./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version b5237d83 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 436f0a1b9da8affd8e76edc25dee0cffff5a08ff489ec96067821d6a4548518b --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-b5237d8 [2022-11-22 02:19:41,811 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-22 02:19:41,814 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-22 02:19:41,863 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-22 02:19:41,863 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-22 02:19:41,867 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-22 02:19:41,869 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-22 02:19:41,872 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-22 02:19:41,875 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-22 02:19:41,880 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-22 02:19:41,881 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-22 02:19:41,882 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-22 02:19:41,882 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-22 02:19:41,883 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-22 02:19:41,884 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-22 02:19:41,885 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-22 02:19:41,886 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-22 02:19:41,887 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-22 02:19:41,889 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-22 02:19:41,894 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-22 02:19:41,897 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-22 02:19:41,900 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-22 02:19:41,901 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-22 02:19:41,902 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-22 02:19:41,917 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-22 02:19:41,917 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-22 02:19:41,917 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-22 02:19:41,920 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-22 02:19:41,920 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-22 02:19:41,921 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-22 02:19:41,922 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-22 02:19:41,923 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-22 02:19:41,924 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-22 02:19:41,925 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-22 02:19:41,927 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-22 02:19:41,927 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-22 02:19:41,928 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-22 02:19:41,928 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-22 02:19:41,929 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-22 02:19:41,930 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-22 02:19:41,932 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-22 02:19:41,933 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-22 02:19:41,971 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-22 02:19:41,972 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-22 02:19:41,972 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-22 02:19:41,973 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-22 02:19:41,974 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-22 02:19:41,974 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-22 02:19:41,974 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-22 02:19:41,975 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-22 02:19:41,975 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-22 02:19:41,975 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-22 02:19:41,976 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-22 02:19:41,977 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-22 02:19:41,977 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-22 02:19:41,977 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-22 02:19:41,977 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-22 02:19:41,978 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-22 02:19:41,978 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-22 02:19:41,978 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-22 02:19:41,979 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-22 02:19:41,979 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-22 02:19:41,980 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-22 02:19:41,980 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-22 02:19:41,980 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-22 02:19:41,980 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-22 02:19:41,981 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-22 02:19:41,981 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-22 02:19:41,982 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-22 02:19:41,982 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-22 02:19:41,982 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-22 02:19:41,982 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-22 02:19:41,983 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-22 02:19:41,983 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-22 02:19:41,983 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 02:19:41,984 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-22 02:19:41,984 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-22 02:19:41,984 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-22 02:19:41,985 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-22 02:19:41,985 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-22 02:19:41,985 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-22 02:19:41,985 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-22 02:19:41,986 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-22 02:19:41,986 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_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 436f0a1b9da8affd8e76edc25dee0cffff5a08ff489ec96067821d6a4548518b [2022-11-22 02:19:42,327 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-22 02:19:42,367 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-22 02:19:42,369 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-22 02:19:42,371 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-22 02:19:42,371 INFO L275 PluginConnector]: CDTParser initialized [2022-11-22 02:19:42,373 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c [2022-11-22 02:19:45,605 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-22 02:19:45,855 INFO L351 CDTParser]: Found 1 translation units. [2022-11-22 02:19:45,856 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c [2022-11-22 02:19:45,865 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/data/2fc24160d/ca00e0327eea4f57b0747f1c72d33fe1/FLAGc26de5437 [2022-11-22 02:19:45,885 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/data/2fc24160d/ca00e0327eea4f57b0747f1c72d33fe1 [2022-11-22 02:19:45,888 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-22 02:19:45,890 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-22 02:19:45,895 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-22 02:19:45,895 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-22 02:19:45,899 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-22 02:19:45,900 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 02:19:45" (1/1) ... [2022-11-22 02:19:45,901 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6f3159e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:19:45, skipping insertion in model container [2022-11-22 02:19:45,902 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 02:19:45" (1/1) ... [2022-11-22 02:19:45,909 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-22 02:19:45,929 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-22 02:19:46,118 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_801002bd-8be0-44b4-9bc6-485efa8eac10/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c[490,503] [2022-11-22 02:19:46,158 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 02:19:46,169 INFO L203 MainTranslator]: Completed pre-run [2022-11-22 02:19:46,189 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_801002bd-8be0-44b4-9bc6-485efa8eac10/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_unwindbound50.c[490,503] [2022-11-22 02:19:46,217 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 02:19:46,236 INFO L208 MainTranslator]: Completed translation [2022-11-22 02:19:46,237 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:19:46 WrapperNode [2022-11-22 02:19:46,237 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-22 02:19:46,239 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-22 02:19:46,239 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-22 02:19:46,239 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-22 02:19:46,248 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:19:46" (1/1) ... [2022-11-22 02:19:46,256 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:19:46" (1/1) ... [2022-11-22 02:19:46,286 INFO L138 Inliner]: procedures = 14, calls = 14, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 91 [2022-11-22 02:19:46,287 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-22 02:19:46,288 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-22 02:19:46,288 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-22 02:19:46,288 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-22 02:19:46,299 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:19:46" (1/1) ... [2022-11-22 02:19:46,300 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:19:46" (1/1) ... [2022-11-22 02:19:46,312 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:19:46" (1/1) ... [2022-11-22 02:19:46,313 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:19:46" (1/1) ... [2022-11-22 02:19:46,321 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:19:46" (1/1) ... [2022-11-22 02:19:46,333 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:19:46" (1/1) ... [2022-11-22 02:19:46,334 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:19:46" (1/1) ... [2022-11-22 02:19:46,335 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:19:46" (1/1) ... [2022-11-22 02:19:46,337 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-22 02:19:46,340 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-22 02:19:46,341 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-22 02:19:46,341 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-22 02:19:46,342 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:19:46" (1/1) ... [2022-11-22 02:19:46,349 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 02:19:46,361 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:19:46,385 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-22 02:19:46,395 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-22 02:19:46,437 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-22 02:19:46,437 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-22 02:19:46,437 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-22 02:19:46,438 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-22 02:19:46,438 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-22 02:19:46,438 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-22 02:19:46,439 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-22 02:19:46,439 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-22 02:19:46,521 INFO L235 CfgBuilder]: Building ICFG [2022-11-22 02:19:46,524 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-22 02:19:46,750 INFO L276 CfgBuilder]: Performing block encoding [2022-11-22 02:19:46,774 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-22 02:19:46,774 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-22 02:19:46,777 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 02:19:46 BoogieIcfgContainer [2022-11-22 02:19:46,778 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-22 02:19:46,780 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-22 02:19:46,781 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-22 02:19:46,785 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-22 02:19:46,785 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 02:19:45" (1/3) ... [2022-11-22 02:19:46,786 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d4fcaf9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 02:19:46, skipping insertion in model container [2022-11-22 02:19:46,786 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:19:46" (2/3) ... [2022-11-22 02:19:46,787 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d4fcaf9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 02:19:46, skipping insertion in model container [2022-11-22 02:19:46,787 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 02:19:46" (3/3) ... [2022-11-22 02:19:46,788 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd3-ll_unwindbound50.c [2022-11-22 02:19:46,811 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-22 02:19:46,811 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-22 02:19:46,872 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-22 02:19:46,889 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;@60fe650b, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-22 02:19:46,889 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-22 02:19:46,894 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 20 states have internal predecessors, (30), 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) [2022-11-22 02:19:46,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-22 02:19:46,911 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:19:46,912 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:19:46,912 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:19:46,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:19:46,920 INFO L85 PathProgramCache]: Analyzing trace with hash 1826888722, now seen corresponding path program 1 times [2022-11-22 02:19:46,929 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:19:46,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1888262339] [2022-11-22 02:19:46,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:19:46,931 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:19:47,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:19:47,161 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:19:47,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1888262339] [2022-11-22 02:19:47,162 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-22 02:19:47,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2066956202] [2022-11-22 02:19:47,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:19:47,163 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:19:47,163 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:19:47,168 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:19:47,191 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-22 02:19:47,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:19:47,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-22 02:19:47,292 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:19:47,323 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 02:19:47,324 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 02:19:47,325 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2066956202] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:19:47,325 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:19:47,326 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-22 02:19:47,329 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784220539] [2022-11-22 02:19:47,330 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:19:47,335 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-22 02:19:47,335 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:19:47,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-22 02:19:47,382 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-22 02:19:47,385 INFO L87 Difference]: Start difference. First operand has 30 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 20 states have internal predecessors, (30), 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) [2022-11-22 02:19:47,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:19:47,438 INFO L93 Difference]: Finished difference Result 54 states and 86 transitions. [2022-11-22 02:19:47,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-22 02:19:47,441 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 [2022-11-22 02:19:47,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:19:47,448 INFO L225 Difference]: With dead ends: 54 [2022-11-22 02:19:47,449 INFO L226 Difference]: Without dead ends: 28 [2022-11-22 02:19:47,453 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 [2022-11-22 02:19:47,458 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:19:47,460 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 37 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:19:47,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-22 02:19:47,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-11-22 02:19:47,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 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) [2022-11-22 02:19:47,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions. [2022-11-22 02:19:47,516 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 13 [2022-11-22 02:19:47,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:19:47,519 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 38 transitions. [2022-11-22 02:19:47,520 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) [2022-11-22 02:19:47,520 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions. [2022-11-22 02:19:47,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-22 02:19:47,522 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:19:47,522 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:19:47,534 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-22 02:19:47,729 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-22 02:19:47,729 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:19:47,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:19:47,730 INFO L85 PathProgramCache]: Analyzing trace with hash -828509657, now seen corresponding path program 1 times [2022-11-22 02:19:47,730 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:19:47,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1931299873] [2022-11-22 02:19:47,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:19:47,731 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:19:47,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:19:47,798 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:19:47,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1931299873] [2022-11-22 02:19:47,798 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-22 02:19:47,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1241483645] [2022-11-22 02:19:47,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:19:47,799 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:19:47,799 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:19:47,801 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:19:47,819 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-22 02:19:47,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:19:47,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-22 02:19:47,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:19:47,932 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 02:19:47,933 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 02:19:47,933 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1241483645] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:19:47,933 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:19:47,933 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-22 02:19:47,933 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715494717] [2022-11-22 02:19:47,934 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:19:47,934 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-22 02:19:47,935 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:19:47,935 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-22 02:19:47,935 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-22 02:19:47,936 INFO L87 Difference]: Start difference. First operand 28 states and 38 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-22 02:19:47,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:19:47,964 INFO L93 Difference]: Finished difference Result 37 states and 47 transitions. [2022-11-22 02:19:47,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-22 02:19:47,965 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2022-11-22 02:19:47,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:19:47,966 INFO L225 Difference]: With dead ends: 37 [2022-11-22 02:19:47,966 INFO L226 Difference]: Without dead ends: 30 [2022-11-22 02:19:47,967 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-22 02:19:47,968 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 0 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:19:47,969 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 94 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:19:47,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-11-22 02:19:47,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-11-22 02:19:47,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 20 states have (on average 1.35) internal successors, (27), 21 states have internal predecessors, (27), 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) [2022-11-22 02:19:47,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 40 transitions. [2022-11-22 02:19:47,976 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 40 transitions. Word has length 14 [2022-11-22 02:19:47,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:19:47,977 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 40 transitions. [2022-11-22 02:19:47,977 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-22 02:19:47,977 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 40 transitions. [2022-11-22 02:19:47,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-22 02:19:47,978 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:19:47,978 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:19:47,992 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-22 02:19:48,184 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:19:48,185 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:19:48,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:19:48,186 INFO L85 PathProgramCache]: Analyzing trace with hash 66369279, now seen corresponding path program 1 times [2022-11-22 02:19:48,186 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:19:48,186 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1084704181] [2022-11-22 02:19:48,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:19:48,187 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:19:48,204 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:19:48,205 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [119796284] [2022-11-22 02:19:48,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:19:48,205 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:19:48,206 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:19:48,207 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:19:48,218 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-22 02:19:48,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:19:48,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-22 02:19:48,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:19:48,315 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 02:19:48,315 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 02:19:48,315 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:19:48,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1084704181] [2022-11-22 02:19:48,316 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:19:48,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [119796284] [2022-11-22 02:19:48,316 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [119796284] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:19:48,316 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:19:48,317 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-22 02:19:48,317 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975446583] [2022-11-22 02:19:48,317 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:19:48,318 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 02:19:48,318 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:19:48,318 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 02:19:48,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-22 02:19:48,319 INFO L87 Difference]: Start difference. First operand 30 states and 40 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 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) [2022-11-22 02:19:48,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:19:48,422 INFO L93 Difference]: Finished difference Result 50 states and 68 transitions. [2022-11-22 02:19:48,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-22 02:19:48,423 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 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 15 [2022-11-22 02:19:48,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:19:48,424 INFO L225 Difference]: With dead ends: 50 [2022-11-22 02:19:48,424 INFO L226 Difference]: Without dead ends: 43 [2022-11-22 02:19:48,425 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-22 02:19:48,426 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 45 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:19:48,427 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 88 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:19:48,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-11-22 02:19:48,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2022-11-22 02:19:48,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 21 states have (on average 1.3333333333333333) internal successors, (28), 22 states have internal predecessors, (28), 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) [2022-11-22 02:19:48,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 41 transitions. [2022-11-22 02:19:48,435 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 41 transitions. Word has length 15 [2022-11-22 02:19:48,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:19:48,436 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 41 transitions. [2022-11-22 02:19:48,436 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 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) [2022-11-22 02:19:48,436 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 41 transitions. [2022-11-22 02:19:48,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-22 02:19:48,437 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:19:48,437 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:19:48,446 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-22 02:19:48,643 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:19:48,643 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:19:48,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:19:48,644 INFO L85 PathProgramCache]: Analyzing trace with hash -1737104877, now seen corresponding path program 1 times [2022-11-22 02:19:48,645 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:19:48,645 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2066938440] [2022-11-22 02:19:48,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:19:48,645 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:19:48,670 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:19:48,680 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1748764699] [2022-11-22 02:19:48,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:19:48,681 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:19:48,681 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:19:48,682 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:19:48,698 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-22 02:19:48,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:19:48,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-22 02:19:48,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:19:48,795 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 02:19:48,795 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 02:19:48,795 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:19:48,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2066938440] [2022-11-22 02:19:48,795 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:19:48,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1748764699] [2022-11-22 02:19:48,796 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1748764699] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:19:48,796 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:19:48,796 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-22 02:19:48,796 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1887278459] [2022-11-22 02:19:48,796 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:19:48,797 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 02:19:48,797 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:19:48,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 02:19:48,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-22 02:19:48,798 INFO L87 Difference]: Start difference. First operand 31 states and 41 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-22 02:19:48,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:19:48,836 INFO L93 Difference]: Finished difference Result 55 states and 75 transitions. [2022-11-22 02:19:48,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-22 02:19:48,837 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 20 [2022-11-22 02:19:48,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:19:48,838 INFO L225 Difference]: With dead ends: 55 [2022-11-22 02:19:48,838 INFO L226 Difference]: Without dead ends: 33 [2022-11-22 02:19:48,839 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-22 02:19:48,840 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 2 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:19:48,841 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 119 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:19:48,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-11-22 02:19:48,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-11-22 02:19:48,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 24 states have internal predecessors, (30), 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) [2022-11-22 02:19:48,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 43 transitions. [2022-11-22 02:19:48,849 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 43 transitions. Word has length 20 [2022-11-22 02:19:48,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:19:48,849 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 43 transitions. [2022-11-22 02:19:48,849 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-22 02:19:48,850 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 43 transitions. [2022-11-22 02:19:48,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-22 02:19:48,851 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:19:48,851 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:19:48,863 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-22 02:19:49,057 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:19:49,058 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:19:49,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:19:49,058 INFO L85 PathProgramCache]: Analyzing trace with hash 148941760, now seen corresponding path program 1 times [2022-11-22 02:19:49,058 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:19:49,059 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [31677953] [2022-11-22 02:19:49,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:19:49,059 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:19:49,075 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:19:49,075 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [793192441] [2022-11-22 02:19:49,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:19:49,076 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:19:49,076 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:19:49,086 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:19:49,087 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-22 02:19:49,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:19:49,154 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-22 02:19:49,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:19:49,513 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 02:19:49,513 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 02:19:49,513 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:19:49,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [31677953] [2022-11-22 02:19:49,515 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:19:49,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [793192441] [2022-11-22 02:19:49,515 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [793192441] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:19:49,516 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:19:49,516 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-11-22 02:19:49,516 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453537281] [2022-11-22 02:19:49,516 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:19:49,517 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-22 02:19:49,517 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:19:49,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-22 02:19:49,519 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2022-11-22 02:19:49,519 INFO L87 Difference]: Start difference. First operand 33 states and 43 transitions. Second operand has 8 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 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) [2022-11-22 02:19:49,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:19:49,681 INFO L93 Difference]: Finished difference Result 51 states and 68 transitions. [2022-11-22 02:19:49,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-22 02:19:49,682 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 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 20 [2022-11-22 02:19:49,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:19:49,686 INFO L225 Difference]: With dead ends: 51 [2022-11-22 02:19:49,687 INFO L226 Difference]: Without dead ends: 49 [2022-11-22 02:19:49,687 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2022-11-22 02:19:49,690 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 71 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:19:49,691 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 131 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:19:49,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-11-22 02:19:49,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2022-11-22 02:19:49,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 33 states have (on average 1.3333333333333333) internal successors, (44), 34 states have internal predecessors, (44), 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) [2022-11-22 02:19:49,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 65 transitions. [2022-11-22 02:19:49,705 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 65 transitions. Word has length 20 [2022-11-22 02:19:49,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:19:49,705 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 65 transitions. [2022-11-22 02:19:49,706 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 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) [2022-11-22 02:19:49,706 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 65 transitions. [2022-11-22 02:19:49,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-22 02:19:49,707 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:19:49,707 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:19:49,719 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-22 02:19:49,919 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:19:49,920 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:19:49,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:19:49,921 INFO L85 PathProgramCache]: Analyzing trace with hash -1894324762, now seen corresponding path program 1 times [2022-11-22 02:19:49,921 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:19:49,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1839596499] [2022-11-22 02:19:49,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:19:49,921 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:19:49,938 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:19:49,953 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1459694666] [2022-11-22 02:19:49,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:19:49,953 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:19:49,954 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:19:49,955 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:19:49,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-22 02:19:50,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:19:50,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-22 02:19:50,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:19:50,087 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 02:19:50,088 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:19:50,189 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 02:19:50,190 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:19:50,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1839596499] [2022-11-22 02:19:50,190 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:19:50,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1459694666] [2022-11-22 02:19:50,191 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1459694666] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:19:50,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1271114460] [2022-11-22 02:19:50,212 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-22 02:19:50,213 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:19:50,216 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:19:50,222 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:19:50,223 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:19:51,209 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 02:19:51,261 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:19:54,268 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1271114460] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:19:54,269 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:19:54,269 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [5, 6] total 22 [2022-11-22 02:19:54,269 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [228537012] [2022-11-22 02:19:54,270 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:19:54,270 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-22 02:19:54,270 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:19:54,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-22 02:19:54,271 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=345, Unknown=0, NotChecked=0, Total=462 [2022-11-22 02:19:54,272 INFO L87 Difference]: Start difference. First operand 48 states and 65 transitions. Second operand has 14 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-22 02:19:56,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:19:56,251 INFO L93 Difference]: Finished difference Result 88 states and 125 transitions. [2022-11-22 02:19:56,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-22 02:19:56,253 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 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 21 [2022-11-22 02:19:56,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:19:56,254 INFO L225 Difference]: With dead ends: 88 [2022-11-22 02:19:56,255 INFO L226 Difference]: Without dead ends: 66 [2022-11-22 02:19:56,255 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=176, Invalid=580, Unknown=0, NotChecked=0, Total=756 [2022-11-22 02:19:56,256 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 18 mSDsluCounter, 118 mSDsCounter, 0 mSdLazyCounter, 247 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 247 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 02:19:56,256 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 145 Invalid, 256 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 247 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 02:19:56,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-11-22 02:19:56,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 56. [2022-11-22 02:19:56,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 41 states have (on average 1.3170731707317074) internal successors, (54), 42 states have internal predecessors, (54), 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) [2022-11-22 02:19:56,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 75 transitions. [2022-11-22 02:19:56,276 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 75 transitions. Word has length 21 [2022-11-22 02:19:56,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:19:56,277 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 75 transitions. [2022-11-22 02:19:56,277 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-22 02:19:56,277 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 75 transitions. [2022-11-22 02:19:56,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-22 02:19:56,278 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:19:56,278 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, 1, 1, 1] [2022-11-22 02:19:56,287 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-11-22 02:19:56,483 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:19:56,484 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:19:56,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:19:56,484 INFO L85 PathProgramCache]: Analyzing trace with hash -1377591568, now seen corresponding path program 1 times [2022-11-22 02:19:56,484 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:19:56,484 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [197592881] [2022-11-22 02:19:56,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:19:56,485 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:19:56,499 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:19:56,503 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [34181634] [2022-11-22 02:19:56,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:19:56,504 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:19:56,504 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:19:56,505 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:19:56,527 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-22 02:19:56,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:19:56,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 27 conjunts are in the unsatisfiable core [2022-11-22 02:19:56,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:19:57,008 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 02:19:57,010 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:19:57,146 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:19:57,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [197592881] [2022-11-22 02:19:57,147 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:19:57,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [34181634] [2022-11-22 02:19:57,148 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [34181634] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:19:57,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1812509762] [2022-11-22 02:19:57,152 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2022-11-22 02:19:57,153 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:19:57,153 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:19:57,154 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:19:57,154 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:19:57,509 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2022-11-22 02:19:57,521 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 02:19:57,560 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:20:00,213 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1812509762] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:20:00,213 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-22 02:20:00,214 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [13] total 29 [2022-11-22 02:20:00,214 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1238758036] [2022-11-22 02:20:00,214 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:20:00,215 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-22 02:20:00,215 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:20:00,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-22 02:20:00,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=826, Unknown=0, NotChecked=0, Total=992 [2022-11-22 02:20:00,216 INFO L87 Difference]: Start difference. First operand 56 states and 75 transitions. Second operand has 18 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 13 states have internal predecessors, (16), 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) [2022-11-22 02:20:00,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:20:00,711 INFO L93 Difference]: Finished difference Result 110 states and 150 transitions. [2022-11-22 02:20:00,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-22 02:20:00,711 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 13 states have internal predecessors, (16), 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 25 [2022-11-22 02:20:00,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:20:00,712 INFO L225 Difference]: With dead ends: 110 [2022-11-22 02:20:00,713 INFO L226 Difference]: Without dead ends: 73 [2022-11-22 02:20:00,713 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 21 SyntacticMatches, 3 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 333 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=166, Invalid=826, Unknown=0, NotChecked=0, Total=992 [2022-11-22 02:20:00,714 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 9 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 02:20:00,715 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 123 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 310 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 02:20:00,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-11-22 02:20:00,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2022-11-22 02:20:00,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 49 states have (on average 1.2653061224489797) internal successors, (62), 51 states have internal predecessors, (62), 15 states have call successors, (15), 5 states have call predecessors, (15), 5 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2022-11-22 02:20:00,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 91 transitions. [2022-11-22 02:20:00,763 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 91 transitions. Word has length 25 [2022-11-22 02:20:00,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:20:00,764 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 91 transitions. [2022-11-22 02:20:00,764 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 13 states have internal predecessors, (16), 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) [2022-11-22 02:20:00,765 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 91 transitions. [2022-11-22 02:20:00,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-22 02:20:00,769 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:20:00,769 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:20:00,780 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-22 02:20:00,975 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-22 02:20:00,976 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:20:00,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:20:00,976 INFO L85 PathProgramCache]: Analyzing trace with hash -1856138177, now seen corresponding path program 1 times [2022-11-22 02:20:00,976 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:20:00,976 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1054296101] [2022-11-22 02:20:00,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:20:00,977 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:20:00,989 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:20:00,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [605549289] [2022-11-22 02:20:00,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:20:00,990 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:20:00,990 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:20:00,991 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:20:01,007 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-22 02:20:01,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:20:01,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 29 conjunts are in the unsatisfiable core [2022-11-22 02:20:01,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:20:01,270 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-22 02:20:01,271 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:20:01,375 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-22 02:20:01,375 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:20:01,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1054296101] [2022-11-22 02:20:01,375 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:20:01,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [605549289] [2022-11-22 02:20:01,376 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [605549289] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:20:01,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1960314835] [2022-11-22 02:20:01,380 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-22 02:20:01,381 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:20:01,381 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:20:01,382 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:20:01,382 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:20:02,234 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 53 for LOIs [2022-11-22 02:20:02,251 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 02:20:02,278 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:20:07,152 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1960314835] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:20:07,153 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:20:07,153 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [9, 6] total 30 [2022-11-22 02:20:07,153 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1888430853] [2022-11-22 02:20:07,153 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:20:07,154 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-22 02:20:07,154 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:20:07,155 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-22 02:20:07,155 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=760, Unknown=0, NotChecked=0, Total=870 [2022-11-22 02:20:07,156 INFO L87 Difference]: Start difference. First operand 70 states and 91 transitions. Second operand has 19 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-22 02:20:10,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:20:10,143 INFO L93 Difference]: Finished difference Result 108 states and 145 transitions. [2022-11-22 02:20:10,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-22 02:20:10,144 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 14 states have internal predecessors, (16), 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 27 [2022-11-22 02:20:10,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:20:10,145 INFO L225 Difference]: With dead ends: 108 [2022-11-22 02:20:10,145 INFO L226 Difference]: Without dead ends: 86 [2022-11-22 02:20:10,146 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 288 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=192, Invalid=1290, Unknown=0, NotChecked=0, Total=1482 [2022-11-22 02:20:10,147 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 22 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 495 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 520 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 495 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-22 02:20:10,148 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 154 Invalid, 520 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 495 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-22 02:20:10,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-11-22 02:20:10,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 80. [2022-11-22 02:20:10,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 54 states have (on average 1.2407407407407407) internal successors, (67), 57 states have internal predecessors, (67), 19 states have call successors, (19), 6 states have call predecessors, (19), 6 states have return successors, (18), 16 states have call predecessors, (18), 18 states have call successors, (18) [2022-11-22 02:20:10,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 104 transitions. [2022-11-22 02:20:10,175 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 104 transitions. Word has length 27 [2022-11-22 02:20:10,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:20:10,175 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 104 transitions. [2022-11-22 02:20:10,176 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-22 02:20:10,176 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 104 transitions. [2022-11-22 02:20:10,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-22 02:20:10,177 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:20:10,177 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, 1, 1, 1] [2022-11-22 02:20:10,194 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-22 02:20:10,394 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:20:10,394 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:20:10,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:20:10,395 INFO L85 PathProgramCache]: Analyzing trace with hash -301475410, now seen corresponding path program 1 times [2022-11-22 02:20:10,395 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:20:10,395 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [982137587] [2022-11-22 02:20:10,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:20:10,395 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:20:10,410 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:20:10,410 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [86585107] [2022-11-22 02:20:10,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:20:10,411 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:20:10,411 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:20:10,415 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:20:10,422 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-22 02:20:10,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:20:10,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-22 02:20:10,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:20:10,586 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-22 02:20:10,586 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:20:10,674 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-22 02:20:10,674 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:20:10,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [982137587] [2022-11-22 02:20:10,675 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:20:10,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [86585107] [2022-11-22 02:20:10,675 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [86585107] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:20:10,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1586812671] [2022-11-22 02:20:10,680 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:20:10,680 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:20:10,681 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:20:10,681 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:20:10,681 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:20:18,385 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2022-11-22 02:20:18,395 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 02:20:18,421 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:20:23,267 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1586812671] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:20:23,267 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:20:23,267 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [6, 7] total 29 [2022-11-22 02:20:23,267 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579076894] [2022-11-22 02:20:23,268 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:20:23,268 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-22 02:20:23,268 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:20:23,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-22 02:20:23,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=607, Unknown=0, NotChecked=0, Total=812 [2022-11-22 02:20:23,270 INFO L87 Difference]: Start difference. First operand 80 states and 104 transitions. Second operand has 19 states, 16 states have (on average 1.3125) internal successors, (21), 14 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-11-22 02:20:24,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:20:24,029 INFO L93 Difference]: Finished difference Result 138 states and 185 transitions. [2022-11-22 02:20:24,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-22 02:20:24,030 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 16 states have (on average 1.3125) internal successors, (21), 14 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 47 [2022-11-22 02:20:24,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:20:24,032 INFO L225 Difference]: With dead ends: 138 [2022-11-22 02:20:24,033 INFO L226 Difference]: Without dead ends: 101 [2022-11-22 02:20:24,034 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 100 SyntacticMatches, 12 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 660 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=216, Invalid=654, Unknown=0, NotChecked=0, Total=870 [2022-11-22 02:20:24,034 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 10 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 317 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 317 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 02:20:24,035 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 116 Invalid, 324 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 317 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 02:20:24,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-11-22 02:20:24,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 85. [2022-11-22 02:20:24,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 59 states have (on average 1.2542372881355932) internal successors, (74), 61 states have internal predecessors, (74), 19 states have call successors, (19), 6 states have call predecessors, (19), 6 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2022-11-22 02:20:24,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 111 transitions. [2022-11-22 02:20:24,062 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 111 transitions. Word has length 47 [2022-11-22 02:20:24,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:20:24,062 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 111 transitions. [2022-11-22 02:20:24,063 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 16 states have (on average 1.3125) internal successors, (21), 14 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-11-22 02:20:24,063 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 111 transitions. [2022-11-22 02:20:24,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-22 02:20:24,064 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:20:24,064 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:20:24,070 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-22 02:20:24,270 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:20:24,271 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:20:24,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:20:24,271 INFO L85 PathProgramCache]: Analyzing trace with hash 170701079, now seen corresponding path program 1 times [2022-11-22 02:20:24,271 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:20:24,271 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [105918847] [2022-11-22 02:20:24,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:20:24,271 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:20:24,282 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:20:24,283 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1924698597] [2022-11-22 02:20:24,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:20:24,283 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:20:24,285 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:20:24,286 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:20:24,289 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-22 02:20:24,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:20:24,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-22 02:20:24,361 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:20:24,415 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-22 02:20:24,415 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:20:24,521 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-22 02:20:24,521 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:20:24,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [105918847] [2022-11-22 02:20:24,522 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:20:24,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1924698597] [2022-11-22 02:20:24,522 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1924698597] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:20:24,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [465059453] [2022-11-22 02:20:24,525 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-22 02:20:24,525 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:20:24,526 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:20:24,527 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:20:24,527 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:20:30,524 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 for LOIs [2022-11-22 02:20:30,575 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 02:20:30,600 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:20:33,820 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3013#(and (<= ~counter~0 51) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-22 02:20:33,821 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:20:33,821 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:20:33,821 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2022-11-22 02:20:33,821 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176126778] [2022-11-22 02:20:33,821 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:20:33,822 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-22 02:20:33,822 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:20:33,823 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-22 02:20:33,823 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=820, Unknown=0, NotChecked=0, Total=930 [2022-11-22 02:20:33,823 INFO L87 Difference]: Start difference. First operand 85 states and 111 transitions. Second operand has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-22 02:20:33,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:20:33,991 INFO L93 Difference]: Finished difference Result 105 states and 134 transitions. [2022-11-22 02:20:33,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-22 02:20:33,992 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 48 [2022-11-22 02:20:33,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:20:33,994 INFO L225 Difference]: With dead ends: 105 [2022-11-22 02:20:33,994 INFO L226 Difference]: Without dead ends: 103 [2022-11-22 02:20:33,995 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 278 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=126, Invalid=930, Unknown=0, NotChecked=0, Total=1056 [2022-11-22 02:20:33,996 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 26 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:20:33,996 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 84 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:20:33,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2022-11-22 02:20:34,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 101. [2022-11-22 02:20:34,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 71 states have (on average 1.2535211267605635) internal successors, (89), 74 states have internal predecessors, (89), 21 states have call successors, (21), 8 states have call predecessors, (21), 8 states have return successors, (20), 18 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-22 02:20:34,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 130 transitions. [2022-11-22 02:20:34,026 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 130 transitions. Word has length 48 [2022-11-22 02:20:34,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:20:34,027 INFO L495 AbstractCegarLoop]: Abstraction has 101 states and 130 transitions. [2022-11-22 02:20:34,027 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-22 02:20:34,027 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 130 transitions. [2022-11-22 02:20:34,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-22 02:20:34,029 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:20:34,029 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:20:34,035 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-22 02:20:34,235 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-22 02:20:34,235 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:20:34,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:20:34,236 INFO L85 PathProgramCache]: Analyzing trace with hash -339484245, now seen corresponding path program 1 times [2022-11-22 02:20:34,236 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:20:34,236 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1459470097] [2022-11-22 02:20:34,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:20:34,236 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:20:34,257 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:20:34,263 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1805418874] [2022-11-22 02:20:34,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:20:34,263 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:20:34,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:20:34,268 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:20:34,271 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-22 02:20:34,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:20:34,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-22 02:20:34,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:20:34,414 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-22 02:20:34,414 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:20:34,514 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-22 02:20:34,514 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:20:34,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1459470097] [2022-11-22 02:20:34,515 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:20:34,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1805418874] [2022-11-22 02:20:34,515 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1805418874] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:20:34,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [159368300] [2022-11-22 02:20:34,517 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:20:34,517 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:20:34,518 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:20:34,518 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:20:34,518 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:20:39,870 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-22 02:20:43,634 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2022-11-22 02:20:43,711 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 02:20:43,735 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:21:01,627 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3627#(and (<= ~counter~0 52) (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0))' at error location [2022-11-22 02:21:01,627 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:21:01,627 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:21:01,627 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2022-11-22 02:21:01,627 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [627654255] [2022-11-22 02:21:01,627 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:21:01,628 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-22 02:21:01,628 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:21:01,629 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-22 02:21:01,629 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=1106, Unknown=0, NotChecked=0, Total=1332 [2022-11-22 02:21:01,629 INFO L87 Difference]: Start difference. First operand 101 states and 130 transitions. Second operand has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 14 states have internal predecessors, (47), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-22 02:21:02,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:21:02,122 INFO L93 Difference]: Finished difference Result 508 states and 648 transitions. [2022-11-22 02:21:02,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-22 02:21:02,122 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 14 states have internal predecessors, (47), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 48 [2022-11-22 02:21:02,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:21:02,131 INFO L225 Difference]: With dead ends: 508 [2022-11-22 02:21:02,131 INFO L226 Difference]: Without dead ends: 501 [2022-11-22 02:21:02,132 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 105 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 714 ImplicationChecksByTransitivity, 18.0s TimeCoverageRelationStatistics Valid=302, Invalid=1590, Unknown=0, NotChecked=0, Total=1892 [2022-11-22 02:21:02,133 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 273 mSDsluCounter, 330 mSDsCounter, 0 mSdLazyCounter, 207 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 273 SdHoareTripleChecker+Valid, 392 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 207 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:21:02,134 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [273 Valid, 392 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [114 Valid, 207 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:21:02,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 501 states. [2022-11-22 02:21:02,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 501 to 390. [2022-11-22 02:21:02,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 390 states, 274 states have (on average 1.27007299270073) internal successors, (348), 284 states have internal predecessors, (348), 81 states have call successors, (81), 34 states have call predecessors, (81), 34 states have return successors, (76), 71 states have call predecessors, (76), 76 states have call successors, (76) [2022-11-22 02:21:02,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 390 states to 390 states and 505 transitions. [2022-11-22 02:21:02,236 INFO L78 Accepts]: Start accepts. Automaton has 390 states and 505 transitions. Word has length 48 [2022-11-22 02:21:02,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:21:02,237 INFO L495 AbstractCegarLoop]: Abstraction has 390 states and 505 transitions. [2022-11-22 02:21:02,237 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.357142857142857) internal successors, (47), 14 states have internal predecessors, (47), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-22 02:21:02,237 INFO L276 IsEmpty]: Start isEmpty. Operand 390 states and 505 transitions. [2022-11-22 02:21:02,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-11-22 02:21:02,239 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:21:02,239 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:21:02,251 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-22 02:21:02,445 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-22 02:21:02,445 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:21:02,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:21:02,446 INFO L85 PathProgramCache]: Analyzing trace with hash -1953712133, now seen corresponding path program 1 times [2022-11-22 02:21:02,446 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:21:02,446 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [261792385] [2022-11-22 02:21:02,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:21:02,446 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:21:02,458 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:21:02,458 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [145935213] [2022-11-22 02:21:02,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:21:02,459 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:21:02,459 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:21:02,460 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:21:02,467 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-22 02:21:02,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:21:02,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 58 conjunts are in the unsatisfiable core [2022-11-22 02:21:02,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:21:03,289 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 10 proven. 14 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-22 02:21:03,289 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:21:04,464 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 10 proven. 13 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-22 02:21:04,465 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:21:04,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [261792385] [2022-11-22 02:21:04,465 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:21:04,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [145935213] [2022-11-22 02:21:04,465 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [145935213] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:21:04,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [324824579] [2022-11-22 02:21:04,467 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:21:04,467 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:21:04,467 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:21:04,467 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:21:04,468 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:21:09,628 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-22 02:21:12,773 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-22 02:21:12,777 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 02:21:12,800 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:21:36,068 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5255#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:21:36,069 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:21:36,069 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:21:36,069 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 25 [2022-11-22 02:21:36,069 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [772959468] [2022-11-22 02:21:36,069 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:21:36,070 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-22 02:21:36,070 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:21:36,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-22 02:21:36,071 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=2014, Unknown=0, NotChecked=0, Total=2256 [2022-11-22 02:21:36,071 INFO L87 Difference]: Start difference. First operand 390 states and 505 transitions. Second operand has 25 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 22 states have internal predecessors, (52), 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) [2022-11-22 02:21:50,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:21:50,103 INFO L93 Difference]: Finished difference Result 845 states and 1155 transitions. [2022-11-22 02:21:50,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-22 02:21:50,104 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 22 states have internal predecessors, (52), 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 49 [2022-11-22 02:21:50,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:21:50,108 INFO L225 Difference]: With dead ends: 845 [2022-11-22 02:21:50,108 INFO L226 Difference]: Without dead ends: 641 [2022-11-22 02:21:50,111 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 96 SyntacticMatches, 3 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1696 ImplicationChecksByTransitivity, 32.3s TimeCoverageRelationStatistics Valid=670, Invalid=5030, Unknown=0, NotChecked=0, Total=5700 [2022-11-22 02:21:50,112 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 301 mSDsluCounter, 422 mSDsCounter, 0 mSdLazyCounter, 1295 mSolverCounterSat, 248 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 307 SdHoareTripleChecker+Valid, 459 SdHoareTripleChecker+Invalid, 1543 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 248 IncrementalHoareTripleChecker+Valid, 1295 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.6s IncrementalHoareTripleChecker+Time [2022-11-22 02:21:50,112 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [307 Valid, 459 Invalid, 1543 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [248 Valid, 1295 Invalid, 0 Unknown, 0 Unchecked, 5.6s Time] [2022-11-22 02:21:50,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 641 states. [2022-11-22 02:21:50,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 641 to 501. [2022-11-22 02:21:50,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 501 states, 364 states have (on average 1.3104395604395604) internal successors, (477), 371 states have internal predecessors, (477), 101 states have call successors, (101), 35 states have call predecessors, (101), 35 states have return successors, (98), 94 states have call predecessors, (98), 98 states have call successors, (98) [2022-11-22 02:21:50,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 501 states to 501 states and 676 transitions. [2022-11-22 02:21:50,285 INFO L78 Accepts]: Start accepts. Automaton has 501 states and 676 transitions. Word has length 49 [2022-11-22 02:21:50,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:21:50,286 INFO L495 AbstractCegarLoop]: Abstraction has 501 states and 676 transitions. [2022-11-22 02:21:50,286 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 22 states have internal predecessors, (52), 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) [2022-11-22 02:21:50,286 INFO L276 IsEmpty]: Start isEmpty. Operand 501 states and 676 transitions. [2022-11-22 02:21:50,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-22 02:21:50,287 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:21:50,287 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:21:50,295 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-22 02:21:50,493 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:21:50,494 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:21:50,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:21:50,494 INFO L85 PathProgramCache]: Analyzing trace with hash -324758054, now seen corresponding path program 1 times [2022-11-22 02:21:50,494 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:21:50,494 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [394144282] [2022-11-22 02:21:50,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:21:50,495 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:21:50,501 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:21:50,502 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1735426574] [2022-11-22 02:21:50,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:21:50,502 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:21:50,502 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:21:50,504 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:21:50,507 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-22 02:21:50,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:21:50,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-22 02:21:50,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:21:50,615 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-22 02:21:50,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:21:50,691 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-22 02:21:50,691 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:21:50,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [394144282] [2022-11-22 02:21:50,691 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:21:50,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1735426574] [2022-11-22 02:21:50,692 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1735426574] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:21:50,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1688024362] [2022-11-22 02:21:50,693 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-22 02:21:50,694 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:21:50,694 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:21:50,694 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:21:50,695 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:21:58,675 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2022-11-22 02:21:58,738 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 02:21:58,758 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:22:03,762 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7559#(and (<= ~counter~0 51) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-22 02:22:03,762 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:22:03,762 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:22:03,763 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2022-11-22 02:22:03,763 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681131234] [2022-11-22 02:22:03,763 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:22:03,763 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-22 02:22:03,763 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:22:03,764 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-22 02:22:03,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=880, Unknown=0, NotChecked=0, Total=992 [2022-11-22 02:22:03,764 INFO L87 Difference]: Start difference. First operand 501 states and 676 transitions. Second operand has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-22 02:22:04,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:22:04,003 INFO L93 Difference]: Finished difference Result 533 states and 705 transitions. [2022-11-22 02:22:04,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-22 02:22:04,004 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 50 [2022-11-22 02:22:04,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:22:04,007 INFO L225 Difference]: With dead ends: 533 [2022-11-22 02:22:04,007 INFO L226 Difference]: Without dead ends: 531 [2022-11-22 02:22:04,008 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 302 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=128, Invalid=994, Unknown=0, NotChecked=0, Total=1122 [2022-11-22 02:22:04,008 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 26 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:22:04,009 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 131 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:22:04,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 531 states. [2022-11-22 02:22:04,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 531 to 525. [2022-11-22 02:22:04,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 525 states, 382 states have (on average 1.2958115183246073) internal successors, (495), 389 states have internal predecessors, (495), 101 states have call successors, (101), 41 states have call predecessors, (101), 41 states have return successors, (98), 94 states have call predecessors, (98), 98 states have call successors, (98) [2022-11-22 02:22:04,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 525 states to 525 states and 694 transitions. [2022-11-22 02:22:04,178 INFO L78 Accepts]: Start accepts. Automaton has 525 states and 694 transitions. Word has length 50 [2022-11-22 02:22:04,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:22:04,179 INFO L495 AbstractCegarLoop]: Abstraction has 525 states and 694 transitions. [2022-11-22 02:22:04,179 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-22 02:22:04,179 INFO L276 IsEmpty]: Start isEmpty. Operand 525 states and 694 transitions. [2022-11-22 02:22:04,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-11-22 02:22:04,181 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:22:04,181 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 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, 1, 1, 1, 1, 1] [2022-11-22 02:22:04,188 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-22 02:22:04,386 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-22 02:22:04,386 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:22:04,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:22:04,387 INFO L85 PathProgramCache]: Analyzing trace with hash -1947795252, now seen corresponding path program 1 times [2022-11-22 02:22:04,387 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:22:04,387 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [232881656] [2022-11-22 02:22:04,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:22:04,387 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:22:04,396 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:22:04,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1417403772] [2022-11-22 02:22:04,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:22:04,396 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:22:04,397 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:22:04,398 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:22:04,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-22 02:22:04,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:22:04,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-22 02:22:04,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:22:04,518 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-22 02:22:04,518 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:22:04,614 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-22 02:22:04,614 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:22:04,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [232881656] [2022-11-22 02:22:04,615 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:22:04,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1417403772] [2022-11-22 02:22:04,615 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1417403772] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:22:04,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [509083089] [2022-11-22 02:22:04,623 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-22 02:22:04,623 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:22:04,623 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:22:04,624 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:22:04,624 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:22:27,124 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-22 02:22:27,129 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 02:22:27,153 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:22:31,391 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9414#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-22 02:22:31,392 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:22:31,392 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:22:31,392 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 12 [2022-11-22 02:22:31,392 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2071947093] [2022-11-22 02:22:31,393 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:22:31,393 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-22 02:22:31,393 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:22:31,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-22 02:22:31,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=1063, Unknown=0, NotChecked=0, Total=1260 [2022-11-22 02:22:31,395 INFO L87 Difference]: Start difference. First operand 525 states and 694 transitions. Second operand has 12 states, 12 states have (on average 4.0) internal successors, (48), 12 states have internal predecessors, (48), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-22 02:22:31,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:22:31,841 INFO L93 Difference]: Finished difference Result 790 states and 1036 transitions. [2022-11-22 02:22:31,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-22 02:22:31,842 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.0) internal successors, (48), 12 states have internal predecessors, (48), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 55 [2022-11-22 02:22:31,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:22:31,845 INFO L225 Difference]: With dead ends: 790 [2022-11-22 02:22:31,845 INFO L226 Difference]: Without dead ends: 528 [2022-11-22 02:22:31,847 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 602 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=239, Invalid=1401, Unknown=0, NotChecked=0, Total=1640 [2022-11-22 02:22:31,848 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 139 mSDsluCounter, 199 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 186 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:22:31,848 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [139 Valid, 252 Invalid, 186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:22:31,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 528 states. [2022-11-22 02:22:32,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 528 to 503. [2022-11-22 02:22:32,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 503 states, 363 states have (on average 1.2506887052341598) internal successors, (454), 368 states have internal predecessors, (454), 98 states have call successors, (98), 41 states have call predecessors, (98), 41 states have return successors, (96), 93 states have call predecessors, (96), 96 states have call successors, (96) [2022-11-22 02:22:32,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 503 states to 503 states and 648 transitions. [2022-11-22 02:22:32,040 INFO L78 Accepts]: Start accepts. Automaton has 503 states and 648 transitions. Word has length 55 [2022-11-22 02:22:32,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:22:32,040 INFO L495 AbstractCegarLoop]: Abstraction has 503 states and 648 transitions. [2022-11-22 02:22:32,040 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 4.0) internal successors, (48), 12 states have internal predecessors, (48), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-22 02:22:32,041 INFO L276 IsEmpty]: Start isEmpty. Operand 503 states and 648 transitions. [2022-11-22 02:22:32,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-22 02:22:32,042 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:22:32,042 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 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, 1] [2022-11-22 02:22:32,053 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-22 02:22:32,253 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-22 02:22:32,253 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:22:32,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:22:32,254 INFO L85 PathProgramCache]: Analyzing trace with hash -897475049, now seen corresponding path program 2 times [2022-11-22 02:22:32,254 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:22:32,254 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1213979616] [2022-11-22 02:22:32,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:22:32,254 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:22:32,262 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:22:32,262 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1670954552] [2022-11-22 02:22:32,262 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:22:32,262 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:22:32,275 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:22:32,276 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:22:32,295 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-22 02:22:32,334 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-22 02:22:32,334 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:22:32,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-22 02:22:32,337 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:22:32,468 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2022-11-22 02:22:32,468 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:22:32,563 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-11-22 02:22:32,563 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:22:32,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1213979616] [2022-11-22 02:22:32,563 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:22:32,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1670954552] [2022-11-22 02:22:32,564 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1670954552] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-22 02:22:32,564 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-22 02:22:32,564 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [9] total 12 [2022-11-22 02:22:32,564 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490897134] [2022-11-22 02:22:32,564 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:22:32,565 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 02:22:32,565 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:22:32,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 02:22:32,565 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-11-22 02:22:32,565 INFO L87 Difference]: Start difference. First operand 503 states and 648 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 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) [2022-11-22 02:22:32,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:22:32,756 INFO L93 Difference]: Finished difference Result 544 states and 686 transitions. [2022-11-22 02:22:32,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 02:22:32,757 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 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 58 [2022-11-22 02:22:32,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:22:32,759 INFO L225 Difference]: With dead ends: 544 [2022-11-22 02:22:32,760 INFO L226 Difference]: Without dead ends: 542 [2022-11-22 02:22:32,760 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2022-11-22 02:22:32,761 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 11 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:22:32,761 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 111 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:22:32,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 542 states. [2022-11-22 02:22:32,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 542 to 535. [2022-11-22 02:22:32,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 535 states, 387 states have (on average 1.2299741602067182) internal successors, (476), 392 states have internal predecessors, (476), 98 states have call successors, (98), 49 states have call predecessors, (98), 49 states have return successors, (96), 93 states have call predecessors, (96), 96 states have call successors, (96) [2022-11-22 02:22:32,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 535 states to 535 states and 670 transitions. [2022-11-22 02:22:32,897 INFO L78 Accepts]: Start accepts. Automaton has 535 states and 670 transitions. Word has length 58 [2022-11-22 02:22:32,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:22:32,898 INFO L495 AbstractCegarLoop]: Abstraction has 535 states and 670 transitions. [2022-11-22 02:22:32,898 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 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) [2022-11-22 02:22:32,898 INFO L276 IsEmpty]: Start isEmpty. Operand 535 states and 670 transitions. [2022-11-22 02:22:32,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-22 02:22:32,899 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:22:32,899 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 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, 1] [2022-11-22 02:22:32,905 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-22 02:22:33,105 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:22:33,105 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:22:33,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:22:33,106 INFO L85 PathProgramCache]: Analyzing trace with hash 1281872666, now seen corresponding path program 2 times [2022-11-22 02:22:33,106 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:22:33,106 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [817935075] [2022-11-22 02:22:33,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:22:33,106 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:22:33,113 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:22:33,113 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [296215844] [2022-11-22 02:22:33,114 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:22:33,114 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:22:33,114 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:22:33,119 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:22:33,147 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-22 02:22:33,192 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-22 02:22:33,192 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:22:33,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-22 02:22:33,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:22:33,337 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-22 02:22:33,337 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:22:33,431 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-11-22 02:22:33,431 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:22:33,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [817935075] [2022-11-22 02:22:33,432 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:22:33,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [296215844] [2022-11-22 02:22:33,432 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [296215844] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-22 02:22:33,432 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-22 02:22:33,432 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 13 [2022-11-22 02:22:33,433 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1817498427] [2022-11-22 02:22:33,433 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:22:33,433 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 02:22:33,433 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:22:33,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 02:22:33,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2022-11-22 02:22:33,434 INFO L87 Difference]: Start difference. First operand 535 states and 670 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 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) [2022-11-22 02:22:33,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:22:33,722 INFO L93 Difference]: Finished difference Result 613 states and 770 transitions. [2022-11-22 02:22:33,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 02:22:33,723 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 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 60 [2022-11-22 02:22:33,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:22:33,726 INFO L225 Difference]: With dead ends: 613 [2022-11-22 02:22:33,726 INFO L226 Difference]: Without dead ends: 611 [2022-11-22 02:22:33,727 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2022-11-22 02:22:33,727 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 8 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 109 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 [2022-11-22 02:22:33,728 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 109 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:22:33,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 611 states. [2022-11-22 02:22:33,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 611 to 602. [2022-11-22 02:22:33,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 602 states, 428 states have (on average 1.2289719626168225) internal successors, (526), 434 states have internal predecessors, (526), 116 states have call successors, (116), 57 states have call predecessors, (116), 57 states have return successors, (114), 110 states have call predecessors, (114), 114 states have call successors, (114) [2022-11-22 02:22:33,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 602 states to 602 states and 756 transitions. [2022-11-22 02:22:33,962 INFO L78 Accepts]: Start accepts. Automaton has 602 states and 756 transitions. Word has length 60 [2022-11-22 02:22:33,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:22:33,963 INFO L495 AbstractCegarLoop]: Abstraction has 602 states and 756 transitions. [2022-11-22 02:22:33,963 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 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) [2022-11-22 02:22:33,963 INFO L276 IsEmpty]: Start isEmpty. Operand 602 states and 756 transitions. [2022-11-22 02:22:33,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-22 02:22:33,964 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:22:33,965 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 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, 1, 1] [2022-11-22 02:22:33,971 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-22 02:22:34,171 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-22 02:22:34,172 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:22:34,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:22:34,172 INFO L85 PathProgramCache]: Analyzing trace with hash 1844245864, now seen corresponding path program 1 times [2022-11-22 02:22:34,172 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:22:34,172 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [760359577] [2022-11-22 02:22:34,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:22:34,173 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:22:34,194 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:22:34,206 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1531659047] [2022-11-22 02:22:34,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:22:34,206 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:22:34,206 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:22:34,209 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:22:34,227 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-22 02:22:34,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:22:34,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-22 02:22:34,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:22:34,356 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-22 02:22:34,356 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:22:34,470 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-22 02:22:34,470 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:22:34,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [760359577] [2022-11-22 02:22:34,470 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:22:34,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1531659047] [2022-11-22 02:22:34,471 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1531659047] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:22:34,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1828254005] [2022-11-22 02:22:34,472 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-22 02:22:34,472 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:22:34,473 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:22:34,473 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:22:34,473 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:22:39,038 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-22 02:22:43,314 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-22 02:22:43,318 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 02:22:43,338 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:23:01,222 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15591#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-22 02:23:01,222 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:23:01,222 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:23:01,222 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 16 [2022-11-22 02:23:01,222 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256153344] [2022-11-22 02:23:01,222 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:23:01,223 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-22 02:23:01,223 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:23:01,223 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-22 02:23:01,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=1151, Unknown=0, NotChecked=0, Total=1406 [2022-11-22 02:23:01,224 INFO L87 Difference]: Start difference. First operand 602 states and 756 transitions. Second operand has 16 states, 16 states have (on average 3.875) internal successors, (62), 16 states have internal predecessors, (62), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-22 02:23:02,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:23:02,232 INFO L93 Difference]: Finished difference Result 1248 states and 1622 transitions. [2022-11-22 02:23:02,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-22 02:23:02,232 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.875) internal successors, (62), 16 states have internal predecessors, (62), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 60 [2022-11-22 02:23:02,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:23:02,237 INFO L225 Difference]: With dead ends: 1248 [2022-11-22 02:23:02,237 INFO L226 Difference]: Without dead ends: 1097 [2022-11-22 02:23:02,239 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 140 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 827 ImplicationChecksByTransitivity, 18.1s TimeCoverageRelationStatistics Valid=368, Invalid=1794, Unknown=0, NotChecked=0, Total=2162 [2022-11-22 02:23:02,240 INFO L413 NwaCegarLoop]: 74 mSDtfsCounter, 289 mSDsluCounter, 281 mSDsCounter, 0 mSdLazyCounter, 208 mSolverCounterSat, 145 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 289 SdHoareTripleChecker+Valid, 355 SdHoareTripleChecker+Invalid, 353 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 145 IncrementalHoareTripleChecker+Valid, 208 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:23:02,240 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [289 Valid, 355 Invalid, 353 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [145 Valid, 208 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:23:02,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1097 states. [2022-11-22 02:23:02,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1097 to 1030. [2022-11-22 02:23:02,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1030 states, 720 states have (on average 1.2166666666666666) internal successors, (876), 735 states have internal predecessors, (876), 219 states have call successors, (219), 90 states have call predecessors, (219), 90 states have return successors, (214), 204 states have call predecessors, (214), 214 states have call successors, (214) [2022-11-22 02:23:02,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1030 states to 1030 states and 1309 transitions. [2022-11-22 02:23:02,637 INFO L78 Accepts]: Start accepts. Automaton has 1030 states and 1309 transitions. Word has length 60 [2022-11-22 02:23:02,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:23:02,638 INFO L495 AbstractCegarLoop]: Abstraction has 1030 states and 1309 transitions. [2022-11-22 02:23:02,638 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.875) internal successors, (62), 16 states have internal predecessors, (62), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-22 02:23:02,638 INFO L276 IsEmpty]: Start isEmpty. Operand 1030 states and 1309 transitions. [2022-11-22 02:23:02,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-22 02:23:02,640 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:23:02,640 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:23:02,651 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-22 02:23:02,851 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-22 02:23:02,851 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:23:02,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:23:02,852 INFO L85 PathProgramCache]: Analyzing trace with hash 186118403, now seen corresponding path program 1 times [2022-11-22 02:23:02,852 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:23:02,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1720357416] [2022-11-22 02:23:02,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:23:02,852 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:23:02,862 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:23:02,862 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1768134773] [2022-11-22 02:23:02,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:23:02,863 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:23:02,863 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:23:02,864 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:23:02,885 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-22 02:23:02,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:23:02,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-22 02:23:02,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:23:03,803 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 10 proven. 39 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-22 02:23:03,803 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:23:04,421 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 32 proven. 10 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-22 02:23:04,421 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:23:04,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1720357416] [2022-11-22 02:23:04,422 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:23:04,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1768134773] [2022-11-22 02:23:04,422 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1768134773] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:23:04,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [753636477] [2022-11-22 02:23:04,424 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-22 02:23:04,424 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:23:04,424 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:23:04,425 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:23:04,425 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:23:08,946 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-22 02:23:12,878 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-22 02:23:12,882 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 02:23:12,902 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:23:34,480 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19262#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-22 02:23:34,480 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:23:34,480 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:23:34,480 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 8] total 22 [2022-11-22 02:23:34,480 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1230400692] [2022-11-22 02:23:34,480 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:23:34,481 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-22 02:23:34,481 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:23:34,481 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-22 02:23:34,482 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1708, Unknown=0, NotChecked=0, Total=1892 [2022-11-22 02:23:34,483 INFO L87 Difference]: Start difference. First operand 1030 states and 1309 transitions. Second operand has 22 states, 21 states have (on average 3.380952380952381) internal successors, (71), 18 states have internal predecessors, (71), 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) [2022-11-22 02:24:48,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:24:48,458 INFO L93 Difference]: Finished difference Result 1748 states and 2329 transitions. [2022-11-22 02:24:48,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-11-22 02:24:48,459 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 3.380952380952381) internal successors, (71), 18 states have internal predecessors, (71), 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 61 [2022-11-22 02:24:48,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:24:48,465 INFO L225 Difference]: With dead ends: 1748 [2022-11-22 02:24:48,465 INFO L226 Difference]: Without dead ends: 1420 [2022-11-22 02:24:48,468 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 159 SyntacticMatches, 2 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1872 ImplicationChecksByTransitivity, 73.4s TimeCoverageRelationStatistics Valid=687, Invalid=5633, Unknown=0, NotChecked=0, Total=6320 [2022-11-22 02:24:48,469 INFO L413 NwaCegarLoop]: 82 mSDtfsCounter, 344 mSDsluCounter, 614 mSDsCounter, 0 mSdLazyCounter, 1447 mSolverCounterSat, 306 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 22.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 348 SdHoareTripleChecker+Valid, 696 SdHoareTripleChecker+Invalid, 1753 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 306 IncrementalHoareTripleChecker+Valid, 1447 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 22.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:24:48,470 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [348 Valid, 696 Invalid, 1753 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [306 Valid, 1447 Invalid, 0 Unknown, 0 Unchecked, 22.3s Time] [2022-11-22 02:24:48,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1420 states. [2022-11-22 02:24:48,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1420 to 1146. [2022-11-22 02:24:48,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1146 states, 813 states have (on average 1.2533825338253382) internal successors, (1019), 835 states have internal predecessors, (1019), 247 states have call successors, (247), 85 states have call predecessors, (247), 85 states have return successors, (242), 225 states have call predecessors, (242), 242 states have call successors, (242) [2022-11-22 02:24:48,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1146 states to 1146 states and 1508 transitions. [2022-11-22 02:24:48,985 INFO L78 Accepts]: Start accepts. Automaton has 1146 states and 1508 transitions. Word has length 61 [2022-11-22 02:24:48,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:24:48,985 INFO L495 AbstractCegarLoop]: Abstraction has 1146 states and 1508 transitions. [2022-11-22 02:24:48,985 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 3.380952380952381) internal successors, (71), 18 states have internal predecessors, (71), 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) [2022-11-22 02:24:48,986 INFO L276 IsEmpty]: Start isEmpty. Operand 1146 states and 1508 transitions. [2022-11-22 02:24:48,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-22 02:24:48,987 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:24:48,987 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:24:48,999 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-22 02:24:49,193 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-22 02:24:49,194 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:24:49,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:24:49,194 INFO L85 PathProgramCache]: Analyzing trace with hash 1039137595, now seen corresponding path program 2 times [2022-11-22 02:24:49,194 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:24:49,195 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1386822698] [2022-11-22 02:24:49,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:24:49,195 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:24:49,212 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:24:49,212 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [56048072] [2022-11-22 02:24:49,212 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:24:49,212 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:24:49,213 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:24:49,214 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:24:49,250 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-22 02:24:49,290 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-22 02:24:49,290 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:24:49,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-22 02:24:49,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:24:49,318 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 36 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-11-22 02:24:49,319 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 02:24:49,319 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:24:49,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1386822698] [2022-11-22 02:24:49,319 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:24:49,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [56048072] [2022-11-22 02:24:49,319 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [56048072] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:24:49,319 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:24:49,320 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-22 02:24:49,320 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158499985] [2022-11-22 02:24:49,320 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:24:49,320 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 02:24:49,320 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:24:49,321 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 02:24:49,321 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-22 02:24:49,321 INFO L87 Difference]: Start difference. First operand 1146 states and 1508 transitions. Second operand has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 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) [2022-11-22 02:24:49,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:24:49,814 INFO L93 Difference]: Finished difference Result 1441 states and 1900 transitions. [2022-11-22 02:24:49,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 02:24:49,814 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 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 61 [2022-11-22 02:24:49,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:24:49,820 INFO L225 Difference]: With dead ends: 1441 [2022-11-22 02:24:49,820 INFO L226 Difference]: Without dead ends: 1209 [2022-11-22 02:24:49,822 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-11-22 02:24:49,823 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 30 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:24:49,823 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 137 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:24:49,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1209 states. [2022-11-22 02:24:50,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1209 to 1010. [2022-11-22 02:24:50,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1010 states, 719 states have (on average 1.228094575799722) internal successors, (883), 732 states have internal predecessors, (883), 205 states have call successors, (205), 85 states have call predecessors, (205), 85 states have return successors, (200), 192 states have call predecessors, (200), 200 states have call successors, (200) [2022-11-22 02:24:50,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1010 states to 1010 states and 1288 transitions. [2022-11-22 02:24:50,293 INFO L78 Accepts]: Start accepts. Automaton has 1010 states and 1288 transitions. Word has length 61 [2022-11-22 02:24:50,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:24:50,294 INFO L495 AbstractCegarLoop]: Abstraction has 1010 states and 1288 transitions. [2022-11-22 02:24:50,294 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 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) [2022-11-22 02:24:50,294 INFO L276 IsEmpty]: Start isEmpty. Operand 1010 states and 1288 transitions. [2022-11-22 02:24:50,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-22 02:24:50,295 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:24:50,295 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 3, 3, 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, 1] [2022-11-22 02:24:50,306 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-22 02:24:50,501 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:24:50,501 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:24:50,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:24:50,501 INFO L85 PathProgramCache]: Analyzing trace with hash 1945599548, now seen corresponding path program 3 times [2022-11-22 02:24:50,501 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:24:50,502 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1445005650] [2022-11-22 02:24:50,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:24:50,502 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:24:50,510 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:24:50,510 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1825213435] [2022-11-22 02:24:50,510 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:24:50,511 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:24:50,511 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:24:50,512 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:24:50,527 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-22 02:24:50,578 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:24:50,579 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:24:50,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-22 02:24:50,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:24:50,613 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-11-22 02:24:50,613 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 02:24:50,613 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:24:50,613 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1445005650] [2022-11-22 02:24:50,614 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:24:50,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1825213435] [2022-11-22 02:24:50,614 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1825213435] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:24:50,614 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:24:50,614 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-22 02:24:50,614 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1122316617] [2022-11-22 02:24:50,614 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:24:50,615 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 02:24:50,615 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:24:50,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 02:24:50,615 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-22 02:24:50,615 INFO L87 Difference]: Start difference. First operand 1010 states and 1288 transitions. Second operand has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2022-11-22 02:24:51,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:24:51,034 INFO L93 Difference]: Finished difference Result 1627 states and 2121 transitions. [2022-11-22 02:24:51,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 02:24:51,034 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), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 64 [2022-11-22 02:24:51,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:24:51,039 INFO L225 Difference]: With dead ends: 1627 [2022-11-22 02:24:51,039 INFO L226 Difference]: Without dead ends: 1176 [2022-11-22 02:24:51,041 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-11-22 02:24:51,042 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 12 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:24:51,042 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 116 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:24:51,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1176 states. [2022-11-22 02:24:51,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1176 to 1126. [2022-11-22 02:24:51,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1126 states, 787 states have (on average 1.2325285895806861) internal successors, (970), 796 states have internal predecessors, (970), 253 states have call successors, (253), 85 states have call predecessors, (253), 85 states have return successors, (248), 244 states have call predecessors, (248), 248 states have call successors, (248) [2022-11-22 02:24:51,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1126 states to 1126 states and 1471 transitions. [2022-11-22 02:24:51,594 INFO L78 Accepts]: Start accepts. Automaton has 1126 states and 1471 transitions. Word has length 64 [2022-11-22 02:24:51,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:24:51,594 INFO L495 AbstractCegarLoop]: Abstraction has 1126 states and 1471 transitions. [2022-11-22 02:24:51,595 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), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2022-11-22 02:24:51,595 INFO L276 IsEmpty]: Start isEmpty. Operand 1126 states and 1471 transitions. [2022-11-22 02:24:51,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-11-22 02:24:51,596 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:24:51,596 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:24:51,607 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-22 02:24:51,801 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:24:51,801 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:24:51,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:24:51,802 INFO L85 PathProgramCache]: Analyzing trace with hash -1497093235, now seen corresponding path program 4 times [2022-11-22 02:24:51,802 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:24:51,802 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [433117636] [2022-11-22 02:24:51,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:24:51,802 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:24:51,808 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:24:51,809 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [95744938] [2022-11-22 02:24:51,809 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:24:51,809 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:24:51,809 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:24:51,810 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:24:51,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-22 02:24:51,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:24:51,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 68 conjunts are in the unsatisfiable core [2022-11-22 02:24:51,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:24:52,986 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 10 proven. 33 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2022-11-22 02:24:52,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:24:54,935 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 16 proven. 26 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-22 02:24:54,935 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:24:54,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [433117636] [2022-11-22 02:24:54,936 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:24:54,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [95744938] [2022-11-22 02:24:54,936 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [95744938] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:24:54,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1023063836] [2022-11-22 02:24:54,937 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-22 02:24:54,937 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:24:54,938 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:24:54,938 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:24:54,938 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:24:59,518 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-22 02:25:02,828 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-22 02:25:02,833 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 02:25:02,854 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:25:26,089 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31791#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-22 02:25:26,089 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:25:26,089 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:25:26,089 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 13] total 28 [2022-11-22 02:25:26,089 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482448149] [2022-11-22 02:25:26,089 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:25:26,090 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-22 02:25:26,090 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:25:26,090 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-22 02:25:26,091 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=277, Invalid=2173, Unknown=0, NotChecked=0, Total=2450 [2022-11-22 02:25:26,091 INFO L87 Difference]: Start difference. First operand 1126 states and 1471 transitions. Second operand has 28 states, 26 states have (on average 2.769230769230769) internal successors, (72), 25 states have internal predecessors, (72), 7 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 7 states have call successors, (14) [2022-11-22 02:25:59,065 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:26:01,913 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.47s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:26:35,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:26:35,908 INFO L93 Difference]: Finished difference Result 1694 states and 2285 transitions. [2022-11-22 02:26:35,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-11-22 02:26:35,909 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 26 states have (on average 2.769230769230769) internal successors, (72), 25 states have internal predecessors, (72), 7 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 7 states have call successors, (14) Word has length 66 [2022-11-22 02:26:35,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:26:35,916 INFO L225 Difference]: With dead ends: 1694 [2022-11-22 02:26:35,916 INFO L226 Difference]: Without dead ends: 1688 [2022-11-22 02:26:35,919 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 146 SyntacticMatches, 2 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2449 ImplicationChecksByTransitivity, 63.8s TimeCoverageRelationStatistics Valid=1107, Invalid=6548, Unknown=1, NotChecked=0, Total=7656 [2022-11-22 02:26:35,920 INFO L413 NwaCegarLoop]: 96 mSDtfsCounter, 537 mSDsluCounter, 800 mSDsCounter, 0 mSdLazyCounter, 1455 mSolverCounterSat, 448 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 30.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 538 SdHoareTripleChecker+Valid, 896 SdHoareTripleChecker+Invalid, 1904 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 448 IncrementalHoareTripleChecker+Valid, 1455 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 30.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:26:35,920 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [538 Valid, 896 Invalid, 1904 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [448 Valid, 1455 Invalid, 1 Unknown, 0 Unchecked, 30.3s Time] [2022-11-22 02:26:35,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1688 states. [2022-11-22 02:26:36,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1688 to 1430. [2022-11-22 02:26:36,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1430 states, 1014 states have (on average 1.2504930966469427) internal successors, (1268), 1022 states have internal predecessors, (1268), 310 states have call successors, (310), 106 states have call predecessors, (310), 105 states have return successors, (306), 301 states have call predecessors, (306), 306 states have call successors, (306) [2022-11-22 02:26:36,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1430 states to 1430 states and 1884 transitions. [2022-11-22 02:26:36,768 INFO L78 Accepts]: Start accepts. Automaton has 1430 states and 1884 transitions. Word has length 66 [2022-11-22 02:26:36,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:26:36,768 INFO L495 AbstractCegarLoop]: Abstraction has 1430 states and 1884 transitions. [2022-11-22 02:26:36,768 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 26 states have (on average 2.769230769230769) internal successors, (72), 25 states have internal predecessors, (72), 7 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 7 states have call successors, (14) [2022-11-22 02:26:36,768 INFO L276 IsEmpty]: Start isEmpty. Operand 1430 states and 1884 transitions. [2022-11-22 02:26:36,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-22 02:26:36,770 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:26:36,770 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:26:36,776 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-22 02:26:36,976 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-11-22 02:26:36,976 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:26:36,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:26:36,977 INFO L85 PathProgramCache]: Analyzing trace with hash 1524056252, now seen corresponding path program 1 times [2022-11-22 02:26:36,977 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:26:36,979 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [788344162] [2022-11-22 02:26:36,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:26:36,979 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:26:36,998 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:26:36,998 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1823395997] [2022-11-22 02:26:36,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:26:36,999 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:26:36,999 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:26:37,000 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:26:37,019 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-22 02:26:37,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:26:37,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-22 02:26:37,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:26:37,248 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 29 proven. 30 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-22 02:26:37,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:26:37,469 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 29 proven. 30 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-22 02:26:37,469 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:26:37,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [788344162] [2022-11-22 02:26:37,469 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:26:37,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1823395997] [2022-11-22 02:26:37,470 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1823395997] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:26:37,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [828430118] [2022-11-22 02:26:37,471 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:26:37,471 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:26:37,472 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:26:37,472 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:26:37,472 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:26:42,266 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-22 02:26:42,266 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 17 iterations. Over-approximation may be very coarse. [2022-11-22 02:26:43,745 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-22 02:26:43,749 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 02:26:43,770 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:26:52,600 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36805#(and (<= ~counter~0 52) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-22 02:26:52,600 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:26:52,600 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:26:52,600 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12] total 22 [2022-11-22 02:26:52,601 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710001846] [2022-11-22 02:26:52,601 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:26:52,601 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-22 02:26:52,601 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:26:52,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-22 02:26:52,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1673, Unknown=0, NotChecked=0, Total=2070 [2022-11-22 02:26:52,603 INFO L87 Difference]: Start difference. First operand 1430 states and 1884 transitions. Second operand has 22 states, 22 states have (on average 3.6363636363636362) internal successors, (80), 22 states have internal predecessors, (80), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-22 02:26:55,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:26:55,315 INFO L93 Difference]: Finished difference Result 3913 states and 5424 transitions. [2022-11-22 02:26:55,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-22 02:26:55,316 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.6363636363636362) internal successors, (80), 22 states have internal predecessors, (80), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 68 [2022-11-22 02:26:55,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:26:55,329 INFO L225 Difference]: With dead ends: 3913 [2022-11-22 02:26:55,330 INFO L226 Difference]: Without dead ends: 3390 [2022-11-22 02:26:55,333 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 157 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1336 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=674, Invalid=2986, Unknown=0, NotChecked=0, Total=3660 [2022-11-22 02:26:55,334 INFO L413 NwaCegarLoop]: 92 mSDtfsCounter, 723 mSDsluCounter, 479 mSDsCounter, 0 mSdLazyCounter, 369 mSolverCounterSat, 358 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 723 SdHoareTripleChecker+Valid, 571 SdHoareTripleChecker+Invalid, 727 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 358 IncrementalHoareTripleChecker+Valid, 369 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 02:26:55,335 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [723 Valid, 571 Invalid, 727 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [358 Valid, 369 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 02:26:55,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3390 states. [2022-11-22 02:26:56,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3390 to 3265. [2022-11-22 02:26:56,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3265 states, 2334 states have (on average 1.2609254498714653) internal successors, (2943), 2349 states have internal predecessors, (2943), 736 states have call successors, (736), 195 states have call predecessors, (736), 194 states have return successors, (726), 720 states have call predecessors, (726), 726 states have call successors, (726) [2022-11-22 02:26:56,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3265 states to 3265 states and 4405 transitions. [2022-11-22 02:26:56,833 INFO L78 Accepts]: Start accepts. Automaton has 3265 states and 4405 transitions. Word has length 68 [2022-11-22 02:26:56,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:26:56,833 INFO L495 AbstractCegarLoop]: Abstraction has 3265 states and 4405 transitions. [2022-11-22 02:26:56,834 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 3.6363636363636362) internal successors, (80), 22 states have internal predecessors, (80), 5 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-22 02:26:56,834 INFO L276 IsEmpty]: Start isEmpty. Operand 3265 states and 4405 transitions. [2022-11-22 02:26:56,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-11-22 02:26:56,835 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:26:56,835 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 3, 2, 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] [2022-11-22 02:26:56,841 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-22 02:26:57,041 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-22 02:26:57,041 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:26:57,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:26:57,042 INFO L85 PathProgramCache]: Analyzing trace with hash 689077281, now seen corresponding path program 1 times [2022-11-22 02:26:57,042 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:26:57,042 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1290074441] [2022-11-22 02:26:57,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:26:57,042 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:26:57,059 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:26:57,060 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1313926398] [2022-11-22 02:26:57,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:26:57,060 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:26:57,060 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:26:57,061 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:26:57,064 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-22 02:26:57,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:26:57,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 77 conjunts are in the unsatisfiable core [2022-11-22 02:26:57,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:26:58,453 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 30 proven. 34 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-11-22 02:26:58,453 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:27:02,214 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 30 proven. 33 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2022-11-22 02:27:02,215 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:27:02,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1290074441] [2022-11-22 02:27:02,215 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:27:02,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1313926398] [2022-11-22 02:27:02,215 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1313926398] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:27:02,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1420000683] [2022-11-22 02:27:02,217 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:27:02,217 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:27:02,217 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:27:02,217 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:27:02,218 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:27:28,816 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2022-11-22 02:27:28,820 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 02:27:28,841 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:27:33,690 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '47699#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2022-11-22 02:27:33,690 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:27:33,690 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:27:33,690 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 16] total 32 [2022-11-22 02:27:33,691 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443265326] [2022-11-22 02:27:33,691 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:27:33,691 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-22 02:27:33,691 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:27:33,691 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-22 02:27:33,692 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=2398, Unknown=0, NotChecked=0, Total=2652 [2022-11-22 02:27:33,692 INFO L87 Difference]: Start difference. First operand 3265 states and 4405 transitions. Second operand has 32 states, 29 states have (on average 2.4827586206896552) internal successors, (72), 30 states have internal predecessors, (72), 9 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) [2022-11-22 02:28:13,331 WARN L233 SmtUtils]: Spent 5.41s on a formula simplification that was a NOOP. DAG size: 109 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 02:28:29,713 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:28:59,311 WARN L233 SmtUtils]: Spent 5.07s on a formula simplification. DAG size of input: 108 DAG size of output: 94 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 02:29:13,454 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 [] [2022-11-22 02:29:23,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:29:23,989 INFO L93 Difference]: Finished difference Result 5368 states and 7465 transitions. [2022-11-22 02:29:23,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2022-11-22 02:29:23,990 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 29 states have (on average 2.4827586206896552) internal successors, (72), 30 states have internal predecessors, (72), 9 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) Word has length 79 [2022-11-22 02:29:23,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:29:24,009 INFO L225 Difference]: With dead ends: 5368 [2022-11-22 02:29:24,009 INFO L226 Difference]: Without dead ends: 5317 [2022-11-22 02:29:24,015 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 174 SyntacticMatches, 11 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7324 ImplicationChecksByTransitivity, 78.5s TimeCoverageRelationStatistics Valid=2799, Invalid=15833, Unknown=0, NotChecked=0, Total=18632 [2022-11-22 02:29:24,016 INFO L413 NwaCegarLoop]: 96 mSDtfsCounter, 722 mSDsluCounter, 984 mSDsCounter, 0 mSdLazyCounter, 2578 mSolverCounterSat, 762 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 34.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 722 SdHoareTripleChecker+Valid, 1080 SdHoareTripleChecker+Invalid, 3341 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 762 IncrementalHoareTripleChecker+Valid, 2578 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 34.8s IncrementalHoareTripleChecker+Time [2022-11-22 02:29:24,016 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [722 Valid, 1080 Invalid, 3341 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [762 Valid, 2578 Invalid, 1 Unknown, 0 Unchecked, 34.8s Time] [2022-11-22 02:29:24,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5317 states. [2022-11-22 02:29:27,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5317 to 4128. [2022-11-22 02:29:27,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4128 states, 3001 states have (on average 1.279573475508164) internal successors, (3840), 3014 states have internal predecessors, (3840), 902 states have call successors, (902), 225 states have call predecessors, (902), 224 states have return successors, (892), 888 states have call predecessors, (892), 892 states have call successors, (892) [2022-11-22 02:29:27,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4128 states to 4128 states and 5634 transitions. [2022-11-22 02:29:27,086 INFO L78 Accepts]: Start accepts. Automaton has 4128 states and 5634 transitions. Word has length 79 [2022-11-22 02:29:27,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:29:27,087 INFO L495 AbstractCegarLoop]: Abstraction has 4128 states and 5634 transitions. [2022-11-22 02:29:27,087 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 29 states have (on average 2.4827586206896552) internal successors, (72), 30 states have internal predecessors, (72), 9 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) [2022-11-22 02:29:27,087 INFO L276 IsEmpty]: Start isEmpty. Operand 4128 states and 5634 transitions. [2022-11-22 02:29:27,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-11-22 02:29:27,090 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:29:27,090 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:29:27,099 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-22 02:29:27,299 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:29:27,299 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:29:27,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:29:27,299 INFO L85 PathProgramCache]: Analyzing trace with hash 1576694894, now seen corresponding path program 2 times [2022-11-22 02:29:27,300 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:29:27,300 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2005943550] [2022-11-22 02:29:27,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:29:27,300 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:29:27,308 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:29:27,308 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1822132386] [2022-11-22 02:29:27,309 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:29:27,309 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:29:27,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:29:27,310 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:29:27,319 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-22 02:29:27,385 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-22 02:29:27,385 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:29:27,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-22 02:29:27,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:29:27,591 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 16 proven. 120 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2022-11-22 02:29:27,591 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:29:27,870 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 16 proven. 56 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2022-11-22 02:29:27,871 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:29:27,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2005943550] [2022-11-22 02:29:27,871 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:29:27,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1822132386] [2022-11-22 02:29:27,871 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1822132386] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:29:27,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [671184724] [2022-11-22 02:29:27,873 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:29:27,873 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:29:27,873 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:29:27,874 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:29:27,874 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:29:32,559 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-22 02:29:36,236 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-22 02:29:36,240 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 02:29:36,262 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:29:57,550 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '62188#(and (<= ~counter~0 52) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-22 02:29:57,551 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:29:57,551 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:29:57,551 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 26 [2022-11-22 02:29:57,551 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1430624143] [2022-11-22 02:29:57,551 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:29:57,552 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-22 02:29:57,552 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:29:57,552 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-22 02:29:57,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=496, Invalid=1856, Unknown=0, NotChecked=0, Total=2352 [2022-11-22 02:29:57,553 INFO L87 Difference]: Start difference. First operand 4128 states and 5634 transitions. Second operand has 26 states, 26 states have (on average 3.5384615384615383) internal successors, (92), 26 states have internal predecessors, (92), 7 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (20), 6 states have call predecessors, (20), 6 states have call successors, (20) [2022-11-22 02:30:04,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:30:04,418 INFO L93 Difference]: Finished difference Result 6552 states and 9156 transitions. [2022-11-22 02:30:04,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-11-22 02:30:04,419 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.5384615384615383) internal successors, (92), 26 states have internal predecessors, (92), 7 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (20), 6 states have call predecessors, (20), 6 states have call successors, (20) Word has length 89 [2022-11-22 02:30:04,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:30:04,447 INFO L225 Difference]: With dead ends: 6552 [2022-11-22 02:30:04,447 INFO L226 Difference]: Without dead ends: 6510 [2022-11-22 02:30:04,450 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 214 SyntacticMatches, 4 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1722 ImplicationChecksByTransitivity, 21.8s TimeCoverageRelationStatistics Valid=926, Invalid=3630, Unknown=0, NotChecked=0, Total=4556 [2022-11-22 02:30:04,451 INFO L413 NwaCegarLoop]: 114 mSDtfsCounter, 730 mSDsluCounter, 488 mSDsCounter, 0 mSdLazyCounter, 468 mSolverCounterSat, 333 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 730 SdHoareTripleChecker+Valid, 602 SdHoareTripleChecker+Invalid, 801 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 333 IncrementalHoareTripleChecker+Valid, 468 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-22 02:30:04,451 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [730 Valid, 602 Invalid, 801 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [333 Valid, 468 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-22 02:30:04,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6510 states. [2022-11-22 02:30:09,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6510 to 6280. [2022-11-22 02:30:09,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6280 states, 4631 states have (on average 1.2709997840639171) internal successors, (5886), 4683 states have internal predecessors, (5886), 1355 states have call successors, (1355), 294 states have call predecessors, (1355), 293 states have return successors, (1341), 1302 states have call predecessors, (1341), 1341 states have call successors, (1341) [2022-11-22 02:30:09,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6280 states to 6280 states and 8582 transitions. [2022-11-22 02:30:09,415 INFO L78 Accepts]: Start accepts. Automaton has 6280 states and 8582 transitions. Word has length 89 [2022-11-22 02:30:09,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:30:09,415 INFO L495 AbstractCegarLoop]: Abstraction has 6280 states and 8582 transitions. [2022-11-22 02:30:09,415 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 3.5384615384615383) internal successors, (92), 26 states have internal predecessors, (92), 7 states have call successors, (21), 5 states have call predecessors, (21), 4 states have return successors, (20), 6 states have call predecessors, (20), 6 states have call successors, (20) [2022-11-22 02:30:09,416 INFO L276 IsEmpty]: Start isEmpty. Operand 6280 states and 8582 transitions. [2022-11-22 02:30:09,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2022-11-22 02:30:09,418 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:30:09,418 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:30:09,428 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-22 02:30:09,626 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-22 02:30:09,627 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:30:09,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:30:09,627 INFO L85 PathProgramCache]: Analyzing trace with hash 1613266328, now seen corresponding path program 2 times [2022-11-22 02:30:09,627 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:30:09,627 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [703738523] [2022-11-22 02:30:09,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:30:09,627 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:30:09,634 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:30:09,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1280344854] [2022-11-22 02:30:09,634 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:30:09,634 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:30:09,634 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:30:09,635 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:30:09,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-22 02:30:09,698 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-22 02:30:09,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:30:09,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-22 02:30:09,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:30:09,768 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 56 proven. 7 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2022-11-22 02:30:09,769 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:30:09,854 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 56 proven. 7 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2022-11-22 02:30:09,854 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:30:09,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [703738523] [2022-11-22 02:30:09,855 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:30:09,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1280344854] [2022-11-22 02:30:09,855 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1280344854] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:30:09,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1242035416] [2022-11-22 02:30:09,856 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:30:09,856 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:30:09,857 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:30:09,857 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:30:09,857 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:30:14,527 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 16 iterations. Over-approximation may be very coarse. [2022-11-22 02:30:18,309 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-22 02:30:18,313 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 02:30:18,336 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:30:37,395 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '81223#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:30:37,395 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:30:37,395 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:30:37,395 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2022-11-22 02:30:37,395 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067525597] [2022-11-22 02:30:37,396 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:30:37,396 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-22 02:30:37,396 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:30:37,396 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-22 02:30:37,396 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=802, Unknown=0, NotChecked=0, Total=930 [2022-11-22 02:30:37,396 INFO L87 Difference]: Start difference. First operand 6280 states and 8582 transitions. Second operand has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 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) [2022-11-22 02:30:45,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:30:45,307 INFO L93 Difference]: Finished difference Result 8879 states and 12598 transitions. [2022-11-22 02:30:45,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-22 02:30:45,308 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 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 90 [2022-11-22 02:30:45,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:30:45,346 INFO L225 Difference]: With dead ends: 8879 [2022-11-22 02:30:45,346 INFO L226 Difference]: Without dead ends: 8817 [2022-11-22 02:30:45,350 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 237 SyntacticMatches, 10 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 19.3s TimeCoverageRelationStatistics Valid=223, Invalid=1669, Unknown=0, NotChecked=0, Total=1892 [2022-11-22 02:30:45,350 INFO L413 NwaCegarLoop]: 100 mSDtfsCounter, 120 mSDsluCounter, 266 mSDsCounter, 0 mSdLazyCounter, 332 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 366 SdHoareTripleChecker+Invalid, 413 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 332 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-22 02:30:45,351 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [124 Valid, 366 Invalid, 413 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 332 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-22 02:30:45,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8817 states. [2022-11-22 02:30:50,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8817 to 6261. [2022-11-22 02:30:50,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6261 states, 4543 states have (on average 1.2775698877393793) internal successors, (5804), 4604 states have internal predecessors, (5804), 1424 states have call successors, (1424), 294 states have call predecessors, (1424), 293 states have return successors, (1410), 1362 states have call predecessors, (1410), 1410 states have call successors, (1410) [2022-11-22 02:30:50,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6261 states to 6261 states and 8638 transitions. [2022-11-22 02:30:50,558 INFO L78 Accepts]: Start accepts. Automaton has 6261 states and 8638 transitions. Word has length 90 [2022-11-22 02:30:50,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:30:50,559 INFO L495 AbstractCegarLoop]: Abstraction has 6261 states and 8638 transitions. [2022-11-22 02:30:50,560 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 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) [2022-11-22 02:30:50,560 INFO L276 IsEmpty]: Start isEmpty. Operand 6261 states and 8638 transitions. [2022-11-22 02:30:50,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2022-11-22 02:30:50,562 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:30:50,562 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 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, 1] [2022-11-22 02:30:50,576 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-22 02:30:50,768 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-11-22 02:30:50,768 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:30:50,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:30:50,769 INFO L85 PathProgramCache]: Analyzing trace with hash -307282759, now seen corresponding path program 2 times [2022-11-22 02:30:50,769 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:30:50,769 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2121171452] [2022-11-22 02:30:50,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:30:50,769 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:30:50,776 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:30:50,777 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1933589791] [2022-11-22 02:30:50,777 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:30:50,777 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:30:50,777 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:30:50,781 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:30:50,782 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-22 02:30:50,869 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-22 02:30:50,869 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:30:50,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 66 conjunts are in the unsatisfiable core [2022-11-22 02:30:50,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:30:52,339 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 24 proven. 35 refuted. 0 times theorem prover too weak. 265 trivial. 0 not checked. [2022-11-22 02:30:52,339 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:30:54,304 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 24 proven. 34 refuted. 0 times theorem prover too weak. 266 trivial. 0 not checked. [2022-11-22 02:30:54,304 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:30:54,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2121171452] [2022-11-22 02:30:54,305 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:30:54,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1933589791] [2022-11-22 02:30:54,305 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1933589791] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:30:54,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1765936131] [2022-11-22 02:30:54,306 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-22 02:30:54,306 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:30:54,307 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:30:54,307 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:30:54,307 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:31:26,203 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2022-11-22 02:31:26,259 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 69 for LOIs [2022-11-22 02:31:26,297 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:31:34,654 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '103861#(and (<= ~counter~0 51) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= 3 ~counter~0) (= |#NULL.base| 0))' at error location [2022-11-22 02:31:34,654 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:31:34,654 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:31:34,654 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 30 [2022-11-22 02:31:34,654 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1005511054] [2022-11-22 02:31:34,655 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:31:34,655 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-22 02:31:34,655 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:31:34,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-22 02:31:34,656 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=2598, Unknown=0, NotChecked=0, Total=2862 [2022-11-22 02:31:34,657 INFO L87 Difference]: Start difference. First operand 6261 states and 8638 transitions. Second operand has 30 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 27 states have internal predecessors, (67), 10 states have call successors, (29), 3 states have call predecessors, (29), 2 states have return successors, (28), 8 states have call predecessors, (28), 8 states have call successors, (28) [2022-11-22 02:31:47,967 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.25s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:32:19,318 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:32:42,335 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.72s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:33:15,406 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:33:38,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:33:38,864 INFO L93 Difference]: Finished difference Result 11043 states and 15344 transitions. [2022-11-22 02:33:38,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2022-11-22 02:33:38,864 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 27 states have internal predecessors, (67), 10 states have call successors, (29), 3 states have call predecessors, (29), 2 states have return successors, (28), 8 states have call predecessors, (28), 8 states have call successors, (28) Word has length 99 [2022-11-22 02:33:38,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:33:38,890 INFO L225 Difference]: With dead ends: 11043 [2022-11-22 02:33:38,890 INFO L226 Difference]: Without dead ends: 7647 [2022-11-22 02:33:38,900 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 243 SyntacticMatches, 0 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5983 ImplicationChecksByTransitivity, 91.0s TimeCoverageRelationStatistics Valid=2451, Invalid=15639, Unknown=0, NotChecked=0, Total=18090 [2022-11-22 02:33:38,901 INFO L413 NwaCegarLoop]: 128 mSDtfsCounter, 539 mSDsluCounter, 1014 mSDsCounter, 0 mSdLazyCounter, 2150 mSolverCounterSat, 722 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 34.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 539 SdHoareTripleChecker+Valid, 1142 SdHoareTripleChecker+Invalid, 2874 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 722 IncrementalHoareTripleChecker+Valid, 2150 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 35.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:33:38,902 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [539 Valid, 1142 Invalid, 2874 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [722 Valid, 2150 Invalid, 2 Unknown, 0 Unchecked, 35.0s Time] [2022-11-22 02:33:38,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7647 states. [2022-11-22 02:33:45,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7647 to 6627. [2022-11-22 02:33:45,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6627 states, 4759 states have (on average 1.2771590670308888) internal successors, (6078), 4823 states have internal predecessors, (6078), 1547 states have call successors, (1547), 320 states have call predecessors, (1547), 320 states have return successors, (1534), 1483 states have call predecessors, (1534), 1534 states have call successors, (1534) [2022-11-22 02:33:45,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6627 states to 6627 states and 9159 transitions. [2022-11-22 02:33:45,523 INFO L78 Accepts]: Start accepts. Automaton has 6627 states and 9159 transitions. Word has length 99 [2022-11-22 02:33:45,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:33:45,523 INFO L495 AbstractCegarLoop]: Abstraction has 6627 states and 9159 transitions. [2022-11-22 02:33:45,524 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 27 states have internal predecessors, (67), 10 states have call successors, (29), 3 states have call predecessors, (29), 2 states have return successors, (28), 8 states have call predecessors, (28), 8 states have call successors, (28) [2022-11-22 02:33:45,524 INFO L276 IsEmpty]: Start isEmpty. Operand 6627 states and 9159 transitions. [2022-11-22 02:33:45,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2022-11-22 02:33:45,527 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:33:45,527 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:33:45,541 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-22 02:33:45,733 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:33:45,734 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:33:45,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:33:45,734 INFO L85 PathProgramCache]: Analyzing trace with hash -90675194, now seen corresponding path program 1 times [2022-11-22 02:33:45,734 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:33:45,735 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1461319592] [2022-11-22 02:33:45,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:33:45,735 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:33:45,746 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:33:45,747 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1092298534] [2022-11-22 02:33:45,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:33:45,747 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:33:45,747 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:33:45,748 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:33:45,775 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_801002bd-8be0-44b4-9bc6-485efa8eac10/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-22 02:33:45,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:33:45,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-22 02:33:45,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:33:46,227 INFO L134 CoverageAnalysis]: Checked inductivity of 452 backedges. 47 proven. 34 refuted. 0 times theorem prover too weak. 371 trivial. 0 not checked. [2022-11-22 02:33:46,227 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:33:47,038 INFO L134 CoverageAnalysis]: Checked inductivity of 452 backedges. 63 proven. 17 refuted. 0 times theorem prover too weak. 372 trivial. 0 not checked. [2022-11-22 02:33:47,038 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:33:47,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1461319592] [2022-11-22 02:33:47,038 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:33:47,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1092298534] [2022-11-22 02:33:47,039 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1092298534] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:33:47,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2055025273] [2022-11-22 02:33:47,040 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-22 02:33:47,040 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:33:47,040 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:33:47,040 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:33:47,041 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs