./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_unwindbound5.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_unwindbound5.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7 --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 173419c809fa8cb7fa094fdfc7b5765802a9a2fdebfe9d0a53cd745fd0c573d2 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 18:22:52,373 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 18:22:52,375 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 18:22:52,405 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 18:22:52,405 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 18:22:52,407 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 18:22:52,409 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 18:22:52,412 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 18:22:52,414 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 18:22:52,415 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 18:22:52,416 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 18:22:52,418 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 18:22:52,418 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 18:22:52,420 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 18:22:52,421 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 18:22:52,423 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 18:22:52,424 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 18:22:52,425 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 18:22:52,427 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 18:22:52,429 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 18:22:52,431 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 18:22:52,433 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 18:22:52,434 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 18:22:52,435 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 18:22:52,439 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 18:22:52,439 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 18:22:52,440 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 18:22:52,441 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 18:22:52,442 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 18:22:52,443 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 18:22:52,443 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 18:22:52,444 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 18:22:52,445 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 18:22:52,446 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 18:22:52,447 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 18:22:52,448 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 18:22:52,448 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 18:22:52,449 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 18:22:52,449 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 18:22:52,450 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 18:22:52,451 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 18:22:52,452 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 18:22:52,477 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 18:22:52,480 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 18:22:52,481 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 18:22:52,481 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 18:22:52,482 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 18:22:52,485 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 18:22:52,485 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 18:22:52,486 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 18:22:52,486 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 18:22:52,486 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 18:22:52,486 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 18:22:52,487 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 18:22:52,487 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 18:22:52,487 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 18:22:52,487 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 18:22:52,488 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 18:22:52,488 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 18:22:52,488 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 18:22:52,489 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 18:22:52,490 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 18:22:52,490 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 18:22:52,490 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 18:22:52,491 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 18:22:52,491 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 18:22:52,491 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 18:22:52,491 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 18:22:52,493 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 18:22:52,493 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 18:22:52,493 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 18:22:52,493 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 18:22:52,494 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 18:22:52,494 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 18:22:52,494 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:22:52,495 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 18:22:52,495 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 18:22:52,495 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 18:22:52,495 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 18:22:52,495 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 18:22:52,496 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 18:22:52,496 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 18:22:52,496 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 18:22:52,496 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 173419c809fa8cb7fa094fdfc7b5765802a9a2fdebfe9d0a53cd745fd0c573d2 [2021-11-25 18:22:52,820 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 18:22:52,843 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 18:22:52,845 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 18:22:52,847 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 18:22:52,847 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 18:22:52,849 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_unwindbound5.c [2021-11-25 18:22:52,933 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/data/cf434623c/f077e96d7a404a18b611946fb60b0ccb/FLAG96a1f26ba [2021-11-25 18:22:53,481 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 18:22:53,481 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_unwindbound5.c [2021-11-25 18:22:53,488 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/data/cf434623c/f077e96d7a404a18b611946fb60b0ccb/FLAG96a1f26ba [2021-11-25 18:22:53,816 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/data/cf434623c/f077e96d7a404a18b611946fb60b0ccb [2021-11-25 18:22:53,819 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 18:22:53,821 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 18:22:53,825 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 18:22:53,826 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 18:22:53,830 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 18:22:53,830 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:22:53" (1/1) ... [2021-11-25 18:22:53,833 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@13ef0804 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:22:53, skipping insertion in model container [2021-11-25 18:22:53,834 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:22:53" (1/1) ... [2021-11-25 18:22:53,841 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 18:22:53,860 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 18:22:54,066 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_unwindbound5.c[588,601] [2021-11-25 18:22:54,088 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:22:54,096 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 18:22:54,107 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_unwindbound5.c[588,601] [2021-11-25 18:22:54,119 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:22:54,132 INFO L208 MainTranslator]: Completed translation [2021-11-25 18:22:54,133 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:22:54 WrapperNode [2021-11-25 18:22:54,133 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 18:22:54,134 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 18:22:54,134 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 18:22:54,134 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 18:22:54,142 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:22:54" (1/1) ... [2021-11-25 18:22:54,149 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:22:54" (1/1) ... [2021-11-25 18:22:54,167 INFO L137 Inliner]: procedures = 14, calls = 18, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 49 [2021-11-25 18:22:54,168 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 18:22:54,169 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 18:22:54,169 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 18:22:54,169 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 18:22:54,178 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:22:54" (1/1) ... [2021-11-25 18:22:54,179 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:22:54" (1/1) ... [2021-11-25 18:22:54,181 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:22:54" (1/1) ... [2021-11-25 18:22:54,181 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:22:54" (1/1) ... [2021-11-25 18:22:54,185 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:22:54" (1/1) ... [2021-11-25 18:22:54,189 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:22:54" (1/1) ... [2021-11-25 18:22:54,190 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:22:54" (1/1) ... [2021-11-25 18:22:54,192 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 18:22:54,193 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 18:22:54,194 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 18:22:54,194 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 18:22:54,195 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:22:54" (1/1) ... [2021-11-25 18:22:54,204 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:22:54,218 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:22:54,239 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 18:22:54,242 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 18:22:54,286 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 18:22:54,286 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 18:22:54,286 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 18:22:54,286 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 18:22:54,287 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-25 18:22:54,287 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-25 18:22:54,348 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 18:22:54,350 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 18:22:54,526 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 18:22:54,556 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 18:22:54,560 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-25 18:22:54,563 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:22:54 BoogieIcfgContainer [2021-11-25 18:22:54,563 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 18:22:54,566 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 18:22:54,567 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 18:22:54,571 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 18:22:54,571 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 06:22:53" (1/3) ... [2021-11-25 18:22:54,572 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3cfd8bdc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:22:54, skipping insertion in model container [2021-11-25 18:22:54,573 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:22:54" (2/3) ... [2021-11-25 18:22:54,573 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3cfd8bdc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:22:54, skipping insertion in model container [2021-11-25 18:22:54,574 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:22:54" (3/3) ... [2021-11-25 18:22:54,575 INFO L111 eAbstractionObserver]: Analyzing ICFG cohencu-ll_unwindbound5.c [2021-11-25 18:22:54,584 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 18:22:54,585 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 18:22:54,650 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 18:22:54,661 INFO L339 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, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 18:22:54,661 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 18:22:54,694 INFO L276 IsEmpty]: Start isEmpty. Operand has 23 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 10 states have internal predecessors, (14), 11 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-25 18:22:54,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 18:22:54,699 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:22:54,699 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-25 18:22:54,700 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:22:54,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:22:54,706 INFO L85 PathProgramCache]: Analyzing trace with hash -1408153759, now seen corresponding path program 1 times [2021-11-25 18:22:54,718 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:22:54,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [441551121] [2021-11-25 18:22:54,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:22:54,721 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:22:54,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:22:54,921 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:22:54,922 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:22:54,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [441551121] [2021-11-25 18:22:54,923 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [441551121] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:22:54,923 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:22:54,924 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 18:22:54,925 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387107714] [2021-11-25 18:22:54,926 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:22:54,930 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-25 18:22:54,943 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:22:54,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-25 18:22:54,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 18:22:54,998 INFO L87 Difference]: Start difference. First operand has 23 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 10 states have internal predecessors, (14), 11 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) Second operand has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:22:55,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:22:55,072 INFO L93 Difference]: Finished difference Result 45 states and 82 transitions. [2021-11-25 18:22:55,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-25 18:22:55,075 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-25 18:22:55,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:22:55,085 INFO L225 Difference]: With dead ends: 45 [2021-11-25 18:22:55,098 INFO L226 Difference]: Without dead ends: 21 [2021-11-25 18:22:55,102 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 18:22:55,107 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 2 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:22:55,108 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 32 Invalid, 2 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:22:55,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-25 18:22:55,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-25 18:22:55,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 8 states have (on average 1.375) internal successors, (11), 9 states have internal predecessors, (11), 11 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-25 18:22:55,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 32 transitions. [2021-11-25 18:22:55,169 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 32 transitions. Word has length 6 [2021-11-25 18:22:55,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:22:55,170 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 32 transitions. [2021-11-25 18:22:55,171 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:22:55,171 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 32 transitions. [2021-11-25 18:22:55,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 18:22:55,173 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:22:55,173 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:22:55,174 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 18:22:55,175 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:22:55,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:22:55,177 INFO L85 PathProgramCache]: Analyzing trace with hash -1232571916, now seen corresponding path program 1 times [2021-11-25 18:22:55,177 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:22:55,178 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [986986749] [2021-11-25 18:22:55,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:22:55,178 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:22:55,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:22:55,284 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:22:55,284 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:22:55,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [986986749] [2021-11-25 18:22:55,286 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [986986749] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:22:55,286 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:22:55,286 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:22:55,287 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [290137870] [2021-11-25 18:22:55,287 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:22:55,288 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:22:55,289 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:22:55,291 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:22:55,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:22:55,292 INFO L87 Difference]: Start difference. First operand 21 states and 32 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:22:55,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:22:55,342 INFO L93 Difference]: Finished difference Result 35 states and 51 transitions. [2021-11-25 18:22:55,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:22:55,343 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-25 18:22:55,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:22:55,345 INFO L225 Difference]: With dead ends: 35 [2021-11-25 18:22:55,345 INFO L226 Difference]: Without dead ends: 23 [2021-11-25 18:22:55,349 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:22:55,352 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 0 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:22:55,353 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 86 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:22:55,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-25 18:22:55,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-11-25 18:22:55,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 11 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-25 18:22:55,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 34 transitions. [2021-11-25 18:22:55,379 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 34 transitions. Word has length 7 [2021-11-25 18:22:55,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:22:55,380 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 34 transitions. [2021-11-25 18:22:55,380 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:22:55,380 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 34 transitions. [2021-11-25 18:22:55,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 18:22:55,381 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:22:55,381 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:22:55,381 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 18:22:55,382 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:22:55,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:22:55,382 INFO L85 PathProgramCache]: Analyzing trace with hash -1231022784, now seen corresponding path program 1 times [2021-11-25 18:22:55,383 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:22:55,383 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1048454771] [2021-11-25 18:22:55,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:22:55,384 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:22:55,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:22:55,477 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:22:55,477 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:22:55,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1048454771] [2021-11-25 18:22:55,478 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1048454771] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:22:55,478 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:22:55,478 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:22:55,479 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [540063523] [2021-11-25 18:22:55,479 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:22:55,479 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 18:22:55,479 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:22:55,480 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 18:22:55,480 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:22:55,481 INFO L87 Difference]: Start difference. First operand 23 states and 34 transitions. Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:22:55,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:22:55,591 INFO L93 Difference]: Finished difference Result 29 states and 39 transitions. [2021-11-25 18:22:55,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 18:22:55,591 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-25 18:22:55,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:22:55,594 INFO L225 Difference]: With dead ends: 29 [2021-11-25 18:22:55,594 INFO L226 Difference]: Without dead ends: 27 [2021-11-25 18:22:55,595 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:22:55,603 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 8 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:22:55,606 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 77 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:22:55,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-25 18:22:55,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-11-25 18:22:55,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 14 states have internal predecessors, (16), 11 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-25 18:22:55,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 37 transitions. [2021-11-25 18:22:55,621 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 37 transitions. Word has length 7 [2021-11-25 18:22:55,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:22:55,621 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 37 transitions. [2021-11-25 18:22:55,621 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:22:55,622 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 37 transitions. [2021-11-25 18:22:55,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-25 18:22:55,623 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:22:55,623 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:22:55,623 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 18:22:55,624 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:22:55,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:22:55,624 INFO L85 PathProgramCache]: Analyzing trace with hash -1004679035, now seen corresponding path program 1 times [2021-11-25 18:22:55,625 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:22:55,625 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1764466341] [2021-11-25 18:22:55,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:22:55,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:22:55,640 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:22:55,641 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1462991886] [2021-11-25 18:22:55,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:22:55,642 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:22:55,642 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:22:55,644 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:22:55,663 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 18:22:55,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:22:55,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 18:22:55,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:22:55,799 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:22:55,800 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:22:55,800 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:22:55,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1764466341] [2021-11-25 18:22:55,801 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:22:55,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1462991886] [2021-11-25 18:22:55,801 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1462991886] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:22:55,801 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:22:55,801 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 18:22:55,802 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205247778] [2021-11-25 18:22:55,802 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:22:55,803 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 18:22:55,803 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:22:55,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 18:22:55,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:22:55,804 INFO L87 Difference]: Start difference. First operand 27 states and 37 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:22:55,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:22:55,859 INFO L93 Difference]: Finished difference Result 45 states and 65 transitions. [2021-11-25 18:22:55,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:22:55,859 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-11-25 18:22:55,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:22:55,861 INFO L225 Difference]: With dead ends: 45 [2021-11-25 18:22:55,861 INFO L226 Difference]: Without dead ends: 43 [2021-11-25 18:22:55,861 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:22:55,863 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 6 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:22:55,863 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 136 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:22:55,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-11-25 18:22:55,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 33. [2021-11-25 18:22:55,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 16 states have (on average 1.1875) internal successors, (19), 18 states have internal predecessors, (19), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-25 18:22:55,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 44 transitions. [2021-11-25 18:22:55,877 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 44 transitions. Word has length 12 [2021-11-25 18:22:55,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:22:55,877 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 44 transitions. [2021-11-25 18:22:55,878 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:22:55,878 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 44 transitions. [2021-11-25 18:22:55,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-25 18:22:55,879 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:22:55,879 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:22:55,916 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 18:22:56,099 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:22:56,100 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:22:56,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:22:56,101 INFO L85 PathProgramCache]: Analyzing trace with hash 752381984, now seen corresponding path program 1 times [2021-11-25 18:22:56,101 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:22:56,101 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [245116734] [2021-11-25 18:22:56,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:22:56,102 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:22:56,114 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:22:56,115 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [271020600] [2021-11-25 18:22:56,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:22:56,116 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:22:56,116 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:22:56,117 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:22:56,140 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 18:22:56,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:22:56,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 18:22:56,201 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:22:56,274 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 18:22:56,274 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:22:56,274 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:22:56,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [245116734] [2021-11-25 18:22:56,274 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:22:56,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [271020600] [2021-11-25 18:22:56,275 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [271020600] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:22:56,275 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:22:56,275 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 18:22:56,275 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [890237077] [2021-11-25 18:22:56,275 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:22:56,276 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 18:22:56,276 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:22:56,276 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 18:22:56,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:22:56,277 INFO L87 Difference]: Start difference. First operand 33 states and 44 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 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) [2021-11-25 18:22:56,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:22:56,332 INFO L93 Difference]: Finished difference Result 49 states and 68 transitions. [2021-11-25 18:22:56,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:22:56,333 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 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 17 [2021-11-25 18:22:56,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:22:56,334 INFO L225 Difference]: With dead ends: 49 [2021-11-25 18:22:56,334 INFO L226 Difference]: Without dead ends: 47 [2021-11-25 18:22:56,334 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:22:56,335 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 6 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:22:56,336 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 139 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:22:56,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-25 18:22:56,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 43. [2021-11-25 18:22:56,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 20 states have (on average 1.2) internal successors, (24), 22 states have internal predecessors, (24), 18 states have call successors, (18), 4 states have call predecessors, (18), 4 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-25 18:22:56,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 59 transitions. [2021-11-25 18:22:56,347 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 59 transitions. Word has length 17 [2021-11-25 18:22:56,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:22:56,347 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 59 transitions. [2021-11-25 18:22:56,348 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 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) [2021-11-25 18:22:56,348 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 59 transitions. [2021-11-25 18:22:56,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-25 18:22:56,348 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:22:56,349 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:22:56,385 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 18:22:56,575 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:22:56,576 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:22:56,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:22:56,577 INFO L85 PathProgramCache]: Analyzing trace with hash -2088406747, now seen corresponding path program 1 times [2021-11-25 18:22:56,577 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:22:56,577 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [151845947] [2021-11-25 18:22:56,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:22:56,577 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:22:56,590 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:22:56,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1701824499] [2021-11-25 18:22:56,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:22:56,591 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:22:56,591 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:22:56,607 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:22:56,617 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 18:22:56,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:22:56,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 18:22:56,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:22:56,793 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 18:22:56,793 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:22:56,793 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:22:56,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [151845947] [2021-11-25 18:22:56,793 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:22:56,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1701824499] [2021-11-25 18:22:56,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1701824499] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:22:56,794 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:22:56,794 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 18:22:56,794 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1517103184] [2021-11-25 18:22:56,794 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:22:56,795 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 18:22:56,795 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:22:56,795 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 18:22:56,795 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:22:56,796 INFO L87 Difference]: Start difference. First operand 43 states and 59 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 18:22:56,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:22:56,904 INFO L93 Difference]: Finished difference Result 57 states and 74 transitions. [2021-11-25 18:22:56,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:22:56,904 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 22 [2021-11-25 18:22:56,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:22:56,907 INFO L225 Difference]: With dead ends: 57 [2021-11-25 18:22:56,907 INFO L226 Difference]: Without dead ends: 45 [2021-11-25 18:22:56,907 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:22:56,909 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 6 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:22:56,911 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 128 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:22:56,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-25 18:22:56,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-11-25 18:22:56,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 24 states have internal predecessors, (26), 16 states have call successors, (16), 5 states have call predecessors, (16), 5 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-25 18:22:56,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 57 transitions. [2021-11-25 18:22:56,937 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 57 transitions. Word has length 22 [2021-11-25 18:22:56,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:22:56,938 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 57 transitions. [2021-11-25 18:22:56,938 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 18:22:56,938 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 57 transitions. [2021-11-25 18:22:56,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-25 18:22:56,940 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:22:56,941 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:22:56,963 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-25 18:22:57,141 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:22:57,141 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:22:57,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:22:57,142 INFO L85 PathProgramCache]: Analyzing trace with hash 204620983, now seen corresponding path program 1 times [2021-11-25 18:22:57,142 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:22:57,142 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1057783281] [2021-11-25 18:22:57,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:22:57,143 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:22:57,154 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:22:57,155 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1715781921] [2021-11-25 18:22:57,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:22:57,155 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:22:57,155 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:22:57,156 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:22:57,162 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 18:22:57,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:22:57,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 18:22:57,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:22:57,319 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 30 proven. 2 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-25 18:22:57,319 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:22:57,418 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-25 18:22:57,418 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:22:57,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1057783281] [2021-11-25 18:22:57,419 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:22:57,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1715781921] [2021-11-25 18:22:57,419 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1715781921] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:22:57,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1456082300] [2021-11-25 18:22:57,436 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-25 18:22:57,436 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:22:57,440 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:22:57,445 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:22:57,446 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:23:04,261 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-25 18:23:04,272 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:23:05,196 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1154#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 18:23:05,196 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:23:05,197 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:23:05,197 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2021-11-25 18:23:05,197 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933364344] [2021-11-25 18:23:05,197 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 18:23:05,198 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 18:23:05,198 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:23:05,199 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 18:23:05,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=374, Unknown=0, NotChecked=0, Total=462 [2021-11-25 18:23:05,199 INFO L87 Difference]: Start difference. First operand 45 states and 57 transitions. Second operand has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 3 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-25 18:23:05,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:23:05,406 INFO L93 Difference]: Finished difference Result 115 states and 150 transitions. [2021-11-25 18:23:05,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 18:23:05,408 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 3 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 40 [2021-11-25 18:23:05,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:23:05,415 INFO L225 Difference]: With dead ends: 115 [2021-11-25 18:23:05,415 INFO L226 Difference]: Without dead ends: 99 [2021-11-25 18:23:05,420 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=108, Invalid=492, Unknown=0, NotChecked=0, Total=600 [2021-11-25 18:23:05,421 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 63 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:23:05,421 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 168 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:23:05,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-11-25 18:23:05,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 95. [2021-11-25 18:23:05,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 46 states have (on average 1.1521739130434783) internal successors, (53), 49 states have internal predecessors, (53), 38 states have call successors, (38), 10 states have call predecessors, (38), 10 states have return successors, (35), 35 states have call predecessors, (35), 35 states have call successors, (35) [2021-11-25 18:23:05,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 126 transitions. [2021-11-25 18:23:05,441 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 126 transitions. Word has length 40 [2021-11-25 18:23:05,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:23:05,442 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 126 transitions. [2021-11-25 18:23:05,442 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 3 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-25 18:23:05,442 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 126 transitions. [2021-11-25 18:23:05,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-25 18:23:05,444 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:23:05,444 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:23:05,464 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-11-25 18:23:05,664 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:23:05,665 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:23:05,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:23:05,665 INFO L85 PathProgramCache]: Analyzing trace with hash 696736299, now seen corresponding path program 1 times [2021-11-25 18:23:05,665 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:23:05,666 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [796756236] [2021-11-25 18:23:05,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:23:05,666 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:23:05,680 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:23:05,680 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1862855812] [2021-11-25 18:23:05,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:23:05,681 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:23:05,681 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:23:05,682 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:23:05,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 18:23:05,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:23:05,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 18:23:05,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:23:05,977 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 12 proven. 4 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-25 18:23:05,977 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:23:06,121 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 12 proven. 4 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-25 18:23:06,121 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:23:06,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [796756236] [2021-11-25 18:23:06,121 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:23:06,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1862855812] [2021-11-25 18:23:06,122 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1862855812] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:23:06,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [409448466] [2021-11-25 18:23:06,124 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 18:23:06,124 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:23:06,125 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:23:06,125 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:23:06,125 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:23:09,563 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-25 18:23:09,573 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:23:11,688 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1740#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 18:23:11,688 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:23:11,688 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:23:11,688 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2021-11-25 18:23:11,688 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1318440480] [2021-11-25 18:23:11,688 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 18:23:11,689 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 18:23:11,689 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:23:11,689 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 18:23:11,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2021-11-25 18:23:11,690 INFO L87 Difference]: Start difference. First operand 95 states and 126 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-25 18:23:12,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:23:12,275 INFO L93 Difference]: Finished difference Result 113 states and 142 transitions. [2021-11-25 18:23:12,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 18:23:12,275 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 40 [2021-11-25 18:23:12,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:23:12,277 INFO L225 Difference]: With dead ends: 113 [2021-11-25 18:23:12,277 INFO L226 Difference]: Without dead ends: 111 [2021-11-25 18:23:12,277 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 99 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=94, Invalid=412, Unknown=0, NotChecked=0, Total=506 [2021-11-25 18:23:12,278 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 12 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:23:12,278 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 136 Invalid, 165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:23:12,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-11-25 18:23:12,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2021-11-25 18:23:12,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 58 states have (on average 1.1206896551724137) internal successors, (65), 61 states have internal predecessors, (65), 38 states have call successors, (38), 14 states have call predecessors, (38), 14 states have return successors, (35), 35 states have call predecessors, (35), 35 states have call successors, (35) [2021-11-25 18:23:12,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 138 transitions. [2021-11-25 18:23:12,310 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 138 transitions. Word has length 40 [2021-11-25 18:23:12,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:23:12,310 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 138 transitions. [2021-11-25 18:23:12,311 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-25 18:23:12,311 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 138 transitions. [2021-11-25 18:23:12,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 18:23:12,312 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:23:12,312 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:23:12,349 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 18:23:12,535 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:23:12,536 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:23:12,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:23:12,537 INFO L85 PathProgramCache]: Analyzing trace with hash -1539244486, now seen corresponding path program 2 times [2021-11-25 18:23:12,537 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:23:12,537 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [959817552] [2021-11-25 18:23:12,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:23:12,537 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:23:12,552 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:23:12,553 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [401191823] [2021-11-25 18:23:12,553 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:23:12,553 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:23:12,553 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:23:12,554 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:23:12,565 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 18:23:12,620 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 18:23:12,620 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:23:12,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 18:23:12,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:23:12,767 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 14 proven. 5 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-25 18:23:12,768 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:23:12,878 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 14 proven. 5 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-25 18:23:12,878 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:23:12,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [959817552] [2021-11-25 18:23:12,879 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:23:12,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [401191823] [2021-11-25 18:23:12,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [401191823] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:23:12,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1315616185] [2021-11-25 18:23:12,882 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 18:23:12,882 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:23:12,882 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:23:12,882 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:23:12,883 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:23:16,335 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-25 18:23:16,344 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:23:20,088 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2368#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 18:23:20,088 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:23:20,089 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:23:20,089 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2021-11-25 18:23:20,089 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1307199471] [2021-11-25 18:23:20,089 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 18:23:20,089 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 18:23:20,090 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:23:20,090 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 18:23:20,092 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=303, Unknown=0, NotChecked=0, Total=380 [2021-11-25 18:23:20,098 INFO L87 Difference]: Start difference. First operand 111 states and 138 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) [2021-11-25 18:23:20,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:23:20,234 INFO L93 Difference]: Finished difference Result 117 states and 143 transitions. [2021-11-25 18:23:20,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 18:23:20,236 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) Word has length 45 [2021-11-25 18:23:20,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:23:20,238 INFO L225 Difference]: With dead ends: 117 [2021-11-25 18:23:20,240 INFO L226 Difference]: Without dead ends: 115 [2021-11-25 18:23:20,241 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 114 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=81, Invalid=339, Unknown=0, NotChecked=0, Total=420 [2021-11-25 18:23:20,242 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 7 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:23:20,243 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 199 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:23:20,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-11-25 18:23:20,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2021-11-25 18:23:20,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 61 states have (on average 1.1147540983606556) internal successors, (68), 64 states have internal predecessors, (68), 38 states have call successors, (38), 15 states have call predecessors, (38), 15 states have return successors, (35), 35 states have call predecessors, (35), 35 states have call successors, (35) [2021-11-25 18:23:20,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 141 transitions. [2021-11-25 18:23:20,311 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 141 transitions. Word has length 45 [2021-11-25 18:23:20,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:23:20,312 INFO L470 AbstractCegarLoop]: Abstraction has 115 states and 141 transitions. [2021-11-25 18:23:20,312 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) [2021-11-25 18:23:20,312 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 141 transitions. [2021-11-25 18:23:20,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-25 18:23:20,314 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:23:20,314 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:23:20,362 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 18:23:20,515 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-25 18:23:20,515 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:23:20,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:23:20,516 INFO L85 PathProgramCache]: Analyzing trace with hash -375151797, now seen corresponding path program 3 times [2021-11-25 18:23:20,516 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:23:20,516 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [573248056] [2021-11-25 18:23:20,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:23:20,516 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:23:20,528 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:23:20,528 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [741047374] [2021-11-25 18:23:20,528 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:23:20,529 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:23:20,529 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:23:20,539 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:23:20,555 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 18:23:20,676 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:23:20,676 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:23:20,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-25 18:23:20,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:23:21,153 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 42 proven. 16 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2021-11-25 18:23:21,154 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:23:21,701 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 61 proven. 3 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-25 18:23:21,701 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:23:21,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [573248056] [2021-11-25 18:23:21,702 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:23:21,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [741047374] [2021-11-25 18:23:21,702 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [741047374] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:23:21,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [393010936] [2021-11-25 18:23:21,708 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 18:23:21,708 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:23:21,708 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:23:21,709 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:23:21,709 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:23:26,634 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-25 18:23:26,643 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:23:27,508 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3038#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 18:23:27,508 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:23:27,508 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:23:27,508 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 14 [2021-11-25 18:23:27,509 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725424239] [2021-11-25 18:23:27,509 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 18:23:27,509 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 18:23:27,510 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:23:27,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 18:23:27,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=540, Unknown=0, NotChecked=0, Total=650 [2021-11-25 18:23:27,511 INFO L87 Difference]: Start difference. First operand 115 states and 141 transitions. Second operand has 14 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 8 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (15), 8 states have call predecessors, (15), 6 states have call successors, (15) [2021-11-25 18:23:29,872 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:23:31,970 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:23:33,978 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:23:34,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:23:34,047 INFO L93 Difference]: Finished difference Result 129 states and 154 transitions. [2021-11-25 18:23:34,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 18:23:34,048 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 8 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (15), 8 states have call predecessors, (15), 6 states have call successors, (15) Word has length 50 [2021-11-25 18:23:34,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:23:34,050 INFO L225 Difference]: With dead ends: 129 [2021-11-25 18:23:34,050 INFO L226 Difference]: Without dead ends: 121 [2021-11-25 18:23:34,051 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 121 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 198 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=124, Invalid=632, Unknown=0, NotChecked=0, Total=756 [2021-11-25 18:23:34,052 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 21 mSDsluCounter, 119 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 19 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 8 IncrementalHoareTripleChecker+Unchecked, 6.5s IncrementalHoareTripleChecker+Time [2021-11-25 18:23:34,052 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 132 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 93 Invalid, 3 Unknown, 8 Unchecked, 6.5s Time] [2021-11-25 18:23:34,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-11-25 18:23:34,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 107. [2021-11-25 18:23:34,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 64 states have (on average 1.078125) internal successors, (69), 67 states have internal predecessors, (69), 26 states have call successors, (26), 16 states have call predecessors, (26), 16 states have return successors, (25), 23 states have call predecessors, (25), 25 states have call successors, (25) [2021-11-25 18:23:34,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 120 transitions. [2021-11-25 18:23:34,073 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 120 transitions. Word has length 50 [2021-11-25 18:23:34,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:23:34,073 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 120 transitions. [2021-11-25 18:23:34,074 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 8 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (15), 8 states have call predecessors, (15), 6 states have call successors, (15) [2021-11-25 18:23:34,074 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 120 transitions. [2021-11-25 18:23:34,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-25 18:23:34,076 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:23:34,076 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:23:34,092 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 18:23:34,295 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 18:23:34,295 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:23:34,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:23:34,296 INFO L85 PathProgramCache]: Analyzing trace with hash 780075682, now seen corresponding path program 1 times [2021-11-25 18:23:34,296 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:23:34,296 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [318272400] [2021-11-25 18:23:34,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:23:34,296 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:23:34,308 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:23:34,308 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [984705449] [2021-11-25 18:23:34,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:23:34,309 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:23:34,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:23:34,310 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:23:34,317 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 18:23:34,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:23:34,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-25 18:23:34,377 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:23:34,722 INFO L134 CoverageAnalysis]: Checked inductivity of 250 backedges. 22 proven. 8 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-11-25 18:23:34,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:23:34,987 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:23:34,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [318272400] [2021-11-25 18:23:34,988 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:23:34,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [984705449] [2021-11-25 18:23:34,988 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [984705449] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:23:34,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [653779147] [2021-11-25 18:23:34,992 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-25 18:23:34,992 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:23:34,993 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:23:34,993 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:23:34,993 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:23:38,650 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-25 18:23:38,659 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:23:40,979 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3720#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 18:23:40,980 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:23:40,980 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:23:40,980 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-11-25 18:23:40,980 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1127938197] [2021-11-25 18:23:40,980 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-25 18:23:40,981 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 18:23:40,981 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:23:40,982 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 18:23:40,982 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=416, Unknown=0, NotChecked=0, Total=506 [2021-11-25 18:23:40,982 INFO L87 Difference]: Start difference. First operand 107 states and 120 transitions. Second operand has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 18:23:41,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:23:41,135 INFO L93 Difference]: Finished difference Result 116 states and 130 transitions. [2021-11-25 18:23:41,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 18:23:41,138 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 66 [2021-11-25 18:23:41,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:23:41,140 INFO L225 Difference]: With dead ends: 116 [2021-11-25 18:23:41,140 INFO L226 Difference]: Without dead ends: 114 [2021-11-25 18:23:41,141 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 147 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=100, Invalid=500, Unknown=0, NotChecked=0, Total=600 [2021-11-25 18:23:41,141 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 6 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:23:41,141 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 180 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:23:41,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-11-25 18:23:41,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 112. [2021-11-25 18:23:41,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 67 states have (on average 1.0746268656716418) internal successors, (72), 70 states have internal predecessors, (72), 27 states have call successors, (27), 17 states have call predecessors, (27), 17 states have return successors, (26), 24 states have call predecessors, (26), 26 states have call successors, (26) [2021-11-25 18:23:41,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 125 transitions. [2021-11-25 18:23:41,157 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 125 transitions. Word has length 66 [2021-11-25 18:23:41,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:23:41,157 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 125 transitions. [2021-11-25 18:23:41,158 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 18:23:41,158 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 125 transitions. [2021-11-25 18:23:41,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-25 18:23:41,159 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:23:41,160 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:23:41,193 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-11-25 18:23:41,379 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-25 18:23:41,380 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:23:41,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:23:41,380 INFO L85 PathProgramCache]: Analyzing trace with hash -1686864157, now seen corresponding path program 1 times [2021-11-25 18:23:41,380 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:23:41,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1511482159] [2021-11-25 18:23:41,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:23:41,381 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:23:41,396 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:23:41,402 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2100226218] [2021-11-25 18:23:41,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:23:41,403 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:23:41,403 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:23:41,420 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:23:41,447 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 18:23:41,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:23:41,502 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 43 conjunts are in the unsatisfiable core [2021-11-25 18:23:41,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:23:42,562 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 86 proven. 42 refuted. 0 times theorem prover too weak. 168 trivial. 0 not checked. [2021-11-25 18:23:42,562 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:23:43,541 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 98 proven. 9 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2021-11-25 18:23:43,542 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:23:43,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1511482159] [2021-11-25 18:23:43,542 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:23:43,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2100226218] [2021-11-25 18:23:43,542 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2100226218] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:23:43,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1635105878] [2021-11-25 18:23:43,545 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-25 18:23:43,545 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:23:43,546 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:23:43,546 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:23:43,546 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:23:47,367 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2021-11-25 18:23:47,370 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:23:50,001 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4500#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0))' at error location [2021-11-25 18:23:50,001 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:23:50,001 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:23:50,002 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 15 [2021-11-25 18:23:50,002 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1211053820] [2021-11-25 18:23:50,002 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 18:23:50,003 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-25 18:23:50,003 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:23:50,003 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-25 18:23:50,004 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=576, Unknown=0, NotChecked=0, Total=702 [2021-11-25 18:23:50,004 INFO L87 Difference]: Start difference. First operand 112 states and 125 transitions. Second operand has 15 states, 10 states have (on average 2.3) internal successors, (23), 10 states have internal predecessors, (23), 8 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 9 states have call predecessors, (21), 6 states have call successors, (21) [2021-11-25 18:23:51,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:23:51,151 INFO L93 Difference]: Finished difference Result 123 states and 139 transitions. [2021-11-25 18:23:51,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 18:23:51,151 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 10 states have (on average 2.3) internal successors, (23), 10 states have internal predecessors, (23), 8 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 9 states have call predecessors, (21), 6 states have call successors, (21) Word has length 71 [2021-11-25 18:23:51,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:23:51,153 INFO L225 Difference]: With dead ends: 123 [2021-11-25 18:23:51,153 INFO L226 Difference]: Without dead ends: 113 [2021-11-25 18:23:51,154 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 183 SyntacticMatches, 4 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 199 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=143, Invalid=669, Unknown=0, NotChecked=0, Total=812 [2021-11-25 18:23:51,154 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 28 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 276 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 327 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 276 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:23:51,155 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 135 Invalid, 327 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 276 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 18:23:51,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-25 18:23:51,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2021-11-25 18:23:51,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 67 states have (on average 1.0597014925373134) internal successors, (71), 70 states have internal predecessors, (71), 28 states have call successors, (28), 17 states have call predecessors, (28), 17 states have return successors, (27), 25 states have call predecessors, (27), 27 states have call successors, (27) [2021-11-25 18:23:51,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 126 transitions. [2021-11-25 18:23:51,172 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 126 transitions. Word has length 71 [2021-11-25 18:23:51,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:23:51,172 INFO L470 AbstractCegarLoop]: Abstraction has 113 states and 126 transitions. [2021-11-25 18:23:51,173 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 10 states have (on average 2.3) internal successors, (23), 10 states have internal predecessors, (23), 8 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 9 states have call predecessors, (21), 6 states have call successors, (21) [2021-11-25 18:23:51,173 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 126 transitions. [2021-11-25 18:23:51,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-25 18:23:51,175 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:23:51,175 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:23:51,213 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 18:23:51,391 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-25 18:23:51,392 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:23:51,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:23:51,393 INFO L85 PathProgramCache]: Analyzing trace with hash -1183378488, now seen corresponding path program 2 times [2021-11-25 18:23:51,393 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:23:51,393 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1055696909] [2021-11-25 18:23:51,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:23:51,393 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:23:51,405 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:23:51,406 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1944005602] [2021-11-25 18:23:51,406 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:23:51,406 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:23:51,406 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:23:51,407 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:23:51,429 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 18:23:51,568 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 18:23:51,568 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:23:51,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-25 18:23:51,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:23:52,074 INFO L134 CoverageAnalysis]: Checked inductivity of 536 backedges. 32 proven. 24 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2021-11-25 18:23:52,074 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:23:52,358 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:23:52,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1055696909] [2021-11-25 18:23:52,358 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:23:52,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1944005602] [2021-11-25 18:23:52,359 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1944005602] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:23:52,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [272985557] [2021-11-25 18:23:52,361 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-25 18:23:52,361 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:23:52,362 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:23:52,362 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:23:52,362 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:23:55,819 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-25 18:23:55,828 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:23:58,186 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5265#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 18:23:58,187 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:23:58,187 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:23:58,187 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-11-25 18:23:58,187 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1873274307] [2021-11-25 18:23:58,187 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-25 18:23:58,187 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 18:23:58,188 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:23:58,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 18:23:58,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=458, Unknown=0, NotChecked=0, Total=552 [2021-11-25 18:23:58,188 INFO L87 Difference]: Start difference. First operand 113 states and 126 transitions. Second operand has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 4 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-25 18:23:58,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:23:58,360 INFO L93 Difference]: Finished difference Result 126 states and 139 transitions. [2021-11-25 18:23:58,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 18:23:58,360 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 4 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) Word has length 94 [2021-11-25 18:23:58,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:23:58,362 INFO L225 Difference]: With dead ends: 126 [2021-11-25 18:23:58,362 INFO L226 Difference]: Without dead ends: 124 [2021-11-25 18:23:58,363 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 202 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=105, Invalid=545, Unknown=0, NotChecked=0, Total=650 [2021-11-25 18:23:58,364 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 6 mSDsluCounter, 207 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 246 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:23:58,364 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 246 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:23:58,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-25 18:23:58,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 122. [2021-11-25 18:23:58,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 73 states have (on average 1.0547945205479452) internal successors, (77), 76 states have internal predecessors, (77), 29 states have call successors, (29), 19 states have call predecessors, (29), 19 states have return successors, (28), 26 states have call predecessors, (28), 28 states have call successors, (28) [2021-11-25 18:23:58,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 134 transitions. [2021-11-25 18:23:58,386 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 134 transitions. Word has length 94 [2021-11-25 18:23:58,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:23:58,386 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 134 transitions. [2021-11-25 18:23:58,387 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 4 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-25 18:23:58,387 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 134 transitions. [2021-11-25 18:23:58,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-25 18:23:58,389 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:23:58,389 INFO L514 BasicCegarLoop]: trace histogram [19, 18, 18, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:23:58,424 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 18:23:58,603 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-25 18:23:58,603 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:23:58,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:23:58,604 INFO L85 PathProgramCache]: Analyzing trace with hash -2040662872, now seen corresponding path program 1 times [2021-11-25 18:23:58,604 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:23:58,604 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [333904834] [2021-11-25 18:23:58,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:23:58,605 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:23:58,618 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:23:58,619 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [300917950] [2021-11-25 18:23:58,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:23:58,619 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:23:58,625 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:23:58,631 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:23:58,632 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 18:23:58,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:23:58,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-25 18:23:58,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:23:59,249 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 83 proven. 28 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2021-11-25 18:23:59,249 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:24:03,170 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:24:03,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [333904834] [2021-11-25 18:24:03,170 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:24:03,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [300917950] [2021-11-25 18:24:03,171 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [300917950] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:24:03,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [518567104] [2021-11-25 18:24:03,173 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-25 18:24:03,173 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:24:03,174 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:24:03,174 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:24:03,174 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:24:09,495 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-25 18:24:09,503 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:24:12,821 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6110#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 18:24:12,821 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:24:12,821 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:24:12,821 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-11-25 18:24:12,821 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678435666] [2021-11-25 18:24:12,822 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-25 18:24:12,822 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 18:24:12,822 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:24:12,823 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 18:24:12,823 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=725, Unknown=1, NotChecked=0, Total=870 [2021-11-25 18:24:12,824 INFO L87 Difference]: Start difference. First operand 122 states and 134 transitions. Second operand has 11 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 5 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (18), 5 states have call predecessors, (18), 5 states have call successors, (18) [2021-11-25 18:24:13,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:24:13,253 INFO L93 Difference]: Finished difference Result 138 states and 148 transitions. [2021-11-25 18:24:13,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 18:24:13,253 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 5 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (18), 5 states have call predecessors, (18), 5 states have call successors, (18) Word has length 104 [2021-11-25 18:24:13,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:24:13,255 INFO L225 Difference]: With dead ends: 138 [2021-11-25 18:24:13,255 INFO L226 Difference]: Without dead ends: 120 [2021-11-25 18:24:13,256 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 225 SyntacticMatches, 3 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 246 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=167, Invalid=888, Unknown=1, NotChecked=0, Total=1056 [2021-11-25 18:24:13,256 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 15 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 297 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 205 SdHoareTripleChecker+Invalid, 337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 297 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:24:13,257 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 205 Invalid, 337 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 297 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:24:13,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-11-25 18:24:13,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2021-11-25 18:24:13,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 73 states have (on average 1.0410958904109588) internal successors, (76), 75 states have internal predecessors, (76), 27 states have call successors, (27), 19 states have call predecessors, (27), 19 states have return successors, (26), 25 states have call predecessors, (26), 26 states have call successors, (26) [2021-11-25 18:24:13,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 129 transitions. [2021-11-25 18:24:13,273 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 129 transitions. Word has length 104 [2021-11-25 18:24:13,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:24:13,274 INFO L470 AbstractCegarLoop]: Abstraction has 120 states and 129 transitions. [2021-11-25 18:24:13,274 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 5 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (18), 5 states have call predecessors, (18), 5 states have call successors, (18) [2021-11-25 18:24:13,275 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 129 transitions. [2021-11-25 18:24:13,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-11-25 18:24:13,276 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:24:13,277 INFO L514 BasicCegarLoop]: trace histogram [22, 21, 21, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:24:13,302 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 18:24:13,491 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 18:24:13,492 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:24:13,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:24:13,492 INFO L85 PathProgramCache]: Analyzing trace with hash 276271086, now seen corresponding path program 3 times [2021-11-25 18:24:13,492 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:24:13,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1360270477] [2021-11-25 18:24:13,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:24:13,493 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:24:13,505 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:24:13,505 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [728736586] [2021-11-25 18:24:13,505 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:24:13,505 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:24:13,506 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:24:13,512 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:24:13,543 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 18:24:13,683 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:24:13,684 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:24:13,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-25 18:24:13,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:24:14,192 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 42 proven. 48 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2021-11-25 18:24:14,192 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:24:14,469 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:24:14,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1360270477] [2021-11-25 18:24:14,470 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:24:14,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [728736586] [2021-11-25 18:24:14,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [728736586] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:24:14,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1834262919] [2021-11-25 18:24:14,472 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-25 18:24:14,472 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:24:14,472 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:24:14,472 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:24:14,472 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:24:17,381 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-25 18:24:17,390 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:24:19,404 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6989#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 18:24:19,404 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:24:19,404 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:24:19,409 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-11-25 18:24:19,409 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130301977] [2021-11-25 18:24:19,409 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-25 18:24:19,410 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 18:24:19,410 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:24:19,410 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 18:24:19,411 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=504, Unknown=0, NotChecked=0, Total=600 [2021-11-25 18:24:19,411 INFO L87 Difference]: Start difference. First operand 120 states and 129 transitions. Second operand has 9 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 5 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (21), 5 states have call predecessors, (21), 5 states have call successors, (21) [2021-11-25 18:24:19,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:24:19,630 INFO L93 Difference]: Finished difference Result 136 states and 153 transitions. [2021-11-25 18:24:19,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 18:24:19,630 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 5 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (21), 5 states have call predecessors, (21), 5 states have call successors, (21) Word has length 122 [2021-11-25 18:24:19,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:24:19,631 INFO L225 Difference]: With dead ends: 136 [2021-11-25 18:24:19,631 INFO L226 Difference]: Without dead ends: 134 [2021-11-25 18:24:19,632 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 257 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=106, Invalid=596, Unknown=0, NotChecked=0, Total=702 [2021-11-25 18:24:19,633 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 6 mSDsluCounter, 292 mSDsCounter, 0 mSdLazyCounter, 206 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 341 SdHoareTripleChecker+Invalid, 226 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:24:19,633 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 341 Invalid, 226 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 206 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:24:19,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-11-25 18:24:19,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 132. [2021-11-25 18:24:19,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 77 states have (on average 1.051948051948052) internal successors, (81), 80 states have internal predecessors, (81), 34 states have call successors, (34), 20 states have call predecessors, (34), 20 states have return successors, (33), 31 states have call predecessors, (33), 33 states have call successors, (33) [2021-11-25 18:24:19,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 148 transitions. [2021-11-25 18:24:19,649 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 148 transitions. Word has length 122 [2021-11-25 18:24:19,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:24:19,650 INFO L470 AbstractCegarLoop]: Abstraction has 132 states and 148 transitions. [2021-11-25 18:24:19,650 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 5 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (21), 5 states have call predecessors, (21), 5 states have call successors, (21) [2021-11-25 18:24:19,650 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 148 transitions. [2021-11-25 18:24:19,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-25 18:24:19,652 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:24:19,652 INFO L514 BasicCegarLoop]: trace histogram [22, 21, 21, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:24:19,658 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-25 18:24:19,852 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-25 18:24:19,853 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:24:19,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:24:19,853 INFO L85 PathProgramCache]: Analyzing trace with hash 2067588009, now seen corresponding path program 2 times [2021-11-25 18:24:19,853 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:24:19,854 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1379263830] [2021-11-25 18:24:19,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:24:19,854 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:24:19,865 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:24:19,865 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [457633154] [2021-11-25 18:24:19,865 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:24:19,865 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:24:19,866 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:24:19,866 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:24:19,870 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 18:24:20,014 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-25 18:24:20,014 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:24:20,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 18:24:20,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:24:20,246 INFO L134 CoverageAnalysis]: Checked inductivity of 938 backedges. 120 proven. 656 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2021-11-25 18:24:20,246 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:24:20,468 INFO L134 CoverageAnalysis]: Checked inductivity of 938 backedges. 42 proven. 56 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2021-11-25 18:24:20,468 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:24:20,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1379263830] [2021-11-25 18:24:20,468 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:24:20,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [457633154] [2021-11-25 18:24:20,469 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [457633154] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:24:20,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1548500118] [2021-11-25 18:24:20,471 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-25 18:24:20,471 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:24:20,471 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:24:20,471 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:24:20,471 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:24:23,352 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-25 18:24:23,362 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:24:27,345 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8140#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 18:24:27,346 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:24:27,346 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:24:27,346 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 8 [2021-11-25 18:24:27,346 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715058055] [2021-11-25 18:24:27,346 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 18:24:27,347 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 18:24:27,347 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:24:27,348 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 18:24:27,348 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462 [2021-11-25 18:24:27,348 INFO L87 Difference]: Start difference. First operand 132 states and 148 transitions. Second operand has 8 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 5 states have call successors, (43), 6 states have call predecessors, (43), 6 states have return successors, (42), 5 states have call predecessors, (42), 5 states have call successors, (42) [2021-11-25 18:24:27,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:24:27,525 INFO L93 Difference]: Finished difference Result 172 states and 186 transitions. [2021-11-25 18:24:27,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 18:24:27,532 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 5 states have call successors, (43), 6 states have call predecessors, (43), 6 states have return successors, (42), 5 states have call predecessors, (42), 5 states have call successors, (42) Word has length 124 [2021-11-25 18:24:27,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:24:27,533 INFO L225 Difference]: With dead ends: 172 [2021-11-25 18:24:27,534 INFO L226 Difference]: Without dead ends: 156 [2021-11-25 18:24:27,534 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 374 GetRequests, 349 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=119, Invalid=531, Unknown=0, NotChecked=0, Total=650 [2021-11-25 18:24:27,535 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 10 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:24:27,535 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 151 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:24:27,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-11-25 18:24:27,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 154. [2021-11-25 18:24:27,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 93 states have (on average 1.043010752688172) internal successors, (97), 95 states have internal predecessors, (97), 36 states have call successors, (36), 25 states have call predecessors, (36), 24 states have return successors, (34), 33 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-25 18:24:27,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 167 transitions. [2021-11-25 18:24:27,564 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 167 transitions. Word has length 124 [2021-11-25 18:24:27,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:24:27,565 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 167 transitions. [2021-11-25 18:24:27,565 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 5 states have call successors, (43), 6 states have call predecessors, (43), 6 states have return successors, (42), 5 states have call predecessors, (42), 5 states have call successors, (42) [2021-11-25 18:24:27,565 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 167 transitions. [2021-11-25 18:24:27,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-25 18:24:27,567 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:24:27,567 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:24:27,592 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 18:24:27,771 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:24:27,772 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:24:27,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:24:27,772 INFO L85 PathProgramCache]: Analyzing trace with hash -35260082, now seen corresponding path program 2 times [2021-11-25 18:24:27,772 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:24:27,773 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [265373265] [2021-11-25 18:24:27,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:24:27,773 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:24:27,785 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:24:27,785 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1703404384] [2021-11-25 18:24:27,785 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:24:27,785 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:24:27,786 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:24:27,792 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:24:27,793 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 18:24:27,871 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 18:24:27,871 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:24:27,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-25 18:24:27,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:24:28,332 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 84 proven. 76 refuted. 0 times theorem prover too weak. 946 trivial. 0 not checked. [2021-11-25 18:24:28,333 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:24:33,192 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 84 proven. 76 refuted. 0 times theorem prover too weak. 946 trivial. 0 not checked. [2021-11-25 18:24:33,193 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:24:33,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [265373265] [2021-11-25 18:24:33,193 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:24:33,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1703404384] [2021-11-25 18:24:33,193 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1703404384] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:24:33,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1587389652] [2021-11-25 18:24:33,195 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-25 18:24:33,195 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:24:33,195 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:24:33,196 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:24:33,196 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:24:36,447 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2021-11-25 18:24:36,450 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:24:47,240 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9430#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0))' at error location [2021-11-25 18:24:47,240 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:24:47,240 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 18:24:47,240 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 16 [2021-11-25 18:24:47,240 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729609657] [2021-11-25 18:24:47,240 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 18:24:47,241 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-25 18:24:47,241 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:24:47,242 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-25 18:24:47,242 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=617, Unknown=1, NotChecked=0, Total=756 [2021-11-25 18:24:47,242 INFO L87 Difference]: Start difference. First operand 154 states and 167 transitions. Second operand has 16 states, 16 states have (on average 2.3125) internal successors, (37), 14 states have internal predecessors, (37), 9 states have call successors, (48), 2 states have call predecessors, (48), 2 states have return successors, (46), 9 states have call predecessors, (46), 9 states have call successors, (46) [2021-11-25 18:24:58,399 WARN L227 SmtUtils]: Spent 5.69s on a formula simplification. DAG size of input: 74 DAG size of output: 44 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 18:25:00,534 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:25:02,880 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.30s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:25:05,379 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.44s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:25:07,380 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:25:10,953 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:25:13,891 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.66s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:25:15,911 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:25:17,331 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.42s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 18:25:17,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:25:17,764 INFO L93 Difference]: Finished difference Result 185 states and 196 transitions. [2021-11-25 18:25:17,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 18:25:17,764 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.3125) internal successors, (37), 14 states have internal predecessors, (37), 9 states have call successors, (48), 2 states have call predecessors, (48), 2 states have return successors, (46), 9 states have call predecessors, (46), 9 states have call successors, (46) Word has length 132 [2021-11-25 18:25:17,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:25:17,766 INFO L225 Difference]: With dead ends: 185 [2021-11-25 18:25:17,766 INFO L226 Difference]: Without dead ends: 158 [2021-11-25 18:25:17,767 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 364 SyntacticMatches, 5 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 23.7s TimeCoverageRelationStatistics Valid=179, Invalid=748, Unknown=3, NotChecked=0, Total=930 [2021-11-25 18:25:17,767 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 28 mSDsluCounter, 275 mSDsCounter, 0 mSdLazyCounter, 434 mSolverCounterSat, 73 mSolverCounterUnsat, 7 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 514 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 434 IncrementalHoareTripleChecker+Invalid, 7 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:25:17,768 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 309 Invalid, 514 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 434 Invalid, 7 Unknown, 0 Unchecked, 19.3s Time] [2021-11-25 18:25:17,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2021-11-25 18:25:17,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 158. [2021-11-25 18:25:17,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 97 states have (on average 1.0309278350515463) internal successors, (100), 100 states have internal predecessors, (100), 34 states have call successors, (34), 26 states have call predecessors, (34), 26 states have return successors, (32), 31 states have call predecessors, (32), 32 states have call successors, (32) [2021-11-25 18:25:17,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 166 transitions. [2021-11-25 18:25:17,789 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 166 transitions. Word has length 132 [2021-11-25 18:25:17,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:25:17,789 INFO L470 AbstractCegarLoop]: Abstraction has 158 states and 166 transitions. [2021-11-25 18:25:17,790 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.3125) internal successors, (37), 14 states have internal predecessors, (37), 9 states have call successors, (48), 2 states have call predecessors, (48), 2 states have return successors, (46), 9 states have call predecessors, (46), 9 states have call successors, (46) [2021-11-25 18:25:17,790 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 166 transitions. [2021-11-25 18:25:17,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2021-11-25 18:25:17,791 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:25:17,792 INFO L514 BasicCegarLoop]: trace histogram [27, 26, 26, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:25:17,829 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-25 18:25:18,007 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-25 18:25:18,008 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:25:18,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:25:18,009 INFO L85 PathProgramCache]: Analyzing trace with hash -1140721900, now seen corresponding path program 4 times [2021-11-25 18:25:18,009 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:25:18,009 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1477411680] [2021-11-25 18:25:18,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:25:18,009 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:25:18,021 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:25:18,021 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1013009288] [2021-11-25 18:25:18,021 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:25:18,022 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:25:18,022 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:25:18,045 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:25:18,049 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 18:25:18,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:25:18,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 342 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-25 18:25:18,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:25:18,825 INFO L134 CoverageAnalysis]: Checked inductivity of 1432 backedges. 52 proven. 80 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2021-11-25 18:25:18,826 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:25:19,051 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:25:19,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1477411680] [2021-11-25 18:25:19,051 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 18:25:19,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1013009288] [2021-11-25 18:25:19,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1013009288] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:25:19,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [604262243] [2021-11-25 18:25:19,054 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-25 18:25:19,054 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:25:19,054 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:25:19,055 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:25:19,055 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:25:22,210 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-25 18:25:22,218 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:25:26,403 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10513#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 18:25:26,403 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:25:26,404 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:25:26,404 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-11-25 18:25:26,404 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876111520] [2021-11-25 18:25:26,404 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-25 18:25:26,405 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 18:25:26,405 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:25:26,405 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 18:25:26,406 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=551, Unknown=0, NotChecked=0, Total=650 [2021-11-25 18:25:26,406 INFO L87 Difference]: Start difference. First operand 158 states and 166 transitions. Second operand has 10 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 6 states have call successors, (27), 2 states have call predecessors, (27), 1 states have return successors, (26), 6 states have call predecessors, (26), 6 states have call successors, (26) [2021-11-25 18:25:26,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:25:26,724 INFO L93 Difference]: Finished difference Result 168 states and 178 transitions. [2021-11-25 18:25:26,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 18:25:26,725 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 6 states have call successors, (27), 2 states have call predecessors, (27), 1 states have return successors, (26), 6 states have call predecessors, (26), 6 states have call successors, (26) Word has length 150 [2021-11-25 18:25:26,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:25:26,727 INFO L225 Difference]: With dead ends: 168 [2021-11-25 18:25:26,727 INFO L226 Difference]: Without dead ends: 160 [2021-11-25 18:25:26,728 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 312 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=109, Invalid=647, Unknown=0, NotChecked=0, Total=756 [2021-11-25 18:25:26,729 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 6 mSDsluCounter, 368 mSDsCounter, 0 mSdLazyCounter, 273 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 421 SdHoareTripleChecker+Invalid, 294 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 273 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:25:26,729 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 421 Invalid, 294 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 273 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:25:26,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-11-25 18:25:26,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 160. [2021-11-25 18:25:26,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 98 states have (on average 1.030612244897959) internal successors, (101), 100 states have internal predecessors, (101), 35 states have call successors, (35), 26 states have call predecessors, (35), 26 states have return successors, (33), 33 states have call predecessors, (33), 33 states have call successors, (33) [2021-11-25 18:25:26,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 169 transitions. [2021-11-25 18:25:26,757 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 169 transitions. Word has length 150 [2021-11-25 18:25:26,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:25:26,758 INFO L470 AbstractCegarLoop]: Abstraction has 160 states and 169 transitions. [2021-11-25 18:25:26,758 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 6 states have call successors, (27), 2 states have call predecessors, (27), 1 states have return successors, (26), 6 states have call predecessors, (26), 6 states have call successors, (26) [2021-11-25 18:25:26,758 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 169 transitions. [2021-11-25 18:25:26,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2021-11-25 18:25:26,760 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:25:26,760 INFO L514 BasicCegarLoop]: trace histogram [27, 26, 26, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:25:26,807 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-25 18:25:26,983 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-25 18:25:26,984 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:25:26,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:25:26,985 INFO L85 PathProgramCache]: Analyzing trace with hash 1841961295, now seen corresponding path program 3 times [2021-11-25 18:25:26,985 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:25:26,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1586927651] [2021-11-25 18:25:26,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:25:26,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:25:26,998 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 18:25:26,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1771789282] [2021-11-25 18:25:26,999 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:25:26,999 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:25:27,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:25:27,008 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:25:27,009 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 18:25:27,105 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:25:27,105 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2021-11-25 18:25:27,105 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-11-25 18:25:27,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-25 18:25:27,205 INFO L133 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2021-11-25 18:25:27,205 INFO L628 BasicCegarLoop]: Counterexample is feasible [2021-11-25 18:25:27,206 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-11-25 18:25:27,250 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-25 18:25:27,431 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:25:27,435 INFO L732 BasicCegarLoop]: Path program histogram: [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:25:27,438 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-25 18:25:27,518 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.11 06:25:27 BoogieIcfgContainer [2021-11-25 18:25:27,531 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-25 18:25:27,532 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-25 18:25:27,532 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-25 18:25:27,532 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-25 18:25:27,533 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:22:54" (3/4) ... [2021-11-25 18:25:27,535 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-11-25 18:25:27,618 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/witness.graphml [2021-11-25 18:25:27,618 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-25 18:25:27,619 INFO L158 Benchmark]: Toolchain (without parser) took 153798.30ms. Allocated memory was 136.3MB in the beginning and 289.4MB in the end (delta: 153.1MB). Free memory was 100.9MB in the beginning and 216.5MB in the end (delta: -115.6MB). Peak memory consumption was 37.8MB. Max. memory is 16.1GB. [2021-11-25 18:25:27,620 INFO L158 Benchmark]: CDTParser took 0.24ms. Allocated memory is still 83.9MB. Free memory was 55.1MB in the beginning and 55.0MB in the end (delta: 30.4kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-25 18:25:27,620 INFO L158 Benchmark]: CACSL2BoogieTranslator took 307.83ms. Allocated memory is still 136.3MB. Free memory was 100.6MB in the beginning and 110.8MB in the end (delta: -10.2MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-11-25 18:25:27,620 INFO L158 Benchmark]: Boogie Procedure Inliner took 34.11ms. Allocated memory is still 136.3MB. Free memory was 110.8MB in the beginning and 109.5MB in the end (delta: 1.3MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-25 18:25:27,621 INFO L158 Benchmark]: Boogie Preprocessor took 23.64ms. Allocated memory is still 136.3MB. Free memory was 109.5MB in the beginning and 108.1MB in the end (delta: 1.4MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2021-11-25 18:25:27,621 INFO L158 Benchmark]: RCFGBuilder took 370.04ms. Allocated memory is still 136.3MB. Free memory was 108.1MB in the beginning and 97.7MB in the end (delta: 10.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-25 18:25:27,622 INFO L158 Benchmark]: TraceAbstraction took 152965.75ms. Allocated memory was 136.3MB in the beginning and 289.4MB in the end (delta: 153.1MB). Free memory was 97.0MB in the beginning and 222.8MB in the end (delta: -125.8MB). Peak memory consumption was 30.4MB. Max. memory is 16.1GB. [2021-11-25 18:25:27,622 INFO L158 Benchmark]: Witness Printer took 86.51ms. Allocated memory is still 289.4MB. Free memory was 222.8MB in the beginning and 216.5MB in the end (delta: 6.3MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2021-11-25 18:25:27,624 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24ms. Allocated memory is still 83.9MB. Free memory was 55.1MB in the beginning and 55.0MB in the end (delta: 30.4kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 307.83ms. Allocated memory is still 136.3MB. Free memory was 100.6MB in the beginning and 110.8MB in the end (delta: -10.2MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 34.11ms. Allocated memory is still 136.3MB. Free memory was 110.8MB in the beginning and 109.5MB in the end (delta: 1.3MB). There was no memory consumed. Max. memory is 16.1GB. * Boogie Preprocessor took 23.64ms. Allocated memory is still 136.3MB. Free memory was 109.5MB in the beginning and 108.1MB in the end (delta: 1.4MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * RCFGBuilder took 370.04ms. Allocated memory is still 136.3MB. Free memory was 108.1MB in the beginning and 97.7MB in the end (delta: 10.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * TraceAbstraction took 152965.75ms. Allocated memory was 136.3MB in the beginning and 289.4MB in the end (delta: 153.1MB). Free memory was 97.0MB in the beginning and 222.8MB in the end (delta: -125.8MB). Peak memory consumption was 30.4MB. Max. memory is 16.1GB. * Witness Printer took 86.51ms. Allocated memory is still 289.4MB. Free memory was 222.8MB in the beginning and 216.5MB in the end (delta: 6.3MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 17]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L22] int counter = 0; [L24] short a; [L25] long long n, x, y, z; [L26] a = __VERIFIER_nondet_ushort() [L28] n = 0 [L29] x = 0 [L30] y = 1 [L31] z = 6 VAL [a=5, counter=0, n=0, x=0, y=1, z=6] [L33] EXPR counter++ VAL [a=5, counter=1, counter++=0, n=0, x=0, y=1, z=6] [L33] COND TRUE counter++<5 [L34] CALL __VERIFIER_assert(z == 6 * n + 6) VAL [\old(cond)=1, counter=1] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=1] [L34] RET __VERIFIER_assert(z == 6 * n + 6) VAL [a=5, counter=1, n=0, x=0, y=1, z=6] [L35] CALL __VERIFIER_assert(y == 3 * n * n + 3 * n + 1) VAL [\old(cond)=1, counter=1] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=1] [L35] RET __VERIFIER_assert(y == 3 * n * n + 3 * n + 1) VAL [a=5, counter=1, n=0, x=0, y=1, z=6] [L36] CALL __VERIFIER_assert(x == n * n * n) VAL [\old(cond)=1, counter=1] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=1] [L36] RET __VERIFIER_assert(x == n * n * n) VAL [a=5, counter=1, n=0, x=0, y=1, z=6] [L37] CALL __VERIFIER_assert(y*z - 18*x - 12*y + 2*z - 6 == 0) VAL [\old(cond)=1, counter=1] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=1] [L37] RET __VERIFIER_assert(y*z - 18*x - 12*y + 2*z - 6 == 0) VAL [a=5, counter=1, n=0, x=0, y=1, z=6] [L38] CALL __VERIFIER_assert((z*z) - 12*y - 6*z + 12 == 0) VAL [\old(cond)=1, counter=1] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=1] [L38] RET __VERIFIER_assert((z*z) - 12*y - 6*z + 12 == 0) VAL [a=5, counter=1, n=0, x=0, y=1, z=6] [L39] COND FALSE !(!(n <= a)) [L42] n = n + 1 [L43] x = x + y [L44] y = y + z [L45] z = z + 6 VAL [a=5, counter=1, n=1, x=1, y=7, z=12] [L33] EXPR counter++ VAL [a=5, counter=2, counter++=1, n=1, x=1, y=7, z=12] [L33] COND TRUE counter++<5 [L34] CALL __VERIFIER_assert(z == 6 * n + 6) VAL [\old(cond)=1, counter=2] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=2] [L34] RET __VERIFIER_assert(z == 6 * n + 6) VAL [a=5, counter=2, n=1, x=1, y=7, z=12] [L35] CALL __VERIFIER_assert(y == 3 * n * n + 3 * n + 1) VAL [\old(cond)=1, counter=2] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=2] [L35] RET __VERIFIER_assert(y == 3 * n * n + 3 * n + 1) VAL [a=5, counter=2, n=1, x=1, y=7, z=12] [L36] CALL __VERIFIER_assert(x == n * n * n) VAL [\old(cond)=1, counter=2] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=2] [L36] RET __VERIFIER_assert(x == n * n * n) VAL [a=5, counter=2, n=1, x=1, y=7, z=12] [L37] CALL __VERIFIER_assert(y*z - 18*x - 12*y + 2*z - 6 == 0) VAL [\old(cond)=1, counter=2] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=2] [L37] RET __VERIFIER_assert(y*z - 18*x - 12*y + 2*z - 6 == 0) VAL [a=5, counter=2, n=1, x=1, y=7, z=12] [L38] CALL __VERIFIER_assert((z*z) - 12*y - 6*z + 12 == 0) VAL [\old(cond)=1, counter=2] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=2] [L38] RET __VERIFIER_assert((z*z) - 12*y - 6*z + 12 == 0) VAL [a=5, counter=2, n=1, x=1, y=7, z=12] [L39] COND FALSE !(!(n <= a)) [L42] n = n + 1 [L43] x = x + y [L44] y = y + z [L45] z = z + 6 VAL [a=5, counter=2, n=2, x=8, y=19, z=18] [L33] EXPR counter++ VAL [a=5, counter=3, counter++=2, n=2, x=8, y=19, z=18] [L33] COND TRUE counter++<5 [L34] CALL __VERIFIER_assert(z == 6 * n + 6) VAL [\old(cond)=1, counter=3] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=3] [L34] RET __VERIFIER_assert(z == 6 * n + 6) VAL [a=5, counter=3, n=2, x=8, y=19, z=18] [L35] CALL __VERIFIER_assert(y == 3 * n * n + 3 * n + 1) VAL [\old(cond)=1, counter=3] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=3] [L35] RET __VERIFIER_assert(y == 3 * n * n + 3 * n + 1) VAL [a=5, counter=3, n=2, x=8, y=19, z=18] [L36] CALL __VERIFIER_assert(x == n * n * n) VAL [\old(cond)=1, counter=3] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=3] [L36] RET __VERIFIER_assert(x == n * n * n) VAL [a=5, counter=3, n=2, x=8, y=19, z=18] [L37] CALL __VERIFIER_assert(y*z - 18*x - 12*y + 2*z - 6 == 0) VAL [\old(cond)=1, counter=3] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=3] [L37] RET __VERIFIER_assert(y*z - 18*x - 12*y + 2*z - 6 == 0) VAL [a=5, counter=3, n=2, x=8, y=19, z=18] [L38] CALL __VERIFIER_assert((z*z) - 12*y - 6*z + 12 == 0) VAL [\old(cond)=1, counter=3] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=3] [L38] RET __VERIFIER_assert((z*z) - 12*y - 6*z + 12 == 0) VAL [a=5, counter=3, n=2, x=8, y=19, z=18] [L39] COND FALSE !(!(n <= a)) [L42] n = n + 1 [L43] x = x + y [L44] y = y + z [L45] z = z + 6 VAL [a=5, counter=3, n=3, x=27, y=37, z=24] [L33] EXPR counter++ VAL [a=5, counter=4, counter++=3, n=3, x=27, y=37, z=24] [L33] COND TRUE counter++<5 [L34] CALL __VERIFIER_assert(z == 6 * n + 6) VAL [\old(cond)=1, counter=4] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=4] [L34] RET __VERIFIER_assert(z == 6 * n + 6) VAL [a=5, counter=4, n=3, x=27, y=37, z=24] [L35] CALL __VERIFIER_assert(y == 3 * n * n + 3 * n + 1) VAL [\old(cond)=1, counter=4] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=4] [L35] RET __VERIFIER_assert(y == 3 * n * n + 3 * n + 1) VAL [a=5, counter=4, n=3, x=27, y=37, z=24] [L36] CALL __VERIFIER_assert(x == n * n * n) VAL [\old(cond)=1, counter=4] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=4] [L36] RET __VERIFIER_assert(x == n * n * n) VAL [a=5, counter=4, n=3, x=27, y=37, z=24] [L37] CALL __VERIFIER_assert(y*z - 18*x - 12*y + 2*z - 6 == 0) VAL [\old(cond)=1, counter=4] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=4] [L37] RET __VERIFIER_assert(y*z - 18*x - 12*y + 2*z - 6 == 0) VAL [a=5, counter=4, n=3, x=27, y=37, z=24] [L38] CALL __VERIFIER_assert((z*z) - 12*y - 6*z + 12 == 0) VAL [\old(cond)=1, counter=4] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=4] [L38] RET __VERIFIER_assert((z*z) - 12*y - 6*z + 12 == 0) VAL [a=5, counter=4, n=3, x=27, y=37, z=24] [L39] COND FALSE !(!(n <= a)) [L42] n = n + 1 [L43] x = x + y [L44] y = y + z [L45] z = z + 6 VAL [a=5, counter=4, n=4, x=64, y=61, z=30] [L33] EXPR counter++ VAL [a=5, counter=5, counter++=4, n=4, x=64, y=61, z=30] [L33] COND TRUE counter++<5 [L34] CALL __VERIFIER_assert(z == 6 * n + 6) VAL [\old(cond)=1, counter=5] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=5] [L34] RET __VERIFIER_assert(z == 6 * n + 6) VAL [a=5, counter=5, n=4, x=64, y=61, z=30] [L35] CALL __VERIFIER_assert(y == 3 * n * n + 3 * n + 1) VAL [\old(cond)=1, counter=5] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=5] [L35] RET __VERIFIER_assert(y == 3 * n * n + 3 * n + 1) VAL [a=5, counter=5, n=4, x=64, y=61, z=30] [L36] CALL __VERIFIER_assert(x == n * n * n) VAL [\old(cond)=1, counter=5] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=5] [L36] RET __VERIFIER_assert(x == n * n * n) VAL [a=5, counter=5, n=4, x=64, y=61, z=30] [L37] CALL __VERIFIER_assert(y*z - 18*x - 12*y + 2*z - 6 == 0) VAL [\old(cond)=1, counter=5] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=5] [L37] RET __VERIFIER_assert(y*z - 18*x - 12*y + 2*z - 6 == 0) VAL [a=5, counter=5, n=4, x=64, y=61, z=30] [L38] CALL __VERIFIER_assert((z*z) - 12*y - 6*z + 12 == 0) VAL [\old(cond)=1, counter=5] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=5] [L38] RET __VERIFIER_assert((z*z) - 12*y - 6*z + 12 == 0) VAL [a=5, counter=5, n=4, x=64, y=61, z=30] [L39] COND FALSE !(!(n <= a)) [L42] n = n + 1 [L43] x = x + y [L44] y = y + z [L45] z = z + 6 VAL [a=5, counter=5, n=5, x=125, y=91, z=36] [L33] EXPR counter++ VAL [a=5, counter=6, counter++=5, n=5, x=125, y=91, z=36] [L33] COND FALSE !(counter++<5) [L48] CALL __VERIFIER_assert(z == 6*n + 6) VAL [\old(cond)=1, counter=6] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=6] [L48] RET __VERIFIER_assert(z == 6*n + 6) VAL [a=5, counter=6, n=5, x=125, y=91, z=36] [L49] CALL __VERIFIER_assert(6*a*x - x*z + 12*x == 0) VAL [\old(cond)=0, counter=6] [L15] COND TRUE !(cond) VAL [\old(cond)=0, cond=0, counter=6] [L17] reach_error() VAL [\old(cond)=0, cond=0, counter=6] - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 23 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 152.8s, OverallIterations: 19, TraceHistogramMax: 27, PathProgramHistogramMax: 4, EmptinessCheckTime: 0.0s, AutomataDifference: 41.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 10 mSolverCounterUnknown, 290 SdHoareTripleChecker+Valid, 29.0s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 234 mSDsluCounter, 3221 SdHoareTripleChecker+Invalid, 28.4s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 8 IncrementalHoareTripleChecker+Unchecked, 2574 mSDsCounter, 371 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 2347 IncrementalHoareTripleChecker+Invalid, 2736 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 371 mSolverCounterUnsat, 680 mSDtfsCounter, 2347 mSolverCounterSat, 0.1s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 2856 GetRequests, 2514 SyntacticMatches, 26 SemanticMatches, 316 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1847 ImplicationChecksByTransitivity, 57.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=160occurred in iteration=18, InterpolantAutomatonStates: 139, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.4s AutomataMinimizationTime, 18 MinimizatonAttempts, 40 StatesRemovedByMinimization, 8 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 1.0s SatisfiabilityAnalysisTime, 17.8s InterpolantComputationTime, 1261 NumberOfCodeBlocks, 1093 NumberOfCodeBlocksAsserted, 36 NumberOfCheckSat, 1586 ConstructedInterpolants, 1 QuantifiedInterpolants, 8206 SizeOfPredicates, 39 NumberOfNonLiveVariables, 2400 ConjunctsInSsa, 335 ConjunctsInUnsatCore, 25 InterpolantComputations, 6 PerfectInterpolantSequences, 8158/9302 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2021-11-25 18:25:27,674 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3f6300d5-2c73-4a67-b633-090e1c0f661d/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE