./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound50.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_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/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_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/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_54ec7985-a1e8-4f17-b019-9c3455b7e285/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 ca2134f8a32f49a0943527ee47fd89b4eb01286294fd09a8197c7c707de74c1d --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:14:02,921 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:14:02,924 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:14:02,965 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:14:02,966 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:14:02,968 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:14:02,970 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:14:02,973 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:14:02,976 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:14:02,977 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:14:02,979 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:14:02,981 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:14:02,983 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:14:02,987 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:14:02,989 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:14:02,993 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:14:02,996 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:14:03,006 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:14:03,008 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:14:03,011 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:14:03,014 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:14:03,019 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:14:03,021 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:14:03,024 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:14:03,032 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:14:03,032 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:14:03,033 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:14:03,034 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:14:03,035 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:14:03,037 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:14:03,038 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:14:03,039 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:14:03,041 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:14:03,042 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:14:03,043 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:14:03,044 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:14:03,045 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:14:03,046 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:14:03,046 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:14:03,047 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:14:03,047 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:14:03,048 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 03:14:03,080 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:14:03,081 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:14:03,081 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:14:03,081 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:14:03,082 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:14:03,083 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:14:03,083 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:14:03,083 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:14:03,083 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:14:03,091 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:14:03,091 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:14:03,092 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:14:03,092 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:14:03,092 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:14:03,092 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:14:03,093 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:14:03,093 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:14:03,093 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:14:03,094 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:14:03,094 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:14:03,095 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:14:03,095 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:14:03,095 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:14:03,095 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 03:14:03,096 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:14:03,096 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 03:14:03,096 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:14:03,097 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 03:14:03,097 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:14:03,097 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 03:14:03,097 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:14:03,098 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:14:03,098 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:14:03,098 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:14:03,099 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:14:03,099 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 03:14:03,099 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:14:03,099 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:14:03,100 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 03:14:03,100 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:14:03,100 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:14:03,100 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_54ec7985-a1e8-4f17-b019-9c3455b7e285/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ca2134f8a32f49a0943527ee47fd89b4eb01286294fd09a8197c7c707de74c1d [2021-11-23 03:14:03,408 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:14:03,433 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:14:03,436 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:14:03,438 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:14:03,439 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:14:03,440 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound50.c [2021-11-23 03:14:03,536 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/data/f109a64e3/56ee592ebb36415898c6bdb59d3cb958/FLAG2ec250552 [2021-11-23 03:14:04,076 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:14:04,077 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound50.c [2021-11-23 03:14:04,090 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/data/f109a64e3/56ee592ebb36415898c6bdb59d3cb958/FLAG2ec250552 [2021-11-23 03:14:04,426 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/data/f109a64e3/56ee592ebb36415898c6bdb59d3cb958 [2021-11-23 03:14:04,429 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:14:04,431 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:14:04,450 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:14:04,450 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:14:04,454 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:14:04,455 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:14:04" (1/1) ... [2021-11-23 03:14:04,456 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@55d1e5dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:14:04, skipping insertion in model container [2021-11-23 03:14:04,456 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:14:04" (1/1) ... [2021-11-23 03:14:04,465 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:14:04,490 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:14:04,664 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_54ec7985-a1e8-4f17-b019-9c3455b7e285/sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound50.c[535,548] [2021-11-23 03:14:04,719 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:14:04,747 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:14:04,763 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_54ec7985-a1e8-4f17-b019-9c3455b7e285/sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound50.c[535,548] [2021-11-23 03:14:04,776 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:14:04,792 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:14:04,793 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:14:04 WrapperNode [2021-11-23 03:14:04,793 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:14:04,795 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:14:04,795 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:14:04,795 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:14:04,804 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:14:04" (1/1) ... [2021-11-23 03:14:04,813 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:14:04" (1/1) ... [2021-11-23 03:14:04,837 INFO L137 Inliner]: procedures = 14, calls = 13, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 67 [2021-11-23 03:14:04,838 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:14:04,838 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:14:04,839 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:14:04,839 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:14:04,849 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:14:04" (1/1) ... [2021-11-23 03:14:04,850 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:14:04" (1/1) ... [2021-11-23 03:14:04,851 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:14:04" (1/1) ... [2021-11-23 03:14:04,852 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:14:04" (1/1) ... [2021-11-23 03:14:04,856 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:14:04" (1/1) ... [2021-11-23 03:14:04,872 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:14:04" (1/1) ... [2021-11-23 03:14:04,876 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:14:04" (1/1) ... [2021-11-23 03:14:04,884 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:14:04,885 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:14:04,888 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:14:04,888 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:14:04,889 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:14:04" (1/1) ... [2021-11-23 03:14:04,899 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:14:04,914 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:14:04,940 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:14:04,958 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:14:04,999 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:14:05,000 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-23 03:14:05,001 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-23 03:14:05,001 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 03:14:05,001 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:14:05,001 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:14:05,002 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-23 03:14:05,002 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-23 03:14:05,089 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:14:05,091 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:14:05,322 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:14:05,346 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:14:05,347 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-23 03:14:05,350 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:14:05 BoogieIcfgContainer [2021-11-23 03:14:05,350 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:14:05,353 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:14:05,353 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:14:05,365 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:14:05,365 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:14:04" (1/3) ... [2021-11-23 03:14:05,366 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c9ab42e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:14:05, skipping insertion in model container [2021-11-23 03:14:05,373 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:14:04" (2/3) ... [2021-11-23 03:14:05,374 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c9ab42e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:14:05, skipping insertion in model container [2021-11-23 03:14:05,374 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:14:05" (3/3) ... [2021-11-23 03:14:05,376 INFO L111 eAbstractionObserver]: Analyzing ICFG fermat1-ll_unwindbound50.c [2021-11-23 03:14:05,382 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:14:05,396 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 03:14:05,476 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:14:05,486 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 03:14:05,487 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 03:14:05,506 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 18 states have internal predecessors, (28), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-23 03:14:05,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-23 03:14:05,513 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:14:05,514 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:14:05,515 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:14:05,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:14:05,521 INFO L85 PathProgramCache]: Analyzing trace with hash -438729207, now seen corresponding path program 1 times [2021-11-23 03:14:05,533 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:14:05,534 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [666354125] [2021-11-23 03:14:05,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:14:05,535 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:14:05,693 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:14:05,694 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [198867594] [2021-11-23 03:14:05,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:14:05,695 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:14:05,696 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:14:05,698 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:14:05,721 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 03:14:05,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:14:05,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-23 03:14:05,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:14:05,950 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:14:05,950 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:14:05,951 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:14:05,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [666354125] [2021-11-23 03:14:05,952 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:14:05,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [198867594] [2021-11-23 03:14:05,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [198867594] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:14:05,956 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:14:05,956 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 03:14:05,959 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726330270] [2021-11-23 03:14:05,961 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:14:05,967 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 03:14:05,968 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:14:06,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 03:14:06,025 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 03:14:06,028 INFO L87 Difference]: Start difference. First operand has 27 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 18 states have internal predecessors, (28), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 03:14:06,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:14:06,080 INFO L93 Difference]: Finished difference Result 48 states and 77 transitions. [2021-11-23 03:14:06,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 03:14:06,085 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 13 [2021-11-23 03:14:06,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:14:06,097 INFO L225 Difference]: With dead ends: 48 [2021-11-23 03:14:06,097 INFO L226 Difference]: Without dead ends: 25 [2021-11-23 03:14:06,102 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 03:14:06,109 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:14:06,112 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 33 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:14:06,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-23 03:14:06,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-11-23 03:14:06,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 16 states have (on average 1.4375) internal successors, (23), 17 states have internal predecessors, (23), 6 states have call successors, (6), 2 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 03:14:06,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 34 transitions. [2021-11-23 03:14:06,176 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 34 transitions. Word has length 13 [2021-11-23 03:14:06,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:14:06,179 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 34 transitions. [2021-11-23 03:14:06,180 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 03:14:06,181 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 34 transitions. [2021-11-23 03:14:06,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-23 03:14:06,186 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:14:06,186 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:14:06,233 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 03:14:06,411 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:14:06,412 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:14:06,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:14:06,413 INFO L85 PathProgramCache]: Analyzing trace with hash 2071776720, now seen corresponding path program 1 times [2021-11-23 03:14:06,413 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:14:06,414 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [615303364] [2021-11-23 03:14:06,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:14:06,414 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:14:06,427 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:14:06,427 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1458866533] [2021-11-23 03:14:06,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:14:06,428 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:14:06,428 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:14:06,431 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:14:06,453 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 03:14:06,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:14:06,513 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:14:06,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:14:06,627 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:14:06,628 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:14:06,628 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:14:06,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [615303364] [2021-11-23 03:14:06,629 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:14:06,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1458866533] [2021-11-23 03:14:06,629 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1458866533] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:14:06,629 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:14:06,630 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:14:06,630 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1530871235] [2021-11-23 03:14:06,630 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:14:06,631 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:14:06,631 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:14:06,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:14:06,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:14:06,633 INFO L87 Difference]: Start difference. First operand 25 states and 34 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 03:14:06,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:14:06,659 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2021-11-23 03:14:06,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:14:06,659 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2021-11-23 03:14:06,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:14:06,661 INFO L225 Difference]: With dead ends: 34 [2021-11-23 03:14:06,661 INFO L226 Difference]: Without dead ends: 27 [2021-11-23 03:14:06,662 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:14:06,663 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 0 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:14:06,664 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 82 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:14:06,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-23 03:14:06,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-11-23 03:14:06,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 6 states have call successors, (6), 2 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 03:14:06,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 36 transitions. [2021-11-23 03:14:06,674 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 36 transitions. Word has length 14 [2021-11-23 03:14:06,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:14:06,675 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 36 transitions. [2021-11-23 03:14:06,675 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 03:14:06,675 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 36 transitions. [2021-11-23 03:14:06,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-23 03:14:06,676 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:14:06,676 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:14:06,709 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 03:14:06,897 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:14:06,898 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:14:06,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:14:06,899 INFO L85 PathProgramCache]: Analyzing trace with hash 2073445016, now seen corresponding path program 1 times [2021-11-23 03:14:06,899 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:14:06,900 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [316784867] [2021-11-23 03:14:06,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:14:06,900 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:14:06,912 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:14:06,913 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [467650387] [2021-11-23 03:14:06,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:14:06,917 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:14:06,917 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:14:06,918 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:14:06,941 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 03:14:06,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:14:07,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 03:14:07,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:14:07,231 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:14:07,231 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:14:07,231 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:14:07,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [316784867] [2021-11-23 03:14:07,232 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:14:07,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [467650387] [2021-11-23 03:14:07,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [467650387] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:14:07,232 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:14:07,232 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 03:14:07,233 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [259350183] [2021-11-23 03:14:07,233 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:14:07,233 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:14:07,233 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:14:07,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:14:07,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:14:07,234 INFO L87 Difference]: Start difference. First operand 27 states and 36 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 03:14:09,298 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 03:14:10,668 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.07s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 03:14:10,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:14:10,684 INFO L93 Difference]: Finished difference Result 46 states and 63 transitions. [2021-11-23 03:14:10,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:14:10,684 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2021-11-23 03:14:10,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:14:10,686 INFO L225 Difference]: With dead ends: 46 [2021-11-23 03:14:10,686 INFO L226 Difference]: Without dead ends: 44 [2021-11-23 03:14:10,687 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:14:10,688 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 16 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:14:10,689 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 94 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 50 Invalid, 1 Unknown, 0 Unchecked, 3.4s Time] [2021-11-23 03:14:10,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-23 03:14:10,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2021-11-23 03:14:10,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 31 states have internal predecessors, (43), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-23 03:14:10,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 60 transitions. [2021-11-23 03:14:10,709 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 60 transitions. Word has length 14 [2021-11-23 03:14:10,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:14:10,710 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 60 transitions. [2021-11-23 03:14:10,710 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 03:14:10,711 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 60 transitions. [2021-11-23 03:14:10,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-23 03:14:10,712 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:14:10,712 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:14:10,738 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-23 03:14:10,917 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:14:10,918 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:14:10,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:14:10,919 INFO L85 PathProgramCache]: Analyzing trace with hash 1668710205, now seen corresponding path program 1 times [2021-11-23 03:14:10,919 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:14:10,919 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2006837094] [2021-11-23 03:14:10,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:14:10,920 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:14:10,930 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:14:10,931 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [614109592] [2021-11-23 03:14:10,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:14:10,931 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:14:10,932 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:14:10,939 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:14:10,945 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 03:14:11,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:14:11,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 03:14:11,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:14:11,275 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:14:11,275 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:14:11,538 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:14:11,539 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:14:11,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2006837094] [2021-11-23 03:14:11,539 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:14:11,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [614109592] [2021-11-23 03:14:11,540 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [614109592] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:14:11,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [900007130] [2021-11-23 03:14:11,563 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-23 03:14:11,563 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:14:11,569 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:14:11,575 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:14:11,576 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:14:12,326 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 142 for LOIs [2021-11-23 03:14:12,769 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-23 03:14:12,866 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:14:20,925 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [900007130] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:14:20,925 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:14:20,926 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [8, 8] total 21 [2021-11-23 03:14:20,927 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611138587] [2021-11-23 03:14:20,927 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:14:20,927 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-23 03:14:20,928 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:14:20,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-23 03:14:20,929 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=348, Unknown=0, NotChecked=0, Total=420 [2021-11-23 03:14:20,930 INFO L87 Difference]: Start difference. First operand 43 states and 60 transitions. Second operand has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 states have call successors, (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 03:14:21,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:14:21,327 INFO L93 Difference]: Finished difference Result 57 states and 74 transitions. [2021-11-23 03:14:21,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 03:14:21,328 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 20 [2021-11-23 03:14:21,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:14:21,330 INFO L225 Difference]: With dead ends: 57 [2021-11-23 03:14:21,330 INFO L226 Difference]: Without dead ends: 50 [2021-11-23 03:14:21,331 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 35 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=72, Invalid=348, Unknown=0, NotChecked=0, Total=420 [2021-11-23 03:14:21,333 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 6 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 55 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:14:21,333 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 110 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 40 Invalid, 0 Unknown, 55 Unchecked, 0.4s Time] [2021-11-23 03:14:21,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-23 03:14:21,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2021-11-23 03:14:21,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 34 states have (on average 1.3823529411764706) internal successors, (47), 35 states have internal predecessors, (47), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-23 03:14:21,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 66 transitions. [2021-11-23 03:14:21,350 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 66 transitions. Word has length 20 [2021-11-23 03:14:21,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:14:21,350 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 66 transitions. [2021-11-23 03:14:21,351 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 states have call successors, (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 03:14:21,351 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 66 transitions. [2021-11-23 03:14:21,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-23 03:14:21,352 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:14:21,352 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:14:21,400 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 03:14:21,577 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:14:21,578 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:14:21,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:14:21,578 INFO L85 PathProgramCache]: Analyzing trace with hash 1338452232, now seen corresponding path program 1 times [2021-11-23 03:14:21,578 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:14:21,579 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [611603250] [2021-11-23 03:14:21,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:14:21,579 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:14:21,588 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:14:21,588 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [888470731] [2021-11-23 03:14:21,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:14:21,588 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:14:21,603 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:14:21,604 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:14:21,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 03:14:21,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:14:21,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 03:14:21,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:14:21,807 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:14:21,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:14:21,960 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:14:21,960 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:14:21,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [611603250] [2021-11-23 03:14:21,961 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:14:21,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [888470731] [2021-11-23 03:14:21,961 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [888470731] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:14:21,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1837612414] [2021-11-23 03:14:21,966 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-23 03:14:21,966 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:14:21,967 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:14:21,968 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:14:21,969 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:14:22,598 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 160 for LOIs [2021-11-23 03:14:22,979 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-23 03:14:23,049 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:14:38,193 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1837612414] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:14:38,194 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:14:38,194 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [7, 6] total 22 [2021-11-23 03:14:38,194 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [209043985] [2021-11-23 03:14:38,194 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:14:38,195 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-23 03:14:38,195 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:14:38,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-23 03:14:38,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=390, Unknown=0, NotChecked=0, Total=462 [2021-11-23 03:14:38,196 INFO L87 Difference]: Start difference. First operand 49 states and 66 transitions. Second operand has 15 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 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 03:14:38,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:14:38,697 INFO L93 Difference]: Finished difference Result 91 states and 126 transitions. [2021-11-23 03:14:38,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 03:14:38,698 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 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) Word has length 22 [2021-11-23 03:14:38,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:14:38,701 INFO L225 Difference]: With dead ends: 91 [2021-11-23 03:14:38,701 INFO L226 Difference]: Without dead ends: 56 [2021-11-23 03:14:38,702 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 41 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 15.2s TimeCoverageRelationStatistics Valid=72, Invalid=390, Unknown=0, NotChecked=0, Total=462 [2021-11-23 03:14:38,703 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 4 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 169 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 51 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:14:38,704 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 169 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 82 Invalid, 0 Unknown, 51 Unchecked, 0.5s Time] [2021-11-23 03:14:38,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-23 03:14:38,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-11-23 03:14:38,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 39 states have (on average 1.3333333333333333) internal successors, (52), 41 states have internal predecessors, (52), 11 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-23 03:14:38,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 73 transitions. [2021-11-23 03:14:38,722 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 73 transitions. Word has length 22 [2021-11-23 03:14:38,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:14:38,722 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 73 transitions. [2021-11-23 03:14:38,723 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 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 03:14:38,723 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 73 transitions. [2021-11-23 03:14:38,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-23 03:14:38,725 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:14:38,725 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:14:38,760 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-23 03:14:38,949 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:14:38,950 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:14:38,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:14:38,950 INFO L85 PathProgramCache]: Analyzing trace with hash 1808313670, now seen corresponding path program 1 times [2021-11-23 03:14:38,951 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:14:38,951 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1144746568] [2021-11-23 03:14:38,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:14:38,951 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:14:38,960 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:14:38,960 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1030972658] [2021-11-23 03:14:38,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:14:38,960 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:14:38,960 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:14:38,962 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:14:38,979 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 03:14:39,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:14:39,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 03:14:39,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:14:39,251 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:14:39,251 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:14:39,479 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:14:39,479 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:14:39,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1144746568] [2021-11-23 03:14:39,479 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:14:39,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1030972658] [2021-11-23 03:14:39,480 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1030972658] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:14:39,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [37548621] [2021-11-23 03:14:39,490 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2021-11-23 03:14:39,490 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:14:39,490 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:14:39,491 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:14:39,491 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:14:41,632 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 129 for LOIs [2021-11-23 03:14:41,925 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-23 03:14:41,974 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:14:54,087 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1287#(and (<= 2 ~counter~0) (<= 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 03:14:54,087 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:14:54,088 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:14:54,088 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 11 [2021-11-23 03:14:54,088 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148384919] [2021-11-23 03:14:54,088 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:14:54,089 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-23 03:14:54,089 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:14:54,090 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-23 03:14:54,090 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=607, Unknown=0, NotChecked=0, Total=702 [2021-11-23 03:14:54,091 INFO L87 Difference]: Start difference. First operand 56 states and 73 transitions. Second operand has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 9 states have internal predecessors, (31), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-23 03:14:54,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:14:54,369 INFO L93 Difference]: Finished difference Result 76 states and 101 transitions. [2021-11-23 03:14:54,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 03:14:54,370 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 9 states have internal predecessors, (31), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6) Word has length 30 [2021-11-23 03:14:54,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:14:54,372 INFO L225 Difference]: With dead ends: 76 [2021-11-23 03:14:54,372 INFO L226 Difference]: Without dead ends: 72 [2021-11-23 03:14:54,373 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=110, Invalid=702, Unknown=0, NotChecked=0, Total=812 [2021-11-23 03:14:54,374 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 79 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:14:54,374 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 162 Invalid, 175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 149 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:14:54,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-11-23 03:14:54,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 58. [2021-11-23 03:14:54,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 41 states have (on average 1.2926829268292683) internal successors, (53), 42 states have internal predecessors, (53), 11 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-23 03:14:54,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 74 transitions. [2021-11-23 03:14:54,394 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 74 transitions. Word has length 30 [2021-11-23 03:14:54,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:14:54,394 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 74 transitions. [2021-11-23 03:14:54,395 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 9 states have internal predecessors, (31), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-23 03:14:54,395 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 74 transitions. [2021-11-23 03:14:54,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-23 03:14:54,396 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:14:54,397 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:14:54,439 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 03:14:54,612 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-23 03:14:54,612 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:14:54,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:14:54,613 INFO L85 PathProgramCache]: Analyzing trace with hash -2135719167, now seen corresponding path program 1 times [2021-11-23 03:14:54,613 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:14:54,613 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1581747393] [2021-11-23 03:14:54,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:14:54,613 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:14:54,619 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:14:54,619 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [391415030] [2021-11-23 03:14:54,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:14:54,619 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:14:54,619 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:14:54,630 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:14:54,633 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 03:14:54,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:14:54,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 03:14:54,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:14:54,768 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:14:54,768 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:14:54,884 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:14:54,885 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:14:54,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1581747393] [2021-11-23 03:14:54,885 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:14:54,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [391415030] [2021-11-23 03:14:54,885 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [391415030] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 03:14:54,886 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:14:54,886 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5] total 10 [2021-11-23 03:14:54,886 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073225095] [2021-11-23 03:14:54,886 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:14:54,887 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:14:54,887 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:14:54,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:14:54,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-11-23 03:14:54,888 INFO L87 Difference]: Start difference. First operand 58 states and 74 transitions. Second operand has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-23 03:14:54,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:14:54,949 INFO L93 Difference]: Finished difference Result 99 states and 132 transitions. [2021-11-23 03:14:54,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:14:54,950 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 32 [2021-11-23 03:14:54,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:14:54,952 INFO L225 Difference]: With dead ends: 99 [2021-11-23 03:14:54,953 INFO L226 Difference]: Without dead ends: 62 [2021-11-23 03:14:54,953 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-11-23 03:14:54,955 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 15 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:14:54,956 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 125 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:14:54,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-23 03:14:54,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2021-11-23 03:14:54,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 44 states have (on average 1.2954545454545454) internal successors, (57), 44 states have internal predecessors, (57), 11 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-23 03:14:54,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 78 transitions. [2021-11-23 03:14:54,994 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 78 transitions. Word has length 32 [2021-11-23 03:14:54,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:14:54,996 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 78 transitions. [2021-11-23 03:14:54,996 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-23 03:14:54,997 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 78 transitions. [2021-11-23 03:14:55,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-23 03:14:55,005 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:14:55,006 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:14:55,047 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 03:14:55,221 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:14:55,222 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:14:55,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:14:55,222 INFO L85 PathProgramCache]: Analyzing trace with hash -301470394, now seen corresponding path program 1 times [2021-11-23 03:14:55,222 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:14:55,222 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1941010717] [2021-11-23 03:14:55,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:14:55,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:14:55,234 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:14:55,234 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [830078876] [2021-11-23 03:14:55,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:14:55,236 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:14:55,236 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:14:55,237 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:14:55,247 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 03:14:55,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:14:55,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 03:14:55,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:14:55,379 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:14:55,379 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:14:55,493 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:14:55,493 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:14:55,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1941010717] [2021-11-23 03:14:55,494 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:14:55,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [830078876] [2021-11-23 03:14:55,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [830078876] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:14:55,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1803981962] [2021-11-23 03:14:55,497 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2021-11-23 03:14:55,498 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:14:55,498 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:14:55,498 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:14:55,499 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:14:59,178 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2021-11-23 03:14:59,187 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-23 03:14:59,250 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:15:09,853 WARN L227 SmtUtils]: Spent 6.70s on a formula simplification. DAG size of input: 138 DAG size of output: 122 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:15:15,047 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2119#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:15:15,047 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:15:15,047 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:15:15,047 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2021-11-23 03:15:15,048 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542983366] [2021-11-23 03:15:15,048 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:15:15,048 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 03:15:15,049 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:15:15,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 03:15:15,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=669, Unknown=0, NotChecked=0, Total=812 [2021-11-23 03:15:15,052 INFO L87 Difference]: Start difference. First operand 61 states and 78 transitions. Second operand has 10 states, 10 states have (on average 3.8) internal successors, (38), 10 states have internal predecessors, (38), 7 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-11-23 03:15:15,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:15:15,272 INFO L93 Difference]: Finished difference Result 186 states and 247 transitions. [2021-11-23 03:15:15,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 03:15:15,273 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 10 states have internal predecessors, (38), 7 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 34 [2021-11-23 03:15:15,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:15:15,275 INFO L225 Difference]: With dead ends: 186 [2021-11-23 03:15:15,275 INFO L226 Difference]: Without dead ends: 149 [2021-11-23 03:15:15,276 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 372 ImplicationChecksByTransitivity, 15.9s TimeCoverageRelationStatistics Valid=173, Invalid=883, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 03:15:15,277 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 83 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:15:15,277 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 150 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:15:15,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-11-23 03:15:15,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 133. [2021-11-23 03:15:15,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 98 states have (on average 1.3061224489795917) internal successors, (128), 100 states have internal predecessors, (128), 23 states have call successors, (23), 12 states have call predecessors, (23), 11 states have return successors, (22), 20 states have call predecessors, (22), 22 states have call successors, (22) [2021-11-23 03:15:15,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 173 transitions. [2021-11-23 03:15:15,332 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 173 transitions. Word has length 34 [2021-11-23 03:15:15,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:15:15,334 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 173 transitions. [2021-11-23 03:15:15,334 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 10 states have internal predecessors, (38), 7 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-11-23 03:15:15,334 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 173 transitions. [2021-11-23 03:15:15,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-23 03:15:15,335 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:15:15,336 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:15:15,386 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 03:15:15,552 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:15:15,552 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:15:15,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:15:15,553 INFO L85 PathProgramCache]: Analyzing trace with hash 753982024, now seen corresponding path program 1 times [2021-11-23 03:15:15,553 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:15:15,553 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1630611950] [2021-11-23 03:15:15,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:15,553 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:15:15,558 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:15:15,558 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1333397378] [2021-11-23 03:15:15,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:15,558 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:15:15,559 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:15:15,560 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:15:15,565 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 03:15:15,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:15:15,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:15:15,620 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:15:15,719 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 03:15:15,720 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:15:15,720 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:15:15,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1630611950] [2021-11-23 03:15:15,720 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:15:15,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1333397378] [2021-11-23 03:15:15,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1333397378] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:15:15,721 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:15:15,721 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:15:15,721 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1309262029] [2021-11-23 03:15:15,722 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:15:15,722 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:15:15,722 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:15:15,723 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:15:15,723 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:15:15,723 INFO L87 Difference]: Start difference. First operand 133 states and 173 transitions. Second operand has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-23 03:15:15,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:15:15,782 INFO L93 Difference]: Finished difference Result 228 states and 314 transitions. [2021-11-23 03:15:15,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:15:15,783 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 38 [2021-11-23 03:15:15,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:15:15,785 INFO L225 Difference]: With dead ends: 228 [2021-11-23 03:15:15,786 INFO L226 Difference]: Without dead ends: 173 [2021-11-23 03:15:15,787 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:15:15,788 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 19 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:15:15,788 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 107 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:15:15,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-11-23 03:15:15,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 171. [2021-11-23 03:15:15,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 127 states have (on average 1.31496062992126) internal successors, (167), 129 states have internal predecessors, (167), 32 states have call successors, (32), 12 states have call predecessors, (32), 11 states have return successors, (31), 29 states have call predecessors, (31), 31 states have call successors, (31) [2021-11-23 03:15:15,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 230 transitions. [2021-11-23 03:15:15,817 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 230 transitions. Word has length 38 [2021-11-23 03:15:15,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:15:15,817 INFO L470 AbstractCegarLoop]: Abstraction has 171 states and 230 transitions. [2021-11-23 03:15:15,818 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-23 03:15:15,818 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 230 transitions. [2021-11-23 03:15:15,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-23 03:15:15,819 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:15:15,819 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:15:15,865 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 03:15:16,041 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:15:16,042 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:15:16,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:15:16,042 INFO L85 PathProgramCache]: Analyzing trace with hash 419809677, now seen corresponding path program 1 times [2021-11-23 03:15:16,042 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:15:16,043 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [172087756] [2021-11-23 03:15:16,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:16,043 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:15:16,059 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:15:16,060 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1843839425] [2021-11-23 03:15:16,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:16,061 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:15:16,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:15:16,062 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:15:16,092 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 03:15:16,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:15:16,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 03:15:16,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:15:16,245 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:15:16,245 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:15:16,369 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 03:15:16,369 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:15:16,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [172087756] [2021-11-23 03:15:16,370 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:15:16,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1843839425] [2021-11-23 03:15:16,370 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1843839425] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:15:16,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [68585422] [2021-11-23 03:15:16,373 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-23 03:15:16,373 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:15:16,374 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:15:16,374 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:15:16,374 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:15:20,255 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 97 for LOIs [2021-11-23 03:15:20,431 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-23 03:15:20,483 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:15:40,617 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3498#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:15:40,617 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:15:40,617 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:15:40,617 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 12 [2021-11-23 03:15:40,617 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [126194902] [2021-11-23 03:15:40,618 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:15:40,618 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-23 03:15:40,619 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:15:40,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-23 03:15:40,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=799, Unknown=0, NotChecked=0, Total=992 [2021-11-23 03:15:40,620 INFO L87 Difference]: Start difference. First operand 171 states and 230 transitions. Second operand has 12 states, 12 states have (on average 3.75) internal successors, (45), 12 states have internal predecessors, (45), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2021-11-23 03:15:40,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:15:40,927 INFO L93 Difference]: Finished difference Result 380 states and 527 transitions. [2021-11-23 03:15:40,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 03:15:40,928 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.75) internal successors, (45), 12 states have internal predecessors, (45), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) Word has length 40 [2021-11-23 03:15:40,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:15:40,933 INFO L225 Difference]: With dead ends: 380 [2021-11-23 03:15:40,934 INFO L226 Difference]: Without dead ends: 279 [2021-11-23 03:15:40,940 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 87 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 514 ImplicationChecksByTransitivity, 20.2s TimeCoverageRelationStatistics Valid=235, Invalid=1097, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 03:15:40,941 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 133 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 133 SdHoareTripleChecker+Valid, 245 SdHoareTripleChecker+Invalid, 169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:15:40,943 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [133 Valid, 245 Invalid, 169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 107 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:15:40,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2021-11-23 03:15:40,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 257. [2021-11-23 03:15:40,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 193 states have (on average 1.2953367875647668) internal successors, (250), 195 states have internal predecessors, (250), 48 states have call successors, (48), 16 states have call predecessors, (48), 15 states have return successors, (47), 45 states have call predecessors, (47), 47 states have call successors, (47) [2021-11-23 03:15:40,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 345 transitions. [2021-11-23 03:15:40,988 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 345 transitions. Word has length 40 [2021-11-23 03:15:40,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:15:40,992 INFO L470 AbstractCegarLoop]: Abstraction has 257 states and 345 transitions. [2021-11-23 03:15:40,992 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.75) internal successors, (45), 12 states have internal predecessors, (45), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2021-11-23 03:15:40,992 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 345 transitions. [2021-11-23 03:15:40,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-23 03:15:40,995 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:15:40,995 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:15:41,046 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 03:15:41,221 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-23 03:15:41,221 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:15:41,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:15:41,222 INFO L85 PathProgramCache]: Analyzing trace with hash -1579218988, now seen corresponding path program 1 times [2021-11-23 03:15:41,222 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:15:41,222 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [854312549] [2021-11-23 03:15:41,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:41,222 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:15:41,228 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:15:41,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1382650469] [2021-11-23 03:15:41,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:15:41,229 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:15:41,229 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:15:41,231 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:15:41,253 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 03:15:41,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:15:41,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 03:15:41,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:15:41,448 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 8 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:15:41,449 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:15:41,619 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 03:15:41,619 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:15:41,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [854312549] [2021-11-23 03:15:41,620 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:15:41,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1382650469] [2021-11-23 03:15:41,620 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1382650469] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:15:41,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [929054399] [2021-11-23 03:15:41,623 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-23 03:15:41,623 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:15:41,624 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:15:41,624 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:15:41,624 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:15:50,994 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 119 for LOIs [2021-11-23 03:15:51,009 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-23 03:15:51,059 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:16:07,247 WARN L227 SmtUtils]: Spent 5.57s on a formula simplification. DAG size of input: 113 DAG size of output: 103 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:16:15,187 WARN L227 SmtUtils]: Spent 7.16s on a formula simplification. DAG size of input: 116 DAG size of output: 105 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:16:22,513 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4684#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:16:22,513 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:16:22,513 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:16:22,514 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2021-11-23 03:16:22,514 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943790361] [2021-11-23 03:16:22,514 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:16:22,514 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 03:16:22,514 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:16:22,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 03:16:22,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=933, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 03:16:22,516 INFO L87 Difference]: Start difference. First operand 257 states and 345 transitions. Second operand has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 11 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) [2021-11-23 03:16:22,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:16:22,939 INFO L93 Difference]: Finished difference Result 410 states and 556 transitions. [2021-11-23 03:16:22,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 03:16:22,939 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 11 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) Word has length 46 [2021-11-23 03:16:22,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:16:22,943 INFO L225 Difference]: With dead ends: 410 [2021-11-23 03:16:22,944 INFO L226 Difference]: Without dead ends: 405 [2021-11-23 03:16:22,945 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 102 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 585 ImplicationChecksByTransitivity, 31.6s TimeCoverageRelationStatistics Valid=248, Invalid=1312, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 03:16:22,945 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 277 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 150 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 277 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 278 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 150 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:16:22,946 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [277 Valid, 225 Invalid, 278 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [150 Valid, 128 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 03:16:22,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 405 states. [2021-11-23 03:16:22,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 405 to 362. [2021-11-23 03:16:22,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 362 states, 270 states have (on average 1.288888888888889) internal successors, (348), 279 states have internal predecessors, (348), 72 states have call successors, (72), 20 states have call predecessors, (72), 19 states have return successors, (71), 62 states have call predecessors, (71), 71 states have call successors, (71) [2021-11-23 03:16:22,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 491 transitions. [2021-11-23 03:16:22,993 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 491 transitions. Word has length 46 [2021-11-23 03:16:22,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:16:22,994 INFO L470 AbstractCegarLoop]: Abstraction has 362 states and 491 transitions. [2021-11-23 03:16:22,994 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 11 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) [2021-11-23 03:16:22,994 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 491 transitions. [2021-11-23 03:16:22,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 03:16:22,996 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:16:22,996 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:16:23,041 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 03:16:23,221 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:16:23,222 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:16:23,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:16:23,222 INFO L85 PathProgramCache]: Analyzing trace with hash -1252121023, now seen corresponding path program 1 times [2021-11-23 03:16:23,222 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:16:23,222 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1537185394] [2021-11-23 03:16:23,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:16:23,223 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:16:23,244 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:16:23,245 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [483690033] [2021-11-23 03:16:23,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:16:23,245 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:16:23,245 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:16:23,256 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:16:23,288 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 03:16:23,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:16:23,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 03:16:23,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:16:23,629 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 23 proven. 4 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 03:16:23,629 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:16:24,145 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 23 proven. 4 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 03:16:24,145 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:16:24,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1537185394] [2021-11-23 03:16:24,146 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:16:24,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [483690033] [2021-11-23 03:16:24,146 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [483690033] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:16:24,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1906301288] [2021-11-23 03:16:24,150 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-23 03:16:24,150 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:16:24,151 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:16:24,151 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:16:24,152 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:16:33,219 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 125 for LOIs [2021-11-23 03:16:33,235 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-23 03:16:33,285 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:16:58,328 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6097#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:16:58,329 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:16:58,329 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:16:58,329 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2021-11-23 03:16:58,329 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [814354583] [2021-11-23 03:16:58,329 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:16:58,329 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-23 03:16:58,330 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:16:58,330 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-23 03:16:58,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=870, Unknown=1, NotChecked=0, Total=992 [2021-11-23 03:16:58,331 INFO L87 Difference]: Start difference. First operand 362 states and 491 transitions. Second operand has 12 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 9 states have internal predecessors, (31), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (9), 5 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:17:00,371 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 03:17:02,428 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 03:17:04,921 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 03:17:07,030 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 03:17:07,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:17:07,123 INFO L93 Difference]: Finished difference Result 584 states and 791 transitions. [2021-11-23 03:17:07,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 03:17:07,124 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 9 states have internal predecessors, (31), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (9), 5 states have call predecessors, (9), 3 states have call successors, (9) Word has length 52 [2021-11-23 03:17:07,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:17:07,128 INFO L225 Difference]: With dead ends: 584 [2021-11-23 03:17:07,128 INFO L226 Difference]: Without dead ends: 416 [2021-11-23 03:17:07,130 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 120 SyntacticMatches, 5 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 347 ImplicationChecksByTransitivity, 25.3s TimeCoverageRelationStatistics Valid=143, Invalid=1046, Unknown=1, NotChecked=0, Total=1190 [2021-11-23 03:17:07,131 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 65 mSDsluCounter, 155 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 30 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 184 SdHoareTripleChecker+Invalid, 194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.7s IncrementalHoareTripleChecker+Time [2021-11-23 03:17:07,132 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 184 Invalid, 194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 160 Invalid, 4 Unknown, 0 Unchecked, 8.7s Time] [2021-11-23 03:17:07,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 416 states. [2021-11-23 03:17:07,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 416 to 368. [2021-11-23 03:17:07,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 368 states, 276 states have (on average 1.213768115942029) internal successors, (335), 285 states have internal predecessors, (335), 65 states have call successors, (65), 27 states have call predecessors, (65), 26 states have return successors, (64), 55 states have call predecessors, (64), 64 states have call successors, (64) [2021-11-23 03:17:07,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 464 transitions. [2021-11-23 03:17:07,185 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 464 transitions. Word has length 52 [2021-11-23 03:17:07,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:17:07,186 INFO L470 AbstractCegarLoop]: Abstraction has 368 states and 464 transitions. [2021-11-23 03:17:07,186 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 9 states have internal predecessors, (31), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (9), 5 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:17:07,186 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 464 transitions. [2021-11-23 03:17:07,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 03:17:07,189 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:17:07,189 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:17:07,217 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 03:17:07,397 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-23 03:17:07,398 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:17:07,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:17:07,398 INFO L85 PathProgramCache]: Analyzing trace with hash -703296414, now seen corresponding path program 1 times [2021-11-23 03:17:07,399 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:17:07,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1978911459] [2021-11-23 03:17:07,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:17:07,399 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:17:07,407 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:17:07,407 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [727269213] [2021-11-23 03:17:07,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:17:07,408 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:17:07,408 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:17:07,413 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:17:07,441 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 03:17:07,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:17:07,513 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 03:17:07,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:17:07,698 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 64 proven. 12 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2021-11-23 03:17:07,699 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:17:07,910 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 38 proven. 12 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2021-11-23 03:17:07,910 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:17:07,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1978911459] [2021-11-23 03:17:07,911 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:17:07,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [727269213] [2021-11-23 03:17:07,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [727269213] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:17:07,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1165484423] [2021-11-23 03:17:07,917 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-23 03:17:07,917 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:17:07,918 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:17:07,918 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:17:07,918 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:17:13,030 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2021-11-23 03:17:13,040 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-23 03:17:13,087 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:17:15,888 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7926#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:17:15,888 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:17:15,889 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:17:15,889 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2021-11-23 03:17:15,889 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287907217] [2021-11-23 03:17:15,889 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:17:15,889 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:17:15,890 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:17:15,890 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:17:15,890 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=420, Unknown=0, NotChecked=0, Total=506 [2021-11-23 03:17:15,891 INFO L87 Difference]: Start difference. First operand 368 states and 464 transitions. Second operand has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 03:17:15,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:17:15,967 INFO L93 Difference]: Finished difference Result 603 states and 789 transitions. [2021-11-23 03:17:15,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:17:15,967 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 82 [2021-11-23 03:17:15,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:17:15,971 INFO L225 Difference]: With dead ends: 603 [2021-11-23 03:17:15,972 INFO L226 Difference]: Without dead ends: 444 [2021-11-23 03:17:15,973 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 220 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=90, Invalid=462, Unknown=0, NotChecked=0, Total=552 [2021-11-23 03:17:15,974 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 19 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:17:15,974 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 129 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:17:15,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 444 states. [2021-11-23 03:17:16,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 444 to 433. [2021-11-23 03:17:16,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 433 states, 324 states have (on average 1.2314814814814814) internal successors, (399), 338 states have internal predecessors, (399), 82 states have call successors, (82), 27 states have call predecessors, (82), 26 states have return successors, (81), 67 states have call predecessors, (81), 81 states have call successors, (81) [2021-11-23 03:17:16,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 433 states to 433 states and 562 transitions. [2021-11-23 03:17:16,027 INFO L78 Accepts]: Start accepts. Automaton has 433 states and 562 transitions. Word has length 82 [2021-11-23 03:17:16,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:17:16,028 INFO L470 AbstractCegarLoop]: Abstraction has 433 states and 562 transitions. [2021-11-23 03:17:16,028 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 03:17:16,028 INFO L276 IsEmpty]: Start isEmpty. Operand 433 states and 562 transitions. [2021-11-23 03:17:16,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 03:17:16,031 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:17:16,032 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:17:16,069 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 03:17:16,245 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:17:16,246 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:17:16,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:17:16,246 INFO L85 PathProgramCache]: Analyzing trace with hash -1378770924, now seen corresponding path program 2 times [2021-11-23 03:17:16,246 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:17:16,246 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1867444362] [2021-11-23 03:17:16,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:17:16,247 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:17:16,255 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:17:16,255 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [389329780] [2021-11-23 03:17:16,255 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:17:16,255 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:17:16,256 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:17:16,273 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:17:16,280 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 03:17:16,414 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 03:17:16,414 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:17:16,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 03:17:16,418 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:17:16,531 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2021-11-23 03:17:16,531 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:17:16,531 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:17:16,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1867444362] [2021-11-23 03:17:16,532 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:17:16,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [389329780] [2021-11-23 03:17:16,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [389329780] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:17:16,532 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:17:16,532 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 03:17:16,533 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [373062154] [2021-11-23 03:17:16,533 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:17:16,534 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:17:16,534 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:17:16,534 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:17:16,535 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:17:16,535 INFO L87 Difference]: Start difference. First operand 433 states and 562 transitions. Second operand has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-23 03:17:16,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:17:16,634 INFO L93 Difference]: Finished difference Result 710 states and 940 transitions. [2021-11-23 03:17:16,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:17:16,634 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 82 [2021-11-23 03:17:16,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:17:16,638 INFO L225 Difference]: With dead ends: 710 [2021-11-23 03:17:16,639 INFO L226 Difference]: Without dead ends: 520 [2021-11-23 03:17:16,640 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:17:16,640 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 15 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:17:16,641 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 133 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:17:16,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 520 states. [2021-11-23 03:17:16,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 520 to 468. [2021-11-23 03:17:16,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 468 states, 357 states have (on average 1.2128851540616246) internal successors, (433), 364 states have internal predecessors, (433), 82 states have call successors, (82), 29 states have call predecessors, (82), 28 states have return successors, (81), 74 states have call predecessors, (81), 81 states have call successors, (81) [2021-11-23 03:17:16,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 596 transitions. [2021-11-23 03:17:16,693 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 596 transitions. Word has length 82 [2021-11-23 03:17:16,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:17:16,694 INFO L470 AbstractCegarLoop]: Abstraction has 468 states and 596 transitions. [2021-11-23 03:17:16,694 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-23 03:17:16,694 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 596 transitions. [2021-11-23 03:17:16,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 03:17:16,696 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:17:16,697 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:17:16,737 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-23 03:17:16,921 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:17:16,922 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:17:16,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:17:16,922 INFO L85 PathProgramCache]: Analyzing trace with hash -760314426, now seen corresponding path program 3 times [2021-11-23 03:17:16,922 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:17:16,923 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [207509948] [2021-11-23 03:17:16,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:17:16,923 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:17:16,928 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:17:16,929 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [720165912] [2021-11-23 03:17:16,929 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:17:16,929 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:17:16,929 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:17:16,930 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:17:16,932 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 03:17:16,991 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:17:16,991 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:17:16,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 03:17:16,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:17:17,208 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 24 proven. 152 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:17:17,208 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:17:17,504 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 24 proven. 40 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2021-11-23 03:17:17,504 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:17:17,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [207509948] [2021-11-23 03:17:17,505 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:17:17,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [720165912] [2021-11-23 03:17:17,505 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [720165912] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:17:17,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [291932820] [2021-11-23 03:17:17,507 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-23 03:17:17,507 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:17:17,507 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:17:17,508 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:17:17,508 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:17:24,100 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2021-11-23 03:17:24,120 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-23 03:17:24,157 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:17:26,014 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11774#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:17:26,014 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:17:26,014 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:17:26,015 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12] total 22 [2021-11-23 03:17:26,015 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1717440942] [2021-11-23 03:17:26,015 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:17:26,015 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 03:17:26,015 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:17:26,016 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 03:17:26,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=366, Invalid=1274, Unknown=0, NotChecked=0, Total=1640 [2021-11-23 03:17:26,017 INFO L87 Difference]: Start difference. First operand 468 states and 596 transitions. Second operand has 22 states, 22 states have (on average 4.181818181818182) internal successors, (92), 22 states have internal predecessors, (92), 19 states have call successors, (21), 11 states have call predecessors, (21), 10 states have return successors, (20), 18 states have call predecessors, (20), 18 states have call successors, (20) [2021-11-23 03:17:26,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:17:26,894 INFO L93 Difference]: Finished difference Result 1361 states and 1859 transitions. [2021-11-23 03:17:26,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-23 03:17:26,895 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 4.181818181818182) internal successors, (92), 22 states have internal predecessors, (92), 19 states have call successors, (21), 11 states have call predecessors, (21), 10 states have return successors, (20), 18 states have call predecessors, (20), 18 states have call successors, (20) Word has length 82 [2021-11-23 03:17:26,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:17:26,904 INFO L225 Difference]: With dead ends: 1361 [2021-11-23 03:17:26,904 INFO L226 Difference]: Without dead ends: 1265 [2021-11-23 03:17:26,906 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 201 SyntacticMatches, 4 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1237 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=678, Invalid=2514, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 03:17:26,907 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 412 mSDsluCounter, 387 mSDsCounter, 0 mSdLazyCounter, 335 mSolverCounterSat, 204 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 412 SdHoareTripleChecker+Valid, 457 SdHoareTripleChecker+Invalid, 539 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 204 IncrementalHoareTripleChecker+Valid, 335 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:17:26,907 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [412 Valid, 457 Invalid, 539 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [204 Valid, 335 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:17:26,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1265 states. [2021-11-23 03:17:27,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1265 to 1205. [2021-11-23 03:17:27,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1205 states, 911 states have (on average 1.2294182217343579) internal successors, (1120), 921 states have internal predecessors, (1120), 240 states have call successors, (240), 54 states have call predecessors, (240), 53 states have return successors, (239), 229 states have call predecessors, (239), 239 states have call successors, (239) [2021-11-23 03:17:27,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1205 states to 1205 states and 1599 transitions. [2021-11-23 03:17:27,056 INFO L78 Accepts]: Start accepts. Automaton has 1205 states and 1599 transitions. Word has length 82 [2021-11-23 03:17:27,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:17:27,057 INFO L470 AbstractCegarLoop]: Abstraction has 1205 states and 1599 transitions. [2021-11-23 03:17:27,057 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 4.181818181818182) internal successors, (92), 22 states have internal predecessors, (92), 19 states have call successors, (21), 11 states have call predecessors, (21), 10 states have return successors, (20), 18 states have call predecessors, (20), 18 states have call successors, (20) [2021-11-23 03:17:27,057 INFO L276 IsEmpty]: Start isEmpty. Operand 1205 states and 1599 transitions. [2021-11-23 03:17:27,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-23 03:17:27,060 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:17:27,060 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:17:27,096 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-23 03:17:27,273 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-23 03:17:27,274 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:17:27,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:17:27,274 INFO L85 PathProgramCache]: Analyzing trace with hash -1887960563, now seen corresponding path program 1 times [2021-11-23 03:17:27,274 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:17:27,275 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [968473496] [2021-11-23 03:17:27,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:17:27,275 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:17:27,282 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:17:27,282 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1700405437] [2021-11-23 03:17:27,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:17:27,283 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:17:27,283 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:17:27,284 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:17:27,286 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 03:17:27,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:17:27,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 03:17:27,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:17:27,563 INFO L134 CoverageAnalysis]: Checked inductivity of 214 backedges. 22 proven. 190 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:17:27,563 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:17:27,849 INFO L134 CoverageAnalysis]: Checked inductivity of 214 backedges. 22 proven. 46 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2021-11-23 03:17:27,849 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:17:27,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [968473496] [2021-11-23 03:17:27,850 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:17:27,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1700405437] [2021-11-23 03:17:27,850 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1700405437] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:17:27,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1197980285] [2021-11-23 03:17:27,852 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-23 03:17:27,853 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:17:27,853 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:17:27,853 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:17:27,853 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:17:35,057 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 124 for LOIs [2021-11-23 03:17:36,151 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-23 03:17:36,183 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:17:45,424 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15966#(and (<= 2 ~counter~0) (<= 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|) (<= ~counter~0 53))' at error location [2021-11-23 03:17:45,424 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:17:45,424 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:17:45,424 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 24 [2021-11-23 03:17:45,424 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1043989964] [2021-11-23 03:17:45,425 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:17:45,425 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-23 03:17:45,425 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:17:45,426 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-23 03:17:45,427 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=1484, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 03:17:45,427 INFO L87 Difference]: Start difference. First operand 1205 states and 1599 transitions. Second operand has 24 states, 24 states have (on average 4.125) internal successors, (99), 24 states have internal predecessors, (99), 21 states have call successors, (23), 12 states have call predecessors, (23), 11 states have return successors, (22), 20 states have call predecessors, (22), 20 states have call successors, (22) [2021-11-23 03:17:46,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:17:46,357 INFO L93 Difference]: Finished difference Result 1806 states and 2368 transitions. [2021-11-23 03:17:46,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-23 03:17:46,358 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 4.125) internal successors, (99), 24 states have internal predecessors, (99), 21 states have call successors, (23), 12 states have call predecessors, (23), 11 states have return successors, (22), 20 states have call predecessors, (22), 20 states have call successors, (22) Word has length 88 [2021-11-23 03:17:46,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:17:46,365 INFO L225 Difference]: With dead ends: 1806 [2021-11-23 03:17:46,365 INFO L226 Difference]: Without dead ends: 1001 [2021-11-23 03:17:46,369 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 217 SyntacticMatches, 3 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1345 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=756, Invalid=2904, Unknown=0, NotChecked=0, Total=3660 [2021-11-23 03:17:46,370 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 507 mSDsluCounter, 325 mSDsCounter, 0 mSdLazyCounter, 284 mSolverCounterSat, 294 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 507 SdHoareTripleChecker+Valid, 402 SdHoareTripleChecker+Invalid, 578 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 294 IncrementalHoareTripleChecker+Valid, 284 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:17:46,371 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [507 Valid, 402 Invalid, 578 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [294 Valid, 284 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 03:17:46,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1001 states. [2021-11-23 03:17:46,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1001 to 945. [2021-11-23 03:17:46,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 945 states, 711 states have (on average 1.1786216596343178) internal successors, (838), 717 states have internal predecessors, (838), 174 states have call successors, (174), 60 states have call predecessors, (174), 59 states have return successors, (173), 167 states have call predecessors, (173), 173 states have call successors, (173) [2021-11-23 03:17:46,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 945 states to 945 states and 1185 transitions. [2021-11-23 03:17:46,469 INFO L78 Accepts]: Start accepts. Automaton has 945 states and 1185 transitions. Word has length 88 [2021-11-23 03:17:46,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:17:46,470 INFO L470 AbstractCegarLoop]: Abstraction has 945 states and 1185 transitions. [2021-11-23 03:17:46,470 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 4.125) internal successors, (99), 24 states have internal predecessors, (99), 21 states have call successors, (23), 12 states have call predecessors, (23), 11 states have return successors, (22), 20 states have call predecessors, (22), 20 states have call successors, (22) [2021-11-23 03:17:46,471 INFO L276 IsEmpty]: Start isEmpty. Operand 945 states and 1185 transitions. [2021-11-23 03:17:46,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 03:17:46,474 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:17:46,474 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:17:46,511 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-23 03:17:46,689 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-23 03:17:46,690 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:17:46,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:17:46,690 INFO L85 PathProgramCache]: Analyzing trace with hash -890970028, now seen corresponding path program 1 times [2021-11-23 03:17:46,690 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:17:46,690 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [686512642] [2021-11-23 03:17:46,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:17:46,690 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:17:46,695 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:17:46,695 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [64174351] [2021-11-23 03:17:46,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:17:46,696 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:17:46,696 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:17:46,697 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:17:46,712 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-23 03:17:46,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:17:46,764 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 03:17:46,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:17:46,992 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 20 proven. 236 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:17:46,992 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:17:47,317 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 20 proven. 56 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2021-11-23 03:17:47,318 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:17:47,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [686512642] [2021-11-23 03:17:47,318 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:17:47,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [64174351] [2021-11-23 03:17:47,318 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [64174351] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:17:47,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1917963662] [2021-11-23 03:17:47,320 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-23 03:17:47,320 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:17:47,320 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:17:47,321 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:17:47,321 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:17:53,098 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 127 for LOIs [2021-11-23 03:17:53,937 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-23 03:17:53,970 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:18:02,732 WARN L227 SmtUtils]: Spent 8.07s on a formula simplification. DAG size of input: 109 DAG size of output: 101 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:18:06,627 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20422#(and (<= ~counter~0 52) (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:18:06,628 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:18:06,628 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:18:06,628 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 26 [2021-11-23 03:18:06,628 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2023135088] [2021-11-23 03:18:06,628 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:18:06,628 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-23 03:18:06,629 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:18:06,629 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-23 03:18:06,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=457, Invalid=1523, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 03:18:06,630 INFO L87 Difference]: Start difference. First operand 945 states and 1185 transitions. Second operand has 26 states, 26 states have (on average 4.076923076923077) internal successors, (106), 26 states have internal predecessors, (106), 23 states have call successors, (25), 13 states have call predecessors, (25), 12 states have return successors, (24), 22 states have call predecessors, (24), 22 states have call successors, (24) [2021-11-23 03:18:07,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:18:07,645 INFO L93 Difference]: Finished difference Result 1077 states and 1359 transitions. [2021-11-23 03:18:07,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-23 03:18:07,646 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 4.076923076923077) internal successors, (106), 26 states have internal predecessors, (106), 23 states have call successors, (25), 13 states have call predecessors, (25), 12 states have return successors, (24), 22 states have call predecessors, (24), 22 states have call successors, (24) Word has length 94 [2021-11-23 03:18:07,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:18:07,653 INFO L225 Difference]: With dead ends: 1077 [2021-11-23 03:18:07,653 INFO L226 Difference]: Without dead ends: 1072 [2021-11-23 03:18:07,656 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 231 SyntacticMatches, 6 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1522 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=846, Invalid=3060, Unknown=0, NotChecked=0, Total=3906 [2021-11-23 03:18:07,657 INFO L933 BasicCegarLoop]: 84 mSDtfsCounter, 553 mSDsluCounter, 410 mSDsCounter, 0 mSdLazyCounter, 329 mSolverCounterSat, 351 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 553 SdHoareTripleChecker+Valid, 492 SdHoareTripleChecker+Invalid, 680 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 351 IncrementalHoareTripleChecker+Valid, 329 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:18:07,658 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [553 Valid, 492 Invalid, 680 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [351 Valid, 329 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 03:18:07,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1072 states. [2021-11-23 03:18:07,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1072 to 1044. [2021-11-23 03:18:07,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1044 states, 789 states have (on average 1.1571609632446134) internal successors, (913), 796 states have internal predecessors, (913), 190 states have call successors, (190), 65 states have call predecessors, (190), 64 states have return successors, (189), 182 states have call predecessors, (189), 189 states have call successors, (189) [2021-11-23 03:18:07,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1044 states to 1044 states and 1292 transitions. [2021-11-23 03:18:07,759 INFO L78 Accepts]: Start accepts. Automaton has 1044 states and 1292 transitions. Word has length 94 [2021-11-23 03:18:07,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:18:07,760 INFO L470 AbstractCegarLoop]: Abstraction has 1044 states and 1292 transitions. [2021-11-23 03:18:07,760 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 4.076923076923077) internal successors, (106), 26 states have internal predecessors, (106), 23 states have call successors, (25), 13 states have call predecessors, (25), 12 states have return successors, (24), 22 states have call predecessors, (24), 22 states have call successors, (24) [2021-11-23 03:18:07,760 INFO L276 IsEmpty]: Start isEmpty. Operand 1044 states and 1292 transitions. [2021-11-23 03:18:07,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2021-11-23 03:18:07,770 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:18:07,770 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 11, 10, 10, 10, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:18:07,805 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-23 03:18:07,985 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:18:07,986 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:18:07,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:18:07,986 INFO L85 PathProgramCache]: Analyzing trace with hash -1384815896, now seen corresponding path program 4 times [2021-11-23 03:18:07,987 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:18:07,987 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [434443472] [2021-11-23 03:18:07,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:18:07,987 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:18:07,999 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:18:07,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1362105193] [2021-11-23 03:18:07,999 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:18:08,000 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:18:08,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:18:08,001 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:18:08,017 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-23 03:18:08,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:18:08,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 405 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:18:08,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:18:08,324 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 612 proven. 0 refuted. 0 times theorem prover too weak. 490 trivial. 0 not checked. [2021-11-23 03:18:08,324 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:18:08,324 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:18:08,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [434443472] [2021-11-23 03:18:08,325 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:18:08,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1362105193] [2021-11-23 03:18:08,325 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1362105193] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:18:08,325 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:18:08,325 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:18:08,325 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1340031209] [2021-11-23 03:18:08,325 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:18:08,325 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:18:08,326 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:18:08,326 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:18:08,326 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:18:08,326 INFO L87 Difference]: Start difference. First operand 1044 states and 1292 transitions. Second operand has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 3 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 03:18:08,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:18:08,430 INFO L93 Difference]: Finished difference Result 1699 states and 2123 transitions. [2021-11-23 03:18:08,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:18:08,430 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 3 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 178 [2021-11-23 03:18:08,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:18:08,438 INFO L225 Difference]: With dead ends: 1699 [2021-11-23 03:18:08,439 INFO L226 Difference]: Without dead ends: 1104 [2021-11-23 03:18:08,441 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 176 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:18:08,442 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 3 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:18:08,442 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 68 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:18:08,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1104 states. [2021-11-23 03:18:08,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1104 to 1061. [2021-11-23 03:18:08,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1061 states, 802 states have (on average 1.1458852867830425) internal successors, (919), 822 states have internal predecessors, (919), 195 states have call successors, (195), 64 states have call predecessors, (195), 63 states have return successors, (194), 174 states have call predecessors, (194), 194 states have call successors, (194) [2021-11-23 03:18:08,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1061 states to 1061 states and 1308 transitions. [2021-11-23 03:18:08,544 INFO L78 Accepts]: Start accepts. Automaton has 1061 states and 1308 transitions. Word has length 178 [2021-11-23 03:18:08,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:18:08,544 INFO L470 AbstractCegarLoop]: Abstraction has 1061 states and 1308 transitions. [2021-11-23 03:18:08,544 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 3 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 03:18:08,545 INFO L276 IsEmpty]: Start isEmpty. Operand 1061 states and 1308 transitions. [2021-11-23 03:18:08,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2021-11-23 03:18:08,550 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:18:08,552 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 9, 8, 8, 8, 8, 7, 7, 7, 6, 5, 5, 5, 5, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:18:08,590 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-23 03:18:08,768 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-23 03:18:08,769 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:18:08,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:18:08,769 INFO L85 PathProgramCache]: Analyzing trace with hash 437435780, now seen corresponding path program 5 times [2021-11-23 03:18:08,769 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:18:08,770 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1678383510] [2021-11-23 03:18:08,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:18:08,770 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:18:08,776 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:18:08,776 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2016163105] [2021-11-23 03:18:08,776 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:18:08,776 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:18:08,777 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:18:08,779 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:18:08,801 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 03:18:08,954 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 03:18:08,955 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:18:08,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:18:08,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:18:09,180 INFO L134 CoverageAnalysis]: Checked inductivity of 1078 backedges. 120 proven. 0 refuted. 0 times theorem prover too weak. 958 trivial. 0 not checked. [2021-11-23 03:18:09,180 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:18:09,181 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:18:09,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1678383510] [2021-11-23 03:18:09,181 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:18:09,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2016163105] [2021-11-23 03:18:09,181 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2016163105] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:18:09,181 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:18:09,182 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:18:09,182 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1386897658] [2021-11-23 03:18:09,182 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:18:09,182 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:18:09,183 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:18:09,183 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:18:09,183 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:18:09,183 INFO L87 Difference]: Start difference. First operand 1061 states and 1308 transitions. Second operand has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-23 03:18:09,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:18:09,294 INFO L93 Difference]: Finished difference Result 1073 states and 1318 transitions. [2021-11-23 03:18:09,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:18:09,295 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 178 [2021-11-23 03:18:09,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:18:09,302 INFO L225 Difference]: With dead ends: 1073 [2021-11-23 03:18:09,303 INFO L226 Difference]: Without dead ends: 1022 [2021-11-23 03:18:09,304 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 175 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:18:09,304 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 12 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:18:09,305 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 84 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:18:09,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1022 states. [2021-11-23 03:18:09,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1022 to 1016. [2021-11-23 03:18:09,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1016 states, 766 states have (on average 1.139686684073107) internal successors, (873), 787 states have internal predecessors, (873), 186 states have call successors, (186), 64 states have call predecessors, (186), 63 states have return successors, (185), 164 states have call predecessors, (185), 185 states have call successors, (185) [2021-11-23 03:18:09,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1016 states to 1016 states and 1244 transitions. [2021-11-23 03:18:09,400 INFO L78 Accepts]: Start accepts. Automaton has 1016 states and 1244 transitions. Word has length 178 [2021-11-23 03:18:09,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:18:09,400 INFO L470 AbstractCegarLoop]: Abstraction has 1016 states and 1244 transitions. [2021-11-23 03:18:09,401 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-23 03:18:09,401 INFO L276 IsEmpty]: Start isEmpty. Operand 1016 states and 1244 transitions. [2021-11-23 03:18:09,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2021-11-23 03:18:09,406 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:18:09,406 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 11, 10, 10, 10, 7, 7, 6, 6, 6, 5, 4, 4, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:18:09,417 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-23 03:18:09,611 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:18:09,612 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:18:09,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:18:09,612 INFO L85 PathProgramCache]: Analyzing trace with hash -223810874, now seen corresponding path program 6 times [2021-11-23 03:18:09,613 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:18:09,613 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1252991301] [2021-11-23 03:18:09,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:18:09,613 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:18:09,634 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:18:09,635 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1952677461] [2021-11-23 03:18:09,635 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:18:09,635 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:18:09,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:18:09,636 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:18:09,645 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-23 03:18:09,721 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:18:09,722 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:18:09,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 03:18:09,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:18:10,043 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 280 proven. 184 refuted. 0 times theorem prover too weak. 642 trivial. 0 not checked. [2021-11-23 03:18:10,044 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:18:10,450 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 140 proven. 184 refuted. 0 times theorem prover too weak. 782 trivial. 0 not checked. [2021-11-23 03:18:10,450 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:18:10,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1252991301] [2021-11-23 03:18:10,451 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:18:10,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1952677461] [2021-11-23 03:18:10,451 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1952677461] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:18:10,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1824830358] [2021-11-23 03:18:10,453 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-23 03:18:10,453 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:18:10,453 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:18:10,454 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:18:10,454 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:18:14,409 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 49 for LOIs [2021-11-23 03:18:14,417 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-23 03:18:14,449 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:18:23,294 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32238#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:18:23,294 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:18:23,295 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:18:23,295 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2021-11-23 03:18:23,295 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886666461] [2021-11-23 03:18:23,295 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:18:23,296 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 03:18:23,296 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:18:23,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 03:18:23,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=712, Unknown=0, NotChecked=0, Total=812 [2021-11-23 03:18:23,297 INFO L87 Difference]: Start difference. First operand 1016 states and 1244 transitions. Second operand has 10 states, 10 states have (on average 7.3) internal successors, (73), 10 states have internal predecessors, (73), 10 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 10 states have call predecessors, (21), 10 states have call successors, (21) [2021-11-23 03:18:24,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:18:24,059 INFO L93 Difference]: Finished difference Result 2038 states and 2635 transitions. [2021-11-23 03:18:24,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 03:18:24,059 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 7.3) internal successors, (73), 10 states have internal predecessors, (73), 10 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 10 states have call predecessors, (21), 10 states have call successors, (21) Word has length 178 [2021-11-23 03:18:24,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:18:24,072 INFO L225 Difference]: With dead ends: 2038 [2021-11-23 03:18:24,072 INFO L226 Difference]: Without dead ends: 1783 [2021-11-23 03:18:24,075 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 546 GetRequests, 493 SyntacticMatches, 12 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 530 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=190, Invalid=1616, Unknown=0, NotChecked=0, Total=1806 [2021-11-23 03:18:24,076 INFO L933 BasicCegarLoop]: 216 mSDtfsCounter, 112 mSDsluCounter, 1132 mSDsCounter, 0 mSdLazyCounter, 516 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 1340 SdHoareTripleChecker+Invalid, 564 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 516 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:18:24,076 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [116 Valid, 1340 Invalid, 564 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 516 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:18:24,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1783 states. [2021-11-23 03:18:24,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1783 to 1560. [2021-11-23 03:18:24,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1560 states, 1181 states have (on average 1.165961049957663) internal successors, (1377), 1200 states have internal predecessors, (1377), 315 states have call successors, (315), 64 states have call predecessors, (315), 63 states have return successors, (314), 295 states have call predecessors, (314), 314 states have call successors, (314) [2021-11-23 03:18:24,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1560 states to 1560 states and 2006 transitions. [2021-11-23 03:18:24,254 INFO L78 Accepts]: Start accepts. Automaton has 1560 states and 2006 transitions. Word has length 178 [2021-11-23 03:18:24,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:18:24,254 INFO L470 AbstractCegarLoop]: Abstraction has 1560 states and 2006 transitions. [2021-11-23 03:18:24,255 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 7.3) internal successors, (73), 10 states have internal predecessors, (73), 10 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 10 states have call predecessors, (21), 10 states have call successors, (21) [2021-11-23 03:18:24,255 INFO L276 IsEmpty]: Start isEmpty. Operand 1560 states and 2006 transitions. [2021-11-23 03:18:24,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2021-11-23 03:18:24,262 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:18:24,262 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 10, 9, 9, 9, 8, 7, 7, 7, 6, 5, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:18:24,297 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-23 03:18:24,481 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:18:24,482 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:18:24,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:18:24,482 INFO L85 PathProgramCache]: Analyzing trace with hash -654614764, now seen corresponding path program 7 times [2021-11-23 03:18:24,482 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:18:24,482 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [561408853] [2021-11-23 03:18:24,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:18:24,483 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:18:24,491 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:18:24,491 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [318270694] [2021-11-23 03:18:24,492 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:18:24,492 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:18:24,492 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:18:24,493 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:18:24,494 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-23 03:18:24,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:18:24,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 03:18:24,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:18:24,933 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 516 proven. 84 refuted. 0 times theorem prover too weak. 494 trivial. 0 not checked. [2021-11-23 03:18:24,933 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:18:25,323 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 226 proven. 84 refuted. 0 times theorem prover too weak. 784 trivial. 0 not checked. [2021-11-23 03:18:25,323 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:18:25,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [561408853] [2021-11-23 03:18:25,324 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:18:25,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [318270694] [2021-11-23 03:18:25,324 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [318270694] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:18:25,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [310346223] [2021-11-23 03:18:25,326 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-23 03:18:25,327 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:18:25,327 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:18:25,327 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:18:25,327 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:18:29,267 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2021-11-23 03:18:29,276 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-23 03:18:29,310 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:18:32,229 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38361#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:18:32,229 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:18:32,230 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:18:32,230 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2021-11-23 03:18:32,230 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074654702] [2021-11-23 03:18:32,230 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:18:32,231 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 03:18:32,231 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:18:32,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 03:18:32,232 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=940, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 03:18:32,232 INFO L87 Difference]: Start difference. First operand 1560 states and 2006 transitions. Second operand has 14 states, 14 states have (on average 7.5) internal successors, (105), 14 states have internal predecessors, (105), 14 states have call successors, (36), 2 states have call predecessors, (36), 2 states have return successors, (35), 14 states have call predecessors, (35), 14 states have call successors, (35) [2021-11-23 03:18:33,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:18:33,755 INFO L93 Difference]: Finished difference Result 3206 states and 4266 transitions. [2021-11-23 03:18:33,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 03:18:33,756 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 7.5) internal successors, (105), 14 states have internal predecessors, (105), 14 states have call successors, (36), 2 states have call predecessors, (36), 2 states have return successors, (35), 14 states have call predecessors, (35), 14 states have call successors, (35) Word has length 178 [2021-11-23 03:18:33,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:18:33,776 INFO L225 Difference]: With dead ends: 3206 [2021-11-23 03:18:33,776 INFO L226 Difference]: Without dead ends: 2843 [2021-11-23 03:18:33,780 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 580 GetRequests, 516 SyntacticMatches, 9 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 920 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=448, Invalid=2744, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 03:18:33,781 INFO L933 BasicCegarLoop]: 164 mSDtfsCounter, 244 mSDsluCounter, 745 mSDsCounter, 0 mSdLazyCounter, 531 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 249 SdHoareTripleChecker+Valid, 902 SdHoareTripleChecker+Invalid, 653 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 531 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:18:33,781 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [249 Valid, 902 Invalid, 653 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 531 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 03:18:33,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2843 states. [2021-11-23 03:18:34,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2843 to 2207. [2021-11-23 03:18:34,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2207 states, 1666 states have (on average 1.1596638655462186) internal successors, (1932), 1694 states have internal predecessors, (1932), 477 states have call successors, (477), 64 states have call predecessors, (477), 63 states have return successors, (476), 448 states have call predecessors, (476), 476 states have call successors, (476) [2021-11-23 03:18:34,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2207 states to 2207 states and 2885 transitions. [2021-11-23 03:18:34,095 INFO L78 Accepts]: Start accepts. Automaton has 2207 states and 2885 transitions. Word has length 178 [2021-11-23 03:18:34,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:18:34,095 INFO L470 AbstractCegarLoop]: Abstraction has 2207 states and 2885 transitions. [2021-11-23 03:18:34,096 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 7.5) internal successors, (105), 14 states have internal predecessors, (105), 14 states have call successors, (36), 2 states have call predecessors, (36), 2 states have return successors, (35), 14 states have call predecessors, (35), 14 states have call successors, (35) [2021-11-23 03:18:34,096 INFO L276 IsEmpty]: Start isEmpty. Operand 2207 states and 2885 transitions. [2021-11-23 03:18:34,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2021-11-23 03:18:34,106 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:18:34,107 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 11, 10, 10, 10, 7, 7, 6, 6, 6, 5, 4, 4, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:18:34,142 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-23 03:18:34,321 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-23 03:18:34,322 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:18:34,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:18:34,322 INFO L85 PathProgramCache]: Analyzing trace with hash 1253226182, now seen corresponding path program 8 times [2021-11-23 03:18:34,322 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:18:34,322 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [947568676] [2021-11-23 03:18:34,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:18:34,323 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:18:34,329 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:18:34,334 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [645584689] [2021-11-23 03:18:34,335 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:18:34,335 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:18:34,335 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:18:34,336 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:18:34,357 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-23 03:18:35,589 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-23 03:18:35,589 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:18:35,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 03:18:35,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:18:35,933 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 80 proven. 252 refuted. 0 times theorem prover too weak. 774 trivial. 0 not checked. [2021-11-23 03:18:35,933 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:18:36,373 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 80 proven. 252 refuted. 0 times theorem prover too weak. 774 trivial. 0 not checked. [2021-11-23 03:18:36,373 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:18:36,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [947568676] [2021-11-23 03:18:36,373 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:18:36,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [645584689] [2021-11-23 03:18:36,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [645584689] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:18:36,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [574714764] [2021-11-23 03:18:36,375 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-23 03:18:36,376 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:18:36,376 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:18:36,376 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:18:36,377 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:18:39,945 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2021-11-23 03:18:39,954 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-23 03:18:39,987 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:18:45,047 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '47088#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:18:45,048 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:18:45,048 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:18:45,048 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2021-11-23 03:18:45,048 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966204608] [2021-11-23 03:18:45,048 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:18:45,049 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 03:18:45,049 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:18:45,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 03:18:45,050 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1351, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 03:18:45,051 INFO L87 Difference]: Start difference. First operand 2207 states and 2885 transitions. Second operand has 20 states, 20 states have (on average 6.1) internal successors, (122), 20 states have internal predecessors, (122), 20 states have call successors, (37), 2 states have call predecessors, (37), 1 states have return successors, (36), 19 states have call predecessors, (36), 19 states have call successors, (36) [2021-11-23 03:18:49,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:18:49,673 INFO L93 Difference]: Finished difference Result 6069 states and 8307 transitions. [2021-11-23 03:18:49,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-11-23 03:18:49,675 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 6.1) internal successors, (122), 20 states have internal predecessors, (122), 20 states have call successors, (37), 2 states have call predecessors, (37), 1 states have return successors, (36), 19 states have call predecessors, (36), 19 states have call successors, (36) Word has length 178 [2021-11-23 03:18:49,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:18:49,714 INFO L225 Difference]: With dead ends: 6069 [2021-11-23 03:18:49,714 INFO L226 Difference]: Without dead ends: 5720 [2021-11-23 03:18:49,721 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 599 GetRequests, 485 SyntacticMatches, 10 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3621 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=999, Invalid=10131, Unknown=0, NotChecked=0, Total=11130 [2021-11-23 03:18:49,722 INFO L933 BasicCegarLoop]: 439 mSDtfsCounter, 482 mSDsluCounter, 2850 mSDsCounter, 0 mSdLazyCounter, 2076 mSolverCounterSat, 316 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 488 SdHoareTripleChecker+Valid, 3279 SdHoareTripleChecker+Invalid, 2392 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 316 IncrementalHoareTripleChecker+Valid, 2076 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-23 03:18:49,722 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [488 Valid, 3279 Invalid, 2392 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [316 Valid, 2076 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-23 03:18:49,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5720 states. [2021-11-23 03:18:50,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5720 to 4461. [2021-11-23 03:18:50,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4461 states, 3364 states have (on average 1.192627824019025) internal successors, (4012), 3436 states have internal predecessors, (4012), 1033 states have call successors, (1033), 64 states have call predecessors, (1033), 63 states have return successors, (1032), 960 states have call predecessors, (1032), 1032 states have call successors, (1032) [2021-11-23 03:18:50,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4461 states to 4461 states and 6077 transitions. [2021-11-23 03:18:50,440 INFO L78 Accepts]: Start accepts. Automaton has 4461 states and 6077 transitions. Word has length 178 [2021-11-23 03:18:50,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:18:50,441 INFO L470 AbstractCegarLoop]: Abstraction has 4461 states and 6077 transitions. [2021-11-23 03:18:50,441 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 6.1) internal successors, (122), 20 states have internal predecessors, (122), 20 states have call successors, (37), 2 states have call predecessors, (37), 1 states have return successors, (36), 19 states have call predecessors, (36), 19 states have call successors, (36) [2021-11-23 03:18:50,441 INFO L276 IsEmpty]: Start isEmpty. Operand 4461 states and 6077 transitions. [2021-11-23 03:18:50,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2021-11-23 03:18:50,462 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:18:50,462 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 11, 10, 10, 10, 7, 7, 6, 6, 6, 5, 4, 4, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:18:50,473 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-23 03:18:50,668 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:18:50,669 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:18:50,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:18:50,669 INFO L85 PathProgramCache]: Analyzing trace with hash 2135458502, now seen corresponding path program 9 times [2021-11-23 03:18:50,669 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:18:50,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [839761906] [2021-11-23 03:18:50,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:18:50,670 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:18:50,678 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:18:50,679 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [912356850] [2021-11-23 03:18:50,679 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:18:50,679 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:18:50,679 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:18:50,680 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:18:50,701 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-23 03:18:50,863 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:18:50,863 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:18:50,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 43 conjunts are in the unsatisfiable core [2021-11-23 03:18:50,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:18:51,348 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 60 proven. 1044 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:18:51,349 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:18:52,162 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 60 proven. 284 refuted. 0 times theorem prover too weak. 762 trivial. 0 not checked. [2021-11-23 03:18:52,162 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:18:52,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [839761906] [2021-11-23 03:18:52,163 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:18:52,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [912356850] [2021-11-23 03:18:52,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [912356850] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:18:52,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [27382166] [2021-11-23 03:18:52,165 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-23 03:18:52,165 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:18:52,165 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:18:52,166 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:18:52,166 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:18:55,911 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2021-11-23 03:18:55,919 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-23 03:18:55,951 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:18:59,063 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '63157#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:18:59,063 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:18:59,063 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:18:59,063 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 24] total 46 [2021-11-23 03:18:59,063 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590254189] [2021-11-23 03:18:59,063 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:18:59,064 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-23 03:18:59,064 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:18:59,065 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-23 03:18:59,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1242, Invalid=2918, Unknown=0, NotChecked=0, Total=4160 [2021-11-23 03:18:59,066 INFO L87 Difference]: Start difference. First operand 4461 states and 6077 transitions. Second operand has 46 states, 46 states have (on average 4.3478260869565215) internal successors, (200), 46 states have internal predecessors, (200), 43 states have call successors, (45), 23 states have call predecessors, (45), 22 states have return successors, (44), 42 states have call predecessors, (44), 42 states have call successors, (44) [2021-11-23 03:19:02,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:19:02,755 INFO L93 Difference]: Finished difference Result 19553 states and 29565 transitions. [2021-11-23 03:19:02,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2021-11-23 03:19:02,756 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 4.3478260869565215) internal successors, (200), 46 states have internal predecessors, (200), 43 states have call successors, (45), 23 states have call predecessors, (45), 22 states have return successors, (44), 42 states have call predecessors, (44), 42 states have call successors, (44) Word has length 178 [2021-11-23 03:19:02,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:19:02,866 INFO L225 Difference]: With dead ends: 19553 [2021-11-23 03:19:02,866 INFO L226 Difference]: Without dead ends: 19386 [2021-11-23 03:19:02,878 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 572 GetRequests, 459 SyntacticMatches, 10 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3811 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=2982, Invalid=7938, Unknown=0, NotChecked=0, Total=10920 [2021-11-23 03:19:02,878 INFO L933 BasicCegarLoop]: 144 mSDtfsCounter, 1418 mSDsluCounter, 834 mSDsCounter, 0 mSdLazyCounter, 732 mSolverCounterSat, 885 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1418 SdHoareTripleChecker+Valid, 976 SdHoareTripleChecker+Invalid, 1617 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 885 IncrementalHoareTripleChecker+Valid, 732 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:19:02,879 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1418 Valid, 976 Invalid, 1617 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [885 Valid, 732 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-23 03:19:02,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19386 states. [2021-11-23 03:19:05,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19386 to 19047. [2021-11-23 03:19:05,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19047 states, 14308 states have (on average 1.264607212748113) internal successors, (18094), 14432 states have internal predecessors, (18094), 4614 states have call successors, (4614), 125 states have call predecessors, (4614), 124 states have return successors, (4613), 4489 states have call predecessors, (4613), 4613 states have call successors, (4613) [2021-11-23 03:19:05,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19047 states to 19047 states and 27321 transitions. [2021-11-23 03:19:05,879 INFO L78 Accepts]: Start accepts. Automaton has 19047 states and 27321 transitions. Word has length 178 [2021-11-23 03:19:05,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:19:05,880 INFO L470 AbstractCegarLoop]: Abstraction has 19047 states and 27321 transitions. [2021-11-23 03:19:05,881 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 4.3478260869565215) internal successors, (200), 46 states have internal predecessors, (200), 43 states have call successors, (45), 23 states have call predecessors, (45), 22 states have return successors, (44), 42 states have call predecessors, (44), 42 states have call successors, (44) [2021-11-23 03:19:05,882 INFO L276 IsEmpty]: Start isEmpty. Operand 19047 states and 27321 transitions. [2021-11-23 03:19:05,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2021-11-23 03:19:05,911 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:19:05,912 INFO L514 BasicCegarLoop]: trace histogram [22, 21, 21, 10, 10, 10, 10, 8, 7, 7, 7, 6, 5, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:19:05,954 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-23 03:19:06,137 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-23 03:19:06,138 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:19:06,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:19:06,138 INFO L85 PathProgramCache]: Analyzing trace with hash 97743629, now seen corresponding path program 2 times [2021-11-23 03:19:06,139 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:19:06,139 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1065353849] [2021-11-23 03:19:06,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:19:06,139 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:19:06,147 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:19:06,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1444015786] [2021-11-23 03:19:06,148 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:19:06,148 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:19:06,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:19:06,149 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:19:06,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-23 03:19:06,606 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-23 03:19:06,606 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:19:06,611 INFO L263 TraceCheckSpWp]: Trace formula consists of 427 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-23 03:19:06,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:19:07,165 INFO L134 CoverageAnalysis]: Checked inductivity of 1194 backedges. 50 proven. 1142 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:19:07,165 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:19:08,079 INFO L134 CoverageAnalysis]: Checked inductivity of 1194 backedges. 50 proven. 302 refuted. 0 times theorem prover too weak. 842 trivial. 0 not checked. [2021-11-23 03:19:08,079 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:19:08,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1065353849] [2021-11-23 03:19:08,079 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:19:08,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1444015786] [2021-11-23 03:19:08,079 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1444015786] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:19:08,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [16862693] [2021-11-23 03:19:08,081 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-23 03:19:08,081 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:19:08,082 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:19:08,082 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:19:08,082 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:19:15,349 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 119 for LOIs [2021-11-23 03:19:16,621 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-23 03:19:16,653 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:19:31,429 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '119138#(and (<= 2 ~counter~0) (<= 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|) (<= ~counter~0 53))' at error location [2021-11-23 03:19:31,429 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:19:31,429 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:19:31,429 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 25] total 48 [2021-11-23 03:19:31,430 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1393967] [2021-11-23 03:19:31,430 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:19:31,430 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 03:19:31,430 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:19:31,431 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 03:19:31,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1332, Invalid=3223, Unknown=1, NotChecked=0, Total=4556 [2021-11-23 03:19:31,432 INFO L87 Difference]: Start difference. First operand 19047 states and 27321 transitions. Second operand has 48 states, 48 states have (on average 4.3125) internal successors, (207), 48 states have internal predecessors, (207), 45 states have call successors, (47), 24 states have call predecessors, (47), 23 states have return successors, (46), 44 states have call predecessors, (46), 44 states have call successors, (46) [2021-11-23 03:19:35,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:19:35,417 INFO L93 Difference]: Finished difference Result 28129 states and 40742 transitions. [2021-11-23 03:19:35,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2021-11-23 03:19:35,417 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 4.3125) internal successors, (207), 48 states have internal predecessors, (207), 45 states have call successors, (47), 24 states have call predecessors, (47), 23 states have return successors, (46), 44 states have call predecessors, (46), 44 states have call successors, (46) Word has length 184 [2021-11-23 03:19:35,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:19:35,467 INFO L225 Difference]: With dead ends: 28129 [2021-11-23 03:19:35,467 INFO L226 Difference]: Without dead ends: 13865 [2021-11-23 03:19:35,514 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 591 GetRequests, 477 SyntacticMatches, 7 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3810 ImplicationChecksByTransitivity, 16.6s TimeCoverageRelationStatistics Valid=3156, Invalid=8615, Unknown=1, NotChecked=0, Total=11772 [2021-11-23 03:19:35,514 INFO L933 BasicCegarLoop]: 150 mSDtfsCounter, 1752 mSDsluCounter, 675 mSDsCounter, 0 mSdLazyCounter, 802 mSolverCounterSat, 1208 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1752 SdHoareTripleChecker+Valid, 824 SdHoareTripleChecker+Invalid, 2010 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1208 IncrementalHoareTripleChecker+Valid, 802 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:19:35,515 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1752 Valid, 824 Invalid, 2010 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1208 Valid, 802 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-23 03:19:35,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13865 states. [2021-11-23 03:19:36,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13865 to 13587. [2021-11-23 03:19:37,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13587 states, 10196 states have (on average 1.1973322871714398) internal successors, (12208), 10270 states have internal predecessors, (12208), 3260 states have call successors, (3260), 131 states have call predecessors, (3260), 130 states have return successors, (3259), 3185 states have call predecessors, (3259), 3259 states have call successors, (3259) [2021-11-23 03:19:37,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13587 states to 13587 states and 18727 transitions. [2021-11-23 03:19:37,068 INFO L78 Accepts]: Start accepts. Automaton has 13587 states and 18727 transitions. Word has length 184 [2021-11-23 03:19:37,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:19:37,069 INFO L470 AbstractCegarLoop]: Abstraction has 13587 states and 18727 transitions. [2021-11-23 03:19:37,070 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 4.3125) internal successors, (207), 48 states have internal predecessors, (207), 45 states have call successors, (47), 24 states have call predecessors, (47), 23 states have return successors, (46), 44 states have call predecessors, (46), 44 states have call successors, (46) [2021-11-23 03:19:37,070 INFO L276 IsEmpty]: Start isEmpty. Operand 13587 states and 18727 transitions. [2021-11-23 03:19:37,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2021-11-23 03:19:37,096 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:19:37,097 INFO L514 BasicCegarLoop]: trace histogram [23, 22, 22, 10, 10, 10, 10, 8, 8, 8, 8, 6, 5, 4, 4, 4, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:19:37,106 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-23 03:19:37,301 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:19:37,302 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:19:37,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:19:37,303 INFO L85 PathProgramCache]: Analyzing trace with hash 1898418516, now seen corresponding path program 2 times [2021-11-23 03:19:37,303 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:19:37,303 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [593852484] [2021-11-23 03:19:37,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:19:37,303 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:19:37,318 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:19:37,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [603251694] [2021-11-23 03:19:37,329 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:19:37,329 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:19:37,330 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:19:37,330 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:19:37,352 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-23 03:19:37,957 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-23 03:19:37,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:19:37,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 437 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-23 03:19:37,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:19:38,715 INFO L134 CoverageAnalysis]: Checked inductivity of 1294 backedges. 44 proven. 1248 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:19:38,716 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:19:39,828 INFO L134 CoverageAnalysis]: Checked inductivity of 1294 backedges. 44 proven. 324 refuted. 0 times theorem prover too weak. 926 trivial. 0 not checked. [2021-11-23 03:19:39,828 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:19:39,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [593852484] [2021-11-23 03:19:39,829 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:19:39,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [603251694] [2021-11-23 03:19:39,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [603251694] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:19:39,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [911253681] [2021-11-23 03:19:39,830 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-23 03:19:39,830 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:19:39,831 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:19:39,831 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:19:39,831 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:19:45,785 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 136 for LOIs [2021-11-23 03:19:46,971 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-23 03:19:47,010 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:20:19,913 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '179259#(and (<= ~counter~0 52) (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:20:19,913 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:20:19,913 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:20:19,914 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 26] total 50 [2021-11-23 03:20:19,914 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1329335091] [2021-11-23 03:20:19,914 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:20:19,914 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-23 03:20:19,914 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:20:19,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-23 03:20:19,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1429, Invalid=3263, Unknown=0, NotChecked=0, Total=4692 [2021-11-23 03:20:19,916 INFO L87 Difference]: Start difference. First operand 13587 states and 18727 transitions. Second operand has 50 states, 50 states have (on average 4.28) internal successors, (214), 50 states have internal predecessors, (214), 47 states have call successors, (49), 25 states have call predecessors, (49), 24 states have return successors, (48), 46 states have call predecessors, (48), 46 states have call successors, (48) [2021-11-23 03:20:23,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:20:23,634 INFO L93 Difference]: Finished difference Result 14667 states and 20314 transitions. [2021-11-23 03:20:23,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2021-11-23 03:20:23,635 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 4.28) internal successors, (214), 50 states have internal predecessors, (214), 47 states have call successors, (49), 25 states have call predecessors, (49), 24 states have return successors, (48), 46 states have call predecessors, (48), 46 states have call successors, (48) Word has length 190 [2021-11-23 03:20:23,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:20:23,687 INFO L225 Difference]: With dead ends: 14667 [2021-11-23 03:20:23,687 INFO L226 Difference]: Without dead ends: 14520 [2021-11-23 03:20:23,694 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 610 GetRequests, 489 SyntacticMatches, 12 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4238 ImplicationChecksByTransitivity, 34.9s TimeCoverageRelationStatistics Valid=3342, Invalid=8868, Unknown=0, NotChecked=0, Total=12210 [2021-11-23 03:20:23,695 INFO L933 BasicCegarLoop]: 156 mSDtfsCounter, 1691 mSDsluCounter, 820 mSDsCounter, 0 mSdLazyCounter, 771 mSolverCounterSat, 1165 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1691 SdHoareTripleChecker+Valid, 974 SdHoareTripleChecker+Invalid, 1936 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1165 IncrementalHoareTripleChecker+Valid, 771 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:20:23,695 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1691 Valid, 974 Invalid, 1936 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1165 Valid, 771 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2021-11-23 03:20:23,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14520 states. [2021-11-23 03:20:25,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14520 to 13631. [2021-11-23 03:20:25,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13631 states, 10241 states have (on average 1.1364124597207304) internal successors, (11638), 10315 states have internal predecessors, (11638), 3254 states have call successors, (3254), 136 states have call predecessors, (3254), 135 states have return successors, (3253), 3179 states have call predecessors, (3253), 3253 states have call successors, (3253) [2021-11-23 03:20:25,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13631 states to 13631 states and 18145 transitions. [2021-11-23 03:20:25,114 INFO L78 Accepts]: Start accepts. Automaton has 13631 states and 18145 transitions. Word has length 190 [2021-11-23 03:20:25,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:20:25,114 INFO L470 AbstractCegarLoop]: Abstraction has 13631 states and 18145 transitions. [2021-11-23 03:20:25,115 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 4.28) internal successors, (214), 50 states have internal predecessors, (214), 47 states have call successors, (49), 25 states have call predecessors, (49), 24 states have return successors, (48), 46 states have call predecessors, (48), 46 states have call successors, (48) [2021-11-23 03:20:25,115 INFO L276 IsEmpty]: Start isEmpty. Operand 13631 states and 18145 transitions. [2021-11-23 03:20:25,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2021-11-23 03:20:25,176 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:20:25,176 INFO L514 BasicCegarLoop]: trace histogram [45, 44, 44, 20, 19, 19, 19, 17, 16, 16, 16, 11, 10, 9, 9, 9, 9, 8, 8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:20:25,185 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-23 03:20:25,381 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:20:25,382 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:20:25,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:20:25,383 INFO L85 PathProgramCache]: Analyzing trace with hash 1302721490, now seen corresponding path program 10 times [2021-11-23 03:20:25,383 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:20:25,383 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [551837221] [2021-11-23 03:20:25,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:20:25,383 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:20:25,400 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:20:25,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [81943448] [2021-11-23 03:20:25,401 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 03:20:25,401 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:20:25,401 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:20:25,402 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:20:25,422 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-23 03:20:25,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:20:25,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 813 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 03:20:25,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:20:31,767 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 416 proven. 1164 refuted. 0 times theorem prover too weak. 3690 trivial. 0 not checked. [2021-11-23 03:20:31,768 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:20:33,475 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 266 proven. 1204 refuted. 0 times theorem prover too weak. 3800 trivial. 0 not checked. [2021-11-23 03:20:33,475 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:20:33,475 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [551837221] [2021-11-23 03:20:33,475 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:20:33,475 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [81943448] [2021-11-23 03:20:33,476 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [81943448] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:20:33,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [146319234] [2021-11-23 03:20:33,478 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-23 03:20:33,478 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:20:33,478 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:20:33,478 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:20:33,479 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:20:37,168 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2021-11-23 03:20:37,179 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-23 03:20:37,224 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:20:52,616 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '221331#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:20:52,616 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:20:52,616 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:20:52,617 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 32 [2021-11-23 03:20:52,617 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266400569] [2021-11-23 03:20:52,617 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:20:52,618 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 03:20:52,618 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:20:52,618 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 03:20:52,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=2365, Unknown=1, NotChecked=0, Total=2550 [2021-11-23 03:20:52,619 INFO L87 Difference]: Start difference. First operand 13631 states and 18145 transitions. Second operand has 32 states, 32 states have (on average 7.34375) internal successors, (235), 32 states have internal predecessors, (235), 32 states have call successors, (75), 2 states have call predecessors, (75), 2 states have return successors, (74), 32 states have call predecessors, (74), 32 states have call successors, (74) [2021-11-23 03:21:09,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:21:09,657 INFO L93 Difference]: Finished difference Result 17638 states and 23435 transitions. [2021-11-23 03:21:09,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-23 03:21:09,658 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 7.34375) internal successors, (235), 32 states have internal predecessors, (235), 32 states have call successors, (75), 2 states have call predecessors, (75), 2 states have return successors, (74), 32 states have call predecessors, (74), 32 states have call successors, (74) Word has length 370 [2021-11-23 03:21:09,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:21:09,702 INFO L225 Difference]: With dead ends: 17638 [2021-11-23 03:21:09,702 INFO L226 Difference]: Without dead ends: 15600 [2021-11-23 03:21:09,711 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1149 GetRequests, 1039 SyntacticMatches, 31 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 2302 ImplicationChecksByTransitivity, 32.5s TimeCoverageRelationStatistics Valid=622, Invalid=5854, Unknown=4, NotChecked=0, Total=6480 [2021-11-23 03:21:09,711 INFO L933 BasicCegarLoop]: 362 mSDtfsCounter, 377 mSDsluCounter, 4745 mSDsCounter, 0 mSdLazyCounter, 1738 mSolverCounterSat, 179 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 382 SdHoareTripleChecker+Valid, 5089 SdHoareTripleChecker+Invalid, 2327 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 179 IncrementalHoareTripleChecker+Valid, 1738 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 410 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:21:09,712 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [382 Valid, 5089 Invalid, 2327 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [179 Valid, 1738 Invalid, 0 Unknown, 410 Unchecked, 1.6s Time] [2021-11-23 03:21:09,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15600 states. [2021-11-23 03:21:11,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15600 to 14303. [2021-11-23 03:21:11,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14303 states, 10750 states have (on average 1.134232558139535) internal successors, (12193), 10830 states have internal predecessors, (12193), 3417 states have call successors, (3417), 136 states have call predecessors, (3417), 135 states have return successors, (3416), 3336 states have call predecessors, (3416), 3416 states have call successors, (3416) [2021-11-23 03:21:11,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14303 states to 14303 states and 19026 transitions. [2021-11-23 03:21:11,392 INFO L78 Accepts]: Start accepts. Automaton has 14303 states and 19026 transitions. Word has length 370 [2021-11-23 03:21:11,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:21:11,393 INFO L470 AbstractCegarLoop]: Abstraction has 14303 states and 19026 transitions. [2021-11-23 03:21:11,394 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 7.34375) internal successors, (235), 32 states have internal predecessors, (235), 32 states have call successors, (75), 2 states have call predecessors, (75), 2 states have return successors, (74), 32 states have call predecessors, (74), 32 states have call successors, (74) [2021-11-23 03:21:11,394 INFO L276 IsEmpty]: Start isEmpty. Operand 14303 states and 19026 transitions. [2021-11-23 03:21:11,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2021-11-23 03:21:11,539 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:21:11,540 INFO L514 BasicCegarLoop]: trace histogram [45, 44, 44, 20, 19, 19, 19, 17, 16, 16, 16, 11, 10, 9, 9, 9, 9, 8, 8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:21:11,575 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-23 03:21:11,753 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-23 03:21:11,754 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:21:11,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:21:11,755 INFO L85 PathProgramCache]: Analyzing trace with hash -467354670, now seen corresponding path program 11 times [2021-11-23 03:21:11,755 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:21:11,755 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [753532750] [2021-11-23 03:21:11,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:21:11,755 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:21:11,767 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:21:11,767 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [4116137] [2021-11-23 03:21:11,767 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:21:11,768 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:21:11,768 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:21:11,768 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:21:11,793 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-23 03:21:16,773 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2021-11-23 03:21:16,774 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:21:16,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 764 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-23 03:21:16,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:21:18,014 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 176 proven. 1280 refuted. 0 times theorem prover too weak. 3814 trivial. 0 not checked. [2021-11-23 03:21:18,015 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:21:19,587 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 236 proven. 1220 refuted. 0 times theorem prover too weak. 3814 trivial. 0 not checked. [2021-11-23 03:21:19,587 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:21:19,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [753532750] [2021-11-23 03:21:19,587 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:21:19,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [4116137] [2021-11-23 03:21:19,588 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [4116137] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:21:19,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1256357400] [2021-11-23 03:21:19,589 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-23 03:21:19,590 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:21:19,590 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:21:19,590 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:21:19,590 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:21:23,049 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2021-11-23 03:21:23,059 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-23 03:21:23,092 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:21:33,522 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '268525#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 03:21:33,523 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:21:33,523 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:21:33,523 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 27 [2021-11-23 03:21:33,523 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1939832334] [2021-11-23 03:21:33,523 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:21:33,524 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-23 03:21:33,524 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:21:33,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-23 03:21:33,524 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=1902, Unknown=0, NotChecked=0, Total=2070 [2021-11-23 03:21:33,525 INFO L87 Difference]: Start difference. First operand 14303 states and 19026 transitions. Second operand has 27 states, 27 states have (on average 7.2592592592592595) internal successors, (196), 27 states have internal predecessors, (196), 27 states have call successors, (61), 2 states have call predecessors, (61), 1 states have return successors, (60), 26 states have call predecessors, (60), 26 states have call successors, (60) [2021-11-23 03:21:49,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:21:49,897 INFO L93 Difference]: Finished difference Result 31027 states and 41607 transitions. [2021-11-23 03:21:49,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2021-11-23 03:21:49,898 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 7.2592592592592595) internal successors, (196), 27 states have internal predecessors, (196), 27 states have call successors, (61), 2 states have call predecessors, (61), 1 states have return successors, (60), 26 states have call predecessors, (60), 26 states have call successors, (60) Word has length 370 [2021-11-23 03:21:49,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:21:49,971 INFO L225 Difference]: With dead ends: 31027 [2021-11-23 03:21:49,971 INFO L226 Difference]: Without dead ends: 29277 [2021-11-23 03:21:49,983 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1222 GetRequests, 1046 SyntacticMatches, 33 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 8041 ImplicationChecksByTransitivity, 20.2s TimeCoverageRelationStatistics Valid=1872, Invalid=19008, Unknown=0, NotChecked=0, Total=20880 [2021-11-23 03:21:49,984 INFO L933 BasicCegarLoop]: 661 mSDtfsCounter, 786 mSDsluCounter, 5324 mSDsCounter, 0 mSdLazyCounter, 3666 mSolverCounterSat, 425 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 795 SdHoareTripleChecker+Valid, 5972 SdHoareTripleChecker+Invalid, 4515 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 425 IncrementalHoareTripleChecker+Valid, 3666 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 424 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:21:49,985 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [795 Valid, 5972 Invalid, 4515 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [425 Valid, 3666 Invalid, 0 Unknown, 424 Unchecked, 3.6s Time] [2021-11-23 03:21:50,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29277 states. [2021-11-23 03:21:53,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29277 to 24015. [2021-11-23 03:21:53,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24015 states, 18042 states have (on average 1.136958208624321) internal successors, (20513), 18200 states have internal predecessors, (20513), 5837 states have call successors, (5837), 136 states have call predecessors, (5837), 135 states have return successors, (5836), 5678 states have call predecessors, (5836), 5836 states have call successors, (5836) [2021-11-23 03:21:53,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24015 states to 24015 states and 32186 transitions. [2021-11-23 03:21:53,361 INFO L78 Accepts]: Start accepts. Automaton has 24015 states and 32186 transitions. Word has length 370 [2021-11-23 03:21:53,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:21:53,362 INFO L470 AbstractCegarLoop]: Abstraction has 24015 states and 32186 transitions. [2021-11-23 03:21:53,362 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 7.2592592592592595) internal successors, (196), 27 states have internal predecessors, (196), 27 states have call successors, (61), 2 states have call predecessors, (61), 1 states have return successors, (60), 26 states have call predecessors, (60), 26 states have call successors, (60) [2021-11-23 03:21:53,362 INFO L276 IsEmpty]: Start isEmpty. Operand 24015 states and 32186 transitions. [2021-11-23 03:21:53,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2021-11-23 03:21:53,425 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:21:53,425 INFO L514 BasicCegarLoop]: trace histogram [45, 44, 44, 20, 19, 19, 19, 17, 16, 16, 16, 11, 10, 9, 9, 9, 9, 8, 8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:21:53,440 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-23 03:21:53,632 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-23 03:21:53,632 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:21:53,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:21:53,633 INFO L85 PathProgramCache]: Analyzing trace with hash -279568430, now seen corresponding path program 12 times [2021-11-23 03:21:53,633 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:21:53,633 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [594957274] [2021-11-23 03:21:53,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:21:53,633 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:21:53,644 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:21:53,644 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2028806467] [2021-11-23 03:21:53,644 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:21:53,644 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:21:53,645 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:21:53,645 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:21:53,672 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_54ec7985-a1e8-4f17-b019-9c3455b7e285/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-23 03:21:53,888 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:21:53,888 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:21:53,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 737 conjuncts, 133 conjunts are in the unsatisfiable core [2021-11-23 03:21:53,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:26:10,922 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 2808 proven. 765 refuted. 0 times theorem prover too weak. 1697 trivial. 0 not checked. [2021-11-23 03:26:10,922 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:26:15,867 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~v~0#1| Int) (|ULTIMATE.start_main_~r~0#1| Int)) (not (= (+ (* 4 |c_ULTIMATE.start_main_~A~0#1|) (* |ULTIMATE.start_main_~v~0#1| |ULTIMATE.start_main_~v~0#1|) (* 4 |ULTIMATE.start_main_~r~0#1|) (* 2 |c_ULTIMATE.start_main_~u~0#1|)) (+ (* 2 |ULTIMATE.start_main_~v~0#1|) (* |c_ULTIMATE.start_main_~u~0#1| |c_ULTIMATE.start_main_~u~0#1|))))) is different from false [2021-11-23 03:26:15,868 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:26:15,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [594957274] [2021-11-23 03:26:15,869 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:26:15,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2028806467] [2021-11-23 03:26:15,869 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2028806467] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:26:15,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [467562556] [2021-11-23 03:26:15,870 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-23 03:26:15,870 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:26:15,871 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:26:15,871 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:26:15,871 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:26:22,006 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 116 for LOIs [2021-11-23 03:26:22,019 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2021-11-23 03:26:22,053 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:26:40,812 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '347407#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 54))' at error location [2021-11-23 03:26:40,812 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:26:40,812 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:26:40,812 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2021-11-23 03:26:40,812 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149578675] [2021-11-23 03:26:40,812 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-23 03:26:40,813 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 03:26:40,813 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:26:40,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 03:26:40,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=2160, Unknown=1, NotChecked=94, Total=2450 [2021-11-23 03:26:40,814 INFO L87 Difference]: Start difference. First operand 24015 states and 32186 transitions. Second operand has 22 states, 21 states have (on average 5.523809523809524) internal successors, (116), 19 states have internal predecessors, (116), 16 states have call successors, (35), 2 states have call predecessors, (35), 4 states have return successors, (34), 18 states have call predecessors, (34), 16 states have call successors, (34) [2021-11-23 03:26:46,880 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.17s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 03:26:49,712 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.02s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers []