./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/divbin_unwindbound20.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version b5237d83 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/divbin_unwindbound20.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba --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 7e073a4c36b82f2b6062e496bb836cd3d16667ec7228f4ab2b6689e74fa81265 --- 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-b5237d8 [2022-11-22 01:20:43,971 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-22 01:20:43,973 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-22 01:20:44,003 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-22 01:20:44,006 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-22 01:20:44,010 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-22 01:20:44,015 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-22 01:20:44,019 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-22 01:20:44,021 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-22 01:20:44,027 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-22 01:20:44,029 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-22 01:20:44,032 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-22 01:20:44,032 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-22 01:20:44,036 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-22 01:20:44,038 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-22 01:20:44,042 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-22 01:20:44,044 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-22 01:20:44,045 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-22 01:20:44,047 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-22 01:20:44,055 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-22 01:20:44,056 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-22 01:20:44,059 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-22 01:20:44,060 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-22 01:20:44,061 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-22 01:20:44,073 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-22 01:20:44,074 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-22 01:20:44,074 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-22 01:20:44,076 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-22 01:20:44,077 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-22 01:20:44,078 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-22 01:20:44,079 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-22 01:20:44,080 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-22 01:20:44,082 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-22 01:20:44,084 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-22 01:20:44,086 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-22 01:20:44,086 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-22 01:20:44,087 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-22 01:20:44,088 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-22 01:20:44,088 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-22 01:20:44,090 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-22 01:20:44,090 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-22 01:20:44,091 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-22 01:20:44,139 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-22 01:20:44,139 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-22 01:20:44,140 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-22 01:20:44,141 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-22 01:20:44,142 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-22 01:20:44,142 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-22 01:20:44,142 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-22 01:20:44,142 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-22 01:20:44,143 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-22 01:20:44,143 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-22 01:20:44,144 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-22 01:20:44,145 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-22 01:20:44,145 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-22 01:20:44,145 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-22 01:20:44,145 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-22 01:20:44,146 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-22 01:20:44,146 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-22 01:20:44,146 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-22 01:20:44,147 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-22 01:20:44,147 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-22 01:20:44,148 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-22 01:20:44,148 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-22 01:20:44,148 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-22 01:20:44,149 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-22 01:20:44,149 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-22 01:20:44,149 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-22 01:20:44,150 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-22 01:20:44,150 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-22 01:20:44,150 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-22 01:20:44,151 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-22 01:20:44,151 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-22 01:20:44,151 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-22 01:20:44,152 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 01:20:44,152 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-22 01:20:44,152 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-22 01:20:44,153 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-22 01:20:44,153 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-22 01:20:44,153 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-22 01:20:44,153 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-22 01:20:44,154 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-22 01:20:44,154 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-22 01:20:44,155 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_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7e073a4c36b82f2b6062e496bb836cd3d16667ec7228f4ab2b6689e74fa81265 [2022-11-22 01:20:44,456 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-22 01:20:44,490 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-22 01:20:44,493 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-22 01:20:44,495 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-22 01:20:44,495 INFO L275 PluginConnector]: CDTParser initialized [2022-11-22 01:20:44,497 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/../../sv-benchmarks/c/nla-digbench-scaling/divbin_unwindbound20.i [2022-11-22 01:20:47,650 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-22 01:20:47,839 INFO L351 CDTParser]: Found 1 translation units. [2022-11-22 01:20:47,840 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/sv-benchmarks/c/nla-digbench-scaling/divbin_unwindbound20.i [2022-11-22 01:20:47,846 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/data/1b3d36773/157a082713b84980ac5ab2d467c47447/FLAGaf42c066d [2022-11-22 01:20:47,863 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/data/1b3d36773/157a082713b84980ac5ab2d467c47447 [2022-11-22 01:20:47,866 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-22 01:20:47,867 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-22 01:20:47,869 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-22 01:20:47,869 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-22 01:20:47,873 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-22 01:20:47,874 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:20:47" (1/1) ... [2022-11-22 01:20:47,876 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@58afbabb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:20:47, skipping insertion in model container [2022-11-22 01:20:47,876 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:20:47" (1/1) ... [2022-11-22 01:20:47,885 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-22 01:20:47,901 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-22 01:20:48,090 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/sv-benchmarks/c/nla-digbench-scaling/divbin_unwindbound20.i[950,963] [2022-11-22 01:20:48,107 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 01:20:48,117 INFO L203 MainTranslator]: Completed pre-run [2022-11-22 01:20:48,131 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/sv-benchmarks/c/nla-digbench-scaling/divbin_unwindbound20.i[950,963] [2022-11-22 01:20:48,147 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 01:20:48,162 INFO L208 MainTranslator]: Completed translation [2022-11-22 01:20:48,163 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:20:48 WrapperNode [2022-11-22 01:20:48,163 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-22 01:20:48,164 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-22 01:20:48,165 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-22 01:20:48,165 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-22 01:20:48,173 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:20:48" (1/1) ... [2022-11-22 01:20:48,181 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:20:48" (1/1) ... [2022-11-22 01:20:48,200 INFO L138 Inliner]: procedures = 16, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 54 [2022-11-22 01:20:48,201 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-22 01:20:48,202 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-22 01:20:48,202 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-22 01:20:48,202 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-22 01:20:48,212 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:20:48" (1/1) ... [2022-11-22 01:20:48,212 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:20:48" (1/1) ... [2022-11-22 01:20:48,214 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:20:48" (1/1) ... [2022-11-22 01:20:48,214 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:20:48" (1/1) ... [2022-11-22 01:20:48,226 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:20:48" (1/1) ... [2022-11-22 01:20:48,233 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:20:48" (1/1) ... [2022-11-22 01:20:48,235 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:20:48" (1/1) ... [2022-11-22 01:20:48,237 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:20:48" (1/1) ... [2022-11-22 01:20:48,238 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-22 01:20:48,239 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-22 01:20:48,239 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-22 01:20:48,240 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-22 01:20:48,241 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:20:48" (1/1) ... [2022-11-22 01:20:48,248 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 01:20:48,259 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:20:48,272 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-22 01:20:48,274 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-22 01:20:48,318 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-22 01:20:48,318 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-22 01:20:48,318 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-22 01:20:48,318 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-22 01:20:48,319 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-22 01:20:48,319 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-22 01:20:48,319 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-22 01:20:48,319 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-22 01:20:48,387 INFO L235 CfgBuilder]: Building ICFG [2022-11-22 01:20:48,390 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-22 01:20:48,536 INFO L276 CfgBuilder]: Performing block encoding [2022-11-22 01:20:48,572 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-22 01:20:48,572 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-22 01:20:48,575 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:20:48 BoogieIcfgContainer [2022-11-22 01:20:48,575 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-22 01:20:48,577 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-22 01:20:48,578 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-22 01:20:48,581 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-22 01:20:48,581 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 01:20:47" (1/3) ... [2022-11-22 01:20:48,582 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@143ea14a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:20:48, skipping insertion in model container [2022-11-22 01:20:48,582 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:20:48" (2/3) ... [2022-11-22 01:20:48,583 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@143ea14a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:20:48, skipping insertion in model container [2022-11-22 01:20:48,583 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:20:48" (3/3) ... [2022-11-22 01:20:48,591 INFO L112 eAbstractionObserver]: Analyzing ICFG divbin_unwindbound20.i [2022-11-22 01:20:48,628 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-22 01:20:48,628 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-22 01:20:48,693 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-22 01:20:48,720 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;@65184679, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-22 01:20:48,720 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-22 01:20:48,740 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 15 states have internal predecessors, (22), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-22 01:20:48,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-22 01:20:48,747 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:20:48,748 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:20:48,748 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:20:48,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:20:48,767 INFO L85 PathProgramCache]: Analyzing trace with hash -1734137638, now seen corresponding path program 1 times [2022-11-22 01:20:48,777 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:20:48,777 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1807740327] [2022-11-22 01:20:48,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:20:48,778 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:20:49,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:20:49,053 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:20:49,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1807740327] [2022-11-22 01:20:49,056 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-22 01:20:49,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1870607526] [2022-11-22 01:20:49,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:20:49,058 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:20:49,059 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:20:49,066 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:20:49,102 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-22 01:20:49,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:20:49,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-22 01:20:49,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:20:49,196 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 01:20:49,196 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 01:20:49,197 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1870607526] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:20:49,198 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 01:20:49,198 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-22 01:20:49,201 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [220814141] [2022-11-22 01:20:49,201 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:20:49,206 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-22 01:20:49,207 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:20:49,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-22 01:20:49,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-22 01:20:49,251 INFO L87 Difference]: Start difference. First operand has 22 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 15 states have internal predecessors, (22), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 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) [2022-11-22 01:20:49,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:20:49,303 INFO L93 Difference]: Finished difference Result 35 states and 49 transitions. [2022-11-22 01:20:49,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-22 01:20:49,308 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 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 [2022-11-22 01:20:49,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:20:49,321 INFO L225 Difference]: With dead ends: 35 [2022-11-22 01:20:49,322 INFO L226 Difference]: Without dead ends: 20 [2022-11-22 01:20:49,326 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-22 01:20:49,331 INFO L413 NwaCegarLoop]: 23 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, 23 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 [2022-11-22 01:20:49,333 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 01:20:49,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-22 01:20:49,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-11-22 01:20:49,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-22 01:20:49,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 25 transitions. [2022-11-22 01:20:49,382 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 25 transitions. Word has length 14 [2022-11-22 01:20:49,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:20:49,385 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 25 transitions. [2022-11-22 01:20:49,386 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 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) [2022-11-22 01:20:49,386 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 25 transitions. [2022-11-22 01:20:49,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-22 01:20:49,390 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:20:49,390 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:20:49,402 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-22 01:20:49,596 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-22 01:20:49,598 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:20:49,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:20:49,602 INFO L85 PathProgramCache]: Analyzing trace with hash -207211284, now seen corresponding path program 1 times [2022-11-22 01:20:49,602 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:20:49,602 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [852988154] [2022-11-22 01:20:49,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:20:49,603 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:20:49,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:20:49,676 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:20:49,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [852988154] [2022-11-22 01:20:49,678 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-22 01:20:49,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1996410166] [2022-11-22 01:20:49,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:20:49,680 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:20:49,681 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:20:49,682 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:20:49,716 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-22 01:20:49,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:20:49,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-22 01:20:49,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:20:49,848 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 01:20:49,849 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 01:20:49,849 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1996410166] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:20:49,849 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 01:20:49,849 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-22 01:20:49,850 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [762674574] [2022-11-22 01:20:49,850 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:20:49,851 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-22 01:20:49,851 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:20:49,852 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-22 01:20:49,852 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-22 01:20:49,852 INFO L87 Difference]: Start difference. First operand 20 states and 25 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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) [2022-11-22 01:20:49,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:20:49,882 INFO L93 Difference]: Finished difference Result 33 states and 41 transitions. [2022-11-22 01:20:49,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-22 01:20:49,883 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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 16 [2022-11-22 01:20:49,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:20:49,884 INFO L225 Difference]: With dead ends: 33 [2022-11-22 01:20:49,884 INFO L226 Difference]: Without dead ends: 22 [2022-11-22 01:20:49,885 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-22 01:20:49,886 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 0 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 01:20:49,886 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 53 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 01:20:49,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-11-22 01:20:49,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-11-22 01:20:49,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 16 states have internal predecessors, (20), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-22 01:20:49,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2022-11-22 01:20:49,893 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 16 [2022-11-22 01:20:49,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:20:49,893 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2022-11-22 01:20:49,893 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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) [2022-11-22 01:20:49,894 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2022-11-22 01:20:49,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-11-22 01:20:49,894 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:20:49,894 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:20:49,908 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-11-22 01:20:50,099 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:20:50,100 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:20:50,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:20:50,101 INFO L85 PathProgramCache]: Analyzing trace with hash 1776102932, now seen corresponding path program 1 times [2022-11-22 01:20:50,101 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:20:50,101 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [114490661] [2022-11-22 01:20:50,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:20:50,102 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:20:50,119 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:20:50,120 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1172400756] [2022-11-22 01:20:50,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:20:50,120 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:20:50,120 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:20:50,121 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:20:50,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-22 01:20:50,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:20:50,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-22 01:20:50,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:20:50,419 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 01:20:50,419 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 01:20:50,420 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:20:50,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [114490661] [2022-11-22 01:20:50,420 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:20:50,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1172400756] [2022-11-22 01:20:50,420 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1172400756] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:20:50,421 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 01:20:50,421 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-11-22 01:20:50,421 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1935845284] [2022-11-22 01:20:50,421 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:20:50,422 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-22 01:20:50,422 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:20:50,422 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-22 01:20:50,423 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2022-11-22 01:20:50,423 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 9 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-22 01:20:50,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:20:50,602 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2022-11-22 01:20:50,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-22 01:20:50,603 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 17 [2022-11-22 01:20:50,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:20:50,605 INFO L225 Difference]: With dead ends: 34 [2022-11-22 01:20:50,605 INFO L226 Difference]: Without dead ends: 31 [2022-11-22 01:20:50,605 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2022-11-22 01:20:50,607 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 30 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:20:50,607 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 74 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:20:50,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-11-22 01:20:50,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-11-22 01:20:50,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 23 states have internal predecessors, (28), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-22 01:20:50,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 37 transitions. [2022-11-22 01:20:50,617 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 37 transitions. Word has length 17 [2022-11-22 01:20:50,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:20:50,617 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 37 transitions. [2022-11-22 01:20:50,618 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-22 01:20:50,618 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 37 transitions. [2022-11-22 01:20:50,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-22 01:20:50,619 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:20:50,619 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:20:50,628 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-22 01:20:50,824 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-11-22 01:20:50,825 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:20:50,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:20:50,825 INFO L85 PathProgramCache]: Analyzing trace with hash 1737998361, now seen corresponding path program 1 times [2022-11-22 01:20:50,825 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:20:50,826 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [60050049] [2022-11-22 01:20:50,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:20:50,826 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:20:50,866 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:20:50,866 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2143740363] [2022-11-22 01:20:50,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:20:50,867 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:20:50,867 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:20:50,871 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:20:50,899 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-22 01:20:50,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:20:50,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-22 01:20:50,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:20:50,986 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 01:20:50,987 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:20:51,058 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 01:20:51,058 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:20:51,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [60050049] [2022-11-22 01:20:51,059 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:20:51,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2143740363] [2022-11-22 01:20:51,059 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2143740363] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:20:51,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [983556913] [2022-11-22 01:20:51,090 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-22 01:20:51,091 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:20:51,094 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:20:51,098 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:20:51,099 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:20:51,541 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 62 for LOIs [2022-11-22 01:20:51,582 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:20:52,166 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [983556913] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:20:52,166 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-22 01:20:52,166 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [4, 5] total 18 [2022-11-22 01:20:52,167 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077364373] [2022-11-22 01:20:52,167 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:20:52,168 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-22 01:20:52,168 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:20:52,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-22 01:20:52,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=232, Unknown=0, NotChecked=0, Total=306 [2022-11-22 01:20:52,169 INFO L87 Difference]: Start difference. First operand 31 states and 37 transitions. Second operand has 12 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-22 01:20:52,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:20:52,381 INFO L93 Difference]: Finished difference Result 50 states and 62 transitions. [2022-11-22 01:20:52,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-22 01:20:52,384 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 19 [2022-11-22 01:20:52,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:20:52,385 INFO L225 Difference]: With dead ends: 50 [2022-11-22 01:20:52,385 INFO L226 Difference]: Without dead ends: 39 [2022-11-22 01:20:52,385 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=84, Invalid=258, Unknown=0, NotChecked=0, Total=342 [2022-11-22 01:20:52,386 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 21 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:20:52,387 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 56 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:20:52,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-11-22 01:20:52,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 33. [2022-11-22 01:20:52,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 24 states have (on average 1.25) internal successors, (30), 25 states have internal predecessors, (30), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-22 01:20:52,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 39 transitions. [2022-11-22 01:20:52,397 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 39 transitions. Word has length 19 [2022-11-22 01:20:52,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:20:52,398 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 39 transitions. [2022-11-22 01:20:52,398 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-22 01:20:52,398 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 39 transitions. [2022-11-22 01:20:52,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-22 01:20:52,399 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:20:52,399 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:20:52,412 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-22 01:20:52,604 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:20:52,605 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:20:52,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:20:52,606 INFO L85 PathProgramCache]: Analyzing trace with hash 1736210901, now seen corresponding path program 1 times [2022-11-22 01:20:52,606 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:20:52,606 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [907719126] [2022-11-22 01:20:52,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:20:52,606 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:20:52,632 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:20:52,632 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [154907326] [2022-11-22 01:20:52,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:20:52,632 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:20:52,633 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:20:52,639 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:20:52,641 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-22 01:20:52,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:20:52,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-22 01:20:52,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:20:52,725 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 01:20:52,726 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:20:52,768 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 01:20:52,769 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:20:52,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [907719126] [2022-11-22 01:20:52,771 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:20:52,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [154907326] [2022-11-22 01:20:52,772 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [154907326] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:20:52,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [823538134] [2022-11-22 01:20:52,775 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-22 01:20:52,775 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:20:52,777 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:20:52,777 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:20:52,777 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:20:53,114 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 22 for LOIs [2022-11-22 01:20:53,131 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 62 for LOIs [2022-11-22 01:20:53,164 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:20:53,860 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '783#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 22 ~counter~0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:20:53,860 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:20:53,860 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 01:20:53,860 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2022-11-22 01:20:53,860 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90300523] [2022-11-22 01:20:53,860 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 01:20:53,861 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-22 01:20:53,861 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:20:53,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-22 01:20:53,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=373, Unknown=0, NotChecked=0, Total=462 [2022-11-22 01:20:53,862 INFO L87 Difference]: Start difference. First operand 33 states and 39 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-22 01:20:53,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:20:53,997 INFO L93 Difference]: Finished difference Result 62 states and 74 transitions. [2022-11-22 01:20:53,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-22 01:20:53,998 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 19 [2022-11-22 01:20:53,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:20:54,001 INFO L225 Difference]: With dead ends: 62 [2022-11-22 01:20:54,001 INFO L226 Difference]: Without dead ends: 53 [2022-11-22 01:20:54,003 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=109, Invalid=491, Unknown=0, NotChecked=0, Total=600 [2022-11-22 01:20:54,006 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 37 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:20:54,007 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 107 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:20:54,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-11-22 01:20:54,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 41. [2022-11-22 01:20:54,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 32 states have (on average 1.25) internal successors, (40), 33 states have internal predecessors, (40), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-22 01:20:54,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2022-11-22 01:20:54,026 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 19 [2022-11-22 01:20:54,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:20:54,027 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2022-11-22 01:20:54,027 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-22 01:20:54,027 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2022-11-22 01:20:54,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-22 01:20:54,028 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:20:54,028 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:20:54,040 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-22 01:20:54,234 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:20:54,235 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:20:54,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:20:54,235 INFO L85 PathProgramCache]: Analyzing trace with hash 1948059783, now seen corresponding path program 1 times [2022-11-22 01:20:54,235 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:20:54,235 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1207904252] [2022-11-22 01:20:54,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:20:54,236 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:20:54,250 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:20:54,250 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1727190102] [2022-11-22 01:20:54,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:20:54,250 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:20:54,250 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:20:54,251 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:20:54,264 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-22 01:20:54,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:20:54,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-22 01:20:54,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:20:54,456 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 01:20:54,456 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:20:54,721 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 01:20:54,722 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:20:54,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1207904252] [2022-11-22 01:20:54,722 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:20:54,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1727190102] [2022-11-22 01:20:54,723 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1727190102] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-22 01:20:54,723 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-22 01:20:54,723 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 12 [2022-11-22 01:20:54,723 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173064697] [2022-11-22 01:20:54,724 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:20:54,724 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-22 01:20:54,724 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:20:54,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-22 01:20:54,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2022-11-22 01:20:54,725 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 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) [2022-11-22 01:20:57,717 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [1] [2022-11-22 01:20:59,746 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [1] [2022-11-22 01:21:01,768 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [1] [2022-11-22 01:21:01,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:21:01,816 INFO L93 Difference]: Finished difference Result 52 states and 62 transitions. [2022-11-22 01:21:01,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 01:21:01,817 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 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 20 [2022-11-22 01:21:01,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:21:01,818 INFO L225 Difference]: With dead ends: 52 [2022-11-22 01:21:01,818 INFO L226 Difference]: Without dead ends: 50 [2022-11-22 01:21:01,819 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2022-11-22 01:21:01,819 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 16 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 3 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:21:01,820 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 61 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 34 Invalid, 3 Unknown, 0 Unchecked, 7.1s Time] [2022-11-22 01:21:01,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-22 01:21:01,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 48. [2022-11-22 01:21:01,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 37 states have (on average 1.2432432432432432) internal successors, (46), 39 states have internal predecessors, (46), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-22 01:21:01,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 57 transitions. [2022-11-22 01:21:01,838 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 57 transitions. Word has length 20 [2022-11-22 01:21:01,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:21:01,838 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 57 transitions. [2022-11-22 01:21:01,838 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 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) [2022-11-22 01:21:01,838 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 57 transitions. [2022-11-22 01:21:01,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-22 01:21:01,839 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:21:01,839 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:21:01,871 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-22 01:21:02,045 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:21:02,046 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:21:02,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:21:02,046 INFO L85 PathProgramCache]: Analyzing trace with hash 1946272323, now seen corresponding path program 1 times [2022-11-22 01:21:02,046 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:21:02,046 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [204965483] [2022-11-22 01:21:02,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:21:02,046 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:21:02,055 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:21:02,055 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1638444061] [2022-11-22 01:21:02,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:21:02,055 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:21:02,056 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:21:02,057 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:21:02,090 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-22 01:21:02,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:21:02,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-22 01:21:02,119 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:21:02,166 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 01:21:02,166 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:21:02,242 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 01:21:02,243 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:21:02,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [204965483] [2022-11-22 01:21:02,243 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:21:02,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1638444061] [2022-11-22 01:21:02,243 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1638444061] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:21:02,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2005741653] [2022-11-22 01:21:02,246 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-22 01:21:02,246 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:21:02,246 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:21:02,247 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:21:02,247 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:21:02,541 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2022-11-22 01:21:02,575 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 62 for LOIs [2022-11-22 01:21:02,603 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:21:03,868 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1337#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 21 ~counter~0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:21:03,868 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:21:03,869 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 01:21:03,869 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2022-11-22 01:21:03,869 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1070450246] [2022-11-22 01:21:03,869 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 01:21:03,870 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-22 01:21:03,870 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:21:03,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-22 01:21:03,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=446, Unknown=0, NotChecked=0, Total=552 [2022-11-22 01:21:03,871 INFO L87 Difference]: Start difference. First operand 48 states and 57 transitions. Second operand has 10 states, 10 states have (on average 2.5) internal successors, (25), 10 states have internal predecessors, (25), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-22 01:21:04,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:21:04,090 INFO L93 Difference]: Finished difference Result 120 states and 142 transitions. [2022-11-22 01:21:04,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-22 01:21:04,091 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 10 states have internal predecessors, (25), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 20 [2022-11-22 01:21:04,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:21:04,094 INFO L225 Difference]: With dead ends: 120 [2022-11-22 01:21:04,094 INFO L226 Difference]: Without dead ends: 111 [2022-11-22 01:21:04,095 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=136, Invalid=620, Unknown=0, NotChecked=0, Total=756 [2022-11-22 01:21:04,096 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 86 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:21:04,097 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [86 Valid, 102 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:21:04,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2022-11-22 01:21:04,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 104. [2022-11-22 01:21:04,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 78 states have (on average 1.2179487179487178) internal successors, (95), 86 states have internal predecessors, (95), 15 states have call successors, (15), 10 states have call predecessors, (15), 10 states have return successors, (11), 7 states have call predecessors, (11), 11 states have call successors, (11) [2022-11-22 01:21:04,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 121 transitions. [2022-11-22 01:21:04,138 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 121 transitions. Word has length 20 [2022-11-22 01:21:04,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:21:04,139 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 121 transitions. [2022-11-22 01:21:04,139 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 10 states have internal predecessors, (25), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-11-22 01:21:04,141 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 121 transitions. [2022-11-22 01:21:04,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-22 01:21:04,143 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:21:04,143 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:21:04,155 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-22 01:21:04,349 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-22 01:21:04,349 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:21:04,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:21:04,350 INFO L85 PathProgramCache]: Analyzing trace with hash -1825805005, now seen corresponding path program 1 times [2022-11-22 01:21:04,350 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:21:04,350 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [716407092] [2022-11-22 01:21:04,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:21:04,350 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:21:04,361 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:21:04,362 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [642801624] [2022-11-22 01:21:04,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:21:04,362 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:21:04,362 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:21:04,364 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:21:04,394 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-22 01:21:04,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:21:04,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-22 01:21:04,430 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:21:04,448 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 01:21:04,448 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 01:21:04,448 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:21:04,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [716407092] [2022-11-22 01:21:04,448 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:21:04,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [642801624] [2022-11-22 01:21:04,449 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [642801624] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:21:04,449 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 01:21:04,449 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-22 01:21:04,449 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [577160952] [2022-11-22 01:21:04,450 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:21:04,450 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-22 01:21:04,450 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:21:04,451 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-22 01:21:04,451 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-22 01:21:04,451 INFO L87 Difference]: Start difference. First operand 104 states and 121 transitions. Second operand has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-22 01:21:04,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:21:04,509 INFO L93 Difference]: Finished difference Result 141 states and 165 transitions. [2022-11-22 01:21:04,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-22 01:21:04,510 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 25 [2022-11-22 01:21:04,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:21:04,513 INFO L225 Difference]: With dead ends: 141 [2022-11-22 01:21:04,513 INFO L226 Difference]: Without dead ends: 91 [2022-11-22 01:21:04,514 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-22 01:21:04,516 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 0 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 01:21:04,517 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 35 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 01:21:04,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-11-22 01:21:04,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2022-11-22 01:21:04,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 75 states have internal predecessors, (84), 13 states have call successors, (13), 9 states have call predecessors, (13), 8 states have return successors, (9), 6 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-22 01:21:04,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 106 transitions. [2022-11-22 01:21:04,573 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 106 transitions. Word has length 25 [2022-11-22 01:21:04,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:21:04,575 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 106 transitions. [2022-11-22 01:21:04,575 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-22 01:21:04,576 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 106 transitions. [2022-11-22 01:21:04,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-22 01:21:04,577 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:21:04,577 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:21:04,590 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-22 01:21:04,783 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-22 01:21:04,784 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:21:04,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:21:04,784 INFO L85 PathProgramCache]: Analyzing trace with hash -687200305, now seen corresponding path program 1 times [2022-11-22 01:21:04,785 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:21:04,785 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1728018883] [2022-11-22 01:21:04,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:21:04,785 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:21:04,809 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:21:04,823 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [547792763] [2022-11-22 01:21:04,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:21:04,823 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:21:04,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:21:04,825 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:21:04,832 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-22 01:21:04,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:21:04,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-22 01:21:04,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:21:04,975 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-22 01:21:04,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:21:05,106 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-22 01:21:05,106 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:21:05,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1728018883] [2022-11-22 01:21:05,106 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:21:05,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [547792763] [2022-11-22 01:21:05,107 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [547792763] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:21:05,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [288597441] [2022-11-22 01:21:05,111 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-22 01:21:05,112 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:21:05,112 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:21:05,112 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:21:05,113 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:21:05,449 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 49 for LOIs [2022-11-22 01:21:05,563 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 62 for LOIs [2022-11-22 01:21:05,588 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:21:07,094 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2235#(and (<= 2 ~counter~0) (< ~counter~0 21) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:21:07,094 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:21:07,094 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 01:21:07,095 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2022-11-22 01:21:07,095 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42660899] [2022-11-22 01:21:07,095 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 01:21:07,095 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-22 01:21:07,095 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:21:07,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-22 01:21:07,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=560, Unknown=0, NotChecked=0, Total=650 [2022-11-22 01:21:07,096 INFO L87 Difference]: Start difference. First operand 91 states and 106 transitions. Second operand has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-22 01:21:07,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:21:07,253 INFO L93 Difference]: Finished difference Result 106 states and 120 transitions. [2022-11-22 01:21:07,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-22 01:21:07,255 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 26 [2022-11-22 01:21:07,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:21:07,256 INFO L225 Difference]: With dead ends: 106 [2022-11-22 01:21:07,256 INFO L226 Difference]: Without dead ends: 86 [2022-11-22 01:21:07,257 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=107, Invalid=649, Unknown=0, NotChecked=0, Total=756 [2022-11-22 01:21:07,258 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 16 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:21:07,258 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 86 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:21:07,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-11-22 01:21:07,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2022-11-22 01:21:07,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 67 states have (on average 1.164179104477612) internal successors, (78), 71 states have internal predecessors, (78), 10 states have call successors, (10), 8 states have call predecessors, (10), 8 states have return successors, (9), 6 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-22 01:21:07,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 97 transitions. [2022-11-22 01:21:07,278 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 97 transitions. Word has length 26 [2022-11-22 01:21:07,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:21:07,279 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 97 transitions. [2022-11-22 01:21:07,279 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-22 01:21:07,279 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 97 transitions. [2022-11-22 01:21:07,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-22 01:21:07,280 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:21:07,281 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:21:07,287 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-22 01:21:07,486 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:21:07,487 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:21:07,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:21:07,488 INFO L85 PathProgramCache]: Analyzing trace with hash -810539866, now seen corresponding path program 1 times [2022-11-22 01:21:07,488 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:21:07,488 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1032784316] [2022-11-22 01:21:07,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:21:07,488 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:21:07,514 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:21:07,519 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1547444894] [2022-11-22 01:21:07,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:21:07,520 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:21:07,520 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:21:07,521 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:21:07,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-22 01:21:07,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:21:07,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-22 01:21:07,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:21:08,748 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 01:21:08,748 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:21:10,704 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 01:21:10,704 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:21:10,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1032784316] [2022-11-22 01:21:10,705 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:21:10,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1547444894] [2022-11-22 01:21:10,705 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1547444894] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:21:10,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1052973521] [2022-11-22 01:21:10,707 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-22 01:21:10,707 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:21:10,708 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:21:10,708 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:21:10,708 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:21:11,969 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2022-11-22 01:21:11,999 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 62 for LOIs [2022-11-22 01:21:12,022 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:21:15,165 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2702#(and (<= 2 ~counter~0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:21:15,165 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:21:15,166 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 01:21:15,166 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 16 [2022-11-22 01:21:15,166 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1540593681] [2022-11-22 01:21:15,166 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 01:21:15,167 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-22 01:21:15,167 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:21:15,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-22 01:21:15,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=882, Unknown=0, NotChecked=0, Total=992 [2022-11-22 01:21:15,168 INFO L87 Difference]: Start difference. First operand 86 states and 97 transitions. Second operand has 16 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 13 states have internal predecessors, (35), 5 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2022-11-22 01:21:32,576 WARN L233 SmtUtils]: Spent 13.08s on a formula simplification that was a NOOP. DAG size: 47 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 01:21:35,691 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:21:37,695 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:21:39,702 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:21:42,883 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:21:50,304 WARN L233 SmtUtils]: Spent 7.05s on a formula simplification that was a NOOP. DAG size: 43 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 01:21:53,864 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:22:00,862 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 01:22:04,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:22:04,545 INFO L93 Difference]: Finished difference Result 108 states and 120 transitions. [2022-11-22 01:22:04,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-22 01:22:04,547 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 13 states have internal predecessors, (35), 5 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) Word has length 28 [2022-11-22 01:22:04,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:22:04,548 INFO L225 Difference]: With dead ends: 108 [2022-11-22 01:22:04,548 INFO L226 Difference]: Without dead ends: 106 [2022-11-22 01:22:04,549 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 358 ImplicationChecksByTransitivity, 33.2s TimeCoverageRelationStatistics Valid=199, Invalid=1522, Unknown=1, NotChecked=0, Total=1722 [2022-11-22 01:22:04,549 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 89 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 203 mSolverCounterSat, 35 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 186 SdHoareTripleChecker+Invalid, 244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 203 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 20.5s IncrementalHoareTripleChecker+Time [2022-11-22 01:22:04,550 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [90 Valid, 186 Invalid, 244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 203 Invalid, 6 Unknown, 0 Unchecked, 20.5s Time] [2022-11-22 01:22:04,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-11-22 01:22:04,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 95. [2022-11-22 01:22:04,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 74 states have (on average 1.135135135135135) internal successors, (84), 77 states have internal predecessors, (84), 11 states have call successors, (11), 9 states have call predecessors, (11), 9 states have return successors, (10), 8 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-22 01:22:04,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 105 transitions. [2022-11-22 01:22:04,584 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 105 transitions. Word has length 28 [2022-11-22 01:22:04,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:22:04,585 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 105 transitions. [2022-11-22 01:22:04,585 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 13 states have internal predecessors, (35), 5 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2022-11-22 01:22:04,585 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 105 transitions. [2022-11-22 01:22:04,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-22 01:22:04,586 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:22:04,586 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:22:04,605 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-22 01:22:04,792 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-22 01:22:04,792 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:22:04,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:22:04,793 INFO L85 PathProgramCache]: Analyzing trace with hash -1953882091, now seen corresponding path program 2 times [2022-11-22 01:22:04,793 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:22:04,793 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [665240779] [2022-11-22 01:22:04,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:22:04,793 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:22:04,811 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:22:04,811 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1640240861] [2022-11-22 01:22:04,811 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:22:04,811 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:22:04,811 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:22:04,815 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:22:04,819 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-22 01:22:04,863 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2022-11-22 01:22:04,863 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:22:04,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-22 01:22:04,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:22:04,972 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-22 01:22:04,972 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 01:22:04,973 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:22:04,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [665240779] [2022-11-22 01:22:04,973 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:22:04,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1640240861] [2022-11-22 01:22:04,973 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1640240861] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:22:04,973 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 01:22:04,974 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-22 01:22:04,974 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [8952740] [2022-11-22 01:22:04,974 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:22:04,974 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 01:22:04,975 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:22:04,975 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 01:22:04,975 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-22 01:22:04,975 INFO L87 Difference]: Start difference. First operand 95 states and 105 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, (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) [2022-11-22 01:22:05,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:22:05,255 INFO L93 Difference]: Finished difference Result 110 states and 119 transitions. [2022-11-22 01:22:05,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-22 01:22:05,255 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, (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 31 [2022-11-22 01:22:05,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:22:05,256 INFO L225 Difference]: With dead ends: 110 [2022-11-22 01:22:05,257 INFO L226 Difference]: Without dead ends: 101 [2022-11-22 01:22:05,257 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-22 01:22:05,258 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 7 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:22:05,258 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 58 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:22:05,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-11-22 01:22:05,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 88. [2022-11-22 01:22:05,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 67 states have (on average 1.1044776119402986) internal successors, (74), 70 states have internal predecessors, (74), 11 states have call successors, (11), 9 states have call predecessors, (11), 9 states have return successors, (10), 8 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-22 01:22:05,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 95 transitions. [2022-11-22 01:22:05,285 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 95 transitions. Word has length 31 [2022-11-22 01:22:05,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:22:05,286 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 95 transitions. [2022-11-22 01:22:05,286 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, (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) [2022-11-22 01:22:05,286 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 95 transitions. [2022-11-22 01:22:05,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-22 01:22:05,287 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:22:05,287 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:22:05,293 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-22 01:22:05,493 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-22 01:22:05,493 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:22:05,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:22:05,494 INFO L85 PathProgramCache]: Analyzing trace with hash 1487974853, now seen corresponding path program 2 times [2022-11-22 01:22:05,494 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:22:05,494 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1654793135] [2022-11-22 01:22:05,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:22:05,495 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:22:05,505 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:22:05,506 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [507977057] [2022-11-22 01:22:05,506 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:22:05,506 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:22:05,506 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:22:05,507 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:22:05,523 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-22 01:22:06,332 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-22 01:22:06,332 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:22:06,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-22 01:22:06,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:22:06,877 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 10 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-22 01:22:06,878 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:22:07,575 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 10 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-22 01:22:07,575 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:22:07,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1654793135] [2022-11-22 01:22:07,575 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 01:22:07,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [507977057] [2022-11-22 01:22:07,576 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [507977057] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:22:07,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [291405890] [2022-11-22 01:22:07,578 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-22 01:22:07,578 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:22:07,578 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:22:07,578 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:22:07,578 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:22:08,479 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs [2022-11-22 01:22:08,521 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 62 for LOIs [2022-11-22 01:22:08,541 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:22:09,860 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3613#(and (<= 2 ~counter~0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:22:09,860 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:22:09,860 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 01:22:09,861 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6] total 13 [2022-11-22 01:22:09,861 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1242008749] [2022-11-22 01:22:09,861 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 01:22:09,861 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-22 01:22:09,862 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:22:09,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-22 01:22:09,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=710, Unknown=0, NotChecked=0, Total=812 [2022-11-22 01:22:09,863 INFO L87 Difference]: Start difference. First operand 88 states and 95 transitions. Second operand has 13 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 11 states have internal predecessors, (37), 7 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 7 states have call predecessors, (8), 6 states have call successors, (8) [2022-11-22 01:22:10,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:22:10,754 INFO L93 Difference]: Finished difference Result 102 states and 110 transitions. [2022-11-22 01:22:10,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-22 01:22:10,755 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 11 states have internal predecessors, (37), 7 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 7 states have call predecessors, (8), 6 states have call successors, (8) Word has length 36 [2022-11-22 01:22:10,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:22:10,755 INFO L225 Difference]: With dead ends: 102 [2022-11-22 01:22:10,755 INFO L226 Difference]: Without dead ends: 65 [2022-11-22 01:22:10,756 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=102, Invalid=710, Unknown=0, NotChecked=0, Total=812 [2022-11-22 01:22:10,757 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 33 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-22 01:22:10,757 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 88 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-22 01:22:10,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-11-22 01:22:10,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2022-11-22 01:22:10,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 50 states have (on average 1.1) internal successors, (55), 52 states have internal predecessors, (55), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-22 01:22:10,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 70 transitions. [2022-11-22 01:22:10,776 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 70 transitions. Word has length 36 [2022-11-22 01:22:10,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:22:10,776 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 70 transitions. [2022-11-22 01:22:10,776 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 11 states have internal predecessors, (37), 7 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 7 states have call predecessors, (8), 6 states have call successors, (8) [2022-11-22 01:22:10,777 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 70 transitions. [2022-11-22 01:22:10,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-11-22 01:22:10,777 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:22:10,777 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:22:10,783 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-22 01:22:10,978 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:22:10,978 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:22:10,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:22:10,979 INFO L85 PathProgramCache]: Analyzing trace with hash 1031037811, now seen corresponding path program 3 times [2022-11-22 01:22:10,979 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:22:10,979 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1295600490] [2022-11-22 01:22:10,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:22:10,979 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:22:11,006 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 01:22:11,014 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [334555476] [2022-11-22 01:22:11,014 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:22:11,014 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:22:11,015 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:22:11,016 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:22:11,035 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e5d4e0a-8db2-4e12-9ba1-924553351fed/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-22 01:22:12,946 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:22:12,946 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:22:12,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-22 01:22:12,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:25:59,596 WARN L233 SmtUtils]: Spent 2.13m on a formula simplification. DAG size of input: 23298 DAG size of output: 23260 (called from [L 800] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify)