./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound50.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5e519f3a 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_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI --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 2d26d8e14d33b8c29eaf9ffa7603dd26966f962451e6c0726b154a73bf65f3d2 --- 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-5e519f3 [2022-11-03 02:45:23,081 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 02:45:23,083 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 02:45:23,117 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 02:45:23,117 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 02:45:23,119 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 02:45:23,120 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 02:45:23,122 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 02:45:23,124 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 02:45:23,125 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 02:45:23,126 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 02:45:23,127 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 02:45:23,128 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 02:45:23,129 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 02:45:23,130 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 02:45:23,132 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 02:45:23,133 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 02:45:23,134 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 02:45:23,135 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 02:45:23,137 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 02:45:23,139 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 02:45:23,141 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 02:45:23,142 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 02:45:23,143 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 02:45:23,147 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 02:45:23,147 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 02:45:23,148 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 02:45:23,149 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 02:45:23,149 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 02:45:23,150 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 02:45:23,150 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 02:45:23,151 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 02:45:23,152 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 02:45:23,153 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 02:45:23,155 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 02:45:23,155 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 02:45:23,156 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 02:45:23,156 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 02:45:23,156 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 02:45:23,158 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 02:45:23,158 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 02:45:23,160 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-03 02:45:23,185 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 02:45:23,185 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 02:45:23,186 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 02:45:23,186 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 02:45:23,187 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 02:45:23,187 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 02:45:23,187 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 02:45:23,187 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 02:45:23,188 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 02:45:23,188 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-03 02:45:23,188 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 02:45:23,188 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 02:45:23,188 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-03 02:45:23,189 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-03 02:45:23,189 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 02:45:23,189 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-03 02:45:23,189 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-03 02:45:23,190 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-03 02:45:23,190 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 02:45:23,191 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-03 02:45:23,191 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-03 02:45:23,191 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-03 02:45:23,191 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 02:45:23,191 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-03 02:45:23,192 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 02:45:23,192 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-03 02:45:23,192 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-03 02:45:23,192 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-03 02:45:23,192 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 02:45:23,193 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-03 02:45:23,193 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 02:45:23,193 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 02:45:23,193 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 02:45:23,194 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 02:45:23,194 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-03 02:45:23,194 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 02:45:23,194 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-03 02:45:23,194 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-03 02:45:23,195 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-03 02:45:23,195 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-03 02:45:23,195 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 02:45:23,195 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_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2d26d8e14d33b8c29eaf9ffa7603dd26966f962451e6c0726b154a73bf65f3d2 [2022-11-03 02:45:23,458 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 02:45:23,486 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 02:45:23,502 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 02:45:23,504 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 02:45:23,505 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 02:45:23,506 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound50.c [2022-11-03 02:45:23,603 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/data/39ad60022/b16a12eb6115441695886ae9b8e9ca06/FLAGd72138adb [2022-11-03 02:45:24,050 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 02:45:24,059 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound50.c [2022-11-03 02:45:24,065 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/data/39ad60022/b16a12eb6115441695886ae9b8e9ca06/FLAGd72138adb [2022-11-03 02:45:24,424 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/data/39ad60022/b16a12eb6115441695886ae9b8e9ca06 [2022-11-03 02:45:24,427 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 02:45:24,428 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 02:45:24,430 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 02:45:24,430 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 02:45:24,441 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 02:45:24,442 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 02:45:24" (1/1) ... [2022-11-03 02:45:24,443 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@436f9f06 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:45:24, skipping insertion in model container [2022-11-03 02:45:24,444 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 02:45:24" (1/1) ... [2022-11-03 02:45:24,452 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 02:45:24,469 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 02:45:24,683 WARN L230 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_961e4187-710e-488c-a16f-8f945ca7d43d/sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound50.c[489,502] [2022-11-03 02:45:24,724 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 02:45:24,734 INFO L203 MainTranslator]: Completed pre-run [2022-11-03 02:45:24,748 WARN L230 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_961e4187-710e-488c-a16f-8f945ca7d43d/sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound50.c[489,502] [2022-11-03 02:45:24,774 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 02:45:24,790 INFO L208 MainTranslator]: Completed translation [2022-11-03 02:45:24,791 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:45:24 WrapperNode [2022-11-03 02:45:24,791 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 02:45:24,793 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-03 02:45:24,793 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-03 02:45:24,793 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-03 02:45:24,801 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:45:24" (1/1) ... [2022-11-03 02:45:24,810 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:45:24" (1/1) ... [2022-11-03 02:45:24,836 INFO L138 Inliner]: procedures = 14, calls = 16, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 59 [2022-11-03 02:45:24,837 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-03 02:45:24,838 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-03 02:45:24,838 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-03 02:45:24,839 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-03 02:45:24,848 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:45:24" (1/1) ... [2022-11-03 02:45:24,849 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:45:24" (1/1) ... [2022-11-03 02:45:24,860 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:45:24" (1/1) ... [2022-11-03 02:45:24,860 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:45:24" (1/1) ... [2022-11-03 02:45:24,863 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:45:24" (1/1) ... [2022-11-03 02:45:24,867 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:45:24" (1/1) ... [2022-11-03 02:45:24,868 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:45:24" (1/1) ... [2022-11-03 02:45:24,869 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:45:24" (1/1) ... [2022-11-03 02:45:24,870 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-03 02:45:24,874 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-03 02:45:24,875 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-03 02:45:24,875 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-03 02:45:24,876 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:45:24" (1/1) ... [2022-11-03 02:45:24,883 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 02:45:24,894 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:45:24,917 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-03 02:45:24,935 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-03 02:45:24,965 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-03 02:45:24,966 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-03 02:45:24,966 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-03 02:45:24,966 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-03 02:45:24,966 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-03 02:45:24,966 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-03 02:45:24,967 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-03 02:45:24,967 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-03 02:45:25,046 INFO L235 CfgBuilder]: Building ICFG [2022-11-03 02:45:25,049 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-03 02:45:25,234 INFO L276 CfgBuilder]: Performing block encoding [2022-11-03 02:45:25,278 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-03 02:45:25,279 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-11-03 02:45:25,281 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 02:45:25 BoogieIcfgContainer [2022-11-03 02:45:25,281 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-03 02:45:25,283 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-03 02:45:25,283 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-03 02:45:25,288 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-03 02:45:25,288 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 02:45:24" (1/3) ... [2022-11-03 02:45:25,289 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1837506a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 02:45:25, skipping insertion in model container [2022-11-03 02:45:25,289 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:45:24" (2/3) ... [2022-11-03 02:45:25,289 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1837506a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 02:45:25, skipping insertion in model container [2022-11-03 02:45:25,289 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 02:45:25" (3/3) ... [2022-11-03 02:45:25,291 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd-ll_unwindbound50.c [2022-11-03 02:45:25,310 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-03 02:45:25,310 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-03 02:45:25,360 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-03 02:45:25,367 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;@2873bf94, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-03 02:45:25,367 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-03 02:45:25,371 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-03 02:45:25,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-03 02:45:25,387 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:45:25,388 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:45:25,390 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:45:25,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:45:25,401 INFO L85 PathProgramCache]: Analyzing trace with hash 2091718616, now seen corresponding path program 1 times [2022-11-03 02:45:25,412 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:45:25,414 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1130342110] [2022-11-03 02:45:25,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:45:25,416 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:45:25,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:45:25,633 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:45:25,634 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:45:25,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1130342110] [2022-11-03 02:45:25,637 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1130342110] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:45:25,637 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:45:25,638 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-03 02:45:25,640 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [916440971] [2022-11-03 02:45:25,641 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:45:25,662 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-03 02:45:25,663 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:45:25,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-03 02:45:25,714 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-03 02:45:25,716 INFO L87 Difference]: Start difference. First operand has 24 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:45:25,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:45:25,790 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2022-11-03 02:45:25,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-03 02:45:25,800 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 13 [2022-11-03 02:45:25,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:45:25,808 INFO L225 Difference]: With dead ends: 42 [2022-11-03 02:45:25,808 INFO L226 Difference]: Without dead ends: 22 [2022-11-03 02:45:25,812 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-03 02:45:25,815 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:45:25,816 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:45:25,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-11-03 02:45:25,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-11-03 02:45:25,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-03 02:45:25,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 30 transitions. [2022-11-03 02:45:25,883 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 30 transitions. Word has length 13 [2022-11-03 02:45:25,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:45:25,885 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 30 transitions. [2022-11-03 02:45:25,886 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:45:25,887 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 30 transitions. [2022-11-03 02:45:25,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-03 02:45:25,889 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:45:25,890 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:45:25,890 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-03 02:45:25,890 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:45:25,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:45:25,895 INFO L85 PathProgramCache]: Analyzing trace with hash -234462492, now seen corresponding path program 1 times [2022-11-03 02:45:25,895 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:45:25,896 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2048910962] [2022-11-03 02:45:25,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:45:25,897 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:45:25,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:45:26,070 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:45:26,070 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:45:26,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2048910962] [2022-11-03 02:45:26,071 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2048910962] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:45:26,071 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:45:26,071 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-03 02:45:26,071 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1295755856] [2022-11-03 02:45:26,071 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:45:26,073 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 02:45:26,073 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:45:26,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 02:45:26,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 02:45:26,074 INFO L87 Difference]: Start difference. First operand 22 states and 30 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:45:26,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:45:26,113 INFO L93 Difference]: Finished difference Result 34 states and 45 transitions. [2022-11-03 02:45:26,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 02:45:26,113 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2022-11-03 02:45:26,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:45:26,114 INFO L225 Difference]: With dead ends: 34 [2022-11-03 02:45:26,114 INFO L226 Difference]: Without dead ends: 24 [2022-11-03 02:45:26,115 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 02:45:26,116 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 3 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:45:26,117 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 69 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:45:26,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-11-03 02:45:26,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2022-11-03 02:45:26,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 12 states have (on average 1.25) internal successors, (15), 13 states have internal predecessors, (15), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-03 02:45:26,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2022-11-03 02:45:26,125 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 14 [2022-11-03 02:45:26,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:45:26,125 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2022-11-03 02:45:26,126 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:45:26,126 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2022-11-03 02:45:26,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-03 02:45:26,126 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:45:26,131 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:45:26,131 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-03 02:45:26,132 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:45:26,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:45:26,143 INFO L85 PathProgramCache]: Analyzing trace with hash -232794196, now seen corresponding path program 1 times [2022-11-03 02:45:26,143 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:45:26,143 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [654729934] [2022-11-03 02:45:26,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:45:26,144 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:45:26,169 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:45:26,169 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1637997125] [2022-11-03 02:45:26,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:45:26,170 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:45:26,170 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:45:26,176 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:45:26,184 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-03 02:45:26,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:45:26,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-03 02:45:26,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:45:26,353 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:45:26,354 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:45:26,354 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:45:26,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [654729934] [2022-11-03 02:45:26,355 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:45:26,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1637997125] [2022-11-03 02:45:26,355 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1637997125] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:45:26,355 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:45:26,356 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-03 02:45:26,356 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1855719801] [2022-11-03 02:45:26,356 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:45:26,357 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 02:45:26,357 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:45:26,358 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 02:45:26,358 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-03 02:45:26,358 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:45:26,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:45:26,437 INFO L93 Difference]: Finished difference Result 38 states and 52 transitions. [2022-11-03 02:45:26,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 02:45:26,438 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2022-11-03 02:45:26,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:45:26,439 INFO L225 Difference]: With dead ends: 38 [2022-11-03 02:45:26,439 INFO L226 Difference]: Without dead ends: 36 [2022-11-03 02:45:26,440 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:45:26,441 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 6 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:45:26,442 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 96 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:45:26,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-11-03 02:45:26,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2022-11-03 02:45:26,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 16 states have (on average 1.25) internal successors, (20), 18 states have internal predecessors, (20), 15 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2022-11-03 02:45:26,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 49 transitions. [2022-11-03 02:45:26,465 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 49 transitions. Word has length 14 [2022-11-03 02:45:26,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:45:26,466 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 49 transitions. [2022-11-03 02:45:26,466 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:45:26,466 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 49 transitions. [2022-11-03 02:45:26,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-03 02:45:26,467 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:45:26,467 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:45:26,496 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-11-03 02:45:26,687 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:45:26,687 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:45:26,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:45:26,688 INFO L85 PathProgramCache]: Analyzing trace with hash -1519768090, now seen corresponding path program 1 times [2022-11-03 02:45:26,688 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:45:26,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [415340645] [2022-11-03 02:45:26,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:45:26,689 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:45:26,702 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:45:26,703 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [416352619] [2022-11-03 02:45:26,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:45:26,703 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:45:26,703 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:45:26,707 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:45:26,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-03 02:45:26,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:45:26,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-03 02:45:26,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:45:26,973 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:45:26,973 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:45:26,974 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:45:26,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [415340645] [2022-11-03 02:45:26,974 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:45:26,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [416352619] [2022-11-03 02:45:26,974 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [416352619] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:45:26,975 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:45:26,975 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-11-03 02:45:26,975 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1134500665] [2022-11-03 02:45:26,975 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:45:26,976 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-03 02:45:26,976 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:45:26,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-03 02:45:26,977 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2022-11-03 02:45:26,977 INFO L87 Difference]: Start difference. First operand 35 states and 49 transitions. Second operand has 8 states, 6 states have (on average 2.0) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-03 02:45:27,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:45:27,166 INFO L93 Difference]: Finished difference Result 42 states and 55 transitions. [2022-11-03 02:45:27,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-03 02:45:27,167 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 2.0) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 19 [2022-11-03 02:45:27,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:45:27,168 INFO L225 Difference]: With dead ends: 42 [2022-11-03 02:45:27,168 INFO L226 Difference]: Without dead ends: 40 [2022-11-03 02:45:27,169 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2022-11-03 02:45:27,170 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 15 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:45:27,171 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 103 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:45:27,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-11-03 02:45:27,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2022-11-03 02:45:27,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 21 states have internal predecessors, (23), 15 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2022-11-03 02:45:27,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 52 transitions. [2022-11-03 02:45:27,183 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 52 transitions. Word has length 19 [2022-11-03 02:45:27,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:45:27,184 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 52 transitions. [2022-11-03 02:45:27,184 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 2.0) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-03 02:45:27,184 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 52 transitions. [2022-11-03 02:45:27,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-03 02:45:27,185 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:45:27,185 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:45:27,237 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-11-03 02:45:27,399 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:45:27,399 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:45:27,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:45:27,400 INFO L85 PathProgramCache]: Analyzing trace with hash -1808022612, now seen corresponding path program 1 times [2022-11-03 02:45:27,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:45:27,401 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1141993854] [2022-11-03 02:45:27,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:45:27,401 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:45:27,417 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:45:27,417 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [567165753] [2022-11-03 02:45:27,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:45:27,418 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:45:27,418 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:45:27,428 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:45:27,451 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-03 02:45:27,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:45:27,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-03 02:45:27,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:45:27,789 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-03 02:45:27,789 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:45:27,790 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:45:27,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1141993854] [2022-11-03 02:45:27,790 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:45:27,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [567165753] [2022-11-03 02:45:27,791 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [567165753] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:45:27,791 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:45:27,791 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-11-03 02:45:27,791 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561829759] [2022-11-03 02:45:27,792 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:45:27,792 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-03 02:45:27,792 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:45:27,793 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-03 02:45:27,793 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2022-11-03 02:45:27,793 INFO L87 Difference]: Start difference. First operand 39 states and 52 transitions. Second operand has 9 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-11-03 02:45:27,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:45:27,977 INFO L93 Difference]: Finished difference Result 46 states and 58 transitions. [2022-11-03 02:45:27,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-03 02:45:27,978 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 24 [2022-11-03 02:45:27,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:45:27,983 INFO L225 Difference]: With dead ends: 46 [2022-11-03 02:45:27,983 INFO L226 Difference]: Without dead ends: 42 [2022-11-03 02:45:27,985 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2022-11-03 02:45:27,991 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 30 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:45:27,993 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 101 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:45:27,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-11-03 02:45:28,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2022-11-03 02:45:28,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 24 states have internal predecessors, (26), 14 states have call successors, (14), 5 states have call predecessors, (14), 5 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-03 02:45:28,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 52 transitions. [2022-11-03 02:45:28,028 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 52 transitions. Word has length 24 [2022-11-03 02:45:28,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:45:28,028 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 52 transitions. [2022-11-03 02:45:28,028 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-11-03 02:45:28,029 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 52 transitions. [2022-11-03 02:45:28,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-03 02:45:28,030 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:45:28,030 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:45:28,072 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-03 02:45:28,230 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:45:28,230 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:45:28,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:45:28,231 INFO L85 PathProgramCache]: Analyzing trace with hash -1397146583, now seen corresponding path program 1 times [2022-11-03 02:45:28,231 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:45:28,232 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [690395722] [2022-11-03 02:45:28,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:45:28,232 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:45:28,244 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:45:28,244 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [732480779] [2022-11-03 02:45:28,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:45:28,245 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:45:28,245 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:45:28,246 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:45:28,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-03 02:45:28,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:45:28,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-03 02:45:28,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:45:28,324 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-03 02:45:28,325 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:45:28,325 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:45:28,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [690395722] [2022-11-03 02:45:28,325 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:45:28,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [732480779] [2022-11-03 02:45:28,326 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [732480779] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:45:28,326 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:45:28,326 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-03 02:45:28,326 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467641986] [2022-11-03 02:45:28,326 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:45:28,327 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 02:45:28,327 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:45:28,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 02:45:28,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-03 02:45:28,328 INFO L87 Difference]: Start difference. First operand 42 states and 52 transitions. Second operand has 5 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2022-11-03 02:45:28,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:45:28,411 INFO L93 Difference]: Finished difference Result 52 states and 64 transitions. [2022-11-03 02:45:28,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 02:45:28,412 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) Word has length 30 [2022-11-03 02:45:28,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:45:28,413 INFO L225 Difference]: With dead ends: 52 [2022-11-03 02:45:28,414 INFO L226 Difference]: Without dead ends: 50 [2022-11-03 02:45:28,414 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:45:28,415 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 5 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:45:28,415 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 100 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:45:28,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-03 02:45:28,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2022-11-03 02:45:28,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 25 states have (on average 1.16) internal successors, (29), 28 states have internal predecessors, (29), 15 states have call successors, (15), 6 states have call predecessors, (15), 6 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2022-11-03 02:45:28,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 57 transitions. [2022-11-03 02:45:28,436 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 57 transitions. Word has length 30 [2022-11-03 02:45:28,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:45:28,436 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 57 transitions. [2022-11-03 02:45:28,437 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2022-11-03 02:45:28,437 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 57 transitions. [2022-11-03 02:45:28,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-03 02:45:28,438 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:45:28,438 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:45:28,483 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-03 02:45:28,667 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:45:28,667 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:45:28,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:45:28,668 INFO L85 PathProgramCache]: Analyzing trace with hash 882095404, now seen corresponding path program 1 times [2022-11-03 02:45:28,668 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:45:28,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [899353497] [2022-11-03 02:45:28,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:45:28,669 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:45:28,685 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:45:28,686 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1431017317] [2022-11-03 02:45:28,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:45:28,686 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:45:28,686 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:45:28,692 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:45:28,695 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-03 02:45:28,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:45:28,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-03 02:45:28,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:45:28,845 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-03 02:45:28,845 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:45:28,930 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-03 02:45:28,931 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:45:28,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [899353497] [2022-11-03 02:45:28,932 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:45:28,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1431017317] [2022-11-03 02:45:28,939 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1431017317] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:45:28,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [787021562] [2022-11-03 02:45:28,956 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-03 02:45:28,956 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:45:28,960 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:45:28,965 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:45:28,965 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:45:32,321 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-03 02:45:32,327 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-03 02:45:32,359 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:45:33,961 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1217#(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 [2022-11-03 02:45:33,961 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:45:33,961 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:45:33,961 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2022-11-03 02:45:33,961 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120367407] [2022-11-03 02:45:33,962 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:45:33,962 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-03 02:45:33,962 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:45:33,963 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-03 02:45:33,963 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=451, Unknown=0, NotChecked=0, Total=552 [2022-11-03 02:45:33,963 INFO L87 Difference]: Start difference. First operand 47 states and 57 transitions. Second operand has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 5 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2022-11-03 02:45:34,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:45:34,162 INFO L93 Difference]: Finished difference Result 109 states and 132 transitions. [2022-11-03 02:45:34,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-03 02:45:34,163 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 5 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 32 [2022-11-03 02:45:34,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:45:34,165 INFO L225 Difference]: With dead ends: 109 [2022-11-03 02:45:34,165 INFO L226 Difference]: Without dead ends: 97 [2022-11-03 02:45:34,166 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 221 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=121, Invalid=581, Unknown=0, NotChecked=0, Total=702 [2022-11-03 02:45:34,167 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 60 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 165 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:45:34,167 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 165 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:45:34,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-11-03 02:45:34,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 91. [2022-11-03 02:45:34,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 50 states have (on average 1.16) internal successors, (58), 54 states have internal predecessors, (58), 29 states have call successors, (29), 12 states have call predecessors, (29), 11 states have return successors, (25), 24 states have call predecessors, (25), 25 states have call successors, (25) [2022-11-03 02:45:34,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 112 transitions. [2022-11-03 02:45:34,184 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 112 transitions. Word has length 32 [2022-11-03 02:45:34,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:45:34,184 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 112 transitions. [2022-11-03 02:45:34,185 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 5 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2022-11-03 02:45:34,185 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 112 transitions. [2022-11-03 02:45:34,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-03 02:45:34,186 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:45:34,186 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:45:34,230 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-03 02:45:34,399 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:45:34,399 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:45:34,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:45:34,400 INFO L85 PathProgramCache]: Analyzing trace with hash 883763700, now seen corresponding path program 1 times [2022-11-03 02:45:34,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:45:34,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1425888883] [2022-11-03 02:45:34,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:45:34,400 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:45:34,410 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:45:34,410 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1470036231] [2022-11-03 02:45:34,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:45:34,411 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:45:34,411 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:45:34,412 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:45:34,424 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-03 02:45:34,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:45:34,473 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-03 02:45:34,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:45:34,654 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-03 02:45:34,654 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:45:34,775 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-03 02:45:34,775 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:45:34,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1425888883] [2022-11-03 02:45:34,775 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:45:34,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1470036231] [2022-11-03 02:45:34,776 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1470036231] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-03 02:45:34,776 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:45:34,776 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2022-11-03 02:45:34,776 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092737337] [2022-11-03 02:45:34,777 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:45:34,777 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 02:45:34,777 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:45:34,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 02:45:34,778 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-11-03 02:45:34,778 INFO L87 Difference]: Start difference. First operand 91 states and 112 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-03 02:45:34,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:45:34,843 INFO L93 Difference]: Finished difference Result 105 states and 125 transitions. [2022-11-03 02:45:34,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 02:45:34,844 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 32 [2022-11-03 02:45:34,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:45:34,846 INFO L225 Difference]: With dead ends: 105 [2022-11-03 02:45:34,846 INFO L226 Difference]: Without dead ends: 103 [2022-11-03 02:45:34,846 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 55 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-11-03 02:45:34,847 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 7 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:45:34,848 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 64 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:45:34,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2022-11-03 02:45:34,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2022-11-03 02:45:34,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 59 states have (on average 1.1355932203389831) internal successors, (67), 63 states have internal predecessors, (67), 29 states have call successors, (29), 15 states have call predecessors, (29), 14 states have return successors, (25), 24 states have call predecessors, (25), 25 states have call successors, (25) [2022-11-03 02:45:34,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 121 transitions. [2022-11-03 02:45:34,891 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 121 transitions. Word has length 32 [2022-11-03 02:45:34,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:45:34,892 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 121 transitions. [2022-11-03 02:45:34,892 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-03 02:45:34,892 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 121 transitions. [2022-11-03 02:45:34,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-03 02:45:34,897 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:45:34,897 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:45:34,938 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-03 02:45:35,111 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:45:35,111 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:45:35,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:45:35,112 INFO L85 PathProgramCache]: Analyzing trace with hash 481580745, now seen corresponding path program 1 times [2022-11-03 02:45:35,112 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:45:35,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1096765845] [2022-11-03 02:45:35,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:45:35,112 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:45:35,121 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:45:35,121 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1909089005] [2022-11-03 02:45:35,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:45:35,122 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:45:35,122 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:45:35,123 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:45:35,141 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-03 02:45:35,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:45:35,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-03 02:45:35,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:45:35,245 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 7 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-03 02:45:35,245 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:45:35,343 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 7 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-03 02:45:35,344 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:45:35,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1096765845] [2022-11-03 02:45:35,344 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:45:35,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1909089005] [2022-11-03 02:45:35,344 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1909089005] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:45:35,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1135183892] [2022-11-03 02:45:35,347 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-03 02:45:35,347 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:45:35,348 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:45:35,348 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:45:35,348 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:45:35,808 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2022-11-03 02:45:35,818 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-03 02:45:35,845 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:45:37,587 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1135183892] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:45:37,587 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:45:37,587 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [8, 8] total 20 [2022-11-03 02:45:37,588 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544590843] [2022-11-03 02:45:37,588 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:45:37,589 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-03 02:45:37,589 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:45:37,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-03 02:45:37,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2022-11-03 02:45:37,590 INFO L87 Difference]: Start difference. First operand 103 states and 121 transitions. Second operand has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-11-03 02:45:37,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:45:37,780 INFO L93 Difference]: Finished difference Result 105 states and 122 transitions. [2022-11-03 02:45:37,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-03 02:45:37,781 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 35 [2022-11-03 02:45:37,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:45:37,782 INFO L225 Difference]: With dead ends: 105 [2022-11-03 02:45:37,782 INFO L226 Difference]: Without dead ends: 95 [2022-11-03 02:45:37,783 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 71 SyntacticMatches, 14 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 165 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2022-11-03 02:45:37,784 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 6 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 24 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:45:37,784 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 81 Invalid, 125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 99 Invalid, 0 Unknown, 24 Unchecked, 0.2s Time] [2022-11-03 02:45:37,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-11-03 02:45:37,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2022-11-03 02:45:37,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 54 states have (on average 1.1296296296296295) internal successors, (61), 58 states have internal predecessors, (61), 27 states have call successors, (27), 13 states have call predecessors, (27), 13 states have return successors, (24), 23 states have call predecessors, (24), 24 states have call successors, (24) [2022-11-03 02:45:37,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 112 transitions. [2022-11-03 02:45:37,804 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 112 transitions. Word has length 35 [2022-11-03 02:45:37,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:45:37,804 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 112 transitions. [2022-11-03 02:45:37,805 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-11-03 02:45:37,805 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 112 transitions. [2022-11-03 02:45:37,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-11-03 02:45:37,806 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:45:37,806 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:45:37,832 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-03 02:45:38,015 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-11-03 02:45:38,015 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:45:38,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:45:38,015 INFO L85 PathProgramCache]: Analyzing trace with hash 1530726558, now seen corresponding path program 2 times [2022-11-03 02:45:38,016 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:45:38,016 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1600093478] [2022-11-03 02:45:38,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:45:38,016 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:45:38,025 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:45:38,025 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [985674761] [2022-11-03 02:45:38,025 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:45:38,025 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:45:38,026 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:45:38,027 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:45:38,034 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-03 02:45:38,078 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-03 02:45:38,078 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:45:38,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-03 02:45:38,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:45:38,469 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-03 02:45:38,469 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:45:38,767 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-03 02:45:38,768 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:45:38,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1600093478] [2022-11-03 02:45:38,768 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:45:38,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [985674761] [2022-11-03 02:45:38,768 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [985674761] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:45:38,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1166886365] [2022-11-03 02:45:38,773 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-03 02:45:38,774 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:45:38,774 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:45:38,774 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:45:38,775 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:45:40,652 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-03 02:45:40,656 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-03 02:45:40,684 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:45:43,004 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2782#(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 [2022-11-03 02:45:43,004 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:45:43,004 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:45:43,004 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6] total 11 [2022-11-03 02:45:43,005 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1855337788] [2022-11-03 02:45:43,005 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:45:43,005 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-03 02:45:43,005 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:45:43,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-03 02:45:43,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=553, Unknown=0, NotChecked=0, Total=650 [2022-11-03 02:45:43,006 INFO L87 Difference]: Start difference. First operand 95 states and 112 transitions. Second operand has 11 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 7 states have call predecessors, (12), 6 states have call successors, (12) [2022-11-03 02:45:45,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:45:45,670 INFO L93 Difference]: Finished difference Result 105 states and 121 transitions. [2022-11-03 02:45:45,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-03 02:45:45,670 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 7 states have call predecessors, (12), 6 states have call successors, (12) Word has length 37 [2022-11-03 02:45:45,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:45:45,672 INFO L225 Difference]: With dead ends: 105 [2022-11-03 02:45:45,672 INFO L226 Difference]: Without dead ends: 103 [2022-11-03 02:45:45,673 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 83 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 197 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=125, Invalid=745, Unknown=0, NotChecked=0, Total=870 [2022-11-03 02:45:45,673 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 21 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 250 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 142 SdHoareTripleChecker+Invalid, 286 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 250 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:45:45,674 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 142 Invalid, 286 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 250 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-11-03 02:45:45,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2022-11-03 02:45:45,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2022-11-03 02:45:45,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 60 states have (on average 1.1166666666666667) internal successors, (67), 64 states have internal predecessors, (67), 27 states have call successors, (27), 15 states have call predecessors, (27), 15 states have return successors, (24), 23 states have call predecessors, (24), 24 states have call successors, (24) [2022-11-03 02:45:45,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 118 transitions. [2022-11-03 02:45:45,698 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 118 transitions. Word has length 37 [2022-11-03 02:45:45,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:45:45,698 INFO L495 AbstractCegarLoop]: Abstraction has 103 states and 118 transitions. [2022-11-03 02:45:45,699 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 7 states have call predecessors, (12), 6 states have call successors, (12) [2022-11-03 02:45:45,699 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 118 transitions. [2022-11-03 02:45:45,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-03 02:45:45,700 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:45:45,700 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:45:45,736 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-03 02:45:45,927 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-03 02:45:45,927 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:45:45,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:45:45,928 INFO L85 PathProgramCache]: Analyzing trace with hash -333653004, now seen corresponding path program 3 times [2022-11-03 02:45:45,928 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:45:45,928 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1360474170] [2022-11-03 02:45:45,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:45:45,928 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:45:45,937 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:45:45,944 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1494494918] [2022-11-03 02:45:45,945 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:45:45,945 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:45:45,945 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:45:45,959 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:45:45,963 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-03 02:45:46,011 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:45:46,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:45:46,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-03 02:45:46,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:45:46,491 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 23 proven. 10 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-03 02:45:46,491 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:45:46,939 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 28 proven. 5 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-03 02:45:46,939 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:45:46,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1360474170] [2022-11-03 02:45:46,940 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:45:46,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1494494918] [2022-11-03 02:45:46,940 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1494494918] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:45:46,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [159249823] [2022-11-03 02:45:46,943 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-03 02:45:46,943 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:45:46,943 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:45:46,944 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:45:46,944 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:45:48,732 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-03 02:45:48,736 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-03 02:45:48,761 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:45:51,177 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3367#(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 [2022-11-03 02:45:51,177 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:45:51,177 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:45:51,177 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 14 [2022-11-03 02:45:51,178 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [516271050] [2022-11-03 02:45:51,178 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:45:51,178 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-03 02:45:51,178 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:45:51,179 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-03 02:45:51,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=704, Unknown=0, NotChecked=0, Total=812 [2022-11-03 02:45:51,180 INFO L87 Difference]: Start difference. First operand 103 states and 118 transitions. Second operand has 14 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 9 states have internal predecessors, (25), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 8 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-03 02:45:53,713 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:45:54,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:45:54,089 INFO L93 Difference]: Finished difference Result 120 states and 136 transitions. [2022-11-03 02:45:54,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-03 02:45:54,090 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 9 states have internal predecessors, (25), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 8 states have call predecessors, (12), 4 states have call successors, (12) Word has length 42 [2022-11-03 02:45:54,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:45:54,091 INFO L225 Difference]: With dead ends: 120 [2022-11-03 02:45:54,091 INFO L226 Difference]: Without dead ends: 108 [2022-11-03 02:45:54,092 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 95 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=131, Invalid=861, Unknown=0, NotChecked=0, Total=992 [2022-11-03 02:45:54,093 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 31 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 280 mSolverCounterSat, 37 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 280 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2022-11-03 02:45:54,093 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 90 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 280 Invalid, 1 Unknown, 0 Unchecked, 2.7s Time] [2022-11-03 02:45:54,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2022-11-03 02:45:54,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 100. [2022-11-03 02:45:54,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 62 states have (on average 1.0806451612903225) internal successors, (67), 64 states have internal predecessors, (67), 22 states have call successors, (22), 16 states have call predecessors, (22), 15 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2022-11-03 02:45:54,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 108 transitions. [2022-11-03 02:45:54,115 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 108 transitions. Word has length 42 [2022-11-03 02:45:54,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:45:54,115 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 108 transitions. [2022-11-03 02:45:54,115 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 9 states have internal predecessors, (25), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 8 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-03 02:45:54,116 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 108 transitions. [2022-11-03 02:45:54,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-11-03 02:45:54,119 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:45:54,120 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:45:54,145 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-03 02:45:54,327 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:45:54,327 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:45:54,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:45:54,327 INFO L85 PathProgramCache]: Analyzing trace with hash -1884634751, now seen corresponding path program 1 times [2022-11-03 02:45:54,328 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:45:54,328 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1601523468] [2022-11-03 02:45:54,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:45:54,328 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:45:54,336 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:45:54,336 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1998128059] [2022-11-03 02:45:54,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:45:54,336 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:45:54,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:45:54,337 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:45:54,383 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-03 02:45:54,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:45:54,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-03 02:45:54,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:45:54,484 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 27 proven. 7 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2022-11-03 02:45:54,485 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:45:54,599 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 27 proven. 7 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2022-11-03 02:45:54,599 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:45:54,599 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1601523468] [2022-11-03 02:45:54,599 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:45:54,599 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1998128059] [2022-11-03 02:45:54,600 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1998128059] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:45:54,600 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [598173757] [2022-11-03 02:45:54,602 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-03 02:45:54,602 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:45:54,602 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:45:54,602 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:45:54,602 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:45:57,106 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-03 02:45:57,114 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-03 02:45:57,135 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:46:08,145 WARN L234 SmtUtils]: Spent 8.65s on a formula simplification. DAG size of input: 61 DAG size of output: 54 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-03 02:46:08,923 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4025#(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 [2022-11-03 02:46:08,923 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:46:08,923 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:46:08,923 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2022-11-03 02:46:08,923 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1348997763] [2022-11-03 02:46:08,923 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:46:08,924 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-03 02:46:08,924 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:46:08,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-03 02:46:08,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=506, Unknown=0, NotChecked=0, Total=600 [2022-11-03 02:46:08,925 INFO L87 Difference]: Start difference. First operand 100 states and 108 transitions. Second operand has 9 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2022-11-03 02:46:09,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:46:09,182 INFO L93 Difference]: Finished difference Result 106 states and 113 transitions. [2022-11-03 02:46:09,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-03 02:46:09,182 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 53 [2022-11-03 02:46:09,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:46:09,183 INFO L225 Difference]: With dead ends: 106 [2022-11-03 02:46:09,183 INFO L226 Difference]: Without dead ends: 86 [2022-11-03 02:46:09,184 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 131 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 11.9s TimeCoverageRelationStatistics Valid=113, Invalid=643, Unknown=0, NotChecked=0, Total=756 [2022-11-03 02:46:09,185 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 12 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:46:09,185 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 74 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:46:09,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-11-03 02:46:09,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2022-11-03 02:46:09,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 54 states have (on average 1.037037037037037) internal successors, (56), 55 states have internal predecessors, (56), 18 states have call successors, (18), 13 states have call predecessors, (18), 13 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2022-11-03 02:46:09,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 91 transitions. [2022-11-03 02:46:09,206 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 91 transitions. Word has length 53 [2022-11-03 02:46:09,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:46:09,206 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 91 transitions. [2022-11-03 02:46:09,206 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2022-11-03 02:46:09,207 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 91 transitions. [2022-11-03 02:46:09,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-11-03 02:46:09,208 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:46:09,208 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:46:09,231 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-03 02:46:09,411 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:46:09,411 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:46:09,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:46:09,412 INFO L85 PathProgramCache]: Analyzing trace with hash -1445886962, now seen corresponding path program 4 times [2022-11-03 02:46:09,412 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:46:09,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1882978037] [2022-11-03 02:46:09,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:46:09,412 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:46:09,430 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:46:09,430 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [840640531] [2022-11-03 02:46:09,431 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:46:09,431 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:46:09,431 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:46:09,432 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:46:09,451 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-03 02:46:09,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:46:09,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 49 conjunts are in the unsatisfiable core [2022-11-03 02:46:09,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:46:12,471 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 50 proven. 72 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2022-11-03 02:46:12,472 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:46:13,016 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 76 proven. 8 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2022-11-03 02:46:13,016 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:46:13,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1882978037] [2022-11-03 02:46:13,016 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:46:13,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [840640531] [2022-11-03 02:46:13,017 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [840640531] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:46:13,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [801852920] [2022-11-03 02:46:13,019 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-03 02:46:13,019 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:46:13,019 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:46:13,019 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:46:13,020 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:46:15,057 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-03 02:46:15,061 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-03 02:46:15,085 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:46:17,825 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4765#(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 [2022-11-03 02:46:17,825 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:46:17,825 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:46:17,825 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 14 [2022-11-03 02:46:17,826 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1349274676] [2022-11-03 02:46:17,826 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:46:17,826 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-03 02:46:17,826 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:46:17,827 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-03 02:46:17,827 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=702, Unknown=0, NotChecked=0, Total=812 [2022-11-03 02:46:17,827 INFO L87 Difference]: Start difference. First operand 86 states and 91 transitions. Second operand has 14 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 11 states have internal predecessors, (32), 7 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (18), 8 states have call predecessors, (18), 7 states have call successors, (18) [2022-11-03 02:46:22,395 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:46:22,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:46:22,396 INFO L93 Difference]: Finished difference Result 96 states and 103 transitions. [2022-11-03 02:46:22,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-03 02:46:22,400 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 11 states have internal predecessors, (32), 7 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (18), 8 states have call predecessors, (18), 7 states have call successors, (18) Word has length 73 [2022-11-03 02:46:22,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:46:22,401 INFO L225 Difference]: With dead ends: 96 [2022-11-03 02:46:22,401 INFO L226 Difference]: Without dead ends: 94 [2022-11-03 02:46:22,402 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 184 SyntacticMatches, 7 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=140, Invalid=916, Unknown=0, NotChecked=0, Total=1056 [2022-11-03 02:46:22,403 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 37 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 54 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 323 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:46:22,403 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 117 Invalid, 323 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 268 Invalid, 1 Unknown, 0 Unchecked, 3.3s Time] [2022-11-03 02:46:22,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-11-03 02:46:22,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 90. [2022-11-03 02:46:22,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 57 states have (on average 1.0350877192982457) internal successors, (59), 58 states have internal predecessors, (59), 18 states have call successors, (18), 14 states have call predecessors, (18), 14 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2022-11-03 02:46:22,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 94 transitions. [2022-11-03 02:46:22,422 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 94 transitions. Word has length 73 [2022-11-03 02:46:22,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:46:22,423 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 94 transitions. [2022-11-03 02:46:22,423 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 11 states have internal predecessors, (32), 7 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (18), 8 states have call predecessors, (18), 7 states have call successors, (18) [2022-11-03 02:46:22,423 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 94 transitions. [2022-11-03 02:46:22,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2022-11-03 02:46:22,424 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:46:22,424 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:46:22,453 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-03 02:46:22,625 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-03 02:46:22,625 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:46:22,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:46:22,625 INFO L85 PathProgramCache]: Analyzing trace with hash -1678794748, now seen corresponding path program 2 times [2022-11-03 02:46:22,626 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:46:22,626 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [653514624] [2022-11-03 02:46:22,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:46:22,626 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:46:22,651 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:46:22,660 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1181828562] [2022-11-03 02:46:22,661 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:46:22,661 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:46:22,661 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:46:22,662 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:46:22,691 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-03 02:46:22,768 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-03 02:46:22,768 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:46:22,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-03 02:46:22,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:46:22,936 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 24 proven. 260 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2022-11-03 02:46:22,938 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:46:23,090 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 24 proven. 44 refuted. 0 times theorem prover too weak. 266 trivial. 0 not checked. [2022-11-03 02:46:23,090 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:46:23,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [653514624] [2022-11-03 02:46:23,091 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:46:23,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1181828562] [2022-11-03 02:46:23,091 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1181828562] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:46:23,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [148837032] [2022-11-03 02:46:23,093 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-03 02:46:23,093 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:46:23,093 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:46:23,093 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:46:23,094 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:46:25,070 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-03 02:46:25,075 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-03 02:46:25,095 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:46:27,094 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5576#(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 [2022-11-03 02:46:27,094 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:46:27,094 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:46:27,094 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2022-11-03 02:46:27,095 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [9117713] [2022-11-03 02:46:27,095 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:46:27,095 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-03 02:46:27,095 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:46:27,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-03 02:46:27,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=688, Unknown=0, NotChecked=0, Total=870 [2022-11-03 02:46:27,097 INFO L87 Difference]: Start difference. First operand 90 states and 94 transitions. Second operand has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 11 states have call successors, (29), 7 states have call predecessors, (29), 6 states have return successors, (28), 10 states have call predecessors, (28), 10 states have call successors, (28) [2022-11-03 02:46:27,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:46:27,520 INFO L93 Difference]: Finished difference Result 212 states and 223 transitions. [2022-11-03 02:46:27,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-03 02:46:27,521 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 11 states have call successors, (29), 7 states have call predecessors, (29), 6 states have return successors, (28), 10 states have call predecessors, (28), 10 states have call successors, (28) Word has length 86 [2022-11-03 02:46:27,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:46:27,523 INFO L225 Difference]: With dead ends: 212 [2022-11-03 02:46:27,523 INFO L226 Difference]: Without dead ends: 198 [2022-11-03 02:46:27,524 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 228 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=295, Invalid=1187, Unknown=0, NotChecked=0, Total=1482 [2022-11-03 02:46:27,525 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 93 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 227 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:46:27,525 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [93 Valid, 223 Invalid, 227 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 140 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 02:46:27,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2022-11-03 02:46:27,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 198. [2022-11-03 02:46:27,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 198 states, 129 states have (on average 1.0155038759689923) internal successors, (131), 130 states have internal predecessors, (131), 36 states have call successors, (36), 32 states have call predecessors, (36), 32 states have return successors, (35), 35 states have call predecessors, (35), 35 states have call successors, (35) [2022-11-03 02:46:27,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 202 transitions. [2022-11-03 02:46:27,568 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 202 transitions. Word has length 86 [2022-11-03 02:46:27,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:46:27,569 INFO L495 AbstractCegarLoop]: Abstraction has 198 states and 202 transitions. [2022-11-03 02:46:27,569 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 11 states have call successors, (29), 7 states have call predecessors, (29), 6 states have return successors, (28), 10 states have call predecessors, (28), 10 states have call successors, (28) [2022-11-03 02:46:27,569 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 202 transitions. [2022-11-03 02:46:27,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2022-11-03 02:46:27,572 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:46:27,572 INFO L195 NwaCegarLoop]: trace histogram [31, 30, 30, 11, 10, 10, 10, 10, 10, 10, 10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:46:27,594 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-03 02:46:27,773 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-03 02:46:27,773 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:46:27,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:46:27,774 INFO L85 PathProgramCache]: Analyzing trace with hash -926531660, now seen corresponding path program 3 times [2022-11-03 02:46:27,774 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:46:27,774 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2086619865] [2022-11-03 02:46:27,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:46:27,774 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:46:27,789 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:46:27,789 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1957017813] [2022-11-03 02:46:27,789 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:46:27,790 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:46:27,790 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:46:27,791 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:46:27,819 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-03 02:46:27,936 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:46:27,936 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:46:27,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 413 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-03 02:46:27,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:46:28,278 INFO L134 CoverageAnalysis]: Checked inductivity of 2092 backedges. 60 proven. 1910 refuted. 0 times theorem prover too weak. 122 trivial. 0 not checked. [2022-11-03 02:46:28,279 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:46:28,629 INFO L134 CoverageAnalysis]: Checked inductivity of 2092 backedges. 60 proven. 290 refuted. 0 times theorem prover too weak. 1742 trivial. 0 not checked. [2022-11-03 02:46:28,629 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:46:28,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2086619865] [2022-11-03 02:46:28,630 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:46:28,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1957017813] [2022-11-03 02:46:28,630 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1957017813] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:46:28,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [253963984] [2022-11-03 02:46:28,632 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-03 02:46:28,632 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:46:28,632 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:46:28,633 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:46:28,633 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:46:30,577 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-03 02:46:30,581 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-03 02:46:30,605 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:46:32,740 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7368#(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 [2022-11-03 02:46:32,740 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:46:32,740 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:46:32,740 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 26 [2022-11-03 02:46:32,742 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [910616732] [2022-11-03 02:46:32,742 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:46:32,743 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-03 02:46:32,743 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:46:32,743 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-03 02:46:32,744 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=452, Invalid=1270, Unknown=0, NotChecked=0, Total=1722 [2022-11-03 02:46:32,745 INFO L87 Difference]: Start difference. First operand 198 states and 202 transitions. Second operand has 26 states, 26 states have (on average 4.076923076923077) internal successors, (106), 26 states have internal predecessors, (106), 23 states have call successors, (65), 13 states have call predecessors, (65), 12 states have return successors, (64), 22 states have call predecessors, (64), 22 states have call successors, (64) [2022-11-03 02:46:33,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:46:33,792 INFO L93 Difference]: Finished difference Result 428 states and 445 transitions. [2022-11-03 02:46:33,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-11-03 02:46:33,792 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 4.076923076923077) internal successors, (106), 26 states have internal predecessors, (106), 23 states have call successors, (65), 13 states have call predecessors, (65), 12 states have return successors, (64), 22 states have call predecessors, (64), 22 states have call successors, (64) Word has length 194 [2022-11-03 02:46:33,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:46:33,794 INFO L225 Difference]: With dead ends: 428 [2022-11-03 02:46:33,795 INFO L226 Difference]: Without dead ends: 414 [2022-11-03 02:46:33,796 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 540 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1211 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=967, Invalid=2939, Unknown=0, NotChecked=0, Total=3906 [2022-11-03 02:46:33,797 INFO L413 NwaCegarLoop]: 87 mSDtfsCounter, 214 mSDsluCounter, 231 mSDsCounter, 0 mSdLazyCounter, 366 mSolverCounterSat, 189 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 214 SdHoareTripleChecker+Valid, 294 SdHoareTripleChecker+Invalid, 555 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 189 IncrementalHoareTripleChecker+Valid, 366 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-03 02:46:33,797 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [214 Valid, 294 Invalid, 555 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [189 Valid, 366 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-03 02:46:33,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 414 states. [2022-11-03 02:46:33,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 414 to 414. [2022-11-03 02:46:33,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 414 states, 273 states have (on average 1.0073260073260073) internal successors, (275), 274 states have internal predecessors, (275), 72 states have call successors, (72), 68 states have call predecessors, (72), 68 states have return successors, (71), 71 states have call predecessors, (71), 71 states have call successors, (71) [2022-11-03 02:46:33,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 414 states to 414 states and 418 transitions. [2022-11-03 02:46:33,879 INFO L78 Accepts]: Start accepts. Automaton has 414 states and 418 transitions. Word has length 194 [2022-11-03 02:46:33,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:46:33,880 INFO L495 AbstractCegarLoop]: Abstraction has 414 states and 418 transitions. [2022-11-03 02:46:33,880 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 4.076923076923077) internal successors, (106), 26 states have internal predecessors, (106), 23 states have call successors, (65), 13 states have call predecessors, (65), 12 states have return successors, (64), 22 states have call predecessors, (64), 22 states have call successors, (64) [2022-11-03 02:46:33,881 INFO L276 IsEmpty]: Start isEmpty. Operand 414 states and 418 transitions. [2022-11-03 02:46:33,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 411 [2022-11-03 02:46:33,889 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:46:33,889 INFO L195 NwaCegarLoop]: trace histogram [67, 66, 66, 23, 22, 22, 22, 22, 22, 22, 22, 22, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:46:33,929 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-03 02:46:34,103 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:46:34,103 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:46:34,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:46:34,103 INFO L85 PathProgramCache]: Analyzing trace with hash 1144563476, now seen corresponding path program 4 times [2022-11-03 02:46:34,104 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:46:34,104 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1471729104] [2022-11-03 02:46:34,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:46:34,104 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:46:34,129 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:46:34,130 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1579870209] [2022-11-03 02:46:34,130 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:46:34,130 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:46:34,130 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:46:34,131 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:46:34,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-03 02:46:34,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:46:34,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 821 conjuncts, 47 conjunts are in the unsatisfiable core [2022-11-03 02:46:34,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:46:35,107 INFO L134 CoverageAnalysis]: Checked inductivity of 10144 backedges. 132 proven. 9746 refuted. 0 times theorem prover too weak. 266 trivial. 0 not checked. [2022-11-03 02:46:35,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:46:36,341 INFO L134 CoverageAnalysis]: Checked inductivity of 10144 backedges. 132 proven. 1430 refuted. 0 times theorem prover too weak. 8582 trivial. 0 not checked. [2022-11-03 02:46:36,342 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:46:36,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1471729104] [2022-11-03 02:46:36,342 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:46:36,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1579870209] [2022-11-03 02:46:36,342 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1579870209] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:46:36,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1713831114] [2022-11-03 02:46:36,344 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-03 02:46:36,344 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:46:36,345 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:46:36,345 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:46:36,345 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:46:38,305 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-03 02:46:38,309 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-03 02:46:38,330 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:46:40,770 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11104#(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 [2022-11-03 02:46:40,770 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:46:40,770 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:46:40,771 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 26] total 50 [2022-11-03 02:46:40,771 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278639745] [2022-11-03 02:46:40,771 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:46:40,772 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-03 02:46:40,772 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:46:40,773 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-03 02:46:40,775 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1424, Invalid=2866, Unknown=0, NotChecked=0, Total=4290 [2022-11-03 02:46:40,776 INFO L87 Difference]: Start difference. First operand 414 states and 418 transitions. Second operand has 50 states, 50 states have (on average 4.28) internal successors, (214), 50 states have internal predecessors, (214), 47 states have call successors, (137), 25 states have call predecessors, (137), 24 states have return successors, (136), 46 states have call predecessors, (136), 46 states have call successors, (136) [2022-11-03 02:46:43,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:46:43,448 INFO L93 Difference]: Finished difference Result 860 states and 889 transitions. [2022-11-03 02:46:43,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2022-11-03 02:46:43,449 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 4.28) internal successors, (214), 50 states have internal predecessors, (214), 47 states have call successors, (137), 25 states have call predecessors, (137), 24 states have return successors, (136), 46 states have call predecessors, (136), 46 states have call successors, (136) Word has length 410 [2022-11-03 02:46:43,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:46:43,454 INFO L225 Difference]: With dead ends: 860 [2022-11-03 02:46:43,454 INFO L226 Difference]: Without dead ends: 846 [2022-11-03 02:46:43,458 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1273 GetRequests, 1164 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3161 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=3607, Invalid=8603, Unknown=0, NotChecked=0, Total=12210 [2022-11-03 02:46:43,458 INFO L413 NwaCegarLoop]: 159 mSDtfsCounter, 383 mSDsluCounter, 386 mSDsCounter, 0 mSdLazyCounter, 768 mSolverCounterSat, 350 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 383 SdHoareTripleChecker+Valid, 497 SdHoareTripleChecker+Invalid, 1118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 350 IncrementalHoareTripleChecker+Valid, 768 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:46:43,459 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [383 Valid, 497 Invalid, 1118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [350 Valid, 768 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-03 02:46:43,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 846 states. [2022-11-03 02:46:43,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 846 to 846. [2022-11-03 02:46:43,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 846 states, 561 states have (on average 1.0035650623885919) internal successors, (563), 562 states have internal predecessors, (563), 144 states have call successors, (144), 140 states have call predecessors, (144), 140 states have return successors, (143), 143 states have call predecessors, (143), 143 states have call successors, (143) [2022-11-03 02:46:43,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 846 states to 846 states and 850 transitions. [2022-11-03 02:46:43,637 INFO L78 Accepts]: Start accepts. Automaton has 846 states and 850 transitions. Word has length 410 [2022-11-03 02:46:43,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:46:43,638 INFO L495 AbstractCegarLoop]: Abstraction has 846 states and 850 transitions. [2022-11-03 02:46:43,639 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 4.28) internal successors, (214), 50 states have internal predecessors, (214), 47 states have call successors, (137), 25 states have call predecessors, (137), 24 states have return successors, (136), 46 states have call predecessors, (136), 46 states have call successors, (136) [2022-11-03 02:46:43,639 INFO L276 IsEmpty]: Start isEmpty. Operand 846 states and 850 transitions. [2022-11-03 02:46:43,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 843 [2022-11-03 02:46:43,668 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:46:43,669 INFO L195 NwaCegarLoop]: trace histogram [139, 138, 138, 47, 46, 46, 46, 46, 46, 46, 46, 46, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:46:43,703 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-03 02:46:43,891 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-03 02:46:43,891 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:46:43,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:46:43,892 INFO L85 PathProgramCache]: Analyzing trace with hash -478013996, now seen corresponding path program 5 times [2022-11-03 02:46:43,892 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:46:43,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1131803876] [2022-11-03 02:46:43,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:46:43,892 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:46:43,934 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:46:43,934 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [466402957] [2022-11-03 02:46:43,934 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:46:43,935 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:46:43,935 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:46:43,936 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:46:43,942 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_961e4187-710e-488c-a16f-8f945ca7d43d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process