./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench/egcd3-ll.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench/egcd3-ll.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh --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 4ef08007570a64191e0df13d14d3e8d62a8022f43f46779ea6f6701a621376be --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-2329fc7 [2022-12-14 05:41:22,830 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 05:41:22,831 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 05:41:22,848 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 05:41:22,849 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 05:41:22,850 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 05:41:22,851 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 05:41:22,852 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 05:41:22,854 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 05:41:22,855 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 05:41:22,855 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 05:41:22,856 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 05:41:22,857 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 05:41:22,858 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 05:41:22,859 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 05:41:22,859 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 05:41:22,860 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 05:41:22,861 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 05:41:22,862 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 05:41:22,864 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 05:41:22,865 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 05:41:22,866 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 05:41:22,867 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 05:41:22,868 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 05:41:22,871 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 05:41:22,871 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 05:41:22,872 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 05:41:22,873 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 05:41:22,873 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 05:41:22,874 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 05:41:22,874 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 05:41:22,875 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 05:41:22,875 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 05:41:22,876 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 05:41:22,877 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 05:41:22,877 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 05:41:22,877 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 05:41:22,878 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 05:41:22,878 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 05:41:22,879 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 05:41:22,879 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 05:41:22,880 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 05:41:22,900 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 05:41:22,900 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 05:41:22,900 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 05:41:22,901 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 05:41:22,907 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 05:41:22,907 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 05:41:22,907 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 05:41:22,907 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 05:41:22,907 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 05:41:22,908 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 05:41:22,908 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 05:41:22,908 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 05:41:22,908 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 05:41:22,908 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 05:41:22,909 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 05:41:22,909 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 05:41:22,909 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 05:41:22,909 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 05:41:22,910 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 05:41:22,910 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 05:41:22,910 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 05:41:22,911 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 05:41:22,911 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 05:41:22,911 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 05:41:22,911 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 05:41:22,911 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 05:41:22,912 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 05:41:22,912 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 05:41:22,912 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 05:41:22,912 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 05:41:22,912 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 05:41:22,913 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 05:41:22,913 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 05:41:22,913 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 05:41:22,913 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 05:41:22,913 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 05:41:22,914 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 05:41:22,914 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 05:41:22,914 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 05:41:22,914 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 05:41:22,914 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 05:41:22,915 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4ef08007570a64191e0df13d14d3e8d62a8022f43f46779ea6f6701a621376be [2022-12-14 05:41:23,075 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 05:41:23,095 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 05:41:23,097 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 05:41:23,099 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 05:41:23,099 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 05:41:23,100 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/nla-digbench/egcd3-ll.c [2022-12-14 05:41:25,723 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 05:41:25,838 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 05:41:25,838 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/sv-benchmarks/c/nla-digbench/egcd3-ll.c [2022-12-14 05:41:25,843 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/data/6f388df95/e49053258c9848298f0268b7ac8f3bfd/FLAG087c918e0 [2022-12-14 05:41:25,853 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/data/6f388df95/e49053258c9848298f0268b7ac8f3bfd [2022-12-14 05:41:25,854 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 05:41:25,855 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 05:41:25,856 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 05:41:25,856 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 05:41:25,859 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 05:41:25,860 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 05:41:25" (1/1) ... [2022-12-14 05:41:25,861 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@80af2d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:41:25, skipping insertion in model container [2022-12-14 05:41:25,861 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 05:41:25" (1/1) ... [2022-12-14 05:41:25,866 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 05:41:25,877 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 05:41:25,988 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/sv-benchmarks/c/nla-digbench/egcd3-ll.c[490,503] [2022-12-14 05:41:26,005 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 05:41:26,015 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 05:41:26,024 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/sv-benchmarks/c/nla-digbench/egcd3-ll.c[490,503] [2022-12-14 05:41:26,033 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 05:41:26,044 INFO L208 MainTranslator]: Completed translation [2022-12-14 05:41:26,044 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:41:26 WrapperNode [2022-12-14 05:41:26,044 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 05:41:26,045 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 05:41:26,045 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 05:41:26,045 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 05:41:26,051 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:41:26" (1/1) ... [2022-12-14 05:41:26,056 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:41:26" (1/1) ... [2022-12-14 05:41:26,070 INFO L138 Inliner]: procedures = 14, calls = 14, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 78 [2022-12-14 05:41:26,070 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 05:41:26,071 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 05:41:26,071 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 05:41:26,071 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 05:41:26,078 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:41:26" (1/1) ... [2022-12-14 05:41:26,078 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:41:26" (1/1) ... [2022-12-14 05:41:26,080 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:41:26" (1/1) ... [2022-12-14 05:41:26,080 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:41:26" (1/1) ... [2022-12-14 05:41:26,083 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:41:26" (1/1) ... [2022-12-14 05:41:26,087 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:41:26" (1/1) ... [2022-12-14 05:41:26,088 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:41:26" (1/1) ... [2022-12-14 05:41:26,089 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:41:26" (1/1) ... [2022-12-14 05:41:26,091 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 05:41:26,092 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 05:41:26,092 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 05:41:26,092 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 05:41:26,093 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:41:26" (1/1) ... [2022-12-14 05:41:26,099 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 05:41:26,109 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:41:26,120 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 05:41:26,122 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 05:41:26,153 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 05:41:26,153 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-12-14 05:41:26,154 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-12-14 05:41:26,154 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 05:41:26,154 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 05:41:26,154 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 05:41:26,154 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-12-14 05:41:26,154 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-12-14 05:41:26,207 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 05:41:26,209 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 05:41:26,312 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 05:41:26,327 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 05:41:26,327 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-12-14 05:41:26,329 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 05:41:26 BoogieIcfgContainer [2022-12-14 05:41:26,329 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 05:41:26,330 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 05:41:26,330 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 05:41:26,333 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 05:41:26,333 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 05:41:25" (1/3) ... [2022-12-14 05:41:26,333 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f23edb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 05:41:26, skipping insertion in model container [2022-12-14 05:41:26,333 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 05:41:26" (2/3) ... [2022-12-14 05:41:26,334 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f23edb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 05:41:26, skipping insertion in model container [2022-12-14 05:41:26,334 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 05:41:26" (3/3) ... [2022-12-14 05:41:26,335 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd3-ll.c [2022-12-14 05:41:26,348 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 05:41:26,348 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 05:41:26,383 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 05:41:26,388 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@18859846, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 05:41:26,388 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 05:41:26,391 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 16 states have (on average 1.5) internal successors, (24), 17 states have internal predecessors, (24), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-12-14 05:41:26,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-12-14 05:41:26,396 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:41:26,397 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:41:26,397 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:41:26,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:41:26,401 INFO L85 PathProgramCache]: Analyzing trace with hash 1524023292, now seen corresponding path program 1 times [2022-12-14 05:41:26,408 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:41:26,408 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1507158900] [2022-12-14 05:41:26,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:41:26,409 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:41:26,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:41:26,496 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:41:26,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1507158900] [2022-12-14 05:41:26,497 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-12-14 05:41:26,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [847661123] [2022-12-14 05:41:26,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:41:26,498 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:41:26,498 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:41:26,499 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:41:26,500 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 05:41:26,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:41:26,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 1 conjunts are in the unsatisfiable core [2022-12-14 05:41:26,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:41:26,575 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 05:41:26,575 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 05:41:26,575 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [847661123] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 05:41:26,575 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 05:41:26,575 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 05:41:26,577 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1621125077] [2022-12-14 05:41:26,578 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 05:41:26,581 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-12-14 05:41:26,581 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:41:26,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-12-14 05:41:26,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-12-14 05:41:26,603 INFO L87 Difference]: Start difference. First operand has 27 states, 16 states have (on average 1.5) internal successors, (24), 17 states have internal predecessors, (24), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-12-14 05:41:26,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:41:26,629 INFO L93 Difference]: Finished difference Result 48 states and 74 transitions. [2022-12-14 05:41:26,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-12-14 05:41:26,631 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 13 [2022-12-14 05:41:26,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:41:26,636 INFO L225 Difference]: With dead ends: 48 [2022-12-14 05:41:26,636 INFO L226 Difference]: Without dead ends: 25 [2022-12-14 05:41:26,638 INFO L412 NwaCegarLoop]: 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 [2022-12-14 05:41:26,641 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 05:41:26,641 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 31 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 05:41:26,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-12-14 05:41:26,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-12-14 05:41:26,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 16 states have internal predecessors, (19), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-12-14 05:41:26,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 32 transitions. [2022-12-14 05:41:26,685 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 32 transitions. Word has length 13 [2022-12-14 05:41:26,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:41:26,686 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 32 transitions. [2022-12-14 05:41:26,687 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-12-14 05:41:26,687 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 32 transitions. [2022-12-14 05:41:26,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-12-14 05:41:26,694 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:41:26,694 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:41:26,700 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 05:41:26,895 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-12-14 05:41:26,897 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:41:26,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:41:26,899 INFO L85 PathProgramCache]: Analyzing trace with hash 1500233354, now seen corresponding path program 1 times [2022-12-14 05:41:26,900 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:41:26,901 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2098299333] [2022-12-14 05:41:26,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:41:26,902 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:41:26,948 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 05:41:26,949 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [414353061] [2022-12-14 05:41:26,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:41:26,950 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:41:26,950 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:41:26,953 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:41:26,957 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 05:41:27,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:41:27,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 7 conjunts are in the unsatisfiable core [2022-12-14 05:41:27,150 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:41:27,211 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 05:41:27,211 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 05:41:27,211 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:41:27,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2098299333] [2022-12-14 05:41:27,211 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 05:41:27,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [414353061] [2022-12-14 05:41:27,212 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [414353061] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 05:41:27,212 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 05:41:27,212 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-12-14 05:41:27,212 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524286065] [2022-12-14 05:41:27,212 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 05:41:27,213 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 05:41:27,213 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:41:27,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 05:41:27,214 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 05:41:27,214 INFO L87 Difference]: Start difference. First operand 25 states and 32 transitions. Second operand has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-12-14 05:41:27,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:41:27,278 INFO L93 Difference]: Finished difference Result 44 states and 57 transitions. [2022-12-14 05:41:27,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 05:41:27,278 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2022-12-14 05:41:27,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:41:27,280 INFO L225 Difference]: With dead ends: 44 [2022-12-14 05:41:27,280 INFO L226 Difference]: Without dead ends: 37 [2022-12-14 05:41:27,280 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-12-14 05:41:27,281 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 30 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 05:41:27,282 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 70 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 05:41:27,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-12-14 05:41:27,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 27. [2022-12-14 05:41:27,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-12-14 05:41:27,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 34 transitions. [2022-12-14 05:41:27,291 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 34 transitions. Word has length 14 [2022-12-14 05:41:27,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:41:27,292 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 34 transitions. [2022-12-14 05:41:27,292 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-12-14 05:41:27,292 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2022-12-14 05:41:27,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-12-14 05:41:27,293 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:41:27,293 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:41:27,298 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 05:41:27,494 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2022-12-14 05:41:27,496 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:41:27,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:41:27,498 INFO L85 PathProgramCache]: Analyzing trace with hash -640281993, now seen corresponding path program 1 times [2022-12-14 05:41:27,498 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:41:27,499 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [205889458] [2022-12-14 05:41:27,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:41:27,500 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:41:27,541 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 05:41:27,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [709836816] [2022-12-14 05:41:27,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:41:27,543 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:41:27,544 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:41:27,547 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:41:27,550 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 05:41:27,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:41:27,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 05:41:27,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:41:27,784 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 05:41:27,784 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 05:41:27,784 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:41:27,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [205889458] [2022-12-14 05:41:27,784 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 05:41:27,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [709836816] [2022-12-14 05:41:27,785 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [709836816] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 05:41:27,785 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 05:41:27,785 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-12-14 05:41:27,785 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352717436] [2022-12-14 05:41:27,785 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 05:41:27,785 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-12-14 05:41:27,786 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:41:27,786 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-12-14 05:41:27,786 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2022-12-14 05:41:27,787 INFO L87 Difference]: Start difference. First operand 27 states and 34 transitions. Second operand has 8 states, 6 states have (on average 2.0) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-12-14 05:41:27,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:41:27,869 INFO L93 Difference]: Finished difference Result 43 states and 55 transitions. [2022-12-14 05:41:27,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 05:41:27,870 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 2.0) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2022-12-14 05:41:27,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:41:27,871 INFO L225 Difference]: With dead ends: 43 [2022-12-14 05:41:27,871 INFO L226 Difference]: Without dead ends: 41 [2022-12-14 05:41:27,872 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2022-12-14 05:41:27,872 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 41 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 05:41:27,873 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 101 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 05:41:27,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-12-14 05:41:27,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 40. [2022-12-14 05:41:27,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 25 states have (on average 1.24) internal successors, (31), 26 states have internal predecessors, (31), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-12-14 05:41:27,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 52 transitions. [2022-12-14 05:41:27,879 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 52 transitions. Word has length 17 [2022-12-14 05:41:27,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:41:27,880 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 52 transitions. [2022-12-14 05:41:27,880 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 2.0) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-12-14 05:41:27,880 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 52 transitions. [2022-12-14 05:41:27,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-12-14 05:41:27,880 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:41:27,881 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:41:27,886 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 05:41:28,081 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:41:28,083 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:41:28,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:41:28,084 INFO L85 PathProgramCache]: Analyzing trace with hash -377003451, now seen corresponding path program 1 times [2022-12-14 05:41:28,085 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:41:28,085 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [926040357] [2022-12-14 05:41:28,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:41:28,086 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:41:28,120 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 05:41:28,121 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1468347660] [2022-12-14 05:41:28,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:41:28,121 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:41:28,122 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:41:28,124 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:41:28,127 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 05:41:28,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:41:28,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 9 conjunts are in the unsatisfiable core [2022-12-14 05:41:28,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:41:28,272 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 05:41:28,272 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:41:28,330 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 05:41:28,330 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:41:28,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [926040357] [2022-12-14 05:41:28,330 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 05:41:28,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1468347660] [2022-12-14 05:41:28,330 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1468347660] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 05:41:28,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1539631588] [2022-12-14 05:41:28,344 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-12-14 05:41:28,344 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:41:28,347 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:41:28,352 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:41:28,352 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:41:28,688 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 65 for LOIs [2022-12-14 05:41:28,722 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:41:29,888 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1539631588] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 05:41:29,888 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-12-14 05:41:29,889 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [7, 7] total 15 [2022-12-14 05:41:29,889 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1625818764] [2022-12-14 05:41:29,889 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 05:41:29,889 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-12-14 05:41:29,889 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:41:29,890 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-12-14 05:41:29,890 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2022-12-14 05:41:29,890 INFO L87 Difference]: Start difference. First operand 40 states and 52 transitions. Second operand has 10 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 05:41:30,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:41:30,113 INFO L93 Difference]: Finished difference Result 68 states and 92 transitions. [2022-12-14 05:41:30,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-12-14 05:41:30,113 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 19 [2022-12-14 05:41:30,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:41:30,114 INFO L225 Difference]: With dead ends: 68 [2022-12-14 05:41:30,114 INFO L226 Difference]: Without dead ends: 61 [2022-12-14 05:41:30,115 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 36 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2022-12-14 05:41:30,116 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 36 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 05:41:30,116 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 56 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 05:41:30,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-12-14 05:41:30,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 47. [2022-12-14 05:41:30,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 32 states have (on average 1.25) internal successors, (40), 33 states have internal predecessors, (40), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-12-14 05:41:30,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 61 transitions. [2022-12-14 05:41:30,136 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 61 transitions. Word has length 19 [2022-12-14 05:41:30,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:41:30,136 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 61 transitions. [2022-12-14 05:41:30,136 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 05:41:30,137 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 61 transitions. [2022-12-14 05:41:30,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-12-14 05:41:30,137 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:41:30,137 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:41:30,141 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 05:41:30,338 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:41:30,339 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:41:30,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:41:30,341 INFO L85 PathProgramCache]: Analyzing trace with hash 1954095958, now seen corresponding path program 1 times [2022-12-14 05:41:30,341 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:41:30,342 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1092296460] [2022-12-14 05:41:30,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:41:30,343 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:41:30,373 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 05:41:30,373 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2013464842] [2022-12-14 05:41:30,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:41:30,374 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:41:30,374 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:41:30,376 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:41:30,378 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 05:41:30,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:41:30,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 27 conjunts are in the unsatisfiable core [2022-12-14 05:41:30,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:41:30,683 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 05:41:30,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:41:30,753 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:41:30,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1092296460] [2022-12-14 05:41:30,753 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 05:41:30,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2013464842] [2022-12-14 05:41:30,754 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2013464842] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 05:41:30,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1764633567] [2022-12-14 05:41:30,755 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-12-14 05:41:30,755 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:41:30,755 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:41:30,756 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:41:30,756 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:41:30,935 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2022-12-14 05:41:30,942 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 65 for LOIs [2022-12-14 05:41:30,962 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:41:31,685 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1764633567] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 05:41:31,685 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 05:41:31,685 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [13] total 23 [2022-12-14 05:41:31,685 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610793335] [2022-12-14 05:41:31,685 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 05:41:31,686 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-12-14 05:41:31,686 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:41:31,686 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-12-14 05:41:31,686 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=530, Unknown=0, NotChecked=0, Total=650 [2022-12-14 05:41:31,686 INFO L87 Difference]: Start difference. First operand 47 states and 61 transitions. Second operand has 12 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 7 states have internal predecessors, (13), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-12-14 05:41:31,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:41:31,902 INFO L93 Difference]: Finished difference Result 69 states and 92 transitions. [2022-12-14 05:41:31,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 05:41:31,902 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 7 states have internal predecessors, (13), 3 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 [2022-12-14 05:41:31,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:41:31,903 INFO L225 Difference]: With dead ends: 69 [2022-12-14 05:41:31,903 INFO L226 Difference]: Without dead ends: 67 [2022-12-14 05:41:31,903 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 21 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=120, Invalid=530, Unknown=0, NotChecked=0, Total=650 [2022-12-14 05:41:31,904 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 31 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 05:41:31,904 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 58 Invalid, 195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 174 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 05:41:31,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-12-14 05:41:31,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 62. [2022-12-14 05:41:31,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 38 states have (on average 1.236842105263158) internal successors, (47), 40 states have internal predecessors, (47), 19 states have call successors, (19), 4 states have call predecessors, (19), 4 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2022-12-14 05:41:31,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 84 transitions. [2022-12-14 05:41:31,920 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 84 transitions. Word has length 22 [2022-12-14 05:41:31,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:41:31,920 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 84 transitions. [2022-12-14 05:41:31,920 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 7 states have internal predecessors, (13), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-12-14 05:41:31,920 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 84 transitions. [2022-12-14 05:41:31,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-12-14 05:41:31,921 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:41:31,921 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:41:31,925 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-12-14 05:41:32,122 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:41:32,122 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:41:32,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:41:32,124 INFO L85 PathProgramCache]: Analyzing trace with hash -632778532, now seen corresponding path program 1 times [2022-12-14 05:41:32,124 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:41:32,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [713252256] [2022-12-14 05:41:32,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:41:32,125 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:41:32,148 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 05:41:32,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [684430277] [2022-12-14 05:41:32,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:41:32,149 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:41:32,149 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:41:32,152 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:41:32,155 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 05:41:32,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:41:32,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 23 conjunts are in the unsatisfiable core [2022-12-14 05:41:32,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:41:32,267 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 05:41:32,267 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:41:32,372 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 05:41:32,372 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:41:32,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [713252256] [2022-12-14 05:41:32,372 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 05:41:32,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [684430277] [2022-12-14 05:41:32,372 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [684430277] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 05:41:32,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [837203308] [2022-12-14 05:41:32,374 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 05:41:32,374 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:41:32,374 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:41:32,374 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:41:32,375 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:41:32,932 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2022-12-14 05:41:32,936 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 65 for LOIs [2022-12-14 05:41:32,953 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:41:34,402 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [837203308] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 05:41:34,403 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-12-14 05:41:34,403 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [8, 6] total 23 [2022-12-14 05:41:34,403 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [925407260] [2022-12-14 05:41:34,403 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 05:41:34,403 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-12-14 05:41:34,403 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:41:34,404 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-12-14 05:41:34,404 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=425, Unknown=0, NotChecked=0, Total=506 [2022-12-14 05:41:34,404 INFO L87 Difference]: Start difference. First operand 62 states and 84 transitions. Second operand has 13 states, 10 states have (on average 1.3) internal successors, (13), 8 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 05:41:34,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:41:34,851 INFO L93 Difference]: Finished difference Result 93 states and 123 transitions. [2022-12-14 05:41:34,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-12-14 05:41:34,852 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 10 states have (on average 1.3) internal successors, (13), 8 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 22 [2022-12-14 05:41:34,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:41:34,853 INFO L225 Difference]: With dead ends: 93 [2022-12-14 05:41:34,853 INFO L226 Difference]: Without dead ends: 91 [2022-12-14 05:41:34,853 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=91, Invalid=461, Unknown=0, NotChecked=0, Total=552 [2022-12-14 05:41:34,854 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 28 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 05:41:34,854 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 74 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 05:41:34,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-12-14 05:41:34,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 85. [2022-12-14 05:41:34,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 50 states have (on average 1.2) internal successors, (60), 53 states have internal predecessors, (60), 27 states have call successors, (27), 7 states have call predecessors, (27), 7 states have return successors, (26), 24 states have call predecessors, (26), 26 states have call successors, (26) [2022-12-14 05:41:34,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 113 transitions. [2022-12-14 05:41:34,877 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 113 transitions. Word has length 22 [2022-12-14 05:41:34,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:41:34,877 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 113 transitions. [2022-12-14 05:41:34,877 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 10 states have (on average 1.3) internal successors, (13), 8 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-12-14 05:41:34,877 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 113 transitions. [2022-12-14 05:41:34,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-12-14 05:41:34,878 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:41:34,878 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 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, 1] [2022-12-14 05:41:34,882 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 05:41:35,079 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:41:35,080 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:41:35,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:41:35,081 INFO L85 PathProgramCache]: Analyzing trace with hash -143636076, now seen corresponding path program 1 times [2022-12-14 05:41:35,081 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:41:35,082 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [640688325] [2022-12-14 05:41:35,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:41:35,082 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:41:35,091 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 05:41:35,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [790748199] [2022-12-14 05:41:35,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:41:35,092 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:41:35,092 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:41:35,093 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:41:35,093 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 05:41:35,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:41:35,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 58 conjunts are in the unsatisfiable core [2022-12-14 05:41:35,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:41:35,638 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 12 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-12-14 05:41:35,639 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:41:37,147 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 11 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-12-14 05:41:37,148 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:41:37,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [640688325] [2022-12-14 05:41:37,148 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 05:41:37,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [790748199] [2022-12-14 05:41:37,148 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [790748199] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 05:41:37,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2109054861] [2022-12-14 05:41:37,150 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 05:41:37,151 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:41:37,151 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:41:37,151 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:41:37,151 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:41:41,151 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-12-14 05:41:41,154 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 65 for LOIs [2022-12-14 05:41:41,167 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:41:56,575 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1813#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 05:41:56,575 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 05:41:56,575 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 05:41:56,575 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 25 [2022-12-14 05:41:56,576 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204737153] [2022-12-14 05:41:56,576 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 05:41:56,576 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-12-14 05:41:56,576 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:41:56,576 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-12-14 05:41:56,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=1674, Unknown=0, NotChecked=0, Total=1892 [2022-12-14 05:41:56,577 INFO L87 Difference]: Start difference. First operand 85 states and 113 transitions. Second operand has 25 states, 22 states have (on average 1.9090909090909092) internal successors, (42), 22 states have internal predecessors, (42), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-12-14 05:42:10,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:42:10,492 INFO L93 Difference]: Finished difference Result 237 states and 341 transitions. [2022-12-14 05:42:10,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-12-14 05:42:10,493 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 22 states have (on average 1.9090909090909092) internal successors, (42), 22 states have internal predecessors, (42), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) Word has length 44 [2022-12-14 05:42:10,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:42:10,495 INFO L225 Difference]: With dead ends: 237 [2022-12-14 05:42:10,495 INFO L226 Difference]: Without dead ends: 199 [2022-12-14 05:42:10,496 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 87 SyntacticMatches, 1 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1477 ImplicationChecksByTransitivity, 25.0s TimeCoverageRelationStatistics Valid=646, Invalid=4466, Unknown=0, NotChecked=0, Total=5112 [2022-12-14 05:42:10,497 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 162 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 1319 mSolverCounterSat, 235 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 168 SdHoareTripleChecker+Valid, 187 SdHoareTripleChecker+Invalid, 1554 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 235 IncrementalHoareTripleChecker+Valid, 1319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.6s IncrementalHoareTripleChecker+Time [2022-12-14 05:42:10,497 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [168 Valid, 187 Invalid, 1554 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [235 Valid, 1319 Invalid, 0 Unknown, 0 Unchecked, 5.6s Time] [2022-12-14 05:42:10,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2022-12-14 05:42:10,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 150. [2022-12-14 05:42:10,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 98 states have (on average 1.2346938775510203) internal successors, (121), 100 states have internal predecessors, (121), 43 states have call successors, (43), 8 states have call predecessors, (43), 8 states have return successors, (42), 41 states have call predecessors, (42), 42 states have call successors, (42) [2022-12-14 05:42:10,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 206 transitions. [2022-12-14 05:42:10,565 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 206 transitions. Word has length 44 [2022-12-14 05:42:10,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:42:10,565 INFO L495 AbstractCegarLoop]: Abstraction has 150 states and 206 transitions. [2022-12-14 05:42:10,566 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 22 states have (on average 1.9090909090909092) internal successors, (42), 22 states have internal predecessors, (42), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-12-14 05:42:10,566 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 206 transitions. [2022-12-14 05:42:10,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-12-14 05:42:10,566 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:42:10,567 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 3, 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] [2022-12-14 05:42:10,571 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 05:42:10,767 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-12-14 05:42:10,768 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:42:10,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:42:10,770 INFO L85 PathProgramCache]: Analyzing trace with hash 227774145, now seen corresponding path program 1 times [2022-12-14 05:42:10,770 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:42:10,770 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [236881616] [2022-12-14 05:42:10,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:42:10,771 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:42:10,806 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 05:42:10,807 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1774253956] [2022-12-14 05:42:10,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:42:10,807 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:42:10,807 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:42:10,809 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:42:10,810 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 05:42:10,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:42:10,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 05:42:10,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:42:10,880 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 05:42:10,880 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 05:42:10,880 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:42:10,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [236881616] [2022-12-14 05:42:10,881 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 05:42:10,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1774253956] [2022-12-14 05:42:10,881 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1774253956] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 05:42:10,881 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 05:42:10,881 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-12-14 05:42:10,881 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944514808] [2022-12-14 05:42:10,881 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 05:42:10,882 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 05:42:10,882 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:42:10,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 05:42:10,882 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-12-14 05:42:10,882 INFO L87 Difference]: Start difference. First operand 150 states and 206 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-12-14 05:42:10,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:42:10,998 INFO L93 Difference]: Finished difference Result 247 states and 345 transitions. [2022-12-14 05:42:10,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 05:42:10,999 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 47 [2022-12-14 05:42:10,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:42:11,000 INFO L225 Difference]: With dead ends: 247 [2022-12-14 05:42:11,000 INFO L226 Difference]: Without dead ends: 181 [2022-12-14 05:42:11,001 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-12-14 05:42:11,001 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 3 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 05:42:11,001 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 69 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 05:42:11,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2022-12-14 05:42:11,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 175. [2022-12-14 05:42:11,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 111 states have (on average 1.2252252252252251) internal successors, (136), 112 states have internal predecessors, (136), 55 states have call successors, (55), 8 states have call predecessors, (55), 8 states have return successors, (54), 54 states have call predecessors, (54), 54 states have call successors, (54) [2022-12-14 05:42:11,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 245 transitions. [2022-12-14 05:42:11,082 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 245 transitions. Word has length 47 [2022-12-14 05:42:11,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:42:11,082 INFO L495 AbstractCegarLoop]: Abstraction has 175 states and 245 transitions. [2022-12-14 05:42:11,082 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-12-14 05:42:11,083 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 245 transitions. [2022-12-14 05:42:11,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-12-14 05:42:11,084 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:42:11,084 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:42:11,089 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-12-14 05:42:11,284 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:42:11,286 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:42:11,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:42:11,287 INFO L85 PathProgramCache]: Analyzing trace with hash 583515831, now seen corresponding path program 1 times [2022-12-14 05:42:11,287 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:42:11,287 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [327461283] [2022-12-14 05:42:11,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:42:11,288 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:42:11,304 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 05:42:11,304 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [58147386] [2022-12-14 05:42:11,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:42:11,304 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:42:11,304 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:42:11,305 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:42:11,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 05:42:11,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:42:11,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 05:42:11,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:42:11,466 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 23 proven. 15 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2022-12-14 05:42:11,466 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:42:11,542 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2022-12-14 05:42:11,542 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:42:11,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [327461283] [2022-12-14 05:42:11,542 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 05:42:11,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [58147386] [2022-12-14 05:42:11,543 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [58147386] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 05:42:11,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [42576384] [2022-12-14 05:42:11,544 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2022-12-14 05:42:11,544 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:42:11,544 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:42:11,544 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:42:11,544 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:42:13,878 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2022-12-14 05:42:13,904 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 65 for LOIs [2022-12-14 05:42:13,917 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:42:16,734 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3625#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 05:42:16,734 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 05:42:16,734 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 05:42:16,734 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6] total 14 [2022-12-14 05:42:16,734 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [430461055] [2022-12-14 05:42:16,734 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 05:42:16,734 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-12-14 05:42:16,734 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:42:16,735 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-12-14 05:42:16,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=798, Unknown=0, NotChecked=0, Total=930 [2022-12-14 05:42:16,735 INFO L87 Difference]: Start difference. First operand 175 states and 245 transitions. Second operand has 14 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 12 states have internal predecessors, (32), 4 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (17), 5 states have call predecessors, (17), 4 states have call successors, (17) [2022-12-14 05:42:17,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:42:17,119 INFO L93 Difference]: Finished difference Result 219 states and 299 transitions. [2022-12-14 05:42:17,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-12-14 05:42:17,119 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 12 states have internal predecessors, (32), 4 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (17), 5 states have call predecessors, (17), 4 states have call successors, (17) Word has length 54 [2022-12-14 05:42:17,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:42:17,120 INFO L225 Difference]: With dead ends: 219 [2022-12-14 05:42:17,120 INFO L226 Difference]: Without dead ends: 217 [2022-12-14 05:42:17,121 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 134 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 340 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=183, Invalid=1223, Unknown=0, NotChecked=0, Total=1406 [2022-12-14 05:42:17,121 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 55 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 379 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 412 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 379 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 05:42:17,121 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 104 Invalid, 412 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 379 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 05:42:17,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2022-12-14 05:42:17,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 187. [2022-12-14 05:42:17,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 120 states have (on average 1.2083333333333333) internal successors, (145), 121 states have internal predecessors, (145), 55 states have call successors, (55), 11 states have call predecessors, (55), 11 states have return successors, (54), 54 states have call predecessors, (54), 54 states have call successors, (54) [2022-12-14 05:42:17,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 254 transitions. [2022-12-14 05:42:17,201 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 254 transitions. Word has length 54 [2022-12-14 05:42:17,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:42:17,202 INFO L495 AbstractCegarLoop]: Abstraction has 187 states and 254 transitions. [2022-12-14 05:42:17,202 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 12 states have internal predecessors, (32), 4 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (17), 5 states have call predecessors, (17), 4 states have call successors, (17) [2022-12-14 05:42:17,202 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 254 transitions. [2022-12-14 05:42:17,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-12-14 05:42:17,203 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:42:17,203 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:42:17,208 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-12-14 05:42:17,403 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:42:17,405 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:42:17,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:42:17,406 INFO L85 PathProgramCache]: Analyzing trace with hash 658403814, now seen corresponding path program 2 times [2022-12-14 05:42:17,406 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:42:17,406 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [675000215] [2022-12-14 05:42:17,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:42:17,407 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:42:17,431 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 05:42:17,432 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [602833928] [2022-12-14 05:42:17,432 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 05:42:17,432 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:42:17,433 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:42:17,435 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:42:17,439 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 05:42:17,485 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 05:42:17,485 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 05:42:17,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 5 conjunts are in the unsatisfiable core [2022-12-14 05:42:17,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:42:17,500 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 27 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-12-14 05:42:17,500 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 05:42:17,500 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:42:17,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [675000215] [2022-12-14 05:42:17,500 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 05:42:17,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [602833928] [2022-12-14 05:42:17,500 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [602833928] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 05:42:17,500 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 05:42:17,500 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-12-14 05:42:17,500 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1362781166] [2022-12-14 05:42:17,500 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 05:42:17,501 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 05:42:17,501 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:42:17,501 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 05:42:17,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 05:42:17,501 INFO L87 Difference]: Start difference. First operand 187 states and 254 transitions. Second operand has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2022-12-14 05:42:17,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:42:17,655 INFO L93 Difference]: Finished difference Result 278 states and 380 transitions. [2022-12-14 05:42:17,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 05:42:17,656 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 52 [2022-12-14 05:42:17,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:42:17,656 INFO L225 Difference]: With dead ends: 278 [2022-12-14 05:42:17,656 INFO L226 Difference]: Without dead ends: 204 [2022-12-14 05:42:17,657 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-12-14 05:42:17,657 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 19 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 05:42:17,657 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 102 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 05:42:17,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2022-12-14 05:42:17,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 178. [2022-12-14 05:42:17,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 115 states have (on average 1.173913043478261) internal successors, (135), 116 states have internal predecessors, (135), 51 states have call successors, (51), 11 states have call predecessors, (51), 11 states have return successors, (50), 50 states have call predecessors, (50), 50 states have call successors, (50) [2022-12-14 05:42:17,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 236 transitions. [2022-12-14 05:42:17,733 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 236 transitions. Word has length 52 [2022-12-14 05:42:17,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:42:17,734 INFO L495 AbstractCegarLoop]: Abstraction has 178 states and 236 transitions. [2022-12-14 05:42:17,734 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2022-12-14 05:42:17,734 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 236 transitions. [2022-12-14 05:42:17,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-12-14 05:42:17,734 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:42:17,734 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:42:17,738 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-12-14 05:42:17,935 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:42:17,936 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:42:17,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:42:17,937 INFO L85 PathProgramCache]: Analyzing trace with hash -1948306734, now seen corresponding path program 3 times [2022-12-14 05:42:17,937 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:42:17,938 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [994400817] [2022-12-14 05:42:17,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:42:17,938 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:42:17,960 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 05:42:17,960 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [337732926] [2022-12-14 05:42:17,961 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 05:42:17,961 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:42:17,961 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:42:17,964 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:42:17,966 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-12-14 05:42:18,003 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 05:42:18,003 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 05:42:18,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 32 conjunts are in the unsatisfiable core [2022-12-14 05:42:18,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:42:20,340 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 29 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-12-14 05:42:20,340 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:42:20,940 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 25 proven. 9 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-12-14 05:42:20,940 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:42:20,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [994400817] [2022-12-14 05:42:20,940 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 05:42:20,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [337732926] [2022-12-14 05:42:20,941 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [337732926] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 05:42:20,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [607267750] [2022-12-14 05:42:20,943 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 05:42:20,943 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:42:20,943 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:42:20,943 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:42:20,943 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:42:24,567 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-12-14 05:42:24,570 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 65 for LOIs [2022-12-14 05:42:24,583 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:42:34,978 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5475#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 05:42:34,978 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 05:42:34,979 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 05:42:34,979 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 8] total 22 [2022-12-14 05:42:34,979 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631351349] [2022-12-14 05:42:34,979 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 05:42:34,979 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-12-14 05:42:34,980 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:42:34,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-12-14 05:42:34,981 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=1382, Unknown=0, NotChecked=0, Total=1560 [2022-12-14 05:42:34,981 INFO L87 Difference]: Start difference. First operand 178 states and 236 transitions. Second operand has 22 states, 21 states have (on average 2.619047619047619) internal successors, (55), 18 states have internal predecessors, (55), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-12-14 05:42:50,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:42:50,605 INFO L93 Difference]: Finished difference Result 254 states and 334 transitions. [2022-12-14 05:42:50,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-12-14 05:42:50,606 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.619047619047619) internal successors, (55), 18 states have internal predecessors, (55), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) Word has length 52 [2022-12-14 05:42:50,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:42:50,607 INFO L225 Difference]: With dead ends: 254 [2022-12-14 05:42:50,607 INFO L226 Difference]: Without dead ends: 252 [2022-12-14 05:42:50,607 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 853 ImplicationChecksByTransitivity, 21.2s TimeCoverageRelationStatistics Valid=344, Invalid=2736, Unknown=0, NotChecked=0, Total=3080 [2022-12-14 05:42:50,608 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 92 mSDsluCounter, 230 mSDsCounter, 0 mSdLazyCounter, 1008 mSolverCounterSat, 125 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 269 SdHoareTripleChecker+Invalid, 1133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 125 IncrementalHoareTripleChecker+Valid, 1008 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.4s IncrementalHoareTripleChecker+Time [2022-12-14 05:42:50,608 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [94 Valid, 269 Invalid, 1133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [125 Valid, 1008 Invalid, 0 Unknown, 0 Unchecked, 6.4s Time] [2022-12-14 05:42:50,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2022-12-14 05:42:50,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 197. [2022-12-14 05:42:50,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 197 states, 128 states have (on average 1.15625) internal successors, (148), 130 states have internal predecessors, (148), 53 states have call successors, (53), 15 states have call predecessors, (53), 15 states have return successors, (52), 51 states have call predecessors, (52), 52 states have call successors, (52) [2022-12-14 05:42:50,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 253 transitions. [2022-12-14 05:42:50,693 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 253 transitions. Word has length 52 [2022-12-14 05:42:50,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:42:50,693 INFO L495 AbstractCegarLoop]: Abstraction has 197 states and 253 transitions. [2022-12-14 05:42:50,693 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 2.619047619047619) internal successors, (55), 18 states have internal predecessors, (55), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-12-14 05:42:50,693 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 253 transitions. [2022-12-14 05:42:50,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-12-14 05:42:50,694 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:42:50,694 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:42:50,698 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-12-14 05:42:50,895 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-12-14 05:42:50,896 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:42:50,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:42:50,897 INFO L85 PathProgramCache]: Analyzing trace with hash 1501893325, now seen corresponding path program 4 times [2022-12-14 05:42:50,897 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:42:50,898 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1451430853] [2022-12-14 05:42:50,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:42:50,898 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:42:50,920 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 05:42:50,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2001891315] [2022-12-14 05:42:50,921 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 05:42:50,922 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:42:50,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:42:50,925 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:42:50,928 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-12-14 05:42:50,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:42:50,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 23 conjunts are in the unsatisfiable core [2022-12-14 05:42:50,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:42:51,063 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 18 proven. 7 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2022-12-14 05:42:51,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:42:51,100 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-12-14 05:42:51,100 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:42:51,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1451430853] [2022-12-14 05:42:51,101 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 05:42:51,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2001891315] [2022-12-14 05:42:51,101 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2001891315] provided 1 perfect and 1 imperfect interpolant sequences [2022-12-14 05:42:51,101 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 05:42:51,101 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [11] total 14 [2022-12-14 05:42:51,101 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [415968719] [2022-12-14 05:42:51,101 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 05:42:51,101 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 05:42:51,101 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:42:51,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 05:42:51,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2022-12-14 05:42:51,102 INFO L87 Difference]: Start difference. First operand 197 states and 253 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-12-14 05:42:51,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:42:51,237 INFO L93 Difference]: Finished difference Result 225 states and 292 transitions. [2022-12-14 05:42:51,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 05:42:51,238 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 57 [2022-12-14 05:42:51,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:42:51,238 INFO L225 Difference]: With dead ends: 225 [2022-12-14 05:42:51,238 INFO L226 Difference]: Without dead ends: 223 [2022-12-14 05:42:51,239 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2022-12-14 05:42:51,239 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 7 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 05:42:51,239 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 85 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 05:42:51,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2022-12-14 05:42:51,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 220. [2022-12-14 05:42:51,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 220 states, 139 states have (on average 1.1654676258992807) internal successors, (162), 140 states have internal predecessors, (162), 63 states have call successors, (63), 17 states have call predecessors, (63), 17 states have return successors, (62), 62 states have call predecessors, (62), 62 states have call successors, (62) [2022-12-14 05:42:51,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 287 transitions. [2022-12-14 05:42:51,342 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 287 transitions. Word has length 57 [2022-12-14 05:42:51,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:42:51,342 INFO L495 AbstractCegarLoop]: Abstraction has 220 states and 287 transitions. [2022-12-14 05:42:51,342 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-12-14 05:42:51,342 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 287 transitions. [2022-12-14 05:42:51,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-12-14 05:42:51,343 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:42:51,343 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 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] [2022-12-14 05:42:51,347 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-12-14 05:42:51,544 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-12-14 05:42:51,544 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:42:51,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:42:51,545 INFO L85 PathProgramCache]: Analyzing trace with hash -697498661, now seen corresponding path program 5 times [2022-12-14 05:42:51,545 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:42:51,545 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [328123631] [2022-12-14 05:42:51,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:42:51,546 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:42:51,564 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 05:42:51,565 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2146787753] [2022-12-14 05:42:51,565 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 05:42:51,565 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:42:51,566 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:42:51,568 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:42:51,571 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-12-14 05:42:51,632 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 05:42:51,632 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 05:42:51,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 71 conjunts are in the unsatisfiable core [2022-12-14 05:42:51,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:42:52,022 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 21 proven. 23 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 05:42:52,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:42:52,963 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 23 proven. 21 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 05:42:52,963 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:42:52,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [328123631] [2022-12-14 05:42:52,963 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 05:42:52,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2146787753] [2022-12-14 05:42:52,963 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2146787753] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 05:42:52,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [817917104] [2022-12-14 05:42:52,965 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 05:42:52,965 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:42:52,965 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:42:52,965 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:42:52,965 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:42:56,430 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-12-14 05:42:56,434 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 65 for LOIs [2022-12-14 05:42:56,447 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:43:12,805 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7612#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 05:43:12,805 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 05:43:12,805 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 05:43:12,805 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 28 [2022-12-14 05:43:12,805 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1109139128] [2022-12-14 05:43:12,805 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 05:43:12,805 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-12-14 05:43:12,806 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:43:12,806 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-12-14 05:43:12,806 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=275, Invalid=1795, Unknown=0, NotChecked=0, Total=2070 [2022-12-14 05:43:12,806 INFO L87 Difference]: Start difference. First operand 220 states and 287 transitions. Second operand has 28 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 7 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-12-14 05:43:27,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:43:27,491 INFO L93 Difference]: Finished difference Result 328 states and 433 transitions. [2022-12-14 05:43:27,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-12-14 05:43:27,492 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 7 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) Word has length 57 [2022-12-14 05:43:27,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:43:27,493 INFO L225 Difference]: With dead ends: 328 [2022-12-14 05:43:27,494 INFO L226 Difference]: Without dead ends: 326 [2022-12-14 05:43:27,496 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1545 ImplicationChecksByTransitivity, 27.8s TimeCoverageRelationStatistics Valid=826, Invalid=4724, Unknown=0, NotChecked=0, Total=5550 [2022-12-14 05:43:27,496 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 205 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 1460 mSolverCounterSat, 325 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 205 SdHoareTripleChecker+Valid, 255 SdHoareTripleChecker+Invalid, 1785 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 325 IncrementalHoareTripleChecker+Valid, 1460 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2022-12-14 05:43:27,497 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [205 Valid, 255 Invalid, 1785 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [325 Valid, 1460 Invalid, 0 Unknown, 0 Unchecked, 3.7s Time] [2022-12-14 05:43:27,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2022-12-14 05:43:27,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 293. [2022-12-14 05:43:27,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 293 states, 188 states have (on average 1.1595744680851063) internal successors, (218), 191 states have internal predecessors, (218), 83 states have call successors, (83), 21 states have call predecessors, (83), 21 states have return successors, (82), 80 states have call predecessors, (82), 82 states have call successors, (82) [2022-12-14 05:43:27,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 293 states and 383 transitions. [2022-12-14 05:43:27,673 INFO L78 Accepts]: Start accepts. Automaton has 293 states and 383 transitions. Word has length 57 [2022-12-14 05:43:27,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:43:27,673 INFO L495 AbstractCegarLoop]: Abstraction has 293 states and 383 transitions. [2022-12-14 05:43:27,674 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 7 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-12-14 05:43:27,674 INFO L276 IsEmpty]: Start isEmpty. Operand 293 states and 383 transitions. [2022-12-14 05:43:27,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-12-14 05:43:27,674 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:43:27,674 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:43:27,679 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-12-14 05:43:27,875 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:43:27,876 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:43:27,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:43:27,877 INFO L85 PathProgramCache]: Analyzing trace with hash -712450224, now seen corresponding path program 1 times [2022-12-14 05:43:27,877 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:43:27,878 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1336026399] [2022-12-14 05:43:27,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:43:27,878 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:43:27,896 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 05:43:27,896 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1402714728] [2022-12-14 05:43:27,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:43:27,897 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:43:27,897 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:43:27,897 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:43:27,898 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-12-14 05:43:27,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:43:27,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 81 conjunts are in the unsatisfiable core [2022-12-14 05:43:27,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:43:28,719 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 30 proven. 27 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-12-14 05:43:28,719 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:43:34,788 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 30 proven. 26 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2022-12-14 05:43:34,789 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:43:34,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1336026399] [2022-12-14 05:43:34,789 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 05:43:34,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1402714728] [2022-12-14 05:43:34,789 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1402714728] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 05:43:34,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1904350528] [2022-12-14 05:43:34,791 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 05:43:34,791 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:43:34,791 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:43:34,791 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:43:34,791 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:43:38,995 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-12-14 05:43:38,998 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 65 for LOIs [2022-12-14 05:43:39,016 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:44:08,202 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9093#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 05:44:08,202 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 05:44:08,202 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 05:44:08,202 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 16] total 33 [2022-12-14 05:44:08,202 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328288440] [2022-12-14 05:44:08,202 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 05:44:08,203 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-12-14 05:44:08,203 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:44:08,203 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-12-14 05:44:08,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=2151, Unknown=1, NotChecked=0, Total=2450 [2022-12-14 05:44:08,204 INFO L87 Difference]: Start difference. First operand 293 states and 383 transitions. Second operand has 33 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 31 states have internal predecessors, (57), 10 states have call successors, (22), 3 states have call predecessors, (22), 3 states have return successors, (20), 7 states have call predecessors, (20), 8 states have call successors, (20) [2022-12-14 05:44:10,423 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.15s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:44:23,092 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.04s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:45:24,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:45:24,311 INFO L93 Difference]: Finished difference Result 499 states and 686 transitions. [2022-12-14 05:45:24,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2022-12-14 05:45:24,311 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 31 states have internal predecessors, (57), 10 states have call successors, (22), 3 states have call predecessors, (22), 3 states have return successors, (20), 7 states have call predecessors, (20), 8 states have call successors, (20) Word has length 71 [2022-12-14 05:45:24,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:45:24,313 INFO L225 Difference]: With dead ends: 499 [2022-12-14 05:45:24,313 INFO L226 Difference]: Without dead ends: 495 [2022-12-14 05:45:24,315 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 153 SyntacticMatches, 10 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3854 ImplicationChecksByTransitivity, 80.1s TimeCoverageRelationStatistics Valid=1646, Invalid=9909, Unknown=1, NotChecked=0, Total=11556 [2022-12-14 05:45:24,315 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 326 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 2205 mSolverCounterSat, 689 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 27.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 326 SdHoareTripleChecker+Valid, 323 SdHoareTripleChecker+Invalid, 2894 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 689 IncrementalHoareTripleChecker+Valid, 2205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 28.0s IncrementalHoareTripleChecker+Time [2022-12-14 05:45:24,315 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [326 Valid, 323 Invalid, 2894 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [689 Valid, 2205 Invalid, 0 Unknown, 0 Unchecked, 28.0s Time] [2022-12-14 05:45:24,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 495 states. [2022-12-14 05:45:24,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 495 to 471. [2022-12-14 05:45:24,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 299 states have (on average 1.1839464882943145) internal successors, (354), 303 states have internal predecessors, (354), 145 states have call successors, (145), 26 states have call predecessors, (145), 26 states have return successors, (144), 141 states have call predecessors, (144), 144 states have call successors, (144) [2022-12-14 05:45:24,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 643 transitions. [2022-12-14 05:45:24,740 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 643 transitions. Word has length 71 [2022-12-14 05:45:24,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:45:24,740 INFO L495 AbstractCegarLoop]: Abstraction has 471 states and 643 transitions. [2022-12-14 05:45:24,740 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 31 states have internal predecessors, (57), 10 states have call successors, (22), 3 states have call predecessors, (22), 3 states have return successors, (20), 7 states have call predecessors, (20), 8 states have call successors, (20) [2022-12-14 05:45:24,740 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 643 transitions. [2022-12-14 05:45:24,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-12-14 05:45:24,741 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:45:24,741 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:45:24,746 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-12-14 05:45:24,941 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-12-14 05:45:24,943 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:45:24,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:45:24,944 INFO L85 PathProgramCache]: Analyzing trace with hash 1599192679, now seen corresponding path program 1 times [2022-12-14 05:45:24,944 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:45:24,944 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [891314724] [2022-12-14 05:45:24,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:45:24,945 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:45:24,954 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 05:45:24,955 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1203790155] [2022-12-14 05:45:24,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:45:24,955 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:45:24,955 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:45:24,956 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:45:24,956 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-12-14 05:45:24,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:45:24,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 31 conjunts are in the unsatisfiable core [2022-12-14 05:45:25,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:45:25,185 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 20 proven. 17 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2022-12-14 05:45:25,186 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:45:25,800 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 22 proven. 14 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2022-12-14 05:45:25,800 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:45:25,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [891314724] [2022-12-14 05:45:25,800 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 05:45:25,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1203790155] [2022-12-14 05:45:25,800 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1203790155] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 05:45:25,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1276135679] [2022-12-14 05:45:25,802 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-12-14 05:45:25,802 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:45:25,802 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:45:25,802 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:45:25,802 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:45:29,655 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2022-12-14 05:45:29,689 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 65 for LOIs [2022-12-14 05:45:29,709 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:45:38,923 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11192#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 05:45:38,923 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 05:45:38,923 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 05:45:38,923 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 20 [2022-12-14 05:45:38,923 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317690496] [2022-12-14 05:45:38,923 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 05:45:38,923 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-12-14 05:45:38,924 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:45:38,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-12-14 05:45:38,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=1224, Unknown=1, NotChecked=0, Total=1406 [2022-12-14 05:45:38,924 INFO L87 Difference]: Start difference. First operand 471 states and 643 transitions. Second operand has 20 states, 19 states have (on average 1.894736842105263) internal successors, (36), 17 states have internal predecessors, (36), 8 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) [2022-12-14 05:45:42,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:45:42,497 INFO L93 Difference]: Finished difference Result 925 states and 1379 transitions. [2022-12-14 05:45:42,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-12-14 05:45:42,498 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.894736842105263) internal successors, (36), 17 states have internal predecessors, (36), 8 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) Word has length 74 [2022-12-14 05:45:42,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:45:42,500 INFO L225 Difference]: With dead ends: 925 [2022-12-14 05:45:42,500 INFO L226 Difference]: Without dead ends: 923 [2022-12-14 05:45:42,501 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 185 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 929 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=488, Invalid=2933, Unknown=1, NotChecked=0, Total=3422 [2022-12-14 05:45:42,501 INFO L413 NwaCegarLoop]: 69 mSDtfsCounter, 159 mSDsluCounter, 371 mSDsCounter, 0 mSdLazyCounter, 697 mSolverCounterSat, 211 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 440 SdHoareTripleChecker+Invalid, 908 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 211 IncrementalHoareTripleChecker+Valid, 697 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-12-14 05:45:42,502 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [163 Valid, 440 Invalid, 908 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [211 Valid, 697 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-12-14 05:45:42,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 923 states. [2022-12-14 05:45:43,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 923 to 841. [2022-12-14 05:45:43,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 841 states, 449 states have (on average 1.265033407572383) internal successors, (568), 453 states have internal predecessors, (568), 361 states have call successors, (361), 30 states have call predecessors, (361), 30 states have return successors, (360), 357 states have call predecessors, (360), 360 states have call successors, (360) [2022-12-14 05:45:43,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 841 states to 841 states and 1289 transitions. [2022-12-14 05:45:43,608 INFO L78 Accepts]: Start accepts. Automaton has 841 states and 1289 transitions. Word has length 74 [2022-12-14 05:45:43,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:45:43,609 INFO L495 AbstractCegarLoop]: Abstraction has 841 states and 1289 transitions. [2022-12-14 05:45:43,609 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 1.894736842105263) internal successors, (36), 17 states have internal predecessors, (36), 8 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) [2022-12-14 05:45:43,609 INFO L276 IsEmpty]: Start isEmpty. Operand 841 states and 1289 transitions. [2022-12-14 05:45:43,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-12-14 05:45:43,610 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:45:43,610 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:45:43,614 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-12-14 05:45:43,810 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-12-14 05:45:43,812 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:45:43,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:45:43,813 INFO L85 PathProgramCache]: Analyzing trace with hash 50382937, now seen corresponding path program 2 times [2022-12-14 05:45:43,813 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:45:43,813 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1754455349] [2022-12-14 05:45:43,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:45:43,814 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:45:43,833 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 05:45:43,833 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1557867171] [2022-12-14 05:45:43,833 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 05:45:43,833 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:45:43,833 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:45:43,834 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:45:43,835 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-12-14 05:45:43,869 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 05:45:43,869 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 05:45:43,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 05:45:43,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:45:43,899 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 45 proven. 5 refuted. 0 times theorem prover too weak. 122 trivial. 0 not checked. [2022-12-14 05:45:43,899 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:45:43,934 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 45 proven. 5 refuted. 0 times theorem prover too weak. 122 trivial. 0 not checked. [2022-12-14 05:45:43,934 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:45:43,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1754455349] [2022-12-14 05:45:43,935 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 05:45:43,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1557867171] [2022-12-14 05:45:43,935 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1557867171] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 05:45:43,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1327967464] [2022-12-14 05:45:43,937 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 05:45:43,937 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:45:43,937 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:45:43,937 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:45:43,937 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:45:47,789 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-12-14 05:45:47,792 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 65 for LOIs [2022-12-14 05:45:47,807 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:45:57,009 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14600#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 05:45:57,009 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 05:45:57,009 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 05:45:57,009 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2022-12-14 05:45:57,009 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1694617127] [2022-12-14 05:45:57,009 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 05:45:57,009 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-12-14 05:45:57,009 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:45:57,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-12-14 05:45:57,010 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=596, Unknown=0, NotChecked=0, Total=702 [2022-12-14 05:45:57,010 INFO L87 Difference]: Start difference. First operand 841 states and 1289 transitions. Second operand has 8 states, 8 states have (on average 4.0) internal successors, (32), 8 states have internal predecessors, (32), 3 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-12-14 05:45:58,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:45:58,664 INFO L93 Difference]: Finished difference Result 1000 states and 1536 transitions. [2022-12-14 05:45:58,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-12-14 05:45:58,665 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 8 states have internal predecessors, (32), 3 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 79 [2022-12-14 05:45:58,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:45:58,668 INFO L225 Difference]: With dead ends: 1000 [2022-12-14 05:45:58,668 INFO L226 Difference]: Without dead ends: 993 [2022-12-14 05:45:58,669 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 207 SyntacticMatches, 6 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 292 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=186, Invalid=1220, Unknown=0, NotChecked=0, Total=1406 [2022-12-14 05:45:58,669 INFO L413 NwaCegarLoop]: 67 mSDtfsCounter, 58 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 259 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 215 SdHoareTripleChecker+Invalid, 323 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 259 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 05:45:58,669 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [62 Valid, 215 Invalid, 323 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 259 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 05:45:58,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 993 states. [2022-12-14 05:45:59,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 993 to 796. [2022-12-14 05:45:59,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 796 states, 414 states have (on average 1.2777777777777777) internal successors, (529), 417 states have internal predecessors, (529), 351 states have call successors, (351), 30 states have call predecessors, (351), 30 states have return successors, (350), 348 states have call predecessors, (350), 350 states have call successors, (350) [2022-12-14 05:45:59,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 796 states to 796 states and 1230 transitions. [2022-12-14 05:45:59,653 INFO L78 Accepts]: Start accepts. Automaton has 796 states and 1230 transitions. Word has length 79 [2022-12-14 05:45:59,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:45:59,653 INFO L495 AbstractCegarLoop]: Abstraction has 796 states and 1230 transitions. [2022-12-14 05:45:59,653 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 8 states have internal predecessors, (32), 3 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-12-14 05:45:59,653 INFO L276 IsEmpty]: Start isEmpty. Operand 796 states and 1230 transitions. [2022-12-14 05:45:59,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-12-14 05:45:59,654 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:45:59,654 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:45:59,658 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-12-14 05:45:59,855 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-12-14 05:45:59,856 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:45:59,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:45:59,858 INFO L85 PathProgramCache]: Analyzing trace with hash -372759868, now seen corresponding path program 2 times [2022-12-14 05:45:59,858 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:45:59,858 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1551209823] [2022-12-14 05:45:59,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:45:59,859 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:45:59,867 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 05:45:59,867 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [710266002] [2022-12-14 05:45:59,867 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 05:45:59,867 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:45:59,867 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:45:59,868 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:45:59,869 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-12-14 05:45:59,929 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-12-14 05:45:59,929 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 05:45:59,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 66 conjunts are in the unsatisfiable core [2022-12-14 05:45:59,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:46:00,676 INFO L134 CoverageAnalysis]: Checked inductivity of 317 backedges. 24 proven. 28 refuted. 0 times theorem prover too weak. 265 trivial. 0 not checked. [2022-12-14 05:46:00,676 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:46:02,993 INFO L134 CoverageAnalysis]: Checked inductivity of 317 backedges. 24 proven. 27 refuted. 0 times theorem prover too weak. 266 trivial. 0 not checked. [2022-12-14 05:46:02,993 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:46:02,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1551209823] [2022-12-14 05:46:02,993 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 05:46:02,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [710266002] [2022-12-14 05:46:02,993 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [710266002] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 05:46:02,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [497892265] [2022-12-14 05:46:02,995 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 05:46:02,995 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:46:02,995 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:46:02,996 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:46:02,996 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:46:08,536 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-12-14 05:46:08,539 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 65 for LOIs [2022-12-14 05:46:08,552 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:46:52,920 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18176#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 05:46:52,920 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 05:46:52,920 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 05:46:52,920 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15] total 30 [2022-12-14 05:46:52,920 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550601442] [2022-12-14 05:46:52,920 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 05:46:52,921 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-12-14 05:46:52,921 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:46:52,921 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-12-14 05:46:52,922 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=266, Invalid=1893, Unknown=3, NotChecked=0, Total=2162 [2022-12-14 05:46:52,922 INFO L87 Difference]: Start difference. First operand 796 states and 1230 transitions. Second operand has 30 states, 26 states have (on average 2.0) internal successors, (52), 27 states have internal predecessors, (52), 11 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (28), 8 states have call predecessors, (28), 9 states have call successors, (28) [2022-12-14 05:47:10,055 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:47:12,468 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:47:18,506 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.49s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:47:36,548 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.19s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:47:44,515 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:48:04,170 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:48:18,134 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:48:59,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:48:59,602 INFO L93 Difference]: Finished difference Result 1367 states and 2095 transitions. [2022-12-14 05:48:59,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2022-12-14 05:48:59,603 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 26 states have (on average 2.0) internal successors, (52), 27 states have internal predecessors, (52), 11 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (28), 8 states have call predecessors, (28), 9 states have call successors, (28) Word has length 91 [2022-12-14 05:48:59,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:48:59,606 INFO L225 Difference]: With dead ends: 1367 [2022-12-14 05:48:59,606 INFO L226 Difference]: Without dead ends: 1128 [2022-12-14 05:48:59,609 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 347 GetRequests, 213 SyntacticMatches, 13 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5264 ImplicationChecksByTransitivity, 124.3s TimeCoverageRelationStatistics Valid=2274, Invalid=12729, Unknown=3, NotChecked=0, Total=15006 [2022-12-14 05:48:59,609 INFO L413 NwaCegarLoop]: 100 mSDtfsCounter, 297 mSDsluCounter, 618 mSDsCounter, 0 mSdLazyCounter, 2241 mSolverCounterSat, 621 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 46.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 305 SdHoareTripleChecker+Valid, 718 SdHoareTripleChecker+Invalid, 2868 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 621 IncrementalHoareTripleChecker+Valid, 2241 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 47.0s IncrementalHoareTripleChecker+Time [2022-12-14 05:48:59,609 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [305 Valid, 718 Invalid, 2868 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [621 Valid, 2241 Invalid, 6 Unknown, 0 Unchecked, 47.0s Time] [2022-12-14 05:48:59,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1128 states. [2022-12-14 05:49:00,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1128 to 953. [2022-12-14 05:49:00,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 953 states, 497 states have (on average 1.2736418511066399) internal successors, (633), 500 states have internal predecessors, (633), 419 states have call successors, (419), 36 states have call predecessors, (419), 36 states have return successors, (418), 416 states have call predecessors, (418), 418 states have call successors, (418) [2022-12-14 05:49:00,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 953 states to 953 states and 1470 transitions. [2022-12-14 05:49:00,857 INFO L78 Accepts]: Start accepts. Automaton has 953 states and 1470 transitions. Word has length 91 [2022-12-14 05:49:00,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:49:00,857 INFO L495 AbstractCegarLoop]: Abstraction has 953 states and 1470 transitions. [2022-12-14 05:49:00,858 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 26 states have (on average 2.0) internal successors, (52), 27 states have internal predecessors, (52), 11 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (28), 8 states have call predecessors, (28), 9 states have call successors, (28) [2022-12-14 05:49:00,858 INFO L276 IsEmpty]: Start isEmpty. Operand 953 states and 1470 transitions. [2022-12-14 05:49:00,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2022-12-14 05:49:00,859 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:49:00,859 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:49:00,865 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-12-14 05:49:01,059 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-12-14 05:49:01,060 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:49:01,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:49:01,060 INFO L85 PathProgramCache]: Analyzing trace with hash 1852640491, now seen corresponding path program 1 times [2022-12-14 05:49:01,060 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:49:01,060 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1576619756] [2022-12-14 05:49:01,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:49:01,060 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:49:01,069 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 05:49:01,069 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [830634351] [2022-12-14 05:49:01,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:49:01,069 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:49:01,069 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:49:01,070 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:49:01,071 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-12-14 05:49:01,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:49:01,137 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 86 conjunts are in the unsatisfiable core [2022-12-14 05:49:01,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:49:02,001 INFO L134 CoverageAnalysis]: Checked inductivity of 395 backedges. 61 proven. 57 refuted. 0 times theorem prover too weak. 277 trivial. 0 not checked. [2022-12-14 05:49:02,001 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:49:06,724 INFO L134 CoverageAnalysis]: Checked inductivity of 395 backedges. 62 proven. 55 refuted. 0 times theorem prover too weak. 278 trivial. 0 not checked. [2022-12-14 05:49:06,724 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:49:06,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1576619756] [2022-12-14 05:49:06,724 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 05:49:06,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [830634351] [2022-12-14 05:49:06,724 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [830634351] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 05:49:06,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [159679361] [2022-12-14 05:49:06,726 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 05:49:06,726 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:49:06,726 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:49:06,726 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:49:06,726 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:49:10,677 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-12-14 05:49:10,680 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 65 for LOIs [2022-12-14 05:49:10,692 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:49:50,111 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22821#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 05:49:50,112 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 05:49:50,112 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 05:49:50,112 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18] total 36 [2022-12-14 05:49:50,112 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [578522790] [2022-12-14 05:49:50,112 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 05:49:50,112 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-12-14 05:49:50,112 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:49:50,113 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-12-14 05:49:50,113 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=359, Invalid=2292, Unknown=1, NotChecked=0, Total=2652 [2022-12-14 05:49:50,113 INFO L87 Difference]: Start difference. First operand 953 states and 1470 transitions. Second operand has 36 states, 33 states have (on average 2.1818181818181817) internal successors, (72), 32 states have internal predecessors, (72), 12 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 10 states have call predecessors, (30), 10 states have call successors, (30) [2022-12-14 05:49:57,759 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:50:01,450 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:50:03,498 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:50:06,051 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:50:25,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:50:25,092 INFO L93 Difference]: Finished difference Result 1165 states and 1755 transitions. [2022-12-14 05:50:25,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-12-14 05:50:25,094 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 33 states have (on average 2.1818181818181817) internal successors, (72), 32 states have internal predecessors, (72), 12 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 10 states have call predecessors, (30), 10 states have call successors, (30) Word has length 104 [2022-12-14 05:50:25,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:50:25,097 INFO L225 Difference]: With dead ends: 1165 [2022-12-14 05:50:25,097 INFO L226 Difference]: Without dead ends: 1163 [2022-12-14 05:50:25,098 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 351 GetRequests, 242 SyntacticMatches, 18 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3358 ImplicationChecksByTransitivity, 53.3s TimeCoverageRelationStatistics Valid=1354, Invalid=7201, Unknown=1, NotChecked=0, Total=8556 [2022-12-14 05:50:25,099 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 266 mSDsluCounter, 326 mSDsCounter, 0 mSdLazyCounter, 2603 mSolverCounterSat, 540 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 21.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 266 SdHoareTripleChecker+Valid, 367 SdHoareTripleChecker+Invalid, 3147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 540 IncrementalHoareTripleChecker+Valid, 2603 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.3s IncrementalHoareTripleChecker+Time [2022-12-14 05:50:25,099 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [266 Valid, 367 Invalid, 3147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [540 Valid, 2603 Invalid, 4 Unknown, 0 Unchecked, 21.3s Time] [2022-12-14 05:50:25,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1163 states. [2022-12-14 05:50:26,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1163 to 1132. [2022-12-14 05:50:26,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1132 states, 602 states have (on average 1.2574750830564785) internal successors, (757), 609 states have internal predecessors, (757), 483 states have call successors, (483), 46 states have call predecessors, (483), 46 states have return successors, (482), 476 states have call predecessors, (482), 482 states have call successors, (482) [2022-12-14 05:50:26,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1132 states to 1132 states and 1722 transitions. [2022-12-14 05:50:26,730 INFO L78 Accepts]: Start accepts. Automaton has 1132 states and 1722 transitions. Word has length 104 [2022-12-14 05:50:26,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:50:26,730 INFO L495 AbstractCegarLoop]: Abstraction has 1132 states and 1722 transitions. [2022-12-14 05:50:26,730 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 33 states have (on average 2.1818181818181817) internal successors, (72), 32 states have internal predecessors, (72), 12 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 10 states have call predecessors, (30), 10 states have call successors, (30) [2022-12-14 05:50:26,730 INFO L276 IsEmpty]: Start isEmpty. Operand 1132 states and 1722 transitions. [2022-12-14 05:50:26,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2022-12-14 05:50:26,732 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:50:26,732 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:50:26,737 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-12-14 05:50:26,932 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-12-14 05:50:26,933 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:50:26,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:50:26,933 INFO L85 PathProgramCache]: Analyzing trace with hash -1040462752, now seen corresponding path program 3 times [2022-12-14 05:50:26,933 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:50:26,933 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1114899245] [2022-12-14 05:50:26,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:50:26,933 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:50:26,939 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 05:50:26,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2102614362] [2022-12-14 05:50:26,939 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 05:50:26,939 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:50:26,939 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:50:26,940 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:50:26,941 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-12-14 05:50:27,003 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 05:50:27,003 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 05:50:27,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 92 conjunts are in the unsatisfiable core [2022-12-14 05:50:27,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:50:27,894 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 70 proven. 64 refuted. 0 times theorem prover too weak. 436 trivial. 0 not checked. [2022-12-14 05:50:27,894 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:50:42,118 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 70 proven. 63 refuted. 0 times theorem prover too weak. 437 trivial. 0 not checked. [2022-12-14 05:50:42,118 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:50:42,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1114899245] [2022-12-14 05:50:42,118 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 05:50:42,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2102614362] [2022-12-14 05:50:42,118 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2102614362] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 05:50:42,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [70904765] [2022-12-14 05:50:42,120 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 05:50:42,120 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:50:42,120 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:50:42,120 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:50:42,121 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:50:46,942 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-12-14 05:50:46,945 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 65 for LOIs [2022-12-14 05:50:46,961 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:51:25,035 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27424#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 05:51:25,035 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 05:51:25,035 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 05:51:25,035 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 19] total 37 [2022-12-14 05:51:25,035 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [286679021] [2022-12-14 05:51:25,035 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 05:51:25,036 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-12-14 05:51:25,036 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:51:25,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-12-14 05:51:25,037 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=344, Invalid=2518, Unknown=0, NotChecked=0, Total=2862 [2022-12-14 05:51:25,037 INFO L87 Difference]: Start difference. First operand 1132 states and 1722 transitions. Second operand has 37 states, 34 states have (on average 2.0588235294117645) internal successors, (70), 35 states have internal predecessors, (70), 13 states have call successors, (37), 3 states have call predecessors, (37), 3 states have return successors, (36), 11 states have call predecessors, (36), 11 states have call successors, (36) [2022-12-14 05:51:43,388 WARN L233 SmtUtils]: Spent 8.50s on a formula simplification that was a NOOP. DAG size: 112 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 05:51:46,419 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:51:49,542 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:51:58,610 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:52:00,613 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:52:02,617 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:52:04,619 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:52:05,936 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.30s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:52:11,183 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 5.23s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:52:16,322 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:52:25,119 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:52:33,647 WARN L233 SmtUtils]: Spent 5.21s on a formula simplification that was a NOOP. DAG size: 115 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 05:52:37,933 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:52:42,924 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:52:44,926 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:52:46,928 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:52:59,861 WARN L233 SmtUtils]: Spent 5.77s on a formula simplification that was a NOOP. DAG size: 110 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 05:53:03,129 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:53:05,130 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:53:07,133 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:53:10,006 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.28s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:53:25,439 WARN L233 SmtUtils]: Spent 7.90s on a formula simplification that was a NOOP. DAG size: 113 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 05:53:28,089 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.61s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:53:32,235 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:53:42,262 WARN L233 SmtUtils]: Spent 8.81s on a formula simplification that was a NOOP. DAG size: 122 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 05:53:43,491 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.22s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:53:48,093 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:53:50,108 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:53:52,111 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:53:54,342 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:53:59,793 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:54:07,291 WARN L233 SmtUtils]: Spent 6.58s on a formula simplification that was a NOOP. DAG size: 124 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 05:54:34,063 WARN L233 SmtUtils]: Spent 15.16s on a formula simplification. DAG size of input: 117 DAG size of output: 115 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 05:54:36,006 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.32s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:54:42,867 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.23s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:54:56,795 WARN L233 SmtUtils]: Spent 8.12s on a formula simplification that was a NOOP. DAG size: 106 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 05:55:01,222 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:55:08,603 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.11s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-12-14 05:55:22,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 05:55:22,965 INFO L93 Difference]: Finished difference Result 1425 states and 2137 transitions. [2022-12-14 05:55:22,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2022-12-14 05:55:22,966 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 34 states have (on average 2.0588235294117645) internal successors, (70), 35 states have internal predecessors, (70), 13 states have call successors, (37), 3 states have call predecessors, (37), 3 states have return successors, (36), 11 states have call predecessors, (36), 11 states have call successors, (36) Word has length 118 [2022-12-14 05:55:22,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 05:55:22,970 INFO L225 Difference]: With dead ends: 1425 [2022-12-14 05:55:22,970 INFO L226 Difference]: Without dead ends: 1417 [2022-12-14 05:55:22,972 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 425 GetRequests, 287 SyntacticMatches, 13 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5506 ImplicationChecksByTransitivity, 175.1s TimeCoverageRelationStatistics Valid=2418, Invalid=13582, Unknown=2, NotChecked=0, Total=16002 [2022-12-14 05:55:22,972 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 371 mSDsluCounter, 426 mSDsCounter, 0 mSdLazyCounter, 3630 mSolverCounterSat, 766 mSolverCounterUnsat, 24 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 103.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 371 SdHoareTripleChecker+Valid, 484 SdHoareTripleChecker+Invalid, 4420 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 766 IncrementalHoareTripleChecker+Valid, 3630 IncrementalHoareTripleChecker+Invalid, 24 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 104.0s IncrementalHoareTripleChecker+Time [2022-12-14 05:55:22,972 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [371 Valid, 484 Invalid, 4420 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [766 Valid, 3630 Invalid, 24 Unknown, 0 Unchecked, 104.0s Time] [2022-12-14 05:55:22,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1417 states. [2022-12-14 05:55:25,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1417 to 1330. [2022-12-14 05:55:25,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1330 states, 713 states have (on average 1.262272089761571) internal successors, (900), 720 states have internal predecessors, (900), 563 states have call successors, (563), 53 states have call predecessors, (563), 53 states have return successors, (562), 556 states have call predecessors, (562), 562 states have call successors, (562) [2022-12-14 05:55:25,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1330 states to 1330 states and 2025 transitions. [2022-12-14 05:55:25,804 INFO L78 Accepts]: Start accepts. Automaton has 1330 states and 2025 transitions. Word has length 118 [2022-12-14 05:55:25,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 05:55:25,804 INFO L495 AbstractCegarLoop]: Abstraction has 1330 states and 2025 transitions. [2022-12-14 05:55:25,804 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 34 states have (on average 2.0588235294117645) internal successors, (70), 35 states have internal predecessors, (70), 13 states have call successors, (37), 3 states have call predecessors, (37), 3 states have return successors, (36), 11 states have call predecessors, (36), 11 states have call successors, (36) [2022-12-14 05:55:25,804 INFO L276 IsEmpty]: Start isEmpty. Operand 1330 states and 2025 transitions. [2022-12-14 05:55:25,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2022-12-14 05:55:25,806 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 05:55:25,806 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 05:55:25,811 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2022-12-14 05:55:26,006 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:55:26,007 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 05:55:26,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 05:55:26,009 INFO L85 PathProgramCache]: Analyzing trace with hash -642396792, now seen corresponding path program 4 times [2022-12-14 05:55:26,009 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 05:55:26,010 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1935961878] [2022-12-14 05:55:26,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 05:55:26,010 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 05:55:26,044 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-12-14 05:55:26,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1957030584] [2022-12-14 05:55:26,045 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 05:55:26,045 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 05:55:26,045 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 05:55:26,047 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 05:55:26,048 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4b4638e0-a9a4-472e-bea7-257f89fa915c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-12-14 05:55:26,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 05:55:26,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 93 conjunts are in the unsatisfiable core [2022-12-14 05:55:26,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 05:55:27,438 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 70 proven. 64 refuted. 0 times theorem prover too weak. 436 trivial. 0 not checked. [2022-12-14 05:55:27,438 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 05:55:33,823 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 70 proven. 63 refuted. 0 times theorem prover too weak. 437 trivial. 0 not checked. [2022-12-14 05:55:33,823 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 05:55:33,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1935961878] [2022-12-14 05:55:33,823 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-12-14 05:55:33,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1957030584] [2022-12-14 05:55:33,823 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1957030584] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 05:55:33,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1218937256] [2022-12-14 05:55:33,825 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-12-14 05:55:33,825 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 05:55:33,825 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 05:55:33,825 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 05:55:33,825 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 05:55:38,735 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-12-14 05:55:38,738 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 65 for LOIs [2022-12-14 05:55:38,753 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 05:56:19,295 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32830#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 05:56:19,295 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 05:56:19,295 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 05:56:19,296 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 19] total 38 [2022-12-14 05:56:19,296 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426610385] [2022-12-14 05:56:19,296 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 05:56:19,296 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-12-14 05:56:19,297 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 05:56:19,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-12-14 05:56:19,298 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=360, Invalid=2608, Unknown=2, NotChecked=0, Total=2970 [2022-12-14 05:56:19,298 INFO L87 Difference]: Start difference. First operand 1330 states and 2025 transitions. Second operand has 38 states, 34 states have (on average 2.088235294117647) internal successors, (71), 35 states have internal predecessors, (71), 14 states have call successors, (38), 3 states have call predecessors, (38), 3 states have return successors, (36), 11 states have call predecessors, (36), 12 states have call successors, (36)