./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench/ps4-ll.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench/ps4-ll.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V --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 ef01badb7f90b6597aa83d48583be40b7afc9a4c054f915d626bd89be70c7009 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:04:14,801 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:04:14,803 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:04:14,837 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:04:14,838 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:04:14,839 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:04:14,841 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:04:14,844 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:04:14,846 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:04:14,848 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:04:14,849 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:04:14,851 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:04:14,852 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:04:14,853 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:04:14,855 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:04:14,857 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:04:14,859 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:04:14,860 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:04:14,863 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:04:14,866 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:04:14,868 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:04:14,876 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:04:14,878 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:04:14,880 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:04:14,888 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:04:14,892 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:04:14,893 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:04:14,894 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:04:14,896 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:04:14,898 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:04:14,898 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:04:14,900 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:04:14,902 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:04:14,903 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:04:14,905 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:04:14,906 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:04:14,906 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:04:14,907 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:04:14,907 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:04:14,908 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:04:14,910 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:04:14,911 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 03:04:14,944 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:04:14,944 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:04:14,944 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:04:14,945 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:04:14,945 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:04:14,945 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:04:14,946 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:04:14,946 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:04:14,946 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:04:14,946 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:04:14,947 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:04:14,947 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:04:14,947 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:04:14,947 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:04:14,947 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:04:14,948 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:04:14,948 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:04:14,948 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:04:14,949 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:04:14,949 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:04:14,949 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:04:14,949 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:04:14,950 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:04:14,950 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 03:04:14,950 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:04:14,950 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 03:04:14,951 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:04:14,951 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 03:04:14,951 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:04:14,951 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 03:04:14,951 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:04:14,952 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:04:14,952 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:04:14,952 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:04:14,952 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:04:14,952 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 03:04:14,953 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:04:14,953 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:04:14,953 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 03:04:14,953 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:04:14,953 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:04:14,954 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_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ef01badb7f90b6597aa83d48583be40b7afc9a4c054f915d626bd89be70c7009 [2021-11-23 03:04:15,291 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:04:15,324 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:04:15,328 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:04:15,329 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:04:15,330 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:04:15,331 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/nla-digbench/ps4-ll.c [2021-11-23 03:04:15,434 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/data/e9c04497a/d66141977f9643fa84f36bcd85ecf58b/FLAG9e7c39559 [2021-11-23 03:04:15,967 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:04:15,968 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/sv-benchmarks/c/nla-digbench/ps4-ll.c [2021-11-23 03:04:15,974 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/data/e9c04497a/d66141977f9643fa84f36bcd85ecf58b/FLAG9e7c39559 [2021-11-23 03:04:16,347 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/data/e9c04497a/d66141977f9643fa84f36bcd85ecf58b [2021-11-23 03:04:16,350 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:04:16,352 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:04:16,354 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:04:16,354 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:04:16,368 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:04:16,368 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:04:16" (1/1) ... [2021-11-23 03:04:16,370 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2d2e6919 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:04:16, skipping insertion in model container [2021-11-23 03:04:16,370 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:04:16" (1/1) ... [2021-11-23 03:04:16,382 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:04:16,396 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:04:16,592 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_93faadd9-d79e-460f-a08c-2be3511ea4ae/sv-benchmarks/c/nla-digbench/ps4-ll.c[458,471] [2021-11-23 03:04:16,608 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:04:16,615 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:04:16,627 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_93faadd9-d79e-460f-a08c-2be3511ea4ae/sv-benchmarks/c/nla-digbench/ps4-ll.c[458,471] [2021-11-23 03:04:16,633 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:04:16,644 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:04:16,645 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:04:16 WrapperNode [2021-11-23 03:04:16,645 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:04:16,646 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:04:16,646 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:04:16,646 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:04:16,655 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:04:16" (1/1) ... [2021-11-23 03:04:16,662 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:04:16" (1/1) ... [2021-11-23 03:04:16,681 INFO L137 Inliner]: procedures = 14, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 34 [2021-11-23 03:04:16,682 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:04:16,683 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:04:16,683 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:04:16,683 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:04:16,692 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:04:16" (1/1) ... [2021-11-23 03:04:16,692 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:04:16" (1/1) ... [2021-11-23 03:04:16,694 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:04:16" (1/1) ... [2021-11-23 03:04:16,694 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:04:16" (1/1) ... [2021-11-23 03:04:16,697 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:04:16" (1/1) ... [2021-11-23 03:04:16,701 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:04:16" (1/1) ... [2021-11-23 03:04:16,702 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:04:16" (1/1) ... [2021-11-23 03:04:16,704 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:04:16,705 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:04:16,705 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:04:16,705 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:04:16,706 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:04:16" (1/1) ... [2021-11-23 03:04:16,715 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:04:16,730 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:04:16,744 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:04:16,758 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:04:16,792 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:04:16,792 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 03:04:16,792 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:04:16,792 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:04:16,793 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-23 03:04:16,793 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-23 03:04:16,859 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:04:16,862 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:04:17,040 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:04:17,072 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:04:17,072 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 03:04:17,075 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:04:17 BoogieIcfgContainer [2021-11-23 03:04:17,075 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:04:17,077 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:04:17,077 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:04:17,091 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:04:17,091 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:04:16" (1/3) ... [2021-11-23 03:04:17,092 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@33e57108 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:04:17, skipping insertion in model container [2021-11-23 03:04:17,093 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:04:16" (2/3) ... [2021-11-23 03:04:17,093 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@33e57108 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:04:17, skipping insertion in model container [2021-11-23 03:04:17,093 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:04:17" (3/3) ... [2021-11-23 03:04:17,095 INFO L111 eAbstractionObserver]: Analyzing ICFG ps4-ll.c [2021-11-23 03:04:17,101 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:04:17,101 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 03:04:17,158 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:04:17,171 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 [2021-11-23 03:04:17,171 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 03:04:17,204 INFO L276 IsEmpty]: Start isEmpty. Operand has 14 states, 8 states have (on average 1.5) internal successors, (12), 9 states have internal predecessors, (12), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 03:04:17,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-23 03:04:17,210 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:04:17,211 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-23 03:04:17,212 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:04:17,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:04:17,225 INFO L85 PathProgramCache]: Analyzing trace with hash -2107834122, now seen corresponding path program 1 times [2021-11-23 03:04:17,235 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:04:17,236 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2071780734] [2021-11-23 03:04:17,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:04:17,237 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:04:17,345 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:04:17,347 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1853663163] [2021-11-23 03:04:17,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:04:17,348 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:04:17,348 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:04:17,352 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:04:17,378 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 03:04:17,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:04:17,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 03:04:17,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:04:17,643 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:04:17,644 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:04:17,644 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:04:17,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2071780734] [2021-11-23 03:04:17,645 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:04:17,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1853663163] [2021-11-23 03:04:17,646 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1853663163] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:04:17,646 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:04:17,646 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:04:17,648 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490855877] [2021-11-23 03:04:17,649 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:04:17,654 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:04:17,654 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:04:17,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:04:17,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:04:17,699 INFO L87 Difference]: Start difference. First operand has 14 states, 8 states have (on average 1.5) internal successors, (12), 9 states have internal predecessors, (12), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 5 states, 5 states have (on average 1.0) internal successors, (5), 3 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) [2021-11-23 03:04:17,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:04:17,842 INFO L93 Difference]: Finished difference Result 38 states and 56 transitions. [2021-11-23 03:04:17,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:04:17,845 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.0) internal successors, (5), 3 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 [2021-11-23 03:04:17,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:04:17,855 INFO L225 Difference]: With dead ends: 38 [2021-11-23 03:04:17,855 INFO L226 Difference]: Without dead ends: 19 [2021-11-23 03:04:17,860 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:04:17,867 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 7 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:04:17,869 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 41 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:04:17,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-11-23 03:04:17,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-11-23 03:04:17,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 13 states have internal predecessors, (14), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 03:04:17,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2021-11-23 03:04:17,921 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 6 [2021-11-23 03:04:17,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:04:17,922 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2021-11-23 03:04:17,922 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.0) internal successors, (5), 3 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) [2021-11-23 03:04:17,923 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2021-11-23 03:04:17,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-23 03:04:17,925 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:04:17,925 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:04:17,966 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 03:04:18,142 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-11-23 03:04:18,143 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:04:18,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:04:18,144 INFO L85 PathProgramCache]: Analyzing trace with hash 1994540258, now seen corresponding path program 1 times [2021-11-23 03:04:18,144 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:04:18,144 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2122107539] [2021-11-23 03:04:18,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:04:18,145 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:04:18,154 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:04:18,154 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1442355561] [2021-11-23 03:04:18,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:04:18,155 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:04:18,155 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:04:18,156 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:04:18,158 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 03:04:18,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:04:18,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 03:04:18,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:04:18,365 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:04:18,366 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:04:18,595 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:04:18,596 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:04:18,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2122107539] [2021-11-23 03:04:18,596 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:04:18,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1442355561] [2021-11-23 03:04:18,597 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1442355561] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 03:04:18,597 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:04:18,597 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2021-11-23 03:04:18,598 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407200925] [2021-11-23 03:04:18,598 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:04:18,599 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:04:18,599 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:04:18,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:04:18,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:04:18,601 INFO L87 Difference]: Start difference. First operand 19 states and 21 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) [2021-11-23 03:04:18,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:04:18,641 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2021-11-23 03:04:18,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:04:18,641 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 13 [2021-11-23 03:04:18,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:04:18,643 INFO L225 Difference]: With dead ends: 25 [2021-11-23 03:04:18,643 INFO L226 Difference]: Without dead ends: 20 [2021-11-23 03:04:18,643 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-23 03:04:18,645 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 6 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:04:18,646 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 30 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:04:18,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-23 03:04:18,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-11-23 03:04:18,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 14 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:04:18,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2021-11-23 03:04:18,657 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 13 [2021-11-23 03:04:18,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:04:18,658 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2021-11-23 03:04:18,658 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) [2021-11-23 03:04:18,658 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2021-11-23 03:04:18,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-23 03:04:18,659 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:04:18,659 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-11-23 03:04:18,698 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 03:04:18,886 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:04:18,887 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:04:18,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:04:18,888 INFO L85 PathProgramCache]: Analyzing trace with hash 1941411007, now seen corresponding path program 1 times [2021-11-23 03:04:18,888 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:04:18,888 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1609371477] [2021-11-23 03:04:18,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:04:18,888 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:04:18,896 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:04:18,897 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [109711561] [2021-11-23 03:04:18,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:04:18,897 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:04:18,897 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:04:18,902 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:04:18,918 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 03:04:18,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:04:18,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 03:04:18,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:04:19,193 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:04:19,193 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:04:19,496 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:04:19,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1609371477] [2021-11-23 03:04:19,496 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:04:19,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [109711561] [2021-11-23 03:04:19,497 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [109711561] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:04:19,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [732083302] [2021-11-23 03:04:19,517 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:04:19,518 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:04:19,522 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:04:19,528 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:04:19,528 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:04:20,656 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2021-11-23 03:04:21,042 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:04:21,768 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '368#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_14| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_18| Int)) (and (= |__VERIFIER_assert_#in~cond| (ite (= (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_18| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_18| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_18| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_18|) (* 2 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_18| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_18| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_18|)) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_18| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_18|)) (* 4 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_14|)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_18|) (or (and (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_14| 0) (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_18| 0) (= |#NULL.offset| 0) (= |#NULL.base| 0)) (and (= |#NULL.offset| 0) (= |#NULL.base| 0))) (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_14|))) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:04:21,769 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:04:21,769 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:04:21,769 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-11-23 03:04:21,769 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1963227508] [2021-11-23 03:04:21,769 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:04:21,770 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 03:04:21,770 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:04:21,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 03:04:21,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2021-11-23 03:04:21,772 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:04:21,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:04:21,883 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2021-11-23 03:04:21,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 03:04:21,884 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 19 [2021-11-23 03:04:21,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:04:21,885 INFO L225 Difference]: With dead ends: 28 [2021-11-23 03:04:21,885 INFO L226 Difference]: Without dead ends: 23 [2021-11-23 03:04:21,886 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2021-11-23 03:04:21,888 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 2 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:04:21,888 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 63 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:04:21,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-23 03:04:21,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-11-23 03:04:21,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 16 states have (on average 1.0625) internal successors, (17), 16 states have internal predecessors, (17), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 03:04:21,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2021-11-23 03:04:21,902 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 19 [2021-11-23 03:04:21,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:04:21,903 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2021-11-23 03:04:21,903 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:04:21,903 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2021-11-23 03:04:21,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-23 03:04:21,905 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:04:21,905 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1] [2021-11-23 03:04:21,946 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 03:04:22,126 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:04:22,127 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:04:22,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:04:22,127 INFO L85 PathProgramCache]: Analyzing trace with hash 59576403, now seen corresponding path program 2 times [2021-11-23 03:04:22,128 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:04:22,128 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [84736451] [2021-11-23 03:04:22,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:04:22,128 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:04:22,135 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:04:22,136 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [880997847] [2021-11-23 03:04:22,136 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:04:22,136 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:04:22,137 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:04:22,138 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:04:22,158 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 03:04:22,211 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 03:04:22,211 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:04:22,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 03:04:22,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:04:22,384 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 03:04:22,384 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:04:22,567 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:04:22,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [84736451] [2021-11-23 03:04:22,568 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:04:22,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [880997847] [2021-11-23 03:04:22,568 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [880997847] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:04:22,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1109068743] [2021-11-23 03:04:22,571 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:04:22,572 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:04:22,572 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:04:22,573 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:04:22,573 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:04:23,570 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 96 for LOIs [2021-11-23 03:04:24,777 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:04:25,487 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '577#(and (exists ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_33| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_24| Int)) (and (= |__VERIFIER_assert_#in~cond| (ite (= (* 4 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_24|) (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_33| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_33|) (* 2 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_33| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_33| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_33|)) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_33| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_33| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_33| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_33|))) 1 0)) (or (and (<= 0 |#NULL.base|) (or (and (= |#NULL.offset| 0) (= |#NULL.base| 0)) (and (= (select |#length| 3) 12) (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_24| 0) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= 9 (select |#length| 2)) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_33| 0) (= (select (select |#memory_int| 1) 1) 0) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0))) (<= |#NULL.offset| 0) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_33|) (<= |#NULL.base| 0) (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_24|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|)) (and (<= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_24| 0) (<= 0 |#NULL.base|) (or (and (= |#NULL.offset| 0) (= |#NULL.base| 0)) (and (= (select |#length| 3) 12) (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_24| 0) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= 9 (select |#length| 2)) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_33| 0) (= (select (select |#memory_int| 1) 1) 0) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0))) (<= |#NULL.offset| 0) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_33|) (<= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_33| 0) (<= |#NULL.base| 0) (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_24|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0))' at error location [2021-11-23 03:04:25,487 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:04:25,488 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:04:25,488 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-11-23 03:04:25,488 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1198674818] [2021-11-23 03:04:25,488 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:04:25,489 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 03:04:25,489 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:04:25,489 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 03:04:25,489 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=256, Unknown=0, NotChecked=0, Total=306 [2021-11-23 03:04:25,490 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 03:04:25,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:04:25,603 INFO L93 Difference]: Finished difference Result 31 states and 33 transitions. [2021-11-23 03:04:25,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 03:04:25,603 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 26 [2021-11-23 03:04:25,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:04:25,604 INFO L225 Difference]: With dead ends: 31 [2021-11-23 03:04:25,604 INFO L226 Difference]: Without dead ends: 26 [2021-11-23 03:04:25,604 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=61, Invalid=319, Unknown=0, NotChecked=0, Total=380 [2021-11-23 03:04:25,606 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 2 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:04:25,606 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 89 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:04:25,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-23 03:04:25,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-11-23 03:04:25,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 18 states have (on average 1.0555555555555556) internal successors, (19), 18 states have internal predecessors, (19), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-23 03:04:25,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2021-11-23 03:04:25,613 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 26 [2021-11-23 03:04:25,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:04:25,614 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2021-11-23 03:04:25,614 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 03:04:25,614 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2021-11-23 03:04:25,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-23 03:04:25,615 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:04:25,616 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1] [2021-11-23 03:04:25,657 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 03:04:25,834 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:04:25,835 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:04:25,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:04:25,835 INFO L85 PathProgramCache]: Analyzing trace with hash 685057599, now seen corresponding path program 3 times [2021-11-23 03:04:25,835 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:04:25,836 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [696198159] [2021-11-23 03:04:25,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:04:25,836 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:04:25,843 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:04:25,843 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [867935715] [2021-11-23 03:04:25,843 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:04:25,843 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:04:25,844 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:04:25,850 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:04:25,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 03:04:26,025 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:04:26,026 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:04:26,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 03:04:26,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:04:26,250 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 18 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 03:04:26,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:04:26,437 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:04:26,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [696198159] [2021-11-23 03:04:26,437 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:04:26,438 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [867935715] [2021-11-23 03:04:26,438 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [867935715] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:04:26,438 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [40699835] [2021-11-23 03:04:26,448 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:04:26,449 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:04:26,449 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:04:26,450 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:04:26,450 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:04:27,105 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2021-11-23 03:04:27,393 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:04:28,106 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '818#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:04:28,106 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:04:28,106 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:04:28,106 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-11-23 03:04:28,106 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984808861] [2021-11-23 03:04:28,107 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:04:28,107 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 03:04:28,107 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:04:28,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 03:04:28,108 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=289, Unknown=0, NotChecked=0, Total=342 [2021-11-23 03:04:28,108 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand has 9 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-23 03:04:28,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:04:28,218 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2021-11-23 03:04:28,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 03:04:28,219 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 33 [2021-11-23 03:04:28,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:04:28,220 INFO L225 Difference]: With dead ends: 34 [2021-11-23 03:04:28,220 INFO L226 Difference]: Without dead ends: 29 [2021-11-23 03:04:28,221 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=64, Invalid=356, Unknown=0, NotChecked=0, Total=420 [2021-11-23 03:04:28,222 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 2 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:04:28,223 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 119 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:04:28,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-11-23 03:04:28,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-11-23 03:04:28,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 20 states have (on average 1.05) internal successors, (21), 20 states have internal predecessors, (21), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-23 03:04:28,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2021-11-23 03:04:28,230 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 33 [2021-11-23 03:04:28,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:04:28,231 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2021-11-23 03:04:28,231 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-23 03:04:28,231 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2021-11-23 03:04:28,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-23 03:04:28,232 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:04:28,233 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1] [2021-11-23 03:04:28,240 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 03:04:28,440 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:04:28,440 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:04:28,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:04:28,441 INFO L85 PathProgramCache]: Analyzing trace with hash 1053871827, now seen corresponding path program 4 times [2021-11-23 03:04:28,441 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:04:28,441 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [271123445] [2021-11-23 03:04:28,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:04:28,441 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:04:28,448 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:04:28,448 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [261923650] [2021-11-23 03:04:28,449 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:04:28,449 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:04:28,449 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:04:28,463 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:04:28,466 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 03:04:28,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:04:28,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 03:04:28,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:04:28,750 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 03:04:28,750 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:04:28,929 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:04:28,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [271123445] [2021-11-23 03:04:28,929 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:04:28,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [261923650] [2021-11-23 03:04:28,930 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [261923650] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:04:28,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [843741670] [2021-11-23 03:04:28,933 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:04:28,933 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:04:28,933 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:04:28,934 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:04:28,934 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:04:29,815 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 96 for LOIs [2021-11-23 03:04:30,810 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:04:31,532 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1091#(and (exists ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_66| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_44| Int)) (and (or (and (<= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_44| 0) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_66|) (<= 0 |#NULL.base|) (<= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_66| 0) (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_44|) (<= |#NULL.offset| 0) (<= |#NULL.base| 0) (or (and (= (select |#length| 3) 12) (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_66| 0) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= 9 (select |#length| 2)) (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_44| 0) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0)) (and (= |#NULL.offset| 0) (= |#NULL.base| 0))) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|)) (and (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_66|) (<= 0 |#NULL.base|) (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_44|) (<= |#NULL.offset| 0) (<= |#NULL.base| 0) (or (and (= (select |#length| 3) 12) (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_66| 0) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= 9 (select |#length| 2)) (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_44| 0) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0)) (and (= |#NULL.offset| 0) (= |#NULL.base| 0))) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))) (= (ite (= (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_66| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_66|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_66| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_66| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_66| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_66|) (* 2 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_66| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_66| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_66|))) (* 4 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_44|)) 1 0) |__VERIFIER_assert_#in~cond|))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0))' at error location [2021-11-23 03:04:31,533 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:04:31,533 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:04:31,533 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-11-23 03:04:31,533 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707899286] [2021-11-23 03:04:31,534 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:04:31,534 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 03:04:31,534 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:04:31,535 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 03:04:31,535 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=324, Unknown=0, NotChecked=0, Total=380 [2021-11-23 03:04:31,535 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand has 10 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 9 states have internal predecessors, (17), 6 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-23 03:04:31,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:04:31,693 INFO L93 Difference]: Finished difference Result 37 states and 41 transitions. [2021-11-23 03:04:31,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 03:04:31,694 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 9 states have internal predecessors, (17), 6 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 40 [2021-11-23 03:04:31,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:04:31,695 INFO L225 Difference]: With dead ends: 37 [2021-11-23 03:04:31,695 INFO L226 Difference]: Without dead ends: 32 [2021-11-23 03:04:31,696 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=67, Invalid=395, Unknown=0, NotChecked=0, Total=462 [2021-11-23 03:04:31,697 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 2 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:04:31,697 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 153 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:04:31,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-23 03:04:31,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-11-23 03:04:31,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 22 states have (on average 1.0454545454545454) internal successors, (23), 22 states have internal predecessors, (23), 7 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-23 03:04:31,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2021-11-23 03:04:31,707 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 40 [2021-11-23 03:04:31,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:04:31,707 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2021-11-23 03:04:31,708 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 9 states have internal predecessors, (17), 6 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-23 03:04:31,708 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2021-11-23 03:04:31,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 03:04:31,710 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:04:31,710 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1] [2021-11-23 03:04:31,753 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 03:04:31,925 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-23 03:04:31,926 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:04:31,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:04:31,926 INFO L85 PathProgramCache]: Analyzing trace with hash 1544951743, now seen corresponding path program 5 times [2021-11-23 03:04:31,926 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:04:31,926 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [967347112] [2021-11-23 03:04:31,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:04:31,926 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:04:31,933 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:04:31,933 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [94980582] [2021-11-23 03:04:31,933 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:04:31,933 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:04:31,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:04:31,934 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:04:31,937 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 03:04:32,219 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-23 03:04:32,219 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:04:32,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 03:04:32,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:04:32,472 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 12 proven. 45 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-23 03:04:32,472 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:04:32,653 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:04:32,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [967347112] [2021-11-23 03:04:32,654 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:04:32,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [94980582] [2021-11-23 03:04:32,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [94980582] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:04:32,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1010598563] [2021-11-23 03:04:32,656 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:04:32,657 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:04:32,657 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:04:32,657 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:04:32,657 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:04:33,456 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 96 for LOIs [2021-11-23 03:04:34,610 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:04:35,548 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1396#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_64| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_83| Int)) (and (<= 0 (+ |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_64| 32768)) (or (and (<= |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_64| 1) (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_83| 1) (= |#NULL.offset| 0) (= |#NULL.base| 0)) (and (= |#NULL.offset| 0) (= |#NULL.base| 0))) (<= |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_64| 32767) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_83|) (= (ite (= (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_83| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_83|) (* |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_64| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_83|)) 1 0) |__VERIFIER_assert_#in~cond|))) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:04:35,548 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:04:35,548 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:04:35,548 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-11-23 03:04:35,549 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499714156] [2021-11-23 03:04:35,549 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:04:35,549 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-23 03:04:35,549 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:04:35,550 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-23 03:04:35,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2021-11-23 03:04:35,550 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand has 11 states, 10 states have (on average 1.9) internal successors, (19), 10 states have internal predecessors, (19), 7 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-23 03:04:35,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:04:35,735 INFO L93 Difference]: Finished difference Result 40 states and 45 transitions. [2021-11-23 03:04:35,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 03:04:35,736 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.9) internal successors, (19), 10 states have internal predecessors, (19), 7 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 47 [2021-11-23 03:04:35,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:04:35,738 INFO L225 Difference]: With dead ends: 40 [2021-11-23 03:04:35,738 INFO L226 Difference]: Without dead ends: 35 [2021-11-23 03:04:35,739 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 86 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=70, Invalid=436, Unknown=0, NotChecked=0, Total=506 [2021-11-23 03:04:35,740 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 2 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:04:35,740 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 191 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:04:35,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-23 03:04:35,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-11-23 03:04:35,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 24 states have (on average 1.0416666666666667) internal successors, (25), 24 states have internal predecessors, (25), 8 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-23 03:04:35,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 40 transitions. [2021-11-23 03:04:35,750 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 40 transitions. Word has length 47 [2021-11-23 03:04:35,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:04:35,751 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 40 transitions. [2021-11-23 03:04:35,751 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.9) internal successors, (19), 10 states have internal predecessors, (19), 7 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-23 03:04:35,751 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 40 transitions. [2021-11-23 03:04:35,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 03:04:35,754 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:04:35,754 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1] [2021-11-23 03:04:35,770 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 03:04:35,960 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-23 03:04:35,960 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:04:35,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:04:35,961 INFO L85 PathProgramCache]: Analyzing trace with hash -815452845, now seen corresponding path program 6 times [2021-11-23 03:04:35,961 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:04:35,961 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [354833960] [2021-11-23 03:04:35,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:04:35,961 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:04:35,984 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:04:35,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1895624928] [2021-11-23 03:04:35,985 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:04:35,985 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:04:35,986 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:04:35,987 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:04:36,002 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 03:04:36,350 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:04:36,350 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:04:36,352 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 03:04:36,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:04:36,648 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 14 proven. 63 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-23 03:04:36,648 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:04:36,890 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:04:36,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [354833960] [2021-11-23 03:04:36,890 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:04:36,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1895624928] [2021-11-23 03:04:36,891 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1895624928] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:04:36,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [767556335] [2021-11-23 03:04:36,894 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:04:36,894 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:04:36,895 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:04:36,895 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:04:36,895 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:04:37,732 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 96 for LOIs [2021-11-23 03:04:38,686 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:04:39,414 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1733#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_77| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_102| Int)) (and (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_102|) (<= 0 (+ |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_77| 32768)) (= (ite (= (* |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_77| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_102|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_102| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_102|)) 1 0) |__VERIFIER_assert_#in~cond|) (<= |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_77| 32767) (or (and (<= |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_77| 1) (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_102| 1) (= |#NULL.offset| 0) (= |#NULL.base| 0)) (and (= |#NULL.offset| 0) (= |#NULL.base| 0))))) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:04:39,414 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:04:39,414 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:04:39,414 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-11-23 03:04:39,414 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644368617] [2021-11-23 03:04:39,414 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:04:39,415 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-23 03:04:39,415 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:04:39,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-23 03:04:39,416 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=400, Unknown=0, NotChecked=0, Total=462 [2021-11-23 03:04:39,416 INFO L87 Difference]: Start difference. First operand 35 states and 40 transitions. Second operand has 12 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 8 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-23 03:04:39,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:04:39,607 INFO L93 Difference]: Finished difference Result 43 states and 49 transitions. [2021-11-23 03:04:39,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 03:04:39,608 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 8 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 54 [2021-11-23 03:04:39,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:04:39,609 INFO L225 Difference]: With dead ends: 43 [2021-11-23 03:04:39,609 INFO L226 Difference]: Without dead ends: 38 [2021-11-23 03:04:39,610 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 99 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=73, Invalid=479, Unknown=0, NotChecked=0, Total=552 [2021-11-23 03:04:39,611 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 2 mSDsluCounter, 207 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 233 SdHoareTripleChecker+Invalid, 162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:04:39,611 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 233 Invalid, 162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 162 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:04:39,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-23 03:04:39,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-11-23 03:04:39,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 26 states have internal predecessors, (27), 9 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-23 03:04:39,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 44 transitions. [2021-11-23 03:04:39,619 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 44 transitions. Word has length 54 [2021-11-23 03:04:39,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:04:39,620 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 44 transitions. [2021-11-23 03:04:39,620 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 8 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-23 03:04:39,620 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 44 transitions. [2021-11-23 03:04:39,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 03:04:39,622 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:04:39,622 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 7, 1, 1, 1, 1, 1] [2021-11-23 03:04:39,632 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 03:04:39,827 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:04:39,827 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:04:39,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:04:39,827 INFO L85 PathProgramCache]: Analyzing trace with hash 1544710463, now seen corresponding path program 7 times [2021-11-23 03:04:39,827 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:04:39,827 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1738364934] [2021-11-23 03:04:39,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:04:39,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:04:39,833 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:04:39,834 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1128925109] [2021-11-23 03:04:39,834 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:04:39,834 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:04:39,834 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:04:39,854 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:04:39,889 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 03:04:40,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:04:40,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-23 03:04:40,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:04:40,596 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 16 proven. 84 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-23 03:04:40,596 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:04:40,733 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:04:40,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1738364934] [2021-11-23 03:04:40,733 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:04:40,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1128925109] [2021-11-23 03:04:40,733 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1128925109] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:04:40,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [111506265] [2021-11-23 03:04:40,735 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:04:40,735 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:04:40,735 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:04:40,736 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:04:40,736 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:04:41,205 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2021-11-23 03:04:41,428 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:04:42,087 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2102#(and (exists ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_123| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_74| Int)) (and (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_74|) (or (and (= |#NULL.offset| 0) (= |#NULL.base| 0)) (and (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_74| 0) (= |#NULL.offset| 0) (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_123| 0) (= |#NULL.base| 0))) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_123|) (= |__VERIFIER_assert_#in~cond| (ite (= (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_123| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_123|) (* 2 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_123| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_123| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_123|)) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_123| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_123| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_123| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_123|)) (* 4 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_74|)) 1 0)))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:04:42,087 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:04:42,087 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:04:42,087 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-11-23 03:04:42,087 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659131495] [2021-11-23 03:04:42,088 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:04:42,088 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-23 03:04:42,088 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:04:42,089 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-23 03:04:42,089 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=441, Unknown=0, NotChecked=0, Total=506 [2021-11-23 03:04:42,089 INFO L87 Difference]: Start difference. First operand 38 states and 44 transitions. Second operand has 13 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 9 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-23 03:04:42,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:04:42,359 INFO L93 Difference]: Finished difference Result 46 states and 53 transitions. [2021-11-23 03:04:42,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 03:04:42,360 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 9 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Word has length 61 [2021-11-23 03:04:42,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:04:42,361 INFO L225 Difference]: With dead ends: 46 [2021-11-23 03:04:42,361 INFO L226 Difference]: Without dead ends: 41 [2021-11-23 03:04:42,362 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 112 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=76, Invalid=524, Unknown=0, NotChecked=0, Total=600 [2021-11-23 03:04:42,363 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 2 mSDsluCounter, 250 mSDsCounter, 0 mSdLazyCounter, 199 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 199 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 199 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:04:42,363 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 279 Invalid, 199 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 199 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:04:42,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-23 03:04:42,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-11-23 03:04:42,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 28 states have (on average 1.0357142857142858) internal successors, (29), 28 states have internal predecessors, (29), 10 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-23 03:04:42,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 48 transitions. [2021-11-23 03:04:42,381 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 48 transitions. Word has length 61 [2021-11-23 03:04:42,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:04:42,382 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 48 transitions. [2021-11-23 03:04:42,382 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 9 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-23 03:04:42,382 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 48 transitions. [2021-11-23 03:04:42,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 03:04:42,384 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:04:42,384 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1] [2021-11-23 03:04:42,394 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 03:04:42,589 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:04:42,589 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:04:42,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:04:42,590 INFO L85 PathProgramCache]: Analyzing trace with hash 1269967827, now seen corresponding path program 8 times [2021-11-23 03:04:42,590 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:04:42,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [283480215] [2021-11-23 03:04:42,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:04:42,590 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:04:42,597 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:04:42,598 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [972887208] [2021-11-23 03:04:42,599 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:04:42,599 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:04:42,599 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:04:42,600 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:04:42,625 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 03:04:43,026 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-23 03:04:43,026 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:04:43,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-23 03:04:43,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:04:43,373 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 18 proven. 108 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-11-23 03:04:43,373 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:04:43,538 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:04:43,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [283480215] [2021-11-23 03:04:43,540 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:04:43,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [972887208] [2021-11-23 03:04:43,540 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [972887208] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:04:43,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1579156423] [2021-11-23 03:04:43,541 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:04:43,542 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:04:43,542 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:04:43,542 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:04:43,542 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:04:43,943 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2021-11-23 03:04:44,164 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:04:44,703 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2503#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:04:44,703 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:04:44,703 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:04:44,703 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-11-23 03:04:44,704 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [335363354] [2021-11-23 03:04:44,704 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:04:44,704 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 03:04:44,705 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:04:44,705 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 03:04:44,705 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=484, Unknown=0, NotChecked=0, Total=552 [2021-11-23 03:04:44,706 INFO L87 Difference]: Start difference. First operand 41 states and 48 transitions. Second operand has 14 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 10 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-23 03:04:44,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:04:44,965 INFO L93 Difference]: Finished difference Result 49 states and 57 transitions. [2021-11-23 03:04:44,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 03:04:44,966 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 10 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Word has length 68 [2021-11-23 03:04:44,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:04:44,967 INFO L225 Difference]: With dead ends: 49 [2021-11-23 03:04:44,967 INFO L226 Difference]: Without dead ends: 44 [2021-11-23 03:04:44,968 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 125 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=79, Invalid=571, Unknown=0, NotChecked=0, Total=650 [2021-11-23 03:04:44,969 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 2 mSDsluCounter, 297 mSDsCounter, 0 mSdLazyCounter, 240 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 329 SdHoareTripleChecker+Invalid, 240 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 240 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:04:44,969 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 329 Invalid, 240 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 240 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:04:44,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-23 03:04:44,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-11-23 03:04:44,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 30 states have (on average 1.0333333333333334) internal successors, (31), 30 states have internal predecessors, (31), 11 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-23 03:04:44,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 52 transitions. [2021-11-23 03:04:44,977 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 52 transitions. Word has length 68 [2021-11-23 03:04:44,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:04:44,978 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 52 transitions. [2021-11-23 03:04:44,979 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 10 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-23 03:04:44,979 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 52 transitions. [2021-11-23 03:04:44,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-23 03:04:44,980 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:04:44,981 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 9, 1, 1, 1, 1, 1] [2021-11-23 03:04:44,991 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 03:04:45,186 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-23 03:04:45,187 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:04:45,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:04:45,187 INFO L85 PathProgramCache]: Analyzing trace with hash 224533183, now seen corresponding path program 9 times [2021-11-23 03:04:45,187 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:04:45,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1785748989] [2021-11-23 03:04:45,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:04:45,188 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:04:45,201 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:04:45,201 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [877928001] [2021-11-23 03:04:45,201 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:04:45,201 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:04:45,202 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:04:45,203 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:04:45,230 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 03:04:46,400 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:04:46,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:04:46,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-23 03:04:46,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:04:46,746 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 20 proven. 135 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-11-23 03:04:46,746 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:04:46,890 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:04:46,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1785748989] [2021-11-23 03:04:46,890 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:04:46,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [877928001] [2021-11-23 03:04:46,891 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [877928001] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:04:46,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1959229196] [2021-11-23 03:04:46,892 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:04:46,893 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:04:46,893 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:04:46,893 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:04:46,893 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:04:47,354 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2021-11-23 03:04:47,557 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:04:48,215 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2936#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_166| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_94| Int)) (and (= |__VERIFIER_assert_#in~cond| (ite (= (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_166| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_166|) (* 2 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_166| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_166| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_166|)) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_166| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_166| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_166| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_166|)) (* 4 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_94|)) 1 0)) (or (and (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_94| 0) (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_166| 0) (= |#NULL.offset| 0) (= |#NULL.base| 0)) (and (= |#NULL.offset| 0) (= |#NULL.base| 0))) (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_94|) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_166|))) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:04:48,215 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:04:48,215 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:04:48,215 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-11-23 03:04:48,216 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [21632336] [2021-11-23 03:04:48,216 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:04:48,216 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-23 03:04:48,216 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:04:48,216 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-23 03:04:48,217 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=529, Unknown=0, NotChecked=0, Total=600 [2021-11-23 03:04:48,217 INFO L87 Difference]: Start difference. First operand 44 states and 52 transitions. Second operand has 15 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 11 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-23 03:04:48,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:04:48,481 INFO L93 Difference]: Finished difference Result 52 states and 61 transitions. [2021-11-23 03:04:48,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 03:04:48,482 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 11 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Word has length 75 [2021-11-23 03:04:48,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:04:48,483 INFO L225 Difference]: With dead ends: 52 [2021-11-23 03:04:48,483 INFO L226 Difference]: Without dead ends: 47 [2021-11-23 03:04:48,483 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 138 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=82, Invalid=620, Unknown=0, NotChecked=0, Total=702 [2021-11-23 03:04:48,484 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 2 mSDsluCounter, 348 mSDsCounter, 0 mSdLazyCounter, 285 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 383 SdHoareTripleChecker+Invalid, 285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 285 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:04:48,484 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 383 Invalid, 285 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 285 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:04:48,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-23 03:04:48,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-11-23 03:04:48,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 32 states have (on average 1.03125) internal successors, (33), 32 states have internal predecessors, (33), 12 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-23 03:04:48,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 56 transitions. [2021-11-23 03:04:48,501 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 56 transitions. Word has length 75 [2021-11-23 03:04:48,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:04:48,501 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 56 transitions. [2021-11-23 03:04:48,502 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 11 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-23 03:04:48,502 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 56 transitions. [2021-11-23 03:04:48,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 03:04:48,503 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:04:48,503 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 10, 1, 1, 1, 1, 1] [2021-11-23 03:04:48,511 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 03:04:48,709 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-23 03:04:48,709 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:04:48,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:04:48,709 INFO L85 PathProgramCache]: Analyzing trace with hash -199243181, now seen corresponding path program 10 times [2021-11-23 03:04:48,709 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:04:48,709 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [876013269] [2021-11-23 03:04:48,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:04:48,710 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:04:48,715 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:04:48,716 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2069025151] [2021-11-23 03:04:48,716 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:04:48,716 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:04:48,716 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:04:48,720 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:04:48,733 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 03:04:49,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:04:49,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-23 03:04:49,757 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:04:50,094 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 22 proven. 165 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-11-23 03:04:50,094 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:04:50,261 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:04:50,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [876013269] [2021-11-23 03:04:50,262 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:04:50,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2069025151] [2021-11-23 03:04:50,262 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2069025151] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:04:50,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2041313289] [2021-11-23 03:04:50,264 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:04:50,264 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:04:50,264 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:04:50,265 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:04:50,265 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:04:50,829 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 92 for LOIs [2021-11-23 03:04:51,123 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:04:51,817 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3401#(and (exists ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_189| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_104| Int)) (and (or (and (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_189|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_104|) (= |#NULL.base| 0)) (and (= (select |#length| 3) 12) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= 9 (select |#length| 2)) (= (select |#valid| 1) 1) (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_104| 0) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (< 0 |#StackHeapBarrier|) (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_189| 0) (= |#NULL.base| 0))) (= |__VERIFIER_assert_#in~cond| (ite (= (* 4 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_104|) (+ (* 2 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_189| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_189| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_189|)) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_189| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_189|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_189| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_189| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_189| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_189|))) 1 0)))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0))' at error location [2021-11-23 03:04:51,817 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:04:51,817 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:04:51,817 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-11-23 03:04:51,817 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789369423] [2021-11-23 03:04:51,817 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:04:51,818 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 03:04:51,818 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:04:51,818 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 03:04:51,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=576, Unknown=0, NotChecked=0, Total=650 [2021-11-23 03:04:51,819 INFO L87 Difference]: Start difference. First operand 47 states and 56 transitions. Second operand has 16 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 12 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-23 03:04:52,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:04:52,092 INFO L93 Difference]: Finished difference Result 55 states and 65 transitions. [2021-11-23 03:04:52,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 03:04:52,092 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 12 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) Word has length 82 [2021-11-23 03:04:52,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:04:52,093 INFO L225 Difference]: With dead ends: 55 [2021-11-23 03:04:52,093 INFO L226 Difference]: Without dead ends: 50 [2021-11-23 03:04:52,094 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 151 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=85, Invalid=671, Unknown=0, NotChecked=0, Total=756 [2021-11-23 03:04:52,094 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 2 mSDsluCounter, 403 mSDsCounter, 0 mSdLazyCounter, 334 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 441 SdHoareTripleChecker+Invalid, 334 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 334 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:04:52,095 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 441 Invalid, 334 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 334 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:04:52,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-23 03:04:52,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-11-23 03:04:52,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 34 states have (on average 1.0294117647058822) internal successors, (35), 34 states have internal predecessors, (35), 13 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-23 03:04:52,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2021-11-23 03:04:52,103 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 82 [2021-11-23 03:04:52,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:04:52,104 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2021-11-23 03:04:52,104 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 12 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-23 03:04:52,104 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2021-11-23 03:04:52,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-23 03:04:52,106 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:04:52,106 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 11, 1, 1, 1, 1, 1] [2021-11-23 03:04:52,114 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 03:04:52,310 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:04:52,311 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:04:52,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:04:52,311 INFO L85 PathProgramCache]: Analyzing trace with hash 1788685375, now seen corresponding path program 11 times [2021-11-23 03:04:52,311 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:04:52,311 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [538455124] [2021-11-23 03:04:52,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:04:52,311 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:04:52,317 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:04:52,317 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1974833784] [2021-11-23 03:04:52,317 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:04:52,317 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:04:52,318 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:04:52,321 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:04:52,322 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 03:04:53,089 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-23 03:04:53,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:04:53,091 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-23 03:04:53,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:04:53,465 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 24 proven. 198 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2021-11-23 03:04:53,466 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:04:53,620 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:04:53,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [538455124] [2021-11-23 03:04:53,621 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:04:53,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1974833784] [2021-11-23 03:04:53,621 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1974833784] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:04:53,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [894424377] [2021-11-23 03:04:53,623 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:04:53,624 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:04:53,624 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:04:53,624 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:04:53,625 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:04:54,029 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2021-11-23 03:04:54,235 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:04:54,818 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3898#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:04:54,818 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:04:54,818 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:04:54,818 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2021-11-23 03:04:54,818 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2038445812] [2021-11-23 03:04:54,820 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:04:54,820 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-23 03:04:54,821 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:04:54,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-23 03:04:54,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=625, Unknown=0, NotChecked=0, Total=702 [2021-11-23 03:04:54,821 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 17 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 13 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-23 03:04:55,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:04:55,145 INFO L93 Difference]: Finished difference Result 58 states and 69 transitions. [2021-11-23 03:04:55,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 03:04:55,145 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 13 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Word has length 89 [2021-11-23 03:04:55,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:04:55,147 INFO L225 Difference]: With dead ends: 58 [2021-11-23 03:04:55,147 INFO L226 Difference]: Without dead ends: 53 [2021-11-23 03:04:55,147 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 164 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=88, Invalid=724, Unknown=0, NotChecked=0, Total=812 [2021-11-23 03:04:55,148 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 2 mSDsluCounter, 462 mSDsCounter, 0 mSdLazyCounter, 387 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 503 SdHoareTripleChecker+Invalid, 387 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 387 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:04:55,148 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 503 Invalid, 387 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 387 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 03:04:55,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-11-23 03:04:55,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-11-23 03:04:55,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 36 states have (on average 1.0277777777777777) internal successors, (37), 36 states have internal predecessors, (37), 14 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-11-23 03:04:55,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 64 transitions. [2021-11-23 03:04:55,157 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 64 transitions. Word has length 89 [2021-11-23 03:04:55,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:04:55,158 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 64 transitions. [2021-11-23 03:04:55,158 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 13 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-23 03:04:55,158 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 64 transitions. [2021-11-23 03:04:55,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-23 03:04:55,160 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:04:55,160 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 12, 1, 1, 1, 1, 1] [2021-11-23 03:04:55,166 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 03:04:55,365 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-23 03:04:55,366 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:04:55,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:04:55,366 INFO L85 PathProgramCache]: Analyzing trace with hash 857082067, now seen corresponding path program 12 times [2021-11-23 03:04:55,366 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:04:55,366 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [297184826] [2021-11-23 03:04:55,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:04:55,367 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:04:55,372 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:04:55,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [639656900] [2021-11-23 03:04:55,372 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:04:55,373 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:04:55,373 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:04:55,374 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:04:55,375 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 03:04:56,599 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:04:56,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:04:56,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-23 03:04:56,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:04:57,058 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 26 proven. 234 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2021-11-23 03:04:57,058 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:04:57,225 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:04:57,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [297184826] [2021-11-23 03:04:57,225 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:04:57,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [639656900] [2021-11-23 03:04:57,225 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [639656900] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:04:57,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [85356717] [2021-11-23 03:04:57,227 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:04:57,228 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:04:57,228 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:04:57,228 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:04:57,228 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:04:57,735 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 92 for LOIs [2021-11-23 03:04:57,996 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:04:58,563 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4427#(and (exists ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_238| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_124| Int)) (and (= (ite (= (+ (* 2 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_238| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_238| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_238|)) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_238| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_238| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_238| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_238|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_238| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_238|)) (* 4 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_124|)) 1 0) |__VERIFIER_assert_#in~cond|) (or (and (= (select |#length| 3) 12) (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_238| 0) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= 9 (select |#length| 2)) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_124| 0) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0)) (and (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_124|) (= |#NULL.offset| 0) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_238|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0))' at error location [2021-11-23 03:04:58,564 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:04:58,564 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:04:58,564 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2021-11-23 03:04:58,564 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [656560704] [2021-11-23 03:04:58,564 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:04:58,565 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 03:04:58,565 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:04:58,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 03:04:58,566 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=676, Unknown=0, NotChecked=0, Total=756 [2021-11-23 03:04:58,566 INFO L87 Difference]: Start difference. First operand 53 states and 64 transitions. Second operand has 18 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 14 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-11-23 03:04:58,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:04:58,986 INFO L93 Difference]: Finished difference Result 61 states and 73 transitions. [2021-11-23 03:04:58,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 03:04:58,986 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 14 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) Word has length 96 [2021-11-23 03:04:58,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:04:58,987 INFO L225 Difference]: With dead ends: 61 [2021-11-23 03:04:58,987 INFO L226 Difference]: Without dead ends: 56 [2021-11-23 03:04:58,988 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 177 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=91, Invalid=779, Unknown=0, NotChecked=0, Total=870 [2021-11-23 03:04:58,989 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 2 mSDsluCounter, 525 mSDsCounter, 0 mSdLazyCounter, 444 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 569 SdHoareTripleChecker+Invalid, 444 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 444 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:04:58,989 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 569 Invalid, 444 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 444 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:04:58,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-23 03:04:58,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-11-23 03:04:58,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 38 states have (on average 1.0263157894736843) internal successors, (39), 38 states have internal predecessors, (39), 15 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-11-23 03:04:58,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 68 transitions. [2021-11-23 03:04:58,998 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 68 transitions. Word has length 96 [2021-11-23 03:04:58,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:04:58,999 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 68 transitions. [2021-11-23 03:04:58,999 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 14 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-11-23 03:04:58,999 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 68 transitions. [2021-11-23 03:04:59,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-23 03:04:59,000 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:04:59,001 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 13, 1, 1, 1, 1, 1] [2021-11-23 03:04:59,007 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-23 03:04:59,206 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-23 03:04:59,206 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:04:59,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:04:59,207 INFO L85 PathProgramCache]: Analyzing trace with hash 73113023, now seen corresponding path program 13 times [2021-11-23 03:04:59,207 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:04:59,207 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2106163534] [2021-11-23 03:04:59,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:04:59,207 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:04:59,212 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:04:59,212 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [635404475] [2021-11-23 03:04:59,213 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:04:59,213 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:04:59,213 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:04:59,214 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:04:59,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 03:05:00,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:05:00,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-23 03:05:00,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:05:01,065 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 28 proven. 273 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2021-11-23 03:05:01,065 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:05:01,258 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:05:01,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2106163534] [2021-11-23 03:05:01,258 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:05:01,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [635404475] [2021-11-23 03:05:01,259 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [635404475] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:05:01,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [64947578] [2021-11-23 03:05:01,260 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:05:01,260 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:05:01,260 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:05:01,261 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:05:01,261 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:05:01,615 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2021-11-23 03:05:01,780 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:05:02,491 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4988#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:05:02,491 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:05:02,491 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:05:02,491 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2021-11-23 03:05:02,492 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [58608122] [2021-11-23 03:05:02,492 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:05:02,492 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-23 03:05:02,492 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:05:02,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-23 03:05:02,493 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=729, Unknown=0, NotChecked=0, Total=812 [2021-11-23 03:05:02,493 INFO L87 Difference]: Start difference. First operand 56 states and 68 transitions. Second operand has 19 states, 18 states have (on average 1.9444444444444444) internal successors, (35), 18 states have internal predecessors, (35), 15 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-11-23 03:05:02,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:05:02,847 INFO L93 Difference]: Finished difference Result 64 states and 77 transitions. [2021-11-23 03:05:02,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 03:05:02,847 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.9444444444444444) internal successors, (35), 18 states have internal predecessors, (35), 15 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) Word has length 103 [2021-11-23 03:05:02,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:05:02,848 INFO L225 Difference]: With dead ends: 64 [2021-11-23 03:05:02,848 INFO L226 Difference]: Without dead ends: 59 [2021-11-23 03:05:02,849 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 190 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=94, Invalid=836, Unknown=0, NotChecked=0, Total=930 [2021-11-23 03:05:02,849 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 2 mSDsluCounter, 592 mSDsCounter, 0 mSdLazyCounter, 505 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 639 SdHoareTripleChecker+Invalid, 505 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 505 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:05:02,850 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 639 Invalid, 505 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 505 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 03:05:02,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-23 03:05:02,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-11-23 03:05:02,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 40 states have (on average 1.025) internal successors, (41), 40 states have internal predecessors, (41), 16 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-23 03:05:02,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 72 transitions. [2021-11-23 03:05:02,859 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 72 transitions. Word has length 103 [2021-11-23 03:05:02,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:05:02,859 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 72 transitions. [2021-11-23 03:05:02,860 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 1.9444444444444444) internal successors, (35), 18 states have internal predecessors, (35), 15 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-11-23 03:05:02,860 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 72 transitions. [2021-11-23 03:05:02,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-11-23 03:05:02,861 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:05:02,861 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 14, 1, 1, 1, 1, 1] [2021-11-23 03:05:02,884 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-23 03:05:03,066 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-23 03:05:03,066 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:05:03,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:05:03,067 INFO L85 PathProgramCache]: Analyzing trace with hash 486336339, now seen corresponding path program 14 times [2021-11-23 03:05:03,067 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:05:03,067 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2074923503] [2021-11-23 03:05:03,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:05:03,067 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:05:03,072 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:05:03,072 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1701643362] [2021-11-23 03:05:03,072 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:05:03,072 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:05:03,072 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:05:03,073 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:05:03,074 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 03:05:03,641 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-11-23 03:05:03,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:05:03,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 64 conjunts are in the unsatisfiable core [2021-11-23 03:05:03,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:05:04,129 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 30 proven. 315 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2021-11-23 03:05:04,129 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:05:04,354 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:05:04,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2074923503] [2021-11-23 03:05:04,354 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:05:04,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1701643362] [2021-11-23 03:05:04,354 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1701643362] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:05:04,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [208660381] [2021-11-23 03:05:04,355 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:05:04,355 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:05:04,355 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:05:04,356 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:05:04,356 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:05:04,740 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2021-11-23 03:05:04,909 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:05:05,593 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5581#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_144| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_291| Int)) (and (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_291|) (or (and (= |#NULL.offset| 0) (= |#NULL.base| 0)) (and (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_144| 0) (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_291| 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))) (= (ite (= (* 4 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_144|) (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_291| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_291|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_291| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_291| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_291| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_291|) (* 2 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_291| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_291| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_291|)))) 1 0) |__VERIFIER_assert_#in~cond|) (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_144|))) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:05:05,593 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:05:05,593 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:05:05,593 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2021-11-23 03:05:05,593 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075271819] [2021-11-23 03:05:05,593 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:05:05,594 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 03:05:05,594 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:05:05,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 03:05:05,594 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=784, Unknown=0, NotChecked=0, Total=870 [2021-11-23 03:05:05,594 INFO L87 Difference]: Start difference. First operand 59 states and 72 transitions. Second operand has 20 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 16 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-23 03:05:06,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:05:06,048 INFO L93 Difference]: Finished difference Result 67 states and 81 transitions. [2021-11-23 03:05:06,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-23 03:05:06,048 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 16 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) Word has length 110 [2021-11-23 03:05:06,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:05:06,049 INFO L225 Difference]: With dead ends: 67 [2021-11-23 03:05:06,049 INFO L226 Difference]: Without dead ends: 62 [2021-11-23 03:05:06,050 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 203 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=97, Invalid=895, Unknown=0, NotChecked=0, Total=992 [2021-11-23 03:05:06,050 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 2 mSDsluCounter, 663 mSDsCounter, 0 mSdLazyCounter, 570 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 713 SdHoareTripleChecker+Invalid, 570 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 570 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:05:06,050 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 713 Invalid, 570 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 570 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:05:06,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-23 03:05:06,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2021-11-23 03:05:06,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 42 states have (on average 1.0238095238095237) internal successors, (43), 42 states have internal predecessors, (43), 17 states have call successors, (17), 3 states have call predecessors, (17), 2 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-11-23 03:05:06,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 76 transitions. [2021-11-23 03:05:06,059 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 76 transitions. Word has length 110 [2021-11-23 03:05:06,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:05:06,060 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 76 transitions. [2021-11-23 03:05:06,060 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 16 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-23 03:05:06,061 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 76 transitions. [2021-11-23 03:05:06,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-23 03:05:06,062 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:05:06,062 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 15, 1, 1, 1, 1, 1] [2021-11-23 03:05:06,075 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-23 03:05:06,268 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:05:06,268 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:05:06,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:05:06,269 INFO L85 PathProgramCache]: Analyzing trace with hash -2127204545, now seen corresponding path program 15 times [2021-11-23 03:05:06,269 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:05:06,269 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1951385870] [2021-11-23 03:05:06,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:05:06,269 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:05:06,274 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:05:06,276 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1700346841] [2021-11-23 03:05:06,276 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:05:06,276 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:05:06,277 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:05:06,277 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:05:06,278 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-23 03:05:07,628 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:05:07,628 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:05:07,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 68 conjunts are in the unsatisfiable core [2021-11-23 03:05:07,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:05:08,123 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 32 proven. 360 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2021-11-23 03:05:08,124 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:05:08,299 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:05:08,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1951385870] [2021-11-23 03:05:08,299 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:05:08,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1700346841] [2021-11-23 03:05:08,299 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1700346841] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:05:08,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [249731121] [2021-11-23 03:05:08,301 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:05:08,301 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:05:08,301 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:05:08,301 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:05:08,302 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:05:08,732 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2021-11-23 03:05:08,897 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:05:09,594 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6206#(and (exists ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_319| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_154| Int)) (and (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_154|) (= (ite (= (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_319| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_319|) (* 2 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_319| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_319| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_319|)) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_319| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_319| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_319| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_319|)) (* 4 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_154|)) 1 0) |__VERIFIER_assert_#in~cond|) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_319|) (or (and (= |#NULL.offset| 0) (= |#NULL.base| 0)) (and (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_154| 0) (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_319| 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:05:09,594 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:05:09,595 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:05:09,595 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2021-11-23 03:05:09,595 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1853587974] [2021-11-23 03:05:09,595 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:05:09,596 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-23 03:05:09,596 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:05:09,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-23 03:05:09,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=841, Unknown=0, NotChecked=0, Total=930 [2021-11-23 03:05:09,597 INFO L87 Difference]: Start difference. First operand 62 states and 76 transitions. Second operand has 21 states, 20 states have (on average 1.95) internal successors, (39), 20 states have internal predecessors, (39), 17 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-11-23 03:05:10,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:05:10,201 INFO L93 Difference]: Finished difference Result 70 states and 85 transitions. [2021-11-23 03:05:10,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-23 03:05:10,201 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.95) internal successors, (39), 20 states have internal predecessors, (39), 17 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) Word has length 117 [2021-11-23 03:05:10,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:05:10,203 INFO L225 Difference]: With dead ends: 70 [2021-11-23 03:05:10,203 INFO L226 Difference]: Without dead ends: 65 [2021-11-23 03:05:10,204 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 216 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=100, Invalid=956, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 03:05:10,204 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 2 mSDsluCounter, 738 mSDsCounter, 0 mSdLazyCounter, 639 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 791 SdHoareTripleChecker+Invalid, 639 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 639 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:05:10,205 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 791 Invalid, 639 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 639 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 03:05:10,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-11-23 03:05:10,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2021-11-23 03:05:10,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 44 states have (on average 1.0227272727272727) internal successors, (45), 44 states have internal predecessors, (45), 18 states have call successors, (18), 3 states have call predecessors, (18), 2 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-23 03:05:10,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 80 transitions. [2021-11-23 03:05:10,215 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 80 transitions. Word has length 117 [2021-11-23 03:05:10,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:05:10,216 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 80 transitions. [2021-11-23 03:05:10,216 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 1.95) internal successors, (39), 20 states have internal predecessors, (39), 17 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-11-23 03:05:10,216 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 80 transitions. [2021-11-23 03:05:10,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-23 03:05:10,217 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:05:10,218 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 16, 1, 1, 1, 1, 1] [2021-11-23 03:05:10,230 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-23 03:05:10,430 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-23 03:05:10,431 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:05:10,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:05:10,431 INFO L85 PathProgramCache]: Analyzing trace with hash -264477229, now seen corresponding path program 16 times [2021-11-23 03:05:10,432 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:05:10,432 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1726867880] [2021-11-23 03:05:10,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:05:10,432 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:05:10,443 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:05:10,450 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [337622984] [2021-11-23 03:05:10,451 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:05:10,451 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:05:10,451 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:05:10,452 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:05:10,468 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-23 03:05:11,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:05:11,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-23 03:05:11,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:05:11,765 INFO L134 CoverageAnalysis]: Checked inductivity of 986 backedges. 34 proven. 408 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2021-11-23 03:05:11,765 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:05:11,941 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:05:11,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1726867880] [2021-11-23 03:05:11,941 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:05:11,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [337622984] [2021-11-23 03:05:11,941 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [337622984] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:05:11,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [231292841] [2021-11-23 03:05:11,943 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:05:11,943 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:05:11,943 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:05:11,943 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:05:11,943 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:05:12,372 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2021-11-23 03:05:12,560 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:05:13,231 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6863#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:05:13,231 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:05:13,231 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:05:13,231 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2021-11-23 03:05:13,231 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2012917194] [2021-11-23 03:05:13,231 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:05:13,232 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 03:05:13,232 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:05:13,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 03:05:13,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=900, Unknown=0, NotChecked=0, Total=992 [2021-11-23 03:05:13,233 INFO L87 Difference]: Start difference. First operand 65 states and 80 transitions. Second operand has 22 states, 21 states have (on average 1.9523809523809523) internal successors, (41), 21 states have internal predecessors, (41), 18 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-23 03:05:13,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:05:13,717 INFO L93 Difference]: Finished difference Result 73 states and 89 transitions. [2021-11-23 03:05:13,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 03:05:13,718 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.9523809523809523) internal successors, (41), 21 states have internal predecessors, (41), 18 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) Word has length 124 [2021-11-23 03:05:13,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:05:13,719 INFO L225 Difference]: With dead ends: 73 [2021-11-23 03:05:13,719 INFO L226 Difference]: Without dead ends: 68 [2021-11-23 03:05:13,720 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 229 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=103, Invalid=1019, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 03:05:13,721 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 2 mSDsluCounter, 817 mSDsCounter, 0 mSdLazyCounter, 712 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 873 SdHoareTripleChecker+Invalid, 712 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 712 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:05:13,721 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 873 Invalid, 712 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 712 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:05:13,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-23 03:05:13,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-11-23 03:05:13,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 46 states have (on average 1.0217391304347827) internal successors, (47), 46 states have internal predecessors, (47), 19 states have call successors, (19), 3 states have call predecessors, (19), 2 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-23 03:05:13,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 84 transitions. [2021-11-23 03:05:13,729 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 84 transitions. Word has length 124 [2021-11-23 03:05:13,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:05:13,730 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 84 transitions. [2021-11-23 03:05:13,730 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 1.9523809523809523) internal successors, (41), 21 states have internal predecessors, (41), 18 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-23 03:05:13,730 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 84 transitions. [2021-11-23 03:05:13,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-11-23 03:05:13,731 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:05:13,731 INFO L514 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 17, 1, 1, 1, 1, 1] [2021-11-23 03:05:13,735 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-23 03:05:13,931 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-23 03:05:13,932 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:05:13,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:05:13,932 INFO L85 PathProgramCache]: Analyzing trace with hash 499294399, now seen corresponding path program 17 times [2021-11-23 03:05:13,932 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:05:13,932 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [109076979] [2021-11-23 03:05:13,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:05:13,932 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:05:13,937 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:05:13,937 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [6880506] [2021-11-23 03:05:13,938 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:05:13,938 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:05:13,938 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:05:13,939 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:05:13,948 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 03:05:15,513 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-11-23 03:05:15,514 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:05:15,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 342 conjuncts, 77 conjunts are in the unsatisfiable core [2021-11-23 03:05:15,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:05:16,202 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 36 proven. 459 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2021-11-23 03:05:16,202 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:05:17,860 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:05:17,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [109076979] [2021-11-23 03:05:17,860 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:05:17,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [6880506] [2021-11-23 03:05:17,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [6880506] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:05:17,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [180896358] [2021-11-23 03:05:17,862 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:05:17,862 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:05:17,862 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:05:17,862 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:05:17,862 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:05:18,319 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 92 for LOIs [2021-11-23 03:05:18,581 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:05:19,574 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7904#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_252| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_393| Int)) (and (or (and (<= |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_252| 1) (= |#NULL.offset| 0) (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_393| 1) (= |#NULL.base| 0)) (and (= |#NULL.offset| 0) (= |#NULL.base| 0))) (= (ite (= (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_393| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_393|) (* |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_252| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_393|)) 1 0) |__VERIFIER_assert_#in~cond|) (<= 0 (+ |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_252| 32768)) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_393|) (<= |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_252| 32767))) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:05:19,574 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:05:19,574 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:05:19,574 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2021-11-23 03:05:19,574 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818302297] [2021-11-23 03:05:19,575 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:05:19,575 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-23 03:05:19,575 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:05:19,576 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-23 03:05:19,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=416, Invalid=1936, Unknown=0, NotChecked=0, Total=2352 [2021-11-23 03:05:19,577 INFO L87 Difference]: Start difference. First operand 68 states and 84 transitions. Second operand has 23 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 22 states have internal predecessors, (43), 19 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-23 03:05:20,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:05:20,264 INFO L93 Difference]: Finished difference Result 76 states and 93 transitions. [2021-11-23 03:05:20,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-23 03:05:20,265 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 22 states have internal predecessors, (43), 19 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) Word has length 131 [2021-11-23 03:05:20,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:05:20,266 INFO L225 Difference]: With dead ends: 76 [2021-11-23 03:05:20,267 INFO L226 Difference]: Without dead ends: 71 [2021-11-23 03:05:20,268 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 338 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 185 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=427, Invalid=2123, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 03:05:20,268 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 2 mSDsluCounter, 900 mSDsCounter, 0 mSdLazyCounter, 789 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 959 SdHoareTripleChecker+Invalid, 789 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 789 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:05:20,269 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 959 Invalid, 789 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 789 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 03:05:20,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-23 03:05:20,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2021-11-23 03:05:20,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 48 states have (on average 1.0208333333333333) internal successors, (49), 48 states have internal predecessors, (49), 20 states have call successors, (20), 3 states have call predecessors, (20), 2 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-11-23 03:05:20,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 88 transitions. [2021-11-23 03:05:20,276 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 88 transitions. Word has length 131 [2021-11-23 03:05:20,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:05:20,277 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 88 transitions. [2021-11-23 03:05:20,277 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 22 states have internal predecessors, (43), 19 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-23 03:05:20,277 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 88 transitions. [2021-11-23 03:05:20,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-23 03:05:20,279 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:05:20,279 INFO L514 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 19, 19, 18, 1, 1, 1, 1, 1] [2021-11-23 03:05:20,287 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-23 03:05:20,482 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:05:20,483 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:05:20,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:05:20,483 INFO L85 PathProgramCache]: Analyzing trace with hash -1791196077, now seen corresponding path program 18 times [2021-11-23 03:05:20,483 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:05:20,483 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [756291418] [2021-11-23 03:05:20,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:05:20,483 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:05:20,488 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:05:20,488 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1219636843] [2021-11-23 03:05:20,489 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:05:20,489 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:05:20,489 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:05:20,490 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:05:20,491 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-23 03:05:21,898 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:05:21,898 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:05:21,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 80 conjunts are in the unsatisfiable core [2021-11-23 03:05:21,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:05:22,496 INFO L134 CoverageAnalysis]: Checked inductivity of 1235 backedges. 38 proven. 513 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2021-11-23 03:05:22,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:05:22,681 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:05:22,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [756291418] [2021-11-23 03:05:22,682 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:05:22,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1219636843] [2021-11-23 03:05:22,682 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1219636843] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:05:22,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [589106099] [2021-11-23 03:05:22,684 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:05:22,684 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:05:22,684 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:05:22,684 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:05:22,684 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:05:23,261 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 96 for LOIs [2021-11-23 03:05:24,067 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:05:24,980 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8625#(and (exists ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_424| Int) (|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_265| Int)) (and (<= 0 (+ |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_265| 32768)) (<= |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_265| 32767) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_424|) (= (ite (= (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_424| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_265|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_424| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_424|)) 1 0) |__VERIFIER_assert_#in~cond|) (or (and (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_424| 1) (<= |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_265| 1) (= |#NULL.offset| 0) (= |#NULL.base| 0)) (and (= |#NULL.offset| 0) (= |#NULL.base| 0))))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:05:24,980 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:05:24,980 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:05:24,981 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2021-11-23 03:05:24,981 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [727703391] [2021-11-23 03:05:24,981 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:05:24,986 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-23 03:05:24,986 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:05:24,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-23 03:05:24,987 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1024, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 03:05:24,987 INFO L87 Difference]: Start difference. First operand 71 states and 88 transitions. Second operand has 24 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 23 states have internal predecessors, (45), 20 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-11-23 03:05:25,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:05:25,653 INFO L93 Difference]: Finished difference Result 79 states and 97 transitions. [2021-11-23 03:05:25,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-23 03:05:25,654 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 23 states have internal predecessors, (45), 20 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) Word has length 138 [2021-11-23 03:05:25,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:05:25,655 INFO L225 Difference]: With dead ends: 79 [2021-11-23 03:05:25,656 INFO L226 Difference]: Without dead ends: 74 [2021-11-23 03:05:25,656 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 255 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=109, Invalid=1151, Unknown=0, NotChecked=0, Total=1260 [2021-11-23 03:05:25,657 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 2 mSDsluCounter, 987 mSDsCounter, 0 mSdLazyCounter, 870 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1049 SdHoareTripleChecker+Invalid, 870 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 870 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:05:25,657 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1049 Invalid, 870 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 870 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 03:05:25,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-11-23 03:05:25,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2021-11-23 03:05:25,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 50 states have (on average 1.02) internal successors, (51), 50 states have internal predecessors, (51), 21 states have call successors, (21), 3 states have call predecessors, (21), 2 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-23 03:05:25,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 92 transitions. [2021-11-23 03:05:25,670 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 92 transitions. Word has length 138 [2021-11-23 03:05:25,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:05:25,671 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 92 transitions. [2021-11-23 03:05:25,671 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 23 states have internal predecessors, (45), 20 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-11-23 03:05:25,671 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 92 transitions. [2021-11-23 03:05:25,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-23 03:05:25,672 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:05:25,673 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 20, 19, 1, 1, 1, 1, 1] [2021-11-23 03:05:25,679 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-23 03:05:25,879 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:05:25,879 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:05:25,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:05:25,880 INFO L85 PathProgramCache]: Analyzing trace with hash 748368447, now seen corresponding path program 19 times [2021-11-23 03:05:25,880 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:05:25,880 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [669572886] [2021-11-23 03:05:25,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:05:25,881 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:05:25,901 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:05:25,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1737860947] [2021-11-23 03:05:25,902 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:05:25,902 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:05:25,902 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:05:25,903 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:05:25,909 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-23 03:05:26,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:05:26,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 376 conjuncts, 84 conjunts are in the unsatisfiable core [2021-11-23 03:05:26,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:05:27,169 INFO L134 CoverageAnalysis]: Checked inductivity of 1370 backedges. 40 proven. 570 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2021-11-23 03:05:27,169 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:05:27,409 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:05:27,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [669572886] [2021-11-23 03:05:27,409 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:05:27,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1737860947] [2021-11-23 03:05:27,410 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1737860947] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:05:27,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [618131976] [2021-11-23 03:05:27,411 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:05:27,412 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:05:27,412 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:05:27,412 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:05:27,412 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:05:27,776 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2021-11-23 03:05:27,980 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:05:28,807 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9378#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_457| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_194| Int)) (and (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_194|) (or (and (= |#NULL.offset| 0) (= |#NULL.base| 0)) (and (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_457| 0) (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_194| 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_457|) (= (ite (= (* 4 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_194|) (+ (* 2 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_457| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_457| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_457|)) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_457| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_457| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_457| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_457|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_457| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_457|))) 1 0) |__VERIFIER_assert_#in~cond|))) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:05:28,807 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:05:28,807 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:05:28,807 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2021-11-23 03:05:28,807 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555500039] [2021-11-23 03:05:28,807 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:05:28,808 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-23 03:05:28,808 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:05:28,808 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-23 03:05:28,809 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1089, Unknown=0, NotChecked=0, Total=1190 [2021-11-23 03:05:28,809 INFO L87 Difference]: Start difference. First operand 74 states and 92 transitions. Second operand has 25 states, 24 states have (on average 1.9583333333333333) internal successors, (47), 24 states have internal predecessors, (47), 21 states have call successors, (21), 2 states have call predecessors, (21), 1 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-23 03:05:29,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:05:29,453 INFO L93 Difference]: Finished difference Result 82 states and 101 transitions. [2021-11-23 03:05:29,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 03:05:29,453 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.9583333333333333) internal successors, (47), 24 states have internal predecessors, (47), 21 states have call successors, (21), 2 states have call predecessors, (21), 1 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) Word has length 145 [2021-11-23 03:05:29,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:05:29,458 INFO L225 Difference]: With dead ends: 82 [2021-11-23 03:05:29,458 INFO L226 Difference]: Without dead ends: 77 [2021-11-23 03:05:29,459 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 268 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=112, Invalid=1220, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 03:05:29,460 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 2 mSDsluCounter, 1078 mSDsCounter, 0 mSdLazyCounter, 955 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1143 SdHoareTripleChecker+Invalid, 955 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 955 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:05:29,460 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1143 Invalid, 955 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 955 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 03:05:29,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-11-23 03:05:29,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2021-11-23 03:05:29,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 52 states have (on average 1.0192307692307692) internal successors, (53), 52 states have internal predecessors, (53), 22 states have call successors, (22), 3 states have call predecessors, (22), 2 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2021-11-23 03:05:29,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 96 transitions. [2021-11-23 03:05:29,469 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 96 transitions. Word has length 145 [2021-11-23 03:05:29,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:05:29,470 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 96 transitions. [2021-11-23 03:05:29,470 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 1.9583333333333333) internal successors, (47), 24 states have internal predecessors, (47), 21 states have call successors, (21), 2 states have call predecessors, (21), 1 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-23 03:05:29,470 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 96 transitions. [2021-11-23 03:05:29,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2021-11-23 03:05:29,471 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:05:29,472 INFO L514 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 21, 21, 20, 1, 1, 1, 1, 1] [2021-11-23 03:05:29,480 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2021-11-23 03:05:29,677 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-23 03:05:29,677 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:05:29,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:05:29,677 INFO L85 PathProgramCache]: Analyzing trace with hash 509952723, now seen corresponding path program 20 times [2021-11-23 03:05:29,677 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:05:29,677 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [206248904] [2021-11-23 03:05:29,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:05:29,678 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:05:29,683 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:05:29,684 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [17862395] [2021-11-23 03:05:29,684 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:05:29,684 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:05:29,684 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:05:29,693 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:05:29,694 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-23 03:05:30,485 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2021-11-23 03:05:30,486 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:05:30,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 393 conjuncts, 88 conjunts are in the unsatisfiable core [2021-11-23 03:05:30,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:05:31,147 INFO L134 CoverageAnalysis]: Checked inductivity of 1512 backedges. 42 proven. 630 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2021-11-23 03:05:31,147 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:05:31,377 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:05:31,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [206248904] [2021-11-23 03:05:31,377 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:05:31,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [17862395] [2021-11-23 03:05:31,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [17862395] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:05:31,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [120229271] [2021-11-23 03:05:31,379 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:05:31,379 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:05:31,380 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:05:31,380 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:05:31,380 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:05:31,752 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2021-11-23 03:05:31,915 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:05:32,674 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10163#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:05:32,674 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:05:32,674 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:05:32,675 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2021-11-23 03:05:32,675 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1196129736] [2021-11-23 03:05:32,675 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:05:32,675 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-23 03:05:32,675 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:05:32,676 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-23 03:05:32,676 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1156, Unknown=0, NotChecked=0, Total=1260 [2021-11-23 03:05:32,677 INFO L87 Difference]: Start difference. First operand 77 states and 96 transitions. Second operand has 26 states, 25 states have (on average 1.96) internal successors, (49), 25 states have internal predecessors, (49), 22 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2021-11-23 03:05:33,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:05:33,348 INFO L93 Difference]: Finished difference Result 85 states and 105 transitions. [2021-11-23 03:05:33,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 03:05:33,361 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.96) internal successors, (49), 25 states have internal predecessors, (49), 22 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) Word has length 152 [2021-11-23 03:05:33,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:05:33,363 INFO L225 Difference]: With dead ends: 85 [2021-11-23 03:05:33,363 INFO L226 Difference]: Without dead ends: 80 [2021-11-23 03:05:33,364 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 281 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=115, Invalid=1291, Unknown=0, NotChecked=0, Total=1406 [2021-11-23 03:05:33,365 INFO L933 BasicCegarLoop]: 70 mSDtfsCounter, 2 mSDsluCounter, 1173 mSDsCounter, 0 mSdLazyCounter, 1044 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1241 SdHoareTripleChecker+Invalid, 1044 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1044 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:05:33,365 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1241 Invalid, 1044 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1044 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 03:05:33,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-23 03:05:33,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2021-11-23 03:05:33,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 54 states have (on average 1.0185185185185186) internal successors, (55), 54 states have internal predecessors, (55), 23 states have call successors, (23), 3 states have call predecessors, (23), 2 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-11-23 03:05:33,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 100 transitions. [2021-11-23 03:05:33,376 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 100 transitions. Word has length 152 [2021-11-23 03:05:33,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:05:33,377 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 100 transitions. [2021-11-23 03:05:33,378 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 1.96) internal successors, (49), 25 states have internal predecessors, (49), 22 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2021-11-23 03:05:33,378 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 100 transitions. [2021-11-23 03:05:33,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-23 03:05:33,379 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:05:33,380 INFO L514 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 22, 21, 1, 1, 1, 1, 1] [2021-11-23 03:05:33,392 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-23 03:05:33,586 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-23 03:05:33,586 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:05:33,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:05:33,586 INFO L85 PathProgramCache]: Analyzing trace with hash -1772674113, now seen corresponding path program 21 times [2021-11-23 03:05:33,586 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:05:33,586 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2090679594] [2021-11-23 03:05:33,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:05:33,587 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:05:33,591 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:05:33,591 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2109768164] [2021-11-23 03:05:33,591 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:05:33,591 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:05:33,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:05:33,592 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:05:33,593 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-23 03:05:35,381 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:05:35,382 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:05:35,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 410 conjuncts, 92 conjunts are in the unsatisfiable core [2021-11-23 03:05:35,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:05:36,136 INFO L134 CoverageAnalysis]: Checked inductivity of 1661 backedges. 44 proven. 693 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2021-11-23 03:05:36,136 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:05:36,378 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:05:36,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2090679594] [2021-11-23 03:05:36,378 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:05:36,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2109768164] [2021-11-23 03:05:36,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2109768164] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:05:36,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [674574735] [2021-11-23 03:05:36,380 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:05:36,380 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:05:36,380 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:05:36,380 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:05:36,381 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:05:36,816 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 92 for LOIs [2021-11-23 03:05:37,096 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:05:40,061 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10980#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_524| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_214| Int)) (and (or (and (= (select |#length| 3) 12) (= 2 (select |#length| 1)) (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_524| 0) (= (select |#valid| 3) 1) (= 9 (select |#length| 2)) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_214| 0) (= (select (select |#memory_int| 1) 1) 0) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0)) (and (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_214|) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_524|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))) (= |__VERIFIER_assert_#in~cond| (ite (= (* 4 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_214|) (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_524| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_524| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_524| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_524|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_524| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_524|) (* 2 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_524| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_524| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_524|)))) 1 0)))))' at error location [2021-11-23 03:05:40,061 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:05:40,061 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:05:40,061 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2021-11-23 03:05:40,061 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2055453386] [2021-11-23 03:05:40,062 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:05:40,062 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-23 03:05:40,062 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:05:40,062 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-23 03:05:40,063 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1225, Unknown=1, NotChecked=0, Total=1332 [2021-11-23 03:05:40,063 INFO L87 Difference]: Start difference. First operand 80 states and 100 transitions. Second operand has 27 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 26 states have internal predecessors, (51), 23 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-11-23 03:05:41,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:05:41,065 INFO L93 Difference]: Finished difference Result 88 states and 109 transitions. [2021-11-23 03:05:41,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-23 03:05:41,066 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 26 states have internal predecessors, (51), 23 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) Word has length 159 [2021-11-23 03:05:41,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:05:41,068 INFO L225 Difference]: With dead ends: 88 [2021-11-23 03:05:41,068 INFO L226 Difference]: Without dead ends: 83 [2021-11-23 03:05:41,069 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 294 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=117, Invalid=1364, Unknown=1, NotChecked=0, Total=1482 [2021-11-23 03:05:41,069 INFO L933 BasicCegarLoop]: 73 mSDtfsCounter, 2 mSDsluCounter, 1272 mSDsCounter, 0 mSdLazyCounter, 1137 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1343 SdHoareTripleChecker+Invalid, 1137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 03:05:41,070 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1343 Invalid, 1137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1137 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 03:05:41,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-11-23 03:05:41,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-11-23 03:05:41,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 56 states have (on average 1.0178571428571428) internal successors, (57), 56 states have internal predecessors, (57), 24 states have call successors, (24), 3 states have call predecessors, (24), 2 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2021-11-23 03:05:41,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 104 transitions. [2021-11-23 03:05:41,081 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 104 transitions. Word has length 159 [2021-11-23 03:05:41,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:05:41,081 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 104 transitions. [2021-11-23 03:05:41,081 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 26 states have internal predecessors, (51), 23 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-11-23 03:05:41,082 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 104 transitions. [2021-11-23 03:05:41,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2021-11-23 03:05:41,085 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:05:41,085 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 23, 23, 22, 1, 1, 1, 1, 1] [2021-11-23 03:05:41,095 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-23 03:05:41,292 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:05:41,292 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:05:41,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:05:41,292 INFO L85 PathProgramCache]: Analyzing trace with hash 1209966931, now seen corresponding path program 22 times [2021-11-23 03:05:41,292 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:05:41,292 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1447161094] [2021-11-23 03:05:41,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:05:41,293 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:05:41,297 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:05:41,297 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [37723588] [2021-11-23 03:05:41,297 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:05:41,298 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:05:41,298 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:05:41,305 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:05:41,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-23 03:05:42,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:05:42,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 427 conjuncts, 96 conjunts are in the unsatisfiable core [2021-11-23 03:05:42,201 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:05:42,924 INFO L134 CoverageAnalysis]: Checked inductivity of 1817 backedges. 46 proven. 759 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2021-11-23 03:05:42,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:05:43,151 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:05:43,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1447161094] [2021-11-23 03:05:43,152 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:05:43,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [37723588] [2021-11-23 03:05:43,152 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [37723588] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:05:43,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [792510040] [2021-11-23 03:05:43,153 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:05:43,154 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:05:43,154 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:05:43,154 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:05:43,154 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:05:43,742 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 96 for LOIs [2021-11-23 03:05:44,525 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:05:45,319 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11829#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:05:45,319 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:05:45,319 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:05:45,319 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2021-11-23 03:05:45,320 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555117942] [2021-11-23 03:05:45,320 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:05:45,320 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-23 03:05:45,320 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:05:45,321 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-23 03:05:45,321 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1296, Unknown=0, NotChecked=0, Total=1406 [2021-11-23 03:05:45,321 INFO L87 Difference]: Start difference. First operand 83 states and 104 transitions. Second operand has 28 states, 27 states have (on average 1.962962962962963) internal successors, (53), 27 states have internal predecessors, (53), 24 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2021-11-23 03:05:46,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:05:46,134 INFO L93 Difference]: Finished difference Result 91 states and 113 transitions. [2021-11-23 03:05:46,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 03:05:46,134 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 1.962962962962963) internal successors, (53), 27 states have internal predecessors, (53), 24 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) Word has length 166 [2021-11-23 03:05:46,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:05:46,135 INFO L225 Difference]: With dead ends: 91 [2021-11-23 03:05:46,135 INFO L226 Difference]: Without dead ends: 86 [2021-11-23 03:05:46,136 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 307 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=121, Invalid=1439, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 03:05:46,136 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 2 mSDsluCounter, 1375 mSDsCounter, 0 mSdLazyCounter, 1234 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1449 SdHoareTripleChecker+Invalid, 1234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1234 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 03:05:46,137 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1449 Invalid, 1234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1234 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 03:05:46,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-11-23 03:05:46,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2021-11-23 03:05:46,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 58 states have (on average 1.0172413793103448) internal successors, (59), 58 states have internal predecessors, (59), 25 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-11-23 03:05:46,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 108 transitions. [2021-11-23 03:05:46,147 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 108 transitions. Word has length 166 [2021-11-23 03:05:46,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:05:46,148 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 108 transitions. [2021-11-23 03:05:46,148 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 1.962962962962963) internal successors, (53), 27 states have internal predecessors, (53), 24 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2021-11-23 03:05:46,148 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 108 transitions. [2021-11-23 03:05:46,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2021-11-23 03:05:46,150 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:05:46,150 INFO L514 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 24, 23, 1, 1, 1, 1, 1] [2021-11-23 03:05:46,165 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-23 03:05:46,355 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-23 03:05:46,355 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:05:46,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:05:46,356 INFO L85 PathProgramCache]: Analyzing trace with hash 1502508351, now seen corresponding path program 23 times [2021-11-23 03:05:46,356 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:05:46,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1180087407] [2021-11-23 03:05:46,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:05:46,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:05:46,364 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:05:46,364 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [701983724] [2021-11-23 03:05:46,364 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:05:46,365 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:05:46,365 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:05:46,366 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:05:46,386 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-23 03:05:49,634 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2021-11-23 03:05:49,634 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:05:49,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 444 conjuncts, 100 conjunts are in the unsatisfiable core [2021-11-23 03:05:49,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:05:50,460 INFO L134 CoverageAnalysis]: Checked inductivity of 1980 backedges. 48 proven. 828 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2021-11-23 03:05:50,460 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:05:50,702 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:05:50,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1180087407] [2021-11-23 03:05:50,702 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:05:50,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [701983724] [2021-11-23 03:05:50,703 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [701983724] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:05:50,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [581954339] [2021-11-23 03:05:50,704 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:05:50,704 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:05:50,704 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:05:50,704 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:05:50,704 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:05:51,078 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2021-11-23 03:05:51,289 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:05:52,226 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12710#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:05:52,227 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:05:52,227 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:05:52,227 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2021-11-23 03:05:52,227 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49456734] [2021-11-23 03:05:52,227 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:05:52,228 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-23 03:05:52,228 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:05:52,228 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-23 03:05:52,229 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1369, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 03:05:52,229 INFO L87 Difference]: Start difference. First operand 86 states and 108 transitions. Second operand has 29 states, 28 states have (on average 1.9642857142857142) internal successors, (55), 28 states have internal predecessors, (55), 25 states have call successors, (25), 2 states have call predecessors, (25), 1 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-11-23 03:05:53,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:05:53,177 INFO L93 Difference]: Finished difference Result 94 states and 117 transitions. [2021-11-23 03:05:53,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-23 03:05:53,178 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 1.9642857142857142) internal successors, (55), 28 states have internal predecessors, (55), 25 states have call successors, (25), 2 states have call predecessors, (25), 1 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) Word has length 173 [2021-11-23 03:05:53,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:05:53,179 INFO L225 Difference]: With dead ends: 94 [2021-11-23 03:05:53,179 INFO L226 Difference]: Without dead ends: 89 [2021-11-23 03:05:53,180 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 320 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=124, Invalid=1516, Unknown=0, NotChecked=0, Total=1640 [2021-11-23 03:05:53,180 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 2 mSDsluCounter, 1482 mSDsCounter, 0 mSdLazyCounter, 1335 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1559 SdHoareTripleChecker+Invalid, 1335 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1335 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 03:05:53,180 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1559 Invalid, 1335 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1335 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 03:05:53,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-11-23 03:05:53,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2021-11-23 03:05:53,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 60 states have (on average 1.0166666666666666) internal successors, (61), 60 states have internal predecessors, (61), 26 states have call successors, (26), 3 states have call predecessors, (26), 2 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) [2021-11-23 03:05:53,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 112 transitions. [2021-11-23 03:05:53,191 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 112 transitions. Word has length 173 [2021-11-23 03:05:53,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:05:53,192 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 112 transitions. [2021-11-23 03:05:53,192 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 1.9642857142857142) internal successors, (55), 28 states have internal predecessors, (55), 25 states have call successors, (25), 2 states have call predecessors, (25), 1 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-11-23 03:05:53,192 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 112 transitions. [2021-11-23 03:05:53,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2021-11-23 03:05:53,194 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:05:53,194 INFO L514 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 25, 25, 24, 1, 1, 1, 1, 1] [2021-11-23 03:05:53,202 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-23 03:05:53,401 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-23 03:05:53,402 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:05:53,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:05:53,402 INFO L85 PathProgramCache]: Analyzing trace with hash -120545325, now seen corresponding path program 24 times [2021-11-23 03:05:53,402 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:05:53,402 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2099022436] [2021-11-23 03:05:53,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:05:53,402 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:05:53,407 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:05:53,407 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [34198252] [2021-11-23 03:05:53,407 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:05:53,408 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:05:53,408 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:05:53,409 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:05:53,413 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-23 03:05:55,513 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:05:55,513 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:05:55,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 461 conjuncts, 104 conjunts are in the unsatisfiable core [2021-11-23 03:05:55,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:05:56,549 INFO L134 CoverageAnalysis]: Checked inductivity of 2150 backedges. 50 proven. 900 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2021-11-23 03:05:56,549 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:05:56,802 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:05:56,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2099022436] [2021-11-23 03:05:56,802 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:05:56,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [34198252] [2021-11-23 03:05:56,802 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [34198252] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:05:56,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [683394008] [2021-11-23 03:05:56,803 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:05:56,804 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:05:56,804 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:05:56,804 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:05:56,804 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:05:57,448 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 96 for LOIs [2021-11-23 03:05:58,300 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:05:59,355 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13623#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_244| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_632| Int)) (and (or (and (<= 0 |#NULL.base|) (<= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_244| 0) (<= |#NULL.offset| 0) (<= |#NULL.base| 0) (<= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_632| 0) (or (and (= |#NULL.offset| 0) (= |#NULL.base| 0)) (and (= (select |#length| 3) 12) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= 9 (select |#length| 2)) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_244| 0) (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_632| 0) (= (select (select |#memory_int| 1) 1) 0) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0))) (<= 0 |#NULL.offset|) (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_244|) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_632|) (<= 0 |#StackHeapBarrier|)) (and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (<= |#NULL.base| 0) (or (and (= |#NULL.offset| 0) (= |#NULL.base| 0)) (and (= (select |#length| 3) 12) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= 9 (select |#length| 2)) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_244| 0) (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_632| 0) (= (select (select |#memory_int| 1) 1) 0) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0))) (<= 0 |#NULL.offset|) (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_244|) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_632|) (<= 0 |#StackHeapBarrier|))) (= |__VERIFIER_assert_#in~cond| (ite (= (+ (* 2 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_632| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_632| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_632|)) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_632| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_632|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_632| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_632| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_632| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_632|)) (* 4 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_244|)) 1 0)))))' at error location [2021-11-23 03:05:59,355 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:05:59,355 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:05:59,355 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2021-11-23 03:05:59,355 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [11433254] [2021-11-23 03:05:59,356 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:05:59,356 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-23 03:05:59,356 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:05:59,356 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-23 03:05:59,357 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1444, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 03:05:59,357 INFO L87 Difference]: Start difference. First operand 89 states and 112 transitions. Second operand has 30 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 29 states have internal predecessors, (57), 26 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) [2021-11-23 03:06:00,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:06:00,461 INFO L93 Difference]: Finished difference Result 97 states and 121 transitions. [2021-11-23 03:06:00,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 03:06:00,462 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 29 states have internal predecessors, (57), 26 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) Word has length 180 [2021-11-23 03:06:00,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:06:00,463 INFO L225 Difference]: With dead ends: 97 [2021-11-23 03:06:00,463 INFO L226 Difference]: Without dead ends: 92 [2021-11-23 03:06:00,464 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 374 GetRequests, 333 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=127, Invalid=1595, Unknown=0, NotChecked=0, Total=1722 [2021-11-23 03:06:00,465 INFO L933 BasicCegarLoop]: 82 mSDtfsCounter, 2 mSDsluCounter, 1593 mSDsCounter, 0 mSdLazyCounter, 1440 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1673 SdHoareTripleChecker+Invalid, 1440 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:06:00,466 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1673 Invalid, 1440 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1440 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-23 03:06:00,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-23 03:06:00,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2021-11-23 03:06:00,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 62 states have (on average 1.0161290322580645) internal successors, (63), 62 states have internal predecessors, (63), 27 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) [2021-11-23 03:06:00,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 116 transitions. [2021-11-23 03:06:00,478 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 116 transitions. Word has length 180 [2021-11-23 03:06:00,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:06:00,479 INFO L470 AbstractCegarLoop]: Abstraction has 92 states and 116 transitions. [2021-11-23 03:06:00,479 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 29 states have internal predecessors, (57), 26 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) [2021-11-23 03:06:00,479 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 116 transitions. [2021-11-23 03:06:00,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2021-11-23 03:06:00,481 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:06:00,481 INFO L514 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 26, 26, 25, 1, 1, 1, 1, 1] [2021-11-23 03:06:00,489 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-23 03:06:00,688 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-23 03:06:00,688 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:06:00,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:06:00,689 INFO L85 PathProgramCache]: Analyzing trace with hash 182003391, now seen corresponding path program 25 times [2021-11-23 03:06:00,689 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:06:00,689 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1286753017] [2021-11-23 03:06:00,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:06:00,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:06:00,694 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:06:00,694 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [39454660] [2021-11-23 03:06:00,694 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:06:00,694 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:06:00,695 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:06:00,695 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:06:00,696 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-23 03:06:01,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:06:01,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 478 conjuncts, 108 conjunts are in the unsatisfiable core [2021-11-23 03:06:01,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:06:02,704 INFO L134 CoverageAnalysis]: Checked inductivity of 2327 backedges. 52 proven. 975 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2021-11-23 03:06:02,704 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:06:02,931 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:06:02,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1286753017] [2021-11-23 03:06:02,932 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:06:02,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [39454660] [2021-11-23 03:06:02,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [39454660] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:06:02,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [631128140] [2021-11-23 03:06:02,933 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:06:02,933 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:06:02,933 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:06:02,933 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:06:02,934 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:06:03,445 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 92 for LOIs [2021-11-23 03:06:03,696 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:06:04,619 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14568#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:06:04,619 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:06:04,619 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:06:04,619 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2021-11-23 03:06:04,620 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749983461] [2021-11-23 03:06:04,620 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:06:04,621 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-23 03:06:04,622 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:06:04,622 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-23 03:06:04,622 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1521, Unknown=0, NotChecked=0, Total=1640 [2021-11-23 03:06:04,623 INFO L87 Difference]: Start difference. First operand 92 states and 116 transitions. Second operand has 31 states, 30 states have (on average 1.9666666666666666) internal successors, (59), 30 states have internal predecessors, (59), 27 states have call successors, (27), 2 states have call predecessors, (27), 1 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) [2021-11-23 03:06:05,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:06:05,564 INFO L93 Difference]: Finished difference Result 100 states and 125 transitions. [2021-11-23 03:06:05,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 03:06:05,570 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 1.9666666666666666) internal successors, (59), 30 states have internal predecessors, (59), 27 states have call successors, (27), 2 states have call predecessors, (27), 1 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) Word has length 187 [2021-11-23 03:06:05,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:06:05,571 INFO L225 Difference]: With dead ends: 100 [2021-11-23 03:06:05,571 INFO L226 Difference]: Without dead ends: 95 [2021-11-23 03:06:05,572 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 346 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=130, Invalid=1676, Unknown=0, NotChecked=0, Total=1806 [2021-11-23 03:06:05,573 INFO L933 BasicCegarLoop]: 85 mSDtfsCounter, 2 mSDsluCounter, 1708 mSDsCounter, 0 mSdLazyCounter, 1549 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1791 SdHoareTripleChecker+Invalid, 1549 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1549 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 03:06:05,573 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1791 Invalid, 1549 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1549 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 03:06:05,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-11-23 03:06:05,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2021-11-23 03:06:05,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 64 states have (on average 1.015625) internal successors, (65), 64 states have internal predecessors, (65), 28 states have call successors, (28), 3 states have call predecessors, (28), 2 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) [2021-11-23 03:06:05,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 120 transitions. [2021-11-23 03:06:05,585 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 120 transitions. Word has length 187 [2021-11-23 03:06:05,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:06:05,585 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 120 transitions. [2021-11-23 03:06:05,586 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 1.9666666666666666) internal successors, (59), 30 states have internal predecessors, (59), 27 states have call successors, (27), 2 states have call predecessors, (27), 1 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) [2021-11-23 03:06:05,586 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 120 transitions. [2021-11-23 03:06:05,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2021-11-23 03:06:05,587 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:06:05,587 INFO L514 BasicCegarLoop]: trace histogram [28, 27, 27, 27, 27, 27, 26, 1, 1, 1, 1, 1] [2021-11-23 03:06:05,593 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-23 03:06:05,793 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:06:05,793 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:06:05,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:06:05,794 INFO L85 PathProgramCache]: Analyzing trace with hash -1058849197, now seen corresponding path program 26 times [2021-11-23 03:06:05,794 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:06:05,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [98597535] [2021-11-23 03:06:05,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:06:05,794 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:06:05,802 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:06:05,802 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [443900406] [2021-11-23 03:06:05,802 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:06:05,802 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:06:05,802 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:06:05,803 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:06:05,805 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-23 03:06:08,691 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2021-11-23 03:06:08,691 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:06:08,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 495 conjuncts, 112 conjunts are in the unsatisfiable core [2021-11-23 03:06:08,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:06:09,644 INFO L134 CoverageAnalysis]: Checked inductivity of 2511 backedges. 54 proven. 1053 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2021-11-23 03:06:09,644 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:06:09,912 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:06:09,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [98597535] [2021-11-23 03:06:09,913 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:06:09,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [443900406] [2021-11-23 03:06:09,913 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [443900406] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:06:09,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [919591276] [2021-11-23 03:06:09,914 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:06:09,914 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:06:09,915 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:06:09,915 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:06:09,915 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:06:10,384 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2021-11-23 03:06:10,582 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:06:11,407 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15545#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:06:11,407 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:06:11,407 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:06:11,407 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2021-11-23 03:06:11,407 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2055484189] [2021-11-23 03:06:11,408 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:06:11,408 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 03:06:11,408 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:06:11,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 03:06:11,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1600, Unknown=0, NotChecked=0, Total=1722 [2021-11-23 03:06:11,409 INFO L87 Difference]: Start difference. First operand 95 states and 120 transitions. Second operand has 32 states, 31 states have (on average 1.967741935483871) internal successors, (61), 31 states have internal predecessors, (61), 28 states have call successors, (28), 2 states have call predecessors, (28), 1 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) [2021-11-23 03:06:12,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:06:12,398 INFO L93 Difference]: Finished difference Result 103 states and 129 transitions. [2021-11-23 03:06:12,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-23 03:06:12,398 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 1.967741935483871) internal successors, (61), 31 states have internal predecessors, (61), 28 states have call successors, (28), 2 states have call predecessors, (28), 1 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) Word has length 194 [2021-11-23 03:06:12,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:06:12,399 INFO L225 Difference]: With dead ends: 103 [2021-11-23 03:06:12,400 INFO L226 Difference]: Without dead ends: 98 [2021-11-23 03:06:12,401 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 359 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=133, Invalid=1759, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 03:06:12,401 INFO L933 BasicCegarLoop]: 88 mSDtfsCounter, 2 mSDsluCounter, 1827 mSDsCounter, 0 mSdLazyCounter, 1662 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1913 SdHoareTripleChecker+Invalid, 1662 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1662 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 03:06:12,402 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 1913 Invalid, 1662 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1662 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 03:06:12,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-11-23 03:06:12,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2021-11-23 03:06:12,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 66 states have (on average 1.0151515151515151) internal successors, (67), 66 states have internal predecessors, (67), 29 states have call successors, (29), 3 states have call predecessors, (29), 2 states have return successors, (28), 28 states have call predecessors, (28), 28 states have call successors, (28) [2021-11-23 03:06:12,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 124 transitions. [2021-11-23 03:06:12,414 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 124 transitions. Word has length 194 [2021-11-23 03:06:12,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:06:12,415 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 124 transitions. [2021-11-23 03:06:12,415 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 1.967741935483871) internal successors, (61), 31 states have internal predecessors, (61), 28 states have call successors, (28), 2 states have call predecessors, (28), 1 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) [2021-11-23 03:06:12,416 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 124 transitions. [2021-11-23 03:06:12,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2021-11-23 03:06:12,417 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:06:12,418 INFO L514 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 28, 28, 27, 1, 1, 1, 1, 1] [2021-11-23 03:06:12,426 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2021-11-23 03:06:12,626 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-23 03:06:12,626 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:06:12,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:06:12,627 INFO L85 PathProgramCache]: Analyzing trace with hash 1422866495, now seen corresponding path program 27 times [2021-11-23 03:06:12,627 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:06:12,627 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [35854683] [2021-11-23 03:06:12,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:06:12,628 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:06:12,634 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:06:12,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1918265914] [2021-11-23 03:06:12,634 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:06:12,635 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:06:12,635 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:06:12,636 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:06:12,643 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-23 03:06:14,915 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:06:14,915 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:06:14,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 512 conjuncts, 116 conjunts are in the unsatisfiable core [2021-11-23 03:06:14,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:06:15,859 INFO L134 CoverageAnalysis]: Checked inductivity of 2702 backedges. 56 proven. 1134 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2021-11-23 03:06:15,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:06:16,109 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:06:16,109 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [35854683] [2021-11-23 03:06:16,109 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:06:16,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1918265914] [2021-11-23 03:06:16,110 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1918265914] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:06:16,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [945674552] [2021-11-23 03:06:16,111 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:06:16,111 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:06:16,112 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:06:16,112 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:06:16,112 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:06:16,706 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 96 for LOIs [2021-11-23 03:06:17,471 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:06:18,620 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16554#(and (exists ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_749| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_274| Int)) (and (= |__VERIFIER_assert_#in~cond| (ite (= (* 4 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_274|) (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_749| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_749| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_749| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_749|) (* 2 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_749| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_749| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_749|)) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_749| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_749|))) 1 0)) (or (and (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_749|) (<= 0 |#NULL.base|) (<= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_274| 0) (or (and (= |#NULL.offset| 0) (= |#NULL.base| 0)) (and (= (select |#length| 3) 12) (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_274| 0) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= 9 (select |#length| 2)) (= (select |#valid| 1) 1) (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_749| 0) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0))) (<= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_749| 0) (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_274|) (<= |#NULL.offset| 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|)) (and (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_749|) (<= 0 |#NULL.base|) (or (and (= |#NULL.offset| 0) (= |#NULL.base| 0)) (and (= (select |#length| 3) 12) (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_274| 0) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= 9 (select |#length| 2)) (= (select |#valid| 1) 1) (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_749| 0) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0))) (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_274|) (<= |#NULL.offset| 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0))' at error location [2021-11-23 03:06:18,620 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:06:18,620 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:06:18,620 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2021-11-23 03:06:18,620 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106116228] [2021-11-23 03:06:18,621 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:06:18,621 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-23 03:06:18,621 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:06:18,621 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-23 03:06:18,622 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1681, Unknown=0, NotChecked=0, Total=1806 [2021-11-23 03:06:18,622 INFO L87 Difference]: Start difference. First operand 98 states and 124 transitions. Second operand has 33 states, 32 states have (on average 1.96875) internal successors, (63), 32 states have internal predecessors, (63), 29 states have call successors, (29), 2 states have call predecessors, (29), 1 states have return successors, (28), 28 states have call predecessors, (28), 28 states have call successors, (28) [2021-11-23 03:06:19,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:06:19,698 INFO L93 Difference]: Finished difference Result 106 states and 133 transitions. [2021-11-23 03:06:19,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-23 03:06:19,699 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 1.96875) internal successors, (63), 32 states have internal predecessors, (63), 29 states have call successors, (29), 2 states have call predecessors, (29), 1 states have return successors, (28), 28 states have call predecessors, (28), 28 states have call successors, (28) Word has length 201 [2021-11-23 03:06:19,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:06:19,700 INFO L225 Difference]: With dead ends: 106 [2021-11-23 03:06:19,700 INFO L226 Difference]: Without dead ends: 101 [2021-11-23 03:06:19,701 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 416 GetRequests, 372 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=136, Invalid=1844, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 03:06:19,701 INFO L933 BasicCegarLoop]: 91 mSDtfsCounter, 2 mSDsluCounter, 1950 mSDsCounter, 0 mSdLazyCounter, 1779 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 2039 SdHoareTripleChecker+Invalid, 1779 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1779 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:06:19,702 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 2039 Invalid, 1779 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1779 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-23 03:06:19,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-11-23 03:06:19,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2021-11-23 03:06:19,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 68 states have (on average 1.0147058823529411) internal successors, (69), 68 states have internal predecessors, (69), 30 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (29), 29 states have call predecessors, (29), 29 states have call successors, (29) [2021-11-23 03:06:19,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 128 transitions. [2021-11-23 03:06:19,713 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 128 transitions. Word has length 201 [2021-11-23 03:06:19,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:06:19,714 INFO L470 AbstractCegarLoop]: Abstraction has 101 states and 128 transitions. [2021-11-23 03:06:19,714 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 1.96875) internal successors, (63), 32 states have internal predecessors, (63), 29 states have call successors, (29), 2 states have call predecessors, (29), 1 states have return successors, (28), 28 states have call predecessors, (28), 28 states have call successors, (28) [2021-11-23 03:06:19,714 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 128 transitions. [2021-11-23 03:06:19,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2021-11-23 03:06:19,716 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:06:19,716 INFO L514 BasicCegarLoop]: trace histogram [30, 29, 29, 29, 29, 29, 28, 1, 1, 1, 1, 1] [2021-11-23 03:06:19,738 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2021-11-23 03:06:19,924 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-23 03:06:19,924 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:06:19,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:06:19,924 INFO L85 PathProgramCache]: Analyzing trace with hash 1522433235, now seen corresponding path program 28 times [2021-11-23 03:06:19,924 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:06:19,924 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1197643089] [2021-11-23 03:06:19,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:06:19,925 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:06:19,929 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:06:19,929 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [576851199] [2021-11-23 03:06:19,929 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:06:19,929 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:06:19,930 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:06:19,930 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:06:19,932 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-23 03:06:20,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:06:20,961 INFO L263 TraceCheckSpWp]: Trace formula consists of 529 conjuncts, 120 conjunts are in the unsatisfiable core [2021-11-23 03:06:20,964 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:06:22,060 INFO L134 CoverageAnalysis]: Checked inductivity of 2900 backedges. 58 proven. 1218 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2021-11-23 03:06:22,061 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:06:22,337 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:06:22,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1197643089] [2021-11-23 03:06:22,337 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:06:22,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [576851199] [2021-11-23 03:06:22,338 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [576851199] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:06:22,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1040627608] [2021-11-23 03:06:22,339 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:06:22,339 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:06:22,339 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:06:22,340 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:06:22,340 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:06:22,695 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2021-11-23 03:06:22,870 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:06:23,752 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17595#(and (exists ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_790| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_284| Int)) (and (or (and (= |#NULL.offset| 0) (= |#NULL.base| 0)) (and (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_284| 0) (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_790| 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))) (= (ite (= (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_790| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_790| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_790| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_790|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_790| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_790|) (* 2 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_790| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_790| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_790|))) (* 4 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_284|)) 1 0) |__VERIFIER_assert_#in~cond|) (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_284|) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_790|))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:06:23,752 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:06:23,753 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:06:23,753 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2021-11-23 03:06:23,753 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000588813] [2021-11-23 03:06:23,753 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:06:23,753 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 03:06:23,753 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:06:23,754 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 03:06:23,754 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1764, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 03:06:23,754 INFO L87 Difference]: Start difference. First operand 101 states and 128 transitions. Second operand has 34 states, 33 states have (on average 1.9696969696969697) internal successors, (65), 33 states have internal predecessors, (65), 30 states have call successors, (30), 2 states have call predecessors, (30), 1 states have return successors, (29), 29 states have call predecessors, (29), 29 states have call successors, (29) [2021-11-23 03:06:24,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:06:24,920 INFO L93 Difference]: Finished difference Result 109 states and 137 transitions. [2021-11-23 03:06:24,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-23 03:06:24,920 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 1.9696969696969697) internal successors, (65), 33 states have internal predecessors, (65), 30 states have call successors, (30), 2 states have call predecessors, (30), 1 states have return successors, (29), 29 states have call predecessors, (29), 29 states have call successors, (29) Word has length 208 [2021-11-23 03:06:24,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:06:24,921 INFO L225 Difference]: With dead ends: 109 [2021-11-23 03:06:24,921 INFO L226 Difference]: Without dead ends: 104 [2021-11-23 03:06:24,922 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 385 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=139, Invalid=1931, Unknown=0, NotChecked=0, Total=2070 [2021-11-23 03:06:24,923 INFO L933 BasicCegarLoop]: 94 mSDtfsCounter, 2 mSDsluCounter, 2077 mSDsCounter, 0 mSdLazyCounter, 1900 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 2169 SdHoareTripleChecker+Invalid, 1900 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1900 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:06:24,923 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 2169 Invalid, 1900 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1900 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-23 03:06:24,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-11-23 03:06:24,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 104. [2021-11-23 03:06:24,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 70 states have (on average 1.0142857142857142) internal successors, (71), 70 states have internal predecessors, (71), 31 states have call successors, (31), 3 states have call predecessors, (31), 2 states have return successors, (30), 30 states have call predecessors, (30), 30 states have call successors, (30) [2021-11-23 03:06:24,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 132 transitions. [2021-11-23 03:06:24,936 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 132 transitions. Word has length 208 [2021-11-23 03:06:24,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:06:24,936 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 132 transitions. [2021-11-23 03:06:24,937 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 33 states have (on average 1.9696969696969697) internal successors, (65), 33 states have internal predecessors, (65), 30 states have call successors, (30), 2 states have call predecessors, (30), 1 states have return successors, (29), 29 states have call predecessors, (29), 29 states have call successors, (29) [2021-11-23 03:06:24,937 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 132 transitions. [2021-11-23 03:06:24,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2021-11-23 03:06:24,938 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:06:24,939 INFO L514 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 30, 29, 1, 1, 1, 1, 1] [2021-11-23 03:06:24,946 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-23 03:06:25,145 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:06:25,145 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:06:25,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:06:25,145 INFO L85 PathProgramCache]: Analyzing trace with hash 2013833663, now seen corresponding path program 29 times [2021-11-23 03:06:25,146 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:06:25,146 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1011181902] [2021-11-23 03:06:25,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:06:25,146 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:06:25,152 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:06:25,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [496570639] [2021-11-23 03:06:25,153 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:06:25,153 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:06:25,154 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:06:25,154 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:06:25,156 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-23 03:06:31,281 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2021-11-23 03:06:31,281 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:06:31,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 546 conjuncts, 125 conjunts are in the unsatisfiable core [2021-11-23 03:06:31,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:06:32,559 INFO L134 CoverageAnalysis]: Checked inductivity of 3105 backedges. 60 proven. 1305 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2021-11-23 03:06:32,559 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:06:36,454 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:06:36,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1011181902] [2021-11-23 03:06:36,455 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:06:36,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [496570639] [2021-11-23 03:06:36,455 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [496570639] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:06:36,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [415867664] [2021-11-23 03:06:36,456 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:06:36,456 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:06:36,456 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:06:36,456 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:06:36,456 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:06:36,832 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2021-11-23 03:06:37,032 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:06:38,643 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19284#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_860| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_294| Int)) (and (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_860|) (or (and (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_860| 0) (= |#NULL.offset| 0) (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_294| 0) (= |#NULL.base| 0)) (and (= |#NULL.offset| 0) (= |#NULL.base| 0))) (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_294|) (= |__VERIFIER_assert_#in~cond| (ite (= (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_860| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_860| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_860| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_860|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_860| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_860|) (* 2 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_860| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_860| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_860|))) (* 4 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_294|)) 1 0)))) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:06:38,643 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:06:38,643 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:06:38,643 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2021-11-23 03:06:38,643 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [397565163] [2021-11-23 03:06:38,643 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:06:38,644 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-23 03:06:38,644 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:06:38,644 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-23 03:06:38,646 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1028, Invalid=4228, Unknown=0, NotChecked=0, Total=5256 [2021-11-23 03:06:38,646 INFO L87 Difference]: Start difference. First operand 104 states and 132 transitions. Second operand has 35 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 34 states have internal predecessors, (67), 31 states have call successors, (31), 2 states have call predecessors, (31), 1 states have return successors, (30), 30 states have call predecessors, (30), 30 states have call successors, (30) [2021-11-23 03:06:39,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:06:39,993 INFO L93 Difference]: Finished difference Result 112 states and 141 transitions. [2021-11-23 03:06:39,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-23 03:06:39,994 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 34 states have internal predecessors, (67), 31 states have call successors, (31), 2 states have call predecessors, (31), 1 states have return successors, (30), 30 states have call predecessors, (30), 30 states have call successors, (30) Word has length 215 [2021-11-23 03:06:39,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:06:39,995 INFO L225 Difference]: With dead ends: 112 [2021-11-23 03:06:39,996 INFO L226 Difference]: Without dead ends: 107 [2021-11-23 03:06:39,997 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 640 GetRequests, 566 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 293 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=1039, Invalid=4511, Unknown=0, NotChecked=0, Total=5550 [2021-11-23 03:06:39,998 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 2 mSDsluCounter, 2208 mSDsCounter, 0 mSdLazyCounter, 2025 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 2303 SdHoareTripleChecker+Invalid, 2025 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2025 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:06:39,998 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 2303 Invalid, 2025 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2025 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-23 03:06:39,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-11-23 03:06:40,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2021-11-23 03:06:40,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 72 states have (on average 1.0138888888888888) internal successors, (73), 72 states have internal predecessors, (73), 32 states have call successors, (32), 3 states have call predecessors, (32), 2 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2021-11-23 03:06:40,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 136 transitions. [2021-11-23 03:06:40,011 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 136 transitions. Word has length 215 [2021-11-23 03:06:40,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:06:40,012 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 136 transitions. [2021-11-23 03:06:40,013 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 34 states have internal predecessors, (67), 31 states have call successors, (31), 2 states have call predecessors, (31), 1 states have return successors, (30), 30 states have call predecessors, (30), 30 states have call successors, (30) [2021-11-23 03:06:40,013 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 136 transitions. [2021-11-23 03:06:40,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2021-11-23 03:06:40,014 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:06:40,015 INFO L514 BasicCegarLoop]: trace histogram [32, 31, 31, 31, 31, 31, 30, 1, 1, 1, 1, 1] [2021-11-23 03:06:40,030 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-23 03:06:40,223 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:06:40,223 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:06:40,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:06:40,223 INFO L85 PathProgramCache]: Analyzing trace with hash 717904723, now seen corresponding path program 30 times [2021-11-23 03:06:40,224 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:06:40,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [199813177] [2021-11-23 03:06:40,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:06:40,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:06:40,230 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:06:40,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [619155268] [2021-11-23 03:06:40,233 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:06:40,234 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:06:40,234 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:06:40,235 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:06:40,254 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-23 03:06:44,359 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:06:44,360 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:06:44,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 563 conjuncts, 128 conjunts are in the unsatisfiable core [2021-11-23 03:06:44,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:06:45,436 INFO L134 CoverageAnalysis]: Checked inductivity of 3317 backedges. 62 proven. 1395 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2021-11-23 03:06:45,436 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:06:45,742 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:06:45,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [199813177] [2021-11-23 03:06:45,742 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:06:45,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [619155268] [2021-11-23 03:06:45,742 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [619155268] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:06:45,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1785368797] [2021-11-23 03:06:45,743 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:06:45,743 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:06:45,744 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:06:45,744 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:06:45,744 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:06:46,188 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 92 for LOIs [2021-11-23 03:06:46,460 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:06:47,642 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20389#(and (exists ((|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_477| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_902| Int)) (and (= (ite (= (* |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_477| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_902|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_902| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_902|)) 1 0) |__VERIFIER_assert_#in~cond|) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_902|) (<= |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_477| 32767) (<= 0 (+ |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_477| 32768)) (or (and (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_902| 1) (<= |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_477| 1) (= |#NULL.offset| 0) (= |#NULL.base| 0)) (and (= |#NULL.offset| 0) (= |#NULL.base| 0))))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:06:47,643 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:06:47,643 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:06:47,643 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2021-11-23 03:06:47,643 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570031116] [2021-11-23 03:06:47,643 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:06:47,643 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-23 03:06:47,643 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:06:47,644 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-23 03:06:47,644 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=1936, Unknown=0, NotChecked=0, Total=2070 [2021-11-23 03:06:47,645 INFO L87 Difference]: Start difference. First operand 107 states and 136 transitions. Second operand has 36 states, 35 states have (on average 1.9714285714285715) internal successors, (69), 35 states have internal predecessors, (69), 32 states have call successors, (32), 2 states have call predecessors, (32), 1 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2021-11-23 03:06:48,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:06:48,935 INFO L93 Difference]: Finished difference Result 115 states and 145 transitions. [2021-11-23 03:06:48,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-23 03:06:48,935 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 1.9714285714285715) internal successors, (69), 35 states have internal predecessors, (69), 32 states have call successors, (32), 2 states have call predecessors, (32), 1 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) Word has length 222 [2021-11-23 03:06:48,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:06:48,936 INFO L225 Difference]: With dead ends: 115 [2021-11-23 03:06:48,936 INFO L226 Difference]: Without dead ends: 110 [2021-11-23 03:06:48,937 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 411 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=145, Invalid=2111, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 03:06:48,938 INFO L933 BasicCegarLoop]: 100 mSDtfsCounter, 2 mSDsluCounter, 2343 mSDsCounter, 0 mSdLazyCounter, 2154 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 2441 SdHoareTripleChecker+Invalid, 2154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2154 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:06:48,938 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 2441 Invalid, 2154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2154 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-23 03:06:48,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-11-23 03:06:48,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 110. [2021-11-23 03:06:48,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 74 states have (on average 1.0135135135135136) internal successors, (75), 74 states have internal predecessors, (75), 33 states have call successors, (33), 3 states have call predecessors, (33), 2 states have return successors, (32), 32 states have call predecessors, (32), 32 states have call successors, (32) [2021-11-23 03:06:48,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 140 transitions. [2021-11-23 03:06:48,951 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 140 transitions. Word has length 222 [2021-11-23 03:06:48,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:06:48,952 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 140 transitions. [2021-11-23 03:06:48,952 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 1.9714285714285715) internal successors, (69), 35 states have internal predecessors, (69), 32 states have call successors, (32), 2 states have call predecessors, (32), 1 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2021-11-23 03:06:48,952 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 140 transitions. [2021-11-23 03:06:48,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2021-11-23 03:06:48,954 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:06:48,954 INFO L514 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 32, 32, 31, 1, 1, 1, 1, 1] [2021-11-23 03:06:48,966 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-23 03:06:49,163 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-11-23 03:06:49,163 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:06:49,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:06:49,163 INFO L85 PathProgramCache]: Analyzing trace with hash -887260353, now seen corresponding path program 31 times [2021-11-23 03:06:49,163 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:06:49,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1194265038] [2021-11-23 03:06:49,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:06:49,164 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:06:49,168 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:06:49,168 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1137970414] [2021-11-23 03:06:49,168 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:06:49,168 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:06:49,168 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:06:49,169 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:06:49,170 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-23 03:06:50,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:06:50,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 580 conjuncts, 133 conjunts are in the unsatisfiable core [2021-11-23 03:06:50,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:06:51,942 INFO L134 CoverageAnalysis]: Checked inductivity of 3536 backedges. 64 proven. 1488 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2021-11-23 03:06:51,942 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:06:56,629 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:06:56,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1194265038] [2021-11-23 03:06:56,629 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:06:56,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1137970414] [2021-11-23 03:06:56,629 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1137970414] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:06:56,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1928749417] [2021-11-23 03:06:56,631 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:06:56,631 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:06:56,631 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:06:56,631 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:06:56,631 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:06:56,982 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2021-11-23 03:06:57,149 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:06:58,530 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22186#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:06:58,530 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:06:58,531 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:06:58,531 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2021-11-23 03:06:58,531 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1552097214] [2021-11-23 03:06:58,531 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:06:58,531 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-23 03:06:58,532 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:06:58,532 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-23 03:06:58,532 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1158, Invalid=4694, Unknown=0, NotChecked=0, Total=5852 [2021-11-23 03:06:58,533 INFO L87 Difference]: Start difference. First operand 110 states and 140 transitions. Second operand has 37 states, 36 states have (on average 1.9722222222222223) internal successors, (71), 36 states have internal predecessors, (71), 33 states have call successors, (33), 2 states have call predecessors, (33), 1 states have return successors, (32), 32 states have call predecessors, (32), 32 states have call successors, (32) [2021-11-23 03:07:00,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:07:00,020 INFO L93 Difference]: Finished difference Result 118 states and 149 transitions. [2021-11-23 03:07:00,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-23 03:07:00,020 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 1.9722222222222223) internal successors, (71), 36 states have internal predecessors, (71), 33 states have call successors, (33), 2 states have call predecessors, (33), 1 states have return successors, (32), 32 states have call predecessors, (32), 32 states have call successors, (32) Word has length 229 [2021-11-23 03:07:00,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:07:00,022 INFO L225 Difference]: With dead ends: 118 [2021-11-23 03:07:00,022 INFO L226 Difference]: Without dead ends: 113 [2021-11-23 03:07:00,023 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 682 GetRequests, 604 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 311 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=1169, Invalid=4993, Unknown=0, NotChecked=0, Total=6162 [2021-11-23 03:07:00,023 INFO L933 BasicCegarLoop]: 103 mSDtfsCounter, 2 mSDsluCounter, 2482 mSDsCounter, 0 mSdLazyCounter, 2287 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 2583 SdHoareTripleChecker+Invalid, 2287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2287 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:07:00,024 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 2583 Invalid, 2287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2287 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-23 03:07:00,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-23 03:07:00,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2021-11-23 03:07:00,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 76 states have (on average 1.013157894736842) internal successors, (77), 76 states have internal predecessors, (77), 34 states have call successors, (34), 3 states have call predecessors, (34), 2 states have return successors, (33), 33 states have call predecessors, (33), 33 states have call successors, (33) [2021-11-23 03:07:00,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 144 transitions. [2021-11-23 03:07:00,036 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 144 transitions. Word has length 229 [2021-11-23 03:07:00,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:07:00,037 INFO L470 AbstractCegarLoop]: Abstraction has 113 states and 144 transitions. [2021-11-23 03:07:00,037 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 36 states have (on average 1.9722222222222223) internal successors, (71), 36 states have internal predecessors, (71), 33 states have call successors, (33), 2 states have call predecessors, (33), 1 states have return successors, (32), 32 states have call predecessors, (32), 32 states have call successors, (32) [2021-11-23 03:07:00,038 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 144 transitions. [2021-11-23 03:07:00,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2021-11-23 03:07:00,039 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:07:00,040 INFO L514 BasicCegarLoop]: trace histogram [34, 33, 33, 33, 33, 33, 32, 1, 1, 1, 1, 1] [2021-11-23 03:07:00,054 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-23 03:07:00,246 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-11-23 03:07:00,246 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:07:00,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:07:00,247 INFO L85 PathProgramCache]: Analyzing trace with hash -1083254317, now seen corresponding path program 32 times [2021-11-23 03:07:00,247 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:07:00,247 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [41219555] [2021-11-23 03:07:00,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:07:00,247 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:07:00,251 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:07:00,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1186765513] [2021-11-23 03:07:00,252 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:07:00,252 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:07:00,252 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:07:00,257 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:07:00,260 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-23 03:07:04,655 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2021-11-23 03:07:04,655 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:07:04,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 597 conjuncts, 136 conjunts are in the unsatisfiable core [2021-11-23 03:07:04,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:07:05,852 INFO L134 CoverageAnalysis]: Checked inductivity of 3762 backedges. 66 proven. 1584 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2021-11-23 03:07:05,852 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:07:06,149 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:07:06,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [41219555] [2021-11-23 03:07:06,149 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:07:06,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1186765513] [2021-11-23 03:07:06,150 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1186765513] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:07:06,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [209688555] [2021-11-23 03:07:06,151 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:07:06,151 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:07:06,151 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:07:06,152 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:07:06,152 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:07:06,527 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2021-11-23 03:07:06,691 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:07:07,681 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23355#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:07:07,681 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:07:07,681 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:07:07,681 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2021-11-23 03:07:07,682 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727618883] [2021-11-23 03:07:07,682 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:07:07,682 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-23 03:07:07,682 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:07:07,682 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-23 03:07:07,683 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=2116, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 03:07:07,683 INFO L87 Difference]: Start difference. First operand 113 states and 144 transitions. Second operand has 38 states, 37 states have (on average 1.972972972972973) internal successors, (73), 37 states have internal predecessors, (73), 34 states have call successors, (34), 2 states have call predecessors, (34), 1 states have return successors, (33), 33 states have call predecessors, (33), 33 states have call successors, (33) [2021-11-23 03:07:09,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:07:09,146 INFO L93 Difference]: Finished difference Result 121 states and 153 transitions. [2021-11-23 03:07:09,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-23 03:07:09,151 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 1.972972972972973) internal successors, (73), 37 states have internal predecessors, (73), 34 states have call successors, (34), 2 states have call predecessors, (34), 1 states have return successors, (33), 33 states have call predecessors, (33), 33 states have call successors, (33) Word has length 236 [2021-11-23 03:07:09,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:07:09,153 INFO L225 Difference]: With dead ends: 121 [2021-11-23 03:07:09,153 INFO L226 Difference]: Without dead ends: 116 [2021-11-23 03:07:09,153 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 437 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=151, Invalid=2299, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 03:07:09,154 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 2 mSDsluCounter, 2625 mSDsCounter, 0 mSdLazyCounter, 2424 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 2729 SdHoareTripleChecker+Invalid, 2424 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2424 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:07:09,154 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 2729 Invalid, 2424 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2424 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-23 03:07:09,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-11-23 03:07:09,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 116. [2021-11-23 03:07:09,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 78 states have (on average 1.0128205128205128) internal successors, (79), 78 states have internal predecessors, (79), 35 states have call successors, (35), 3 states have call predecessors, (35), 2 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-23 03:07:09,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 148 transitions. [2021-11-23 03:07:09,168 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 148 transitions. Word has length 236 [2021-11-23 03:07:09,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:07:09,169 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 148 transitions. [2021-11-23 03:07:09,169 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 37 states have (on average 1.972972972972973) internal successors, (73), 37 states have internal predecessors, (73), 34 states have call successors, (34), 2 states have call predecessors, (34), 1 states have return successors, (33), 33 states have call predecessors, (33), 33 states have call successors, (33) [2021-11-23 03:07:09,169 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 148 transitions. [2021-11-23 03:07:09,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2021-11-23 03:07:09,171 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:07:09,171 INFO L514 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 34, 34, 33, 1, 1, 1, 1, 1] [2021-11-23 03:07:09,183 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-23 03:07:09,380 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:07:09,380 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:07:09,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:07:09,380 INFO L85 PathProgramCache]: Analyzing trace with hash 983936191, now seen corresponding path program 33 times [2021-11-23 03:07:09,381 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:07:09,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [794538378] [2021-11-23 03:07:09,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:07:09,381 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:07:09,385 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:07:09,386 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1667516111] [2021-11-23 03:07:09,386 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:07:09,386 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:07:09,386 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:07:09,388 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:07:09,390 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-23 03:07:16,328 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:07:16,329 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:07:16,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 614 conjuncts, 140 conjunts are in the unsatisfiable core [2021-11-23 03:07:16,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:07:17,554 INFO L134 CoverageAnalysis]: Checked inductivity of 3995 backedges. 68 proven. 1683 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2021-11-23 03:07:17,554 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:07:17,869 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:07:17,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [794538378] [2021-11-23 03:07:17,869 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:07:17,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1667516111] [2021-11-23 03:07:17,869 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1667516111] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:07:17,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [381243616] [2021-11-23 03:07:17,871 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:07:17,871 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:07:17,871 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:07:17,871 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:07:17,872 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:07:18,207 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2021-11-23 03:07:18,375 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:07:19,368 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24556#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:07:19,368 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:07:19,368 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:07:19,368 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2021-11-23 03:07:19,368 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1480448418] [2021-11-23 03:07:19,368 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:07:19,369 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-23 03:07:19,369 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:07:19,369 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-23 03:07:19,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2209, Unknown=0, NotChecked=0, Total=2352 [2021-11-23 03:07:19,370 INFO L87 Difference]: Start difference. First operand 116 states and 148 transitions. Second operand has 39 states, 38 states have (on average 1.9736842105263157) internal successors, (75), 38 states have internal predecessors, (75), 35 states have call successors, (35), 2 states have call predecessors, (35), 1 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-23 03:07:20,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:07:20,957 INFO L93 Difference]: Finished difference Result 124 states and 157 transitions. [2021-11-23 03:07:20,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-23 03:07:20,957 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 1.9736842105263157) internal successors, (75), 38 states have internal predecessors, (75), 35 states have call successors, (35), 2 states have call predecessors, (35), 1 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) Word has length 243 [2021-11-23 03:07:20,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:07:20,959 INFO L225 Difference]: With dead ends: 124 [2021-11-23 03:07:20,959 INFO L226 Difference]: Without dead ends: 119 [2021-11-23 03:07:20,960 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 450 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=154, Invalid=2396, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 03:07:20,960 INFO L933 BasicCegarLoop]: 109 mSDtfsCounter, 2 mSDsluCounter, 2772 mSDsCounter, 0 mSdLazyCounter, 2565 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 2879 SdHoareTripleChecker+Invalid, 2565 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2565 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:07:20,961 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 2879 Invalid, 2565 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2565 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2021-11-23 03:07:20,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-11-23 03:07:20,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2021-11-23 03:07:20,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 80 states have (on average 1.0125) internal successors, (81), 80 states have internal predecessors, (81), 36 states have call successors, (36), 3 states have call predecessors, (36), 2 states have return successors, (35), 35 states have call predecessors, (35), 35 states have call successors, (35) [2021-11-23 03:07:20,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 152 transitions. [2021-11-23 03:07:20,975 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 152 transitions. Word has length 243 [2021-11-23 03:07:20,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:07:20,975 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 152 transitions. [2021-11-23 03:07:20,976 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 1.9736842105263157) internal successors, (75), 38 states have internal predecessors, (75), 35 states have call successors, (35), 2 states have call predecessors, (35), 1 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-23 03:07:20,976 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 152 transitions. [2021-11-23 03:07:20,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 251 [2021-11-23 03:07:20,978 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:07:20,978 INFO L514 BasicCegarLoop]: trace histogram [36, 35, 35, 35, 35, 35, 34, 1, 1, 1, 1, 1] [2021-11-23 03:07:20,990 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-23 03:07:21,188 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-23 03:07:21,188 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:07:21,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:07:21,189 INFO L85 PathProgramCache]: Analyzing trace with hash 1360263251, now seen corresponding path program 34 times [2021-11-23 03:07:21,189 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:07:21,189 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1937239912] [2021-11-23 03:07:21,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:07:21,190 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:07:21,198 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:07:21,198 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1174719764] [2021-11-23 03:07:21,199 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:07:21,199 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:07:21,199 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:07:21,200 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:07:21,218 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-23 03:07:22,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:07:22,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 631 conjuncts, 144 conjunts are in the unsatisfiable core [2021-11-23 03:07:22,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:07:24,039 INFO L134 CoverageAnalysis]: Checked inductivity of 4235 backedges. 70 proven. 1785 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2021-11-23 03:07:24,040 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:07:24,359 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:07:24,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1937239912] [2021-11-23 03:07:24,359 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:07:24,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1174719764] [2021-11-23 03:07:24,359 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1174719764] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:07:24,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [745554344] [2021-11-23 03:07:24,360 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:07:24,360 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:07:24,361 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:07:24,361 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:07:24,361 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:07:24,721 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2021-11-23 03:07:24,892 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:07:26,055 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25789#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_344| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1115| Int)) (and (or (and (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1115| 0) (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_344| 0) (= |#NULL.offset| 0) (= |#NULL.base| 0)) (and (= |#NULL.offset| 0) (= |#NULL.base| 0))) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1115|) (= |__VERIFIER_assert_#in~cond| (ite (= (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1115| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1115| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1115| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1115|) (* 2 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1115| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1115| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1115|)) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1115| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1115|)) (* 4 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_344|)) 1 0)) (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_344|))) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:07:26,055 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:07:26,055 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:07:26,055 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2021-11-23 03:07:26,056 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414698026] [2021-11-23 03:07:26,056 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:07:26,056 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-23 03:07:26,056 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:07:26,057 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-23 03:07:26,057 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=2304, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 03:07:26,057 INFO L87 Difference]: Start difference. First operand 119 states and 152 transitions. Second operand has 40 states, 39 states have (on average 1.9743589743589745) internal successors, (77), 39 states have internal predecessors, (77), 36 states have call successors, (36), 2 states have call predecessors, (36), 1 states have return successors, (35), 35 states have call predecessors, (35), 35 states have call successors, (35) [2021-11-23 03:07:27,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:07:27,724 INFO L93 Difference]: Finished difference Result 127 states and 161 transitions. [2021-11-23 03:07:27,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-23 03:07:27,725 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 39 states have (on average 1.9743589743589745) internal successors, (77), 39 states have internal predecessors, (77), 36 states have call successors, (36), 2 states have call predecessors, (36), 1 states have return successors, (35), 35 states have call predecessors, (35), 35 states have call successors, (35) Word has length 250 [2021-11-23 03:07:27,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:07:27,726 INFO L225 Difference]: With dead ends: 127 [2021-11-23 03:07:27,727 INFO L226 Difference]: Without dead ends: 122 [2021-11-23 03:07:27,727 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 514 GetRequests, 463 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=157, Invalid=2495, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 03:07:27,728 INFO L933 BasicCegarLoop]: 112 mSDtfsCounter, 2 mSDsluCounter, 2923 mSDsCounter, 0 mSdLazyCounter, 2710 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 3033 SdHoareTripleChecker+Invalid, 2710 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2710 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:07:27,728 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 3033 Invalid, 2710 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2710 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2021-11-23 03:07:27,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-11-23 03:07:27,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 122. [2021-11-23 03:07:27,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 82 states have (on average 1.0121951219512195) internal successors, (83), 82 states have internal predecessors, (83), 37 states have call successors, (37), 3 states have call predecessors, (37), 2 states have return successors, (36), 36 states have call predecessors, (36), 36 states have call successors, (36) [2021-11-23 03:07:27,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 156 transitions. [2021-11-23 03:07:27,743 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 156 transitions. Word has length 250 [2021-11-23 03:07:27,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:07:27,743 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 156 transitions. [2021-11-23 03:07:27,744 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 39 states have (on average 1.9743589743589745) internal successors, (77), 39 states have internal predecessors, (77), 36 states have call successors, (36), 2 states have call predecessors, (36), 1 states have return successors, (35), 35 states have call predecessors, (35), 35 states have call successors, (35) [2021-11-23 03:07:27,744 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 156 transitions. [2021-11-23 03:07:27,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2021-11-23 03:07:27,746 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:07:27,746 INFO L514 BasicCegarLoop]: trace histogram [37, 36, 36, 36, 36, 36, 35, 1, 1, 1, 1, 1] [2021-11-23 03:07:27,758 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-23 03:07:27,953 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-11-23 03:07:27,954 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:07:27,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:07:27,954 INFO L85 PathProgramCache]: Analyzing trace with hash -918995393, now seen corresponding path program 35 times [2021-11-23 03:07:27,954 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:07:27,954 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1867205319] [2021-11-23 03:07:27,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:07:27,954 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:07:27,958 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:07:27,959 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [498083851] [2021-11-23 03:07:27,959 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:07:27,959 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:07:27,959 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:07:27,960 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:07:27,970 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-23 03:07:38,435 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2021-11-23 03:07:38,436 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:07:38,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 648 conjuncts, 148 conjunts are in the unsatisfiable core [2021-11-23 03:07:38,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:07:39,762 INFO L134 CoverageAnalysis]: Checked inductivity of 4482 backedges. 72 proven. 1890 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2021-11-23 03:07:39,762 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:07:40,115 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:07:40,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1867205319] [2021-11-23 03:07:40,115 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:07:40,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [498083851] [2021-11-23 03:07:40,115 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [498083851] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:07:40,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1352716103] [2021-11-23 03:07:40,117 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:07:40,117 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:07:40,117 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:07:40,117 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:07:40,117 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:07:40,481 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2021-11-23 03:07:40,654 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:07:41,759 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27054#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_354| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1163| Int)) (and (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1163|) (or (and (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1163| 0) (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_354| 0) (= |#NULL.offset| 0) (= |#NULL.base| 0)) (and (= |#NULL.offset| 0) (= |#NULL.base| 0))) (= |__VERIFIER_assert_#in~cond| (ite (= (* 4 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_354|) (+ (* 2 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1163| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1163| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1163|)) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1163| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1163|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1163| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1163| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1163| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1163|))) 1 0)) (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_354|))))' at error location [2021-11-23 03:07:41,760 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:07:41,760 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:07:41,760 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2021-11-23 03:07:41,760 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1162136482] [2021-11-23 03:07:41,760 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:07:41,760 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-23 03:07:41,761 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:07:41,761 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-23 03:07:41,762 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=2401, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 03:07:41,762 INFO L87 Difference]: Start difference. First operand 122 states and 156 transitions. Second operand has 41 states, 40 states have (on average 1.975) internal successors, (79), 40 states have internal predecessors, (79), 37 states have call successors, (37), 2 states have call predecessors, (37), 1 states have return successors, (36), 36 states have call predecessors, (36), 36 states have call successors, (36) [2021-11-23 03:07:43,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:07:43,436 INFO L93 Difference]: Finished difference Result 130 states and 165 transitions. [2021-11-23 03:07:43,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-23 03:07:43,437 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 40 states have (on average 1.975) internal successors, (79), 40 states have internal predecessors, (79), 37 states have call successors, (37), 2 states have call predecessors, (37), 1 states have return successors, (36), 36 states have call predecessors, (36), 36 states have call successors, (36) Word has length 257 [2021-11-23 03:07:43,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:07:43,438 INFO L225 Difference]: With dead ends: 130 [2021-11-23 03:07:43,439 INFO L226 Difference]: Without dead ends: 125 [2021-11-23 03:07:43,439 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 528 GetRequests, 476 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=160, Invalid=2596, Unknown=0, NotChecked=0, Total=2756 [2021-11-23 03:07:43,440 INFO L933 BasicCegarLoop]: 115 mSDtfsCounter, 2 mSDsluCounter, 3078 mSDsCounter, 0 mSdLazyCounter, 2859 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 3191 SdHoareTripleChecker+Invalid, 2859 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2859 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:07:43,440 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 3191 Invalid, 2859 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2859 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2021-11-23 03:07:43,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-11-23 03:07:43,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 125. [2021-11-23 03:07:43,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 84 states have (on average 1.0119047619047619) internal successors, (85), 84 states have internal predecessors, (85), 38 states have call successors, (38), 3 states have call predecessors, (38), 2 states have return successors, (37), 37 states have call predecessors, (37), 37 states have call successors, (37) [2021-11-23 03:07:43,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 160 transitions. [2021-11-23 03:07:43,454 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 160 transitions. Word has length 257 [2021-11-23 03:07:43,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:07:43,455 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 160 transitions. [2021-11-23 03:07:43,455 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 40 states have (on average 1.975) internal successors, (79), 40 states have internal predecessors, (79), 37 states have call successors, (37), 2 states have call predecessors, (37), 1 states have return successors, (36), 36 states have call predecessors, (36), 36 states have call successors, (36) [2021-11-23 03:07:43,455 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 160 transitions. [2021-11-23 03:07:43,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2021-11-23 03:07:43,457 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:07:43,458 INFO L514 BasicCegarLoop]: trace histogram [38, 37, 37, 37, 37, 37, 36, 1, 1, 1, 1, 1] [2021-11-23 03:07:43,467 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-23 03:07:43,667 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-23 03:07:43,667 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:07:43,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:07:43,668 INFO L85 PathProgramCache]: Analyzing trace with hash 1109505747, now seen corresponding path program 36 times [2021-11-23 03:07:43,668 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:07:43,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1734748599] [2021-11-23 03:07:43,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:07:43,668 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:07:43,674 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:07:43,675 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [816773405] [2021-11-23 03:07:43,675 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:07:43,675 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:07:43,675 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:07:43,676 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:07:43,678 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-23 03:07:51,284 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:07:51,285 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:07:51,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 665 conjuncts, 152 conjunts are in the unsatisfiable core [2021-11-23 03:07:51,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:07:52,784 INFO L134 CoverageAnalysis]: Checked inductivity of 4736 backedges. 74 proven. 1998 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2021-11-23 03:07:52,784 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:07:53,124 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:07:53,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1734748599] [2021-11-23 03:07:53,125 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:07:53,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [816773405] [2021-11-23 03:07:53,125 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [816773405] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:07:53,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1826870187] [2021-11-23 03:07:53,126 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:07:53,126 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:07:53,126 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:07:53,126 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:07:53,127 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:07:53,540 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2021-11-23 03:07:53,728 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:07:55,069 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28351#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_364| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1212| Int)) (and (or (and (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1212| 0) (= |#NULL.offset| 0) (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_364| 0) (= |#NULL.base| 0)) (and (= |#NULL.offset| 0) (= |#NULL.base| 0))) (= (ite (= (* 4 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_364|) (+ (* 2 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1212| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1212| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1212|)) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1212| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1212| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1212| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1212|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1212| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1212|))) 1 0) |__VERIFIER_assert_#in~cond|) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1212|) (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_364|))) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:07:55,069 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:07:55,069 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:07:55,070 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2021-11-23 03:07:55,070 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115140734] [2021-11-23 03:07:55,070 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:07:55,070 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-23 03:07:55,070 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:07:55,071 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-23 03:07:55,072 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=2500, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 03:07:55,072 INFO L87 Difference]: Start difference. First operand 125 states and 160 transitions. Second operand has 42 states, 41 states have (on average 1.975609756097561) internal successors, (81), 41 states have internal predecessors, (81), 38 states have call successors, (38), 2 states have call predecessors, (38), 1 states have return successors, (37), 37 states have call predecessors, (37), 37 states have call successors, (37) [2021-11-23 03:07:56,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:07:56,940 INFO L93 Difference]: Finished difference Result 133 states and 169 transitions. [2021-11-23 03:07:56,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-23 03:07:56,941 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 41 states have (on average 1.975609756097561) internal successors, (81), 41 states have internal predecessors, (81), 38 states have call successors, (38), 2 states have call predecessors, (38), 1 states have return successors, (37), 37 states have call predecessors, (37), 37 states have call successors, (37) Word has length 264 [2021-11-23 03:07:56,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:07:56,942 INFO L225 Difference]: With dead ends: 133 [2021-11-23 03:07:56,942 INFO L226 Difference]: Without dead ends: 128 [2021-11-23 03:07:56,943 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 542 GetRequests, 489 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=163, Invalid=2699, Unknown=0, NotChecked=0, Total=2862 [2021-11-23 03:07:56,943 INFO L933 BasicCegarLoop]: 118 mSDtfsCounter, 2 mSDsluCounter, 3237 mSDsCounter, 0 mSdLazyCounter, 3012 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 3353 SdHoareTripleChecker+Invalid, 3012 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3012 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-23 03:07:56,944 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 3353 Invalid, 3012 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3012 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-11-23 03:07:56,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-23 03:07:56,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 128. [2021-11-23 03:07:56,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 86 states have (on average 1.0116279069767442) internal successors, (87), 86 states have internal predecessors, (87), 39 states have call successors, (39), 3 states have call predecessors, (39), 2 states have return successors, (38), 38 states have call predecessors, (38), 38 states have call successors, (38) [2021-11-23 03:07:56,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 164 transitions. [2021-11-23 03:07:56,957 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 164 transitions. Word has length 264 [2021-11-23 03:07:56,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:07:56,958 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 164 transitions. [2021-11-23 03:07:56,958 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 41 states have (on average 1.975609756097561) internal successors, (81), 41 states have internal predecessors, (81), 38 states have call successors, (38), 2 states have call predecessors, (38), 1 states have return successors, (37), 37 states have call predecessors, (37), 37 states have call successors, (37) [2021-11-23 03:07:56,959 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 164 transitions. [2021-11-23 03:07:56,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 272 [2021-11-23 03:07:56,960 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:07:56,961 INFO L514 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 38, 38, 37, 1, 1, 1, 1, 1] [2021-11-23 03:07:56,979 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-23 03:07:57,171 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:07:57,171 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:07:57,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:07:57,172 INFO L85 PathProgramCache]: Analyzing trace with hash 259010495, now seen corresponding path program 37 times [2021-11-23 03:07:57,172 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:07:57,172 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [677832391] [2021-11-23 03:07:57,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:07:57,172 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:07:57,177 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:07:57,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1535308703] [2021-11-23 03:07:57,177 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:07:57,177 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:07:57,177 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:07:57,179 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:07:57,183 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-23 03:07:58,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:07:58,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 682 conjuncts, 156 conjunts are in the unsatisfiable core [2021-11-23 03:07:58,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:08:00,183 INFO L134 CoverageAnalysis]: Checked inductivity of 4997 backedges. 76 proven. 2109 refuted. 0 times theorem prover too weak. 2812 trivial. 0 not checked. [2021-11-23 03:08:00,183 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:08:00,514 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:08:00,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [677832391] [2021-11-23 03:08:00,514 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:08:00,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1535308703] [2021-11-23 03:08:00,514 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1535308703] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:08:00,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [409962445] [2021-11-23 03:08:00,515 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:08:00,515 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:08:00,516 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:08:00,516 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:08:00,516 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:08:00,898 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2021-11-23 03:08:01,060 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:08:02,320 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29680#(and (exists ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1262| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_374| Int)) (and (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_374|) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1262|) (= |__VERIFIER_assert_#in~cond| (ite (= (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1262| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1262| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1262| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1262|) (* 2 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1262| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1262| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1262|)) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1262| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1262|)) (* 4 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_374|)) 1 0)) (or (and (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_374| 0) (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1262| 0) (= |#NULL.offset| 0) (= |#NULL.base| 0)) (and (= |#NULL.offset| 0) (= |#NULL.base| 0))))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:08:02,320 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:08:02,320 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:08:02,321 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2021-11-23 03:08:02,321 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1456397804] [2021-11-23 03:08:02,321 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:08:02,321 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-23 03:08:02,321 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:08:02,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-23 03:08:02,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=2601, Unknown=0, NotChecked=0, Total=2756 [2021-11-23 03:08:02,322 INFO L87 Difference]: Start difference. First operand 128 states and 164 transitions. Second operand has 43 states, 42 states have (on average 1.9761904761904763) internal successors, (83), 42 states have internal predecessors, (83), 39 states have call successors, (39), 2 states have call predecessors, (39), 1 states have return successors, (38), 38 states have call predecessors, (38), 38 states have call successors, (38) [2021-11-23 03:08:04,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:08:04,228 INFO L93 Difference]: Finished difference Result 136 states and 173 transitions. [2021-11-23 03:08:04,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-23 03:08:04,229 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 42 states have (on average 1.9761904761904763) internal successors, (83), 42 states have internal predecessors, (83), 39 states have call successors, (39), 2 states have call predecessors, (39), 1 states have return successors, (38), 38 states have call predecessors, (38), 38 states have call successors, (38) Word has length 271 [2021-11-23 03:08:04,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:08:04,230 INFO L225 Difference]: With dead ends: 136 [2021-11-23 03:08:04,230 INFO L226 Difference]: Without dead ends: 131 [2021-11-23 03:08:04,231 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 556 GetRequests, 502 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=166, Invalid=2804, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 03:08:04,231 INFO L933 BasicCegarLoop]: 121 mSDtfsCounter, 2 mSDsluCounter, 3400 mSDsCounter, 0 mSdLazyCounter, 3169 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 3519 SdHoareTripleChecker+Invalid, 3169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-23 03:08:04,231 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 3519 Invalid, 3169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3169 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-11-23 03:08:04,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-11-23 03:08:04,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 131. [2021-11-23 03:08:04,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 88 states have (on average 1.0113636363636365) internal successors, (89), 88 states have internal predecessors, (89), 40 states have call successors, (40), 3 states have call predecessors, (40), 2 states have return successors, (39), 39 states have call predecessors, (39), 39 states have call successors, (39) [2021-11-23 03:08:04,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 168 transitions. [2021-11-23 03:08:04,246 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 168 transitions. Word has length 271 [2021-11-23 03:08:04,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:08:04,246 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 168 transitions. [2021-11-23 03:08:04,247 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 42 states have (on average 1.9761904761904763) internal successors, (83), 42 states have internal predecessors, (83), 39 states have call successors, (39), 2 states have call predecessors, (39), 1 states have return successors, (38), 38 states have call predecessors, (38), 38 states have call successors, (38) [2021-11-23 03:08:04,247 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 168 transitions. [2021-11-23 03:08:04,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 279 [2021-11-23 03:08:04,249 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:08:04,249 INFO L514 BasicCegarLoop]: trace histogram [40, 39, 39, 39, 39, 39, 38, 1, 1, 1, 1, 1] [2021-11-23 03:08:04,264 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-23 03:08:04,457 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-23 03:08:04,458 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:08:04,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:08:04,458 INFO L85 PathProgramCache]: Analyzing trace with hash -1627384493, now seen corresponding path program 38 times [2021-11-23 03:08:04,459 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:08:04,459 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [565721349] [2021-11-23 03:08:04,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:08:04,459 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:08:04,465 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:08:04,466 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1499999653] [2021-11-23 03:08:04,466 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:08:04,466 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:08:04,466 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:08:04,467 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:08:04,490 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-23 03:08:25,129 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2021-11-23 03:08:25,129 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:08:25,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 699 conjuncts, 160 conjunts are in the unsatisfiable core [2021-11-23 03:08:25,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:08:26,615 INFO L134 CoverageAnalysis]: Checked inductivity of 5265 backedges. 78 proven. 2223 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2021-11-23 03:08:26,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:08:26,962 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:08:26,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [565721349] [2021-11-23 03:08:26,962 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:08:26,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1499999653] [2021-11-23 03:08:26,963 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1499999653] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:08:26,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [325250574] [2021-11-23 03:08:26,964 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:08:26,964 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:08:26,965 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:08:26,965 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:08:26,965 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:08:27,368 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2021-11-23 03:08:27,559 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:08:28,683 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31041#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:08:28,683 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:08:28,683 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:08:28,684 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2021-11-23 03:08:28,684 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1742663769] [2021-11-23 03:08:28,684 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:08:28,684 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-23 03:08:28,685 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:08:28,685 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-23 03:08:28,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=2704, Unknown=0, NotChecked=0, Total=2862 [2021-11-23 03:08:28,686 INFO L87 Difference]: Start difference. First operand 131 states and 168 transitions. Second operand has 44 states, 43 states have (on average 1.9767441860465116) internal successors, (85), 43 states have internal predecessors, (85), 40 states have call successors, (40), 2 states have call predecessors, (40), 1 states have return successors, (39), 39 states have call predecessors, (39), 39 states have call successors, (39) [2021-11-23 03:08:30,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:08:30,813 INFO L93 Difference]: Finished difference Result 139 states and 177 transitions. [2021-11-23 03:08:30,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-23 03:08:30,814 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 43 states have (on average 1.9767441860465116) internal successors, (85), 43 states have internal predecessors, (85), 40 states have call successors, (40), 2 states have call predecessors, (40), 1 states have return successors, (39), 39 states have call predecessors, (39), 39 states have call successors, (39) Word has length 278 [2021-11-23 03:08:30,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:08:30,816 INFO L225 Difference]: With dead ends: 139 [2021-11-23 03:08:30,816 INFO L226 Difference]: Without dead ends: 134 [2021-11-23 03:08:30,816 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 570 GetRequests, 515 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=169, Invalid=2911, Unknown=0, NotChecked=0, Total=3080 [2021-11-23 03:08:30,817 INFO L933 BasicCegarLoop]: 124 mSDtfsCounter, 2 mSDsluCounter, 3567 mSDsCounter, 0 mSdLazyCounter, 3330 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 3689 SdHoareTripleChecker+Invalid, 3330 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3330 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:08:30,817 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 3689 Invalid, 3330 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3330 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2021-11-23 03:08:30,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-11-23 03:08:30,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 134. [2021-11-23 03:08:30,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 90 states have (on average 1.011111111111111) internal successors, (91), 90 states have internal predecessors, (91), 41 states have call successors, (41), 3 states have call predecessors, (41), 2 states have return successors, (40), 40 states have call predecessors, (40), 40 states have call successors, (40) [2021-11-23 03:08:30,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 172 transitions. [2021-11-23 03:08:30,833 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 172 transitions. Word has length 278 [2021-11-23 03:08:30,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:08:30,834 INFO L470 AbstractCegarLoop]: Abstraction has 134 states and 172 transitions. [2021-11-23 03:08:30,834 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 43 states have (on average 1.9767441860465116) internal successors, (85), 43 states have internal predecessors, (85), 40 states have call successors, (40), 2 states have call predecessors, (40), 1 states have return successors, (39), 39 states have call predecessors, (39), 39 states have call successors, (39) [2021-11-23 03:08:30,834 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 172 transitions. [2021-11-23 03:08:30,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2021-11-23 03:08:30,836 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:08:30,837 INFO L514 BasicCegarLoop]: trace histogram [41, 40, 40, 40, 40, 40, 39, 1, 1, 1, 1, 1] [2021-11-23 03:08:30,861 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-23 03:08:31,047 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-23 03:08:31,048 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:08:31,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:08:31,048 INFO L85 PathProgramCache]: Analyzing trace with hash -1142783681, now seen corresponding path program 39 times [2021-11-23 03:08:31,048 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:08:31,049 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [342507441] [2021-11-23 03:08:31,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:08:31,049 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:08:31,056 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:08:31,056 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [872677503] [2021-11-23 03:08:31,057 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:08:31,057 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:08:31,057 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:08:31,058 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:08:31,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-23 03:08:40,789 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:08:40,789 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:08:40,801 INFO L263 TraceCheckSpWp]: Trace formula consists of 716 conjuncts, 164 conjunts are in the unsatisfiable core [2021-11-23 03:08:40,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:08:42,278 INFO L134 CoverageAnalysis]: Checked inductivity of 5540 backedges. 80 proven. 2340 refuted. 0 times theorem prover too weak. 3120 trivial. 0 not checked. [2021-11-23 03:08:42,278 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:08:42,625 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:08:42,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [342507441] [2021-11-23 03:08:42,625 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:08:42,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [872677503] [2021-11-23 03:08:42,625 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [872677503] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:08:42,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [162640831] [2021-11-23 03:08:42,626 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:08:42,626 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:08:42,626 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:08:42,626 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:08:42,626 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:08:42,983 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2021-11-23 03:08:43,153 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:08:44,391 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32434#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_394| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1365| Int)) (and (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_394|) (or (and (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1365| 0) (= |#NULL.offset| 0) (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_394| 0) (= |#NULL.base| 0)) (and (= |#NULL.offset| 0) (= |#NULL.base| 0))) (= (ite (= (+ (* 2 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1365| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1365| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1365|)) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1365| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1365| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1365| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1365|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1365| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1365|)) (* 4 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_394|)) 1 0) |__VERIFIER_assert_#in~cond|) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1365|))) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:08:44,391 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:08:44,392 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:08:44,392 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2021-11-23 03:08:44,392 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075433444] [2021-11-23 03:08:44,392 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:08:44,392 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-23 03:08:44,393 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:08:44,393 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-23 03:08:44,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=2809, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 03:08:44,394 INFO L87 Difference]: Start difference. First operand 134 states and 172 transitions. Second operand has 45 states, 44 states have (on average 1.9772727272727273) internal successors, (87), 44 states have internal predecessors, (87), 41 states have call successors, (41), 2 states have call predecessors, (41), 1 states have return successors, (40), 40 states have call predecessors, (40), 40 states have call successors, (40) [2021-11-23 03:08:46,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:08:46,461 INFO L93 Difference]: Finished difference Result 142 states and 181 transitions. [2021-11-23 03:08:46,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-11-23 03:08:46,462 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 44 states have (on average 1.9772727272727273) internal successors, (87), 44 states have internal predecessors, (87), 41 states have call successors, (41), 2 states have call predecessors, (41), 1 states have return successors, (40), 40 states have call predecessors, (40), 40 states have call successors, (40) Word has length 285 [2021-11-23 03:08:46,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:08:46,463 INFO L225 Difference]: With dead ends: 142 [2021-11-23 03:08:46,463 INFO L226 Difference]: Without dead ends: 137 [2021-11-23 03:08:46,464 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 584 GetRequests, 528 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=172, Invalid=3020, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 03:08:46,465 INFO L933 BasicCegarLoop]: 127 mSDtfsCounter, 2 mSDsluCounter, 3738 mSDsCounter, 0 mSdLazyCounter, 3495 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 3863 SdHoareTripleChecker+Invalid, 3495 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3495 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:08:46,465 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 3863 Invalid, 3495 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3495 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2021-11-23 03:08:46,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-11-23 03:08:46,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 137. [2021-11-23 03:08:46,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 92 states have (on average 1.0108695652173914) internal successors, (93), 92 states have internal predecessors, (93), 42 states have call successors, (42), 3 states have call predecessors, (42), 2 states have return successors, (41), 41 states have call predecessors, (41), 41 states have call successors, (41) [2021-11-23 03:08:46,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 176 transitions. [2021-11-23 03:08:46,480 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 176 transitions. Word has length 285 [2021-11-23 03:08:46,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:08:46,481 INFO L470 AbstractCegarLoop]: Abstraction has 137 states and 176 transitions. [2021-11-23 03:08:46,481 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 44 states have (on average 1.9772727272727273) internal successors, (87), 44 states have internal predecessors, (87), 41 states have call successors, (41), 2 states have call predecessors, (41), 1 states have return successors, (40), 40 states have call predecessors, (40), 40 states have call successors, (40) [2021-11-23 03:08:46,482 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 176 transitions. [2021-11-23 03:08:46,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 293 [2021-11-23 03:08:46,484 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:08:46,484 INFO L514 BasicCegarLoop]: trace histogram [42, 41, 41, 41, 41, 41, 40, 1, 1, 1, 1, 1] [2021-11-23 03:08:46,510 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-23 03:08:46,696 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:08:46,696 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:08:46,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:08:46,696 INFO L85 PathProgramCache]: Analyzing trace with hash -1642654765, now seen corresponding path program 40 times [2021-11-23 03:08:46,696 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:08:46,696 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1867617212] [2021-11-23 03:08:46,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:08:46,697 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:08:46,701 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:08:46,701 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [686499582] [2021-11-23 03:08:46,701 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:08:46,701 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:08:46,701 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:08:46,702 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:08:46,703 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-23 03:08:48,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:08:48,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 733 conjuncts, 168 conjunts are in the unsatisfiable core [2021-11-23 03:08:48,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:08:50,190 INFO L134 CoverageAnalysis]: Checked inductivity of 5822 backedges. 82 proven. 2460 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2021-11-23 03:08:50,190 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:08:50,577 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:08:50,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1867617212] [2021-11-23 03:08:50,577 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:08:50,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [686499582] [2021-11-23 03:08:50,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [686499582] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:08:50,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [51648251] [2021-11-23 03:08:50,578 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:08:50,578 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:08:50,578 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:08:50,579 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:08:50,579 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:08:51,026 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 92 for LOIs [2021-11-23 03:08:51,344 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:08:52,547 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33859#(and (exists ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1418| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_404| Int)) (and (or (and (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1418|) (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_404|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0)) (and (= (select |#length| 3) 12) (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_404| 0) (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1418| 0) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= 9 (select |#length| 2)) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0))) (= (ite (= (+ (* 2 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1418| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1418| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1418|)) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1418| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1418|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1418| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1418| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1418| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1418|)) (* 4 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_404|)) 1 0) |__VERIFIER_assert_#in~cond|))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0))' at error location [2021-11-23 03:08:52,547 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:08:52,547 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:08:52,548 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2021-11-23 03:08:52,548 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [508366405] [2021-11-23 03:08:52,548 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:08:52,548 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-23 03:08:52,548 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:08:52,549 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-23 03:08:52,549 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=2916, Unknown=0, NotChecked=0, Total=3080 [2021-11-23 03:08:52,549 INFO L87 Difference]: Start difference. First operand 137 states and 176 transitions. Second operand has 46 states, 45 states have (on average 1.9777777777777779) internal successors, (89), 45 states have internal predecessors, (89), 42 states have call successors, (42), 2 states have call predecessors, (42), 1 states have return successors, (41), 41 states have call predecessors, (41), 41 states have call successors, (41) [2021-11-23 03:08:54,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:08:54,753 INFO L93 Difference]: Finished difference Result 145 states and 185 transitions. [2021-11-23 03:08:54,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-23 03:08:54,754 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 1.9777777777777779) internal successors, (89), 45 states have internal predecessors, (89), 42 states have call successors, (42), 2 states have call predecessors, (42), 1 states have return successors, (41), 41 states have call predecessors, (41), 41 states have call successors, (41) Word has length 292 [2021-11-23 03:08:54,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:08:54,755 INFO L225 Difference]: With dead ends: 145 [2021-11-23 03:08:54,755 INFO L226 Difference]: Without dead ends: 140 [2021-11-23 03:08:54,755 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 598 GetRequests, 541 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=175, Invalid=3131, Unknown=0, NotChecked=0, Total=3306 [2021-11-23 03:08:54,756 INFO L933 BasicCegarLoop]: 130 mSDtfsCounter, 2 mSDsluCounter, 3913 mSDsCounter, 0 mSdLazyCounter, 3664 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 4041 SdHoareTripleChecker+Invalid, 3664 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3664 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:08:54,756 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 4041 Invalid, 3664 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3664 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2021-11-23 03:08:54,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-11-23 03:08:54,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 140. [2021-11-23 03:08:54,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 94 states have (on average 1.0106382978723405) internal successors, (95), 94 states have internal predecessors, (95), 43 states have call successors, (43), 3 states have call predecessors, (43), 2 states have return successors, (42), 42 states have call predecessors, (42), 42 states have call successors, (42) [2021-11-23 03:08:54,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 180 transitions. [2021-11-23 03:08:54,772 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 180 transitions. Word has length 292 [2021-11-23 03:08:54,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:08:54,772 INFO L470 AbstractCegarLoop]: Abstraction has 140 states and 180 transitions. [2021-11-23 03:08:54,773 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 1.9777777777777779) internal successors, (89), 45 states have internal predecessors, (89), 42 states have call successors, (42), 2 states have call predecessors, (42), 1 states have return successors, (41), 41 states have call predecessors, (41), 41 states have call successors, (41) [2021-11-23 03:08:54,773 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 180 transitions. [2021-11-23 03:08:54,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2021-11-23 03:08:54,775 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:08:54,775 INFO L514 BasicCegarLoop]: trace histogram [43, 42, 42, 42, 42, 42, 41, 1, 1, 1, 1, 1] [2021-11-23 03:08:54,792 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2021-11-23 03:08:54,983 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:08:54,984 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:08:54,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:08:54,984 INFO L85 PathProgramCache]: Analyzing trace with hash 321401535, now seen corresponding path program 41 times [2021-11-23 03:08:54,985 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:08:54,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1713154713] [2021-11-23 03:08:54,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:08:54,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:08:54,996 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:08:54,996 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1425646046] [2021-11-23 03:08:54,996 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:08:54,996 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:08:54,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:08:54,997 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:08:54,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-23 03:09:11,234 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2021-11-23 03:09:11,235 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:09:11,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 750 conjuncts, 172 conjunts are in the unsatisfiable core [2021-11-23 03:09:11,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:09:12,967 INFO L134 CoverageAnalysis]: Checked inductivity of 6111 backedges. 84 proven. 2583 refuted. 0 times theorem prover too weak. 3444 trivial. 0 not checked. [2021-11-23 03:09:12,968 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:09:13,445 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:09:13,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1713154713] [2021-11-23 03:09:13,445 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:09:13,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1425646046] [2021-11-23 03:09:13,445 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1425646046] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:09:13,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [429512081] [2021-11-23 03:09:13,447 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 03:09:13,447 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:09:13,447 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:09:13,447 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:09:13,448 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:09:14,020 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 92 for LOIs [2021-11-23 03:09:14,267 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:09:15,696 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '35316#(and (exists ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1472| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_414| Int)) (and (= (ite (= (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1472| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1472| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1472| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1472|) (* 2 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1472| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1472| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1472|)) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1472| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1472|)) (* 4 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_414|)) 1 0) |__VERIFIER_assert_#in~cond|) (or (and (= (select |#length| 3) 12) (= |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1472| 0) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= 9 (select |#length| 2)) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_414| 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= (select (select |#memory_int| 1) 1) 0) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0)) (and (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_414|) (= |#NULL.offset| 0) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_1472|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0))' at error location [2021-11-23 03:09:15,697 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:09:15,697 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:09:15,697 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2021-11-23 03:09:15,697 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929358539] [2021-11-23 03:09:15,697 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:09:15,697 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-23 03:09:15,698 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:09:15,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-23 03:09:15,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=3025, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 03:09:15,699 INFO L87 Difference]: Start difference. First operand 140 states and 180 transitions. Second operand has 47 states, 46 states have (on average 1.9782608695652173) internal successors, (91), 46 states have internal predecessors, (91), 43 states have call successors, (43), 2 states have call predecessors, (43), 1 states have return successors, (42), 42 states have call predecessors, (42), 42 states have call successors, (42) [2021-11-23 03:09:18,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:09:18,076 INFO L93 Difference]: Finished difference Result 148 states and 189 transitions. [2021-11-23 03:09:18,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-23 03:09:18,077 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 46 states have (on average 1.9782608695652173) internal successors, (91), 46 states have internal predecessors, (91), 43 states have call successors, (43), 2 states have call predecessors, (43), 1 states have return successors, (42), 42 states have call predecessors, (42), 42 states have call successors, (42) Word has length 299 [2021-11-23 03:09:18,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:09:18,078 INFO L225 Difference]: With dead ends: 148 [2021-11-23 03:09:18,078 INFO L226 Difference]: Without dead ends: 143 [2021-11-23 03:09:18,079 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 612 GetRequests, 554 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=178, Invalid=3244, Unknown=0, NotChecked=0, Total=3422 [2021-11-23 03:09:18,079 INFO L933 BasicCegarLoop]: 133 mSDtfsCounter, 2 mSDsluCounter, 4092 mSDsCounter, 0 mSdLazyCounter, 3837 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 4223 SdHoareTripleChecker+Invalid, 3837 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3837 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:09:18,079 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 4223 Invalid, 3837 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3837 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 03:09:18,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-11-23 03:09:18,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 143. [2021-11-23 03:09:18,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 96 states have (on average 1.0104166666666667) internal successors, (97), 96 states have internal predecessors, (97), 44 states have call successors, (44), 3 states have call predecessors, (44), 2 states have return successors, (43), 43 states have call predecessors, (43), 43 states have call successors, (43) [2021-11-23 03:09:18,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 184 transitions. [2021-11-23 03:09:18,095 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 184 transitions. Word has length 299 [2021-11-23 03:09:18,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:09:18,096 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 184 transitions. [2021-11-23 03:09:18,096 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 46 states have (on average 1.9782608695652173) internal successors, (91), 46 states have internal predecessors, (91), 43 states have call successors, (43), 2 states have call predecessors, (43), 1 states have return successors, (42), 42 states have call predecessors, (42), 42 states have call successors, (42) [2021-11-23 03:09:18,097 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 184 transitions. [2021-11-23 03:09:18,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2021-11-23 03:09:18,099 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:09:18,099 INFO L514 BasicCegarLoop]: trace histogram [44, 43, 43, 43, 43, 43, 42, 1, 1, 1, 1, 1] [2021-11-23 03:09:18,125 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-23 03:09:18,312 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-11-23 03:09:18,312 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:09:18,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:09:18,312 INFO L85 PathProgramCache]: Analyzing trace with hash 533639763, now seen corresponding path program 42 times [2021-11-23 03:09:18,312 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:09:18,312 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [833512048] [2021-11-23 03:09:18,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:09:18,313 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:09:18,319 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:09:18,320 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2116168741] [2021-11-23 03:09:18,320 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:09:18,320 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:09:18,320 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:09:18,321 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:09:18,338 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_93faadd9-d79e-460f-a08c-2be3511ea4ae/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process