022-11-23 16:23:05,491 INFO L87 Difference]: Start difference. First operand 89 states and 91 transitions. Second operand has 17 states, 16 states have (on average 2.5) internal successors, (40), 16 states have internal predecessors, (40), 11 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-11-23 16:23:06,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:23:06,023 INFO L93 Difference]: Finished difference Result 97 states and 101 transitions. [2022-11-23 16:23:06,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-23 16:23:06,024 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.5) internal successors, (40), 16 states have internal predecessors, (40), 11 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) Word has length 90 [2022-11-23 16:23:06,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:23:06,025 INFO L225 Difference]: With dead ends: 97 [2022-11-23 16:23:06,025 INFO L226 Difference]: Without dead ends: 91 [2022-11-23 16:23:06,026 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 169 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=114, Invalid=942, Unknown=0, NotChecked=0, Total=1056 [2022-11-23 16:23:06,026 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 7 mSDsluCounter, 312 mSDsCounter, 0 mSdLazyCounter, 575 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 349 SdHoareTripleChecker+Invalid, 577 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 575 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 16:23:06,027 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 349 Invalid, 577 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 575 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 16:23:06,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-11-23 16:23:06,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2022-11-23 16:23:06,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 67 states have (on average 1.0298507462686568) internal successors, (69), 67 states have internal predecessors, (69), 13 states have call successors, (13), 11 states have call predecessors, (13), 10 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-23 16:23:06,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2022-11-23 16:23:06,047 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 90 [2022-11-23 16:23:06,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:23:06,047 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2022-11-23 16:23:06,048 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.5) internal successors, (40), 16 states have internal predecessors, (40), 11 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-11-23 16:23:06,048 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2022-11-23 16:23:06,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-11-23 16:23:06,049 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:23:06,049 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:23:06,067 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-11-23 16:23:06,263 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-23 16:23:06,263 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:23:06,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:23:06,263 INFO L85 PathProgramCache]: Analyzing trace with hash 1775712440, now seen corresponding path program 2 times [2022-11-23 16:23:06,264 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:23:06,264 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [559546181] [2022-11-23 16:23:06,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:23:06,264 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:23:06,274 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-23 16:23:06,275 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1732926388] [2022-11-23 16:23:06,275 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 16:23:06,275 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:23:06,275 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:23:06,276 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:23:06,281 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_112e8b45-1b3e-4aff-ad0f-809473dc6929/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process