./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound50.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 38b53e6a 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_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur --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 fc71ae13b1bed24e074eb2de07c8f2064aa903343708c3aabf1b928078c9e7f6 --- 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-38b53e6 [2022-11-25 23:40:02,865 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-25 23:40:02,867 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-25 23:40:02,901 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-25 23:40:02,902 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-25 23:40:02,903 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-25 23:40:02,904 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-25 23:40:02,906 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-25 23:40:02,907 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-25 23:40:02,908 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-25 23:40:02,909 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-25 23:40:02,910 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-25 23:40:02,911 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-25 23:40:02,912 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-25 23:40:02,913 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-25 23:40:02,914 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-25 23:40:02,915 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-25 23:40:02,916 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-25 23:40:02,917 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-25 23:40:02,919 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-25 23:40:02,921 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-25 23:40:02,922 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-25 23:40:02,923 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-25 23:40:02,924 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-25 23:40:02,928 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-25 23:40:02,928 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-25 23:40:02,928 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-25 23:40:02,929 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-25 23:40:02,930 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-25 23:40:02,931 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-25 23:40:02,931 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-25 23:40:02,932 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-25 23:40:02,933 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-25 23:40:02,933 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-25 23:40:02,937 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-25 23:40:02,937 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-25 23:40:02,938 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-25 23:40:02,939 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-25 23:40:02,939 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-25 23:40:02,940 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-25 23:40:02,941 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-25 23:40:02,943 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-25 23:40:02,980 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-25 23:40:02,980 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-25 23:40:02,981 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-25 23:40:02,981 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-25 23:40:02,981 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-25 23:40:02,982 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-25 23:40:02,982 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-25 23:40:02,982 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-25 23:40:02,985 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-25 23:40:02,986 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-25 23:40:02,987 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-25 23:40:02,987 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-25 23:40:02,987 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-25 23:40:02,987 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-25 23:40:02,987 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-25 23:40:02,988 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-25 23:40:02,988 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-25 23:40:02,988 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-25 23:40:02,989 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-25 23:40:02,989 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-25 23:40:02,989 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-25 23:40:02,989 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-25 23:40:02,990 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-25 23:40:02,990 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-25 23:40:02,990 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-25 23:40:02,991 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-25 23:40:02,991 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-25 23:40:02,991 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-25 23:40:02,991 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-25 23:40:02,991 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-25 23:40:02,992 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-25 23:40:02,992 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-25 23:40:02,992 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 23:40:02,992 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-25 23:40:02,992 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-25 23:40:02,993 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-25 23:40:02,993 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-25 23:40:02,994 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-25 23:40:02,994 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-25 23:40:02,994 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-25 23:40:02,994 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-25 23:40:02,994 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_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> fc71ae13b1bed24e074eb2de07c8f2064aa903343708c3aabf1b928078c9e7f6 [2022-11-25 23:40:03,234 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-25 23:40:03,256 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-25 23:40:03,259 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-25 23:40:03,260 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-25 23:40:03,261 INFO L275 PluginConnector]: CDTParser initialized [2022-11-25 23:40:03,262 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound50.c [2022-11-25 23:40:06,331 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-25 23:40:06,580 INFO L351 CDTParser]: Found 1 translation units. [2022-11-25 23:40:06,581 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound50.c [2022-11-25 23:40:06,587 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/data/74c1f32a0/3c7d3b6741194df999720ffb63b15ed6/FLAG82429ccb3 [2022-11-25 23:40:06,602 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/data/74c1f32a0/3c7d3b6741194df999720ffb63b15ed6 [2022-11-25 23:40:06,604 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-25 23:40:06,606 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-25 23:40:06,607 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-25 23:40:06,607 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-25 23:40:06,611 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-25 23:40:06,612 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 11:40:06" (1/1) ... [2022-11-25 23:40:06,613 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4caa436c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:40:06, skipping insertion in model container [2022-11-25 23:40:06,613 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 11:40:06" (1/1) ... [2022-11-25 23:40:06,621 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-25 23:40:06,646 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-25 23:40:06,825 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_d657d12d-26ba-4148-be8c-83713bfd0570/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound50.c[490,503] [2022-11-25 23:40:06,845 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 23:40:06,854 INFO L203 MainTranslator]: Completed pre-run [2022-11-25 23:40:06,867 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_d657d12d-26ba-4148-be8c-83713bfd0570/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound50.c[490,503] [2022-11-25 23:40:06,877 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 23:40:06,891 INFO L208 MainTranslator]: Completed translation [2022-11-25 23:40:06,891 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:40:06 WrapperNode [2022-11-25 23:40:06,891 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-25 23:40:06,893 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-25 23:40:06,893 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-25 23:40:06,893 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-25 23:40:06,901 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:40:06" (1/1) ... [2022-11-25 23:40:06,907 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:40:06" (1/1) ... [2022-11-25 23:40:06,926 INFO L138 Inliner]: procedures = 14, calls = 19, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 77 [2022-11-25 23:40:06,926 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-25 23:40:06,927 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-25 23:40:06,927 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-25 23:40:06,928 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-25 23:40:06,937 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:40:06" (1/1) ... [2022-11-25 23:40:06,937 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:40:06" (1/1) ... [2022-11-25 23:40:06,939 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:40:06" (1/1) ... [2022-11-25 23:40:06,939 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:40:06" (1/1) ... [2022-11-25 23:40:06,943 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:40:06" (1/1) ... [2022-11-25 23:40:06,947 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:40:06" (1/1) ... [2022-11-25 23:40:06,948 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:40:06" (1/1) ... [2022-11-25 23:40:06,949 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:40:06" (1/1) ... [2022-11-25 23:40:06,951 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-25 23:40:06,951 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-25 23:40:06,952 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-25 23:40:06,952 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-25 23:40:06,953 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:40:06" (1/1) ... [2022-11-25 23:40:06,959 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 23:40:06,971 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:40:06,983 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-25 23:40:06,991 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-25 23:40:07,018 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-25 23:40:07,018 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-25 23:40:07,018 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-25 23:40:07,019 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-25 23:40:07,019 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-25 23:40:07,019 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-25 23:40:07,019 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-25 23:40:07,019 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-25 23:40:07,085 INFO L235 CfgBuilder]: Building ICFG [2022-11-25 23:40:07,087 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-25 23:40:07,349 INFO L276 CfgBuilder]: Performing block encoding [2022-11-25 23:40:07,400 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-25 23:40:07,403 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-25 23:40:07,406 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 11:40:07 BoogieIcfgContainer [2022-11-25 23:40:07,407 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-25 23:40:07,410 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-25 23:40:07,412 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-25 23:40:07,416 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-25 23:40:07,416 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 11:40:06" (1/3) ... [2022-11-25 23:40:07,419 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79714441 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 11:40:07, skipping insertion in model container [2022-11-25 23:40:07,419 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:40:06" (2/3) ... [2022-11-25 23:40:07,420 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79714441 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 11:40:07, skipping insertion in model container [2022-11-25 23:40:07,420 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 11:40:07" (3/3) ... [2022-11-25 23:40:07,421 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd2-ll_valuebound50.c [2022-11-25 23:40:07,444 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-25 23:40:07,444 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-25 23:40:07,512 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-25 23:40:07,520 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;@48e4ea26, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-25 23:40:07,521 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-25 23:40:07,525 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 16 states have internal predecessors, (20), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-25 23:40:07,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-25 23:40:07,535 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:40:07,535 INFO L195 NwaCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:40:07,537 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:40:07,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:40:07,546 INFO L85 PathProgramCache]: Analyzing trace with hash 966807424, now seen corresponding path program 1 times [2022-11-25 23:40:07,557 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:40:07,558 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2002154210] [2022-11-25 23:40:07,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:07,558 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:40:07,690 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:40:07,691 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1811883537] [2022-11-25 23:40:07,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:07,692 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:07,692 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:40:07,695 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:40:07,714 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-25 23:40:07,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:40:07,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-25 23:40:07,840 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:40:07,878 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-25 23:40:07,880 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 23:40:07,881 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:40:07,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2002154210] [2022-11-25 23:40:07,882 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:40:07,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1811883537] [2022-11-25 23:40:07,883 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1811883537] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:40:07,883 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:40:07,884 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-25 23:40:07,887 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1750890805] [2022-11-25 23:40:07,888 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:40:07,893 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-25 23:40:07,894 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:40:07,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-25 23:40:07,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-25 23:40:07,926 INFO L87 Difference]: Start difference. First operand has 30 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 16 states have internal predecessors, (20), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 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) [2022-11-25 23:40:07,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:40:07,962 INFO L93 Difference]: Finished difference Result 49 states and 78 transitions. [2022-11-25 23:40:07,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-25 23:40:07,969 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 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 26 [2022-11-25 23:40:07,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:40:07,987 INFO L225 Difference]: With dead ends: 49 [2022-11-25 23:40:07,987 INFO L226 Difference]: Without dead ends: 28 [2022-11-25 23:40:07,990 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-25 23:40:08,002 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:40:08,004 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 38 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:40:08,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-25 23:40:08,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-11-25 23:40:08,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 15 states have internal predecessors, (16), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-11-25 23:40:08,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 39 transitions. [2022-11-25 23:40:08,076 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 39 transitions. Word has length 26 [2022-11-25 23:40:08,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:40:08,080 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 39 transitions. [2022-11-25 23:40:08,080 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 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) [2022-11-25 23:40:08,080 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 39 transitions. [2022-11-25 23:40:08,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-25 23:40:08,083 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:40:08,083 INFO L195 NwaCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:40:08,090 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-25 23:40:08,289 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-25 23:40:08,290 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:40:08,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:40:08,291 INFO L85 PathProgramCache]: Analyzing trace with hash 1643993843, now seen corresponding path program 1 times [2022-11-25 23:40:08,291 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:40:08,291 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [511438154] [2022-11-25 23:40:08,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:08,292 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:40:08,333 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:40:08,333 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [18982527] [2022-11-25 23:40:08,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:08,334 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:08,334 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:40:08,342 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:40:08,345 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-25 23:40:08,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:40:08,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-25 23:40:08,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:40:08,528 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-25 23:40:08,528 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:40:08,646 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-25 23:40:08,647 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:40:08,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [511438154] [2022-11-25 23:40:08,647 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:40:08,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [18982527] [2022-11-25 23:40:08,648 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [18982527] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:40:08,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [151564794] [2022-11-25 23:40:08,676 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-25 23:40:08,676 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:40:08,680 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:40:08,699 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:40:08,699 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:40:09,778 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-25 23:40:09,803 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:40:10,867 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [151564794] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:40:10,867 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:40:10,867 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [5, 5] total 14 [2022-11-25 23:40:10,868 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290340278] [2022-11-25 23:40:10,868 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:40:10,869 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-25 23:40:10,869 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:40:10,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-25 23:40:10,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2022-11-25 23:40:10,871 INFO L87 Difference]: Start difference. First operand 28 states and 39 transitions. Second operand has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-11-25 23:40:11,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:40:11,101 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2022-11-25 23:40:11,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-25 23:40:11,102 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 27 [2022-11-25 23:40:11,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:40:11,104 INFO L225 Difference]: With dead ends: 38 [2022-11-25 23:40:11,105 INFO L226 Difference]: Without dead ends: 30 [2022-11-25 23:40:11,107 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 62 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2022-11-25 23:40:11,109 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 37 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:40:11,113 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 48 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:40:11,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-11-25 23:40:11,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-11-25 23:40:11,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 15 states have (on average 1.2) internal successors, (18), 16 states have internal predecessors, (18), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-11-25 23:40:11,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 41 transitions. [2022-11-25 23:40:11,140 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 41 transitions. Word has length 27 [2022-11-25 23:40:11,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:40:11,142 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 41 transitions. [2022-11-25 23:40:11,142 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-11-25 23:40:11,142 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 41 transitions. [2022-11-25 23:40:11,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-25 23:40:11,143 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:40:11,144 INFO L195 NwaCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:40:11,155 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-25 23:40:11,350 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:11,350 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:40:11,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:40:11,350 INFO L85 PathProgramCache]: Analyzing trace with hash -575116102, now seen corresponding path program 1 times [2022-11-25 23:40:11,351 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:40:11,351 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [877187346] [2022-11-25 23:40:11,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:11,351 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:40:11,366 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:40:11,366 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [390556590] [2022-11-25 23:40:11,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:11,367 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:11,367 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:40:11,368 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:40:11,379 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-25 23:40:11,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:40:11,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-25 23:40:11,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:40:11,507 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-25 23:40:11,507 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:40:11,581 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-25 23:40:11,582 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:40:11,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [877187346] [2022-11-25 23:40:11,582 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:40:11,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [390556590] [2022-11-25 23:40:11,583 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [390556590] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-25 23:40:11,583 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-25 23:40:11,583 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 11 [2022-11-25 23:40:11,583 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1763863438] [2022-11-25 23:40:11,583 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:40:11,585 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-25 23:40:11,585 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:40:11,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-25 23:40:11,586 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2022-11-25 23:40:11,586 INFO L87 Difference]: Start difference. First operand 30 states and 41 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 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) [2022-11-25 23:40:11,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:40:11,676 INFO L93 Difference]: Finished difference Result 36 states and 46 transitions. [2022-11-25 23:40:11,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-25 23:40:11,677 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 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 28 [2022-11-25 23:40:11,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:40:11,678 INFO L225 Difference]: With dead ends: 36 [2022-11-25 23:40:11,678 INFO L226 Difference]: Without dead ends: 34 [2022-11-25 23:40:11,679 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-11-25 23:40:11,680 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 7 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:40:11,681 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 101 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:40:11,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-11-25 23:40:11,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2022-11-25 23:40:11,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 19 states have internal predecessors, (21), 12 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-11-25 23:40:11,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 44 transitions. [2022-11-25 23:40:11,704 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 44 transitions. Word has length 28 [2022-11-25 23:40:11,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:40:11,705 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 44 transitions. [2022-11-25 23:40:11,705 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 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) [2022-11-25 23:40:11,705 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 44 transitions. [2022-11-25 23:40:11,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-25 23:40:11,707 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:40:11,707 INFO L195 NwaCegarLoop]: trace histogram [6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:40:11,719 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-11-25 23:40:11,912 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:11,913 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:40:11,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:40:11,914 INFO L85 PathProgramCache]: Analyzing trace with hash -1810277145, now seen corresponding path program 1 times [2022-11-25 23:40:11,914 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:40:11,914 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1610646303] [2022-11-25 23:40:11,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:11,915 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:40:11,939 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:40:11,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [268984323] [2022-11-25 23:40:11,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:11,939 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:11,940 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:40:11,946 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:40:11,967 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-25 23:40:12,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:40:12,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 27 conjunts are in the unsatisfiable core [2022-11-25 23:40:12,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:40:12,184 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-25 23:40:12,184 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:40:12,310 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-25 23:40:12,310 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:40:12,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1610646303] [2022-11-25 23:40:12,310 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:40:12,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [268984323] [2022-11-25 23:40:12,311 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [268984323] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-25 23:40:12,311 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-25 23:40:12,311 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 12 [2022-11-25 23:40:12,311 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [145102664] [2022-11-25 23:40:12,312 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:40:12,312 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-25 23:40:12,312 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:40:12,313 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-25 23:40:12,313 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-11-25 23:40:12,313 INFO L87 Difference]: Start difference. First operand 34 states and 44 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-25 23:40:12,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:40:12,397 INFO L93 Difference]: Finished difference Result 47 states and 61 transitions. [2022-11-25 23:40:12,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-25 23:40:12,398 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 33 [2022-11-25 23:40:12,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:40:12,399 INFO L225 Difference]: With dead ends: 47 [2022-11-25 23:40:12,399 INFO L226 Difference]: Without dead ends: 45 [2022-11-25 23:40:12,400 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2022-11-25 23:40:12,401 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 6 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:40:12,401 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 122 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:40:12,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-11-25 23:40:12,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2022-11-25 23:40:12,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 23 states have (on average 1.173913043478261) internal successors, (27), 24 states have internal predecessors, (27), 16 states have call successors, (16), 4 states have call predecessors, (16), 4 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-11-25 23:40:12,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 58 transitions. [2022-11-25 23:40:12,432 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 58 transitions. Word has length 33 [2022-11-25 23:40:12,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:40:12,433 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 58 transitions. [2022-11-25 23:40:12,433 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-11-25 23:40:12,433 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 58 transitions. [2022-11-25 23:40:12,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-11-25 23:40:12,436 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:40:12,436 INFO L195 NwaCegarLoop]: trace histogram [6, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:40:12,447 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-25 23:40:12,642 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:12,642 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:40:12,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:40:12,643 INFO L85 PathProgramCache]: Analyzing trace with hash -1313498982, now seen corresponding path program 1 times [2022-11-25 23:40:12,643 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:40:12,643 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [842675723] [2022-11-25 23:40:12,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:12,644 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:40:12,657 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:40:12,657 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2087323070] [2022-11-25 23:40:12,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:12,657 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:12,657 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:40:12,658 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:40:12,678 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-25 23:40:12,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:40:12,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 33 conjunts are in the unsatisfiable core [2022-11-25 23:40:12,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:40:13,063 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-25 23:40:13,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:40:13,261 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2022-11-25 23:40:13,262 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:40:13,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [842675723] [2022-11-25 23:40:13,262 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:40:13,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2087323070] [2022-11-25 23:40:13,262 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2087323070] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-25 23:40:13,262 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-25 23:40:13,263 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [12] total 15 [2022-11-25 23:40:13,263 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215562336] [2022-11-25 23:40:13,263 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:40:13,263 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-25 23:40:13,263 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:40:13,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-25 23:40:13,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2022-11-25 23:40:13,264 INFO L87 Difference]: Start difference. First operand 44 states and 58 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2022-11-25 23:40:13,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:40:13,390 INFO L93 Difference]: Finished difference Result 51 states and 64 transitions. [2022-11-25 23:40:13,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-25 23:40:13,391 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 38 [2022-11-25 23:40:13,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:40:13,394 INFO L225 Difference]: With dead ends: 51 [2022-11-25 23:40:13,394 INFO L226 Difference]: Without dead ends: 49 [2022-11-25 23:40:13,394 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2022-11-25 23:40:13,399 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 7 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:40:13,399 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 128 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:40:13,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-11-25 23:40:13,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2022-11-25 23:40:13,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 27 states have internal predecessors, (30), 16 states have call successors, (16), 5 states have call predecessors, (16), 5 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-11-25 23:40:13,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 61 transitions. [2022-11-25 23:40:13,462 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 61 transitions. Word has length 38 [2022-11-25 23:40:13,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:40:13,462 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 61 transitions. [2022-11-25 23:40:13,462 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2022-11-25 23:40:13,463 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 61 transitions. [2022-11-25 23:40:13,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-25 23:40:13,464 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:40:13,464 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 3, 3, 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] [2022-11-25 23:40:13,474 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-25 23:40:13,669 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:13,670 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:40:13,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:40:13,670 INFO L85 PathProgramCache]: Analyzing trace with hash -1793667961, now seen corresponding path program 1 times [2022-11-25 23:40:13,670 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:40:13,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1885567941] [2022-11-25 23:40:13,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:13,671 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:40:13,688 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:40:13,689 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1799188502] [2022-11-25 23:40:13,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:13,689 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:13,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:40:13,690 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:40:13,710 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-25 23:40:13,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:40:13,754 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-25 23:40:13,756 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:40:14,033 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 11 proven. 6 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2022-11-25 23:40:14,033 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:40:14,138 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:40:14,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1885567941] [2022-11-25 23:40:14,138 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:40:14,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1799188502] [2022-11-25 23:40:14,139 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1799188502] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:40:14,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1807737360] [2022-11-25 23:40:14,142 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-25 23:40:14,142 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:40:14,142 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:40:14,142 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:40:14,143 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:40:15,083 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2022-11-25 23:40:15,092 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-25 23:40:15,108 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:40:17,074 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1807737360] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:40:17,075 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-25 23:40:17,075 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [10] total 22 [2022-11-25 23:40:17,075 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [644229259] [2022-11-25 23:40:17,075 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:40:17,076 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-25 23:40:17,076 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:40:17,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-25 23:40:17,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=483, Unknown=0, NotChecked=0, Total=600 [2022-11-25 23:40:17,077 INFO L87 Difference]: Start difference. First operand 48 states and 61 transitions. Second operand has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) [2022-11-25 23:40:17,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:40:17,439 INFO L93 Difference]: Finished difference Result 73 states and 87 transitions. [2022-11-25 23:40:17,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-25 23:40:17,441 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) Word has length 43 [2022-11-25 23:40:17,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:40:17,443 INFO L225 Difference]: With dead ends: 73 [2022-11-25 23:40:17,443 INFO L226 Difference]: Without dead ends: 71 [2022-11-25 23:40:17,444 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 54 SyntacticMatches, 13 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 280 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=117, Invalid=483, Unknown=0, NotChecked=0, Total=600 [2022-11-25 23:40:17,446 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 26 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:40:17,446 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 50 Invalid, 213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:40:17,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-11-25 23:40:17,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 69. [2022-11-25 23:40:17,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 41 states have internal predecessors, (43), 20 states have call successors, (20), 9 states have call predecessors, (20), 9 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2022-11-25 23:40:17,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 82 transitions. [2022-11-25 23:40:17,491 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 82 transitions. Word has length 43 [2022-11-25 23:40:17,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:40:17,491 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 82 transitions. [2022-11-25 23:40:17,493 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) [2022-11-25 23:40:17,493 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 82 transitions. [2022-11-25 23:40:17,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-25 23:40:17,501 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:40:17,501 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 4, 4, 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, 1, 1, 1] [2022-11-25 23:40:17,515 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-25 23:40:17,707 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:17,707 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:40:17,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:40:17,708 INFO L85 PathProgramCache]: Analyzing trace with hash 434944611, now seen corresponding path program 1 times [2022-11-25 23:40:17,708 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:40:17,708 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [774166690] [2022-11-25 23:40:17,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:17,708 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:40:17,718 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:40:17,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2044290615] [2022-11-25 23:40:17,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:17,719 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:17,719 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:40:17,720 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:40:17,725 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-25 23:40:17,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:40:17,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-25 23:40:17,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:40:17,835 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-11-25 23:40:17,835 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:40:17,917 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-11-25 23:40:17,917 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:40:17,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [774166690] [2022-11-25 23:40:17,917 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:40:17,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2044290615] [2022-11-25 23:40:17,918 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2044290615] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:40:17,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1871474548] [2022-11-25 23:40:17,923 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-25 23:40:17,923 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:40:17,924 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:40:17,924 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:40:17,924 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:40:30,461 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 51 for LOIs [2022-11-25 23:40:30,487 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-25 23:40:30,501 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:40:35,051 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2208#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:40:35,051 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:40:35,051 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:40:35,051 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2022-11-25 23:40:35,051 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1690391439] [2022-11-25 23:40:35,051 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 23:40:35,052 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-25 23:40:35,052 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:40:35,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-25 23:40:35,053 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=394, Unknown=0, NotChecked=0, Total=506 [2022-11-25 23:40:35,053 INFO L87 Difference]: Start difference. First operand 69 states and 82 transitions. Second operand has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2022-11-25 23:40:35,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:40:35,341 INFO L93 Difference]: Finished difference Result 111 states and 148 transitions. [2022-11-25 23:40:35,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-25 23:40:35,342 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 52 [2022-11-25 23:40:35,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:40:35,343 INFO L225 Difference]: With dead ends: 111 [2022-11-25 23:40:35,343 INFO L226 Difference]: Without dead ends: 103 [2022-11-25 23:40:35,344 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 118 SyntacticMatches, 15 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 256 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=147, Invalid=555, Unknown=0, NotChecked=0, Total=702 [2022-11-25 23:40:35,345 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 34 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 190 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:40:35,345 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 177 Invalid, 190 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 143 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:40:35,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2022-11-25 23:40:35,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 94. [2022-11-25 23:40:35,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 52 states have (on average 1.1730769230769231) internal successors, (61), 53 states have internal predecessors, (61), 32 states have call successors, (32), 9 states have call predecessors, (32), 9 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2022-11-25 23:40:35,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 124 transitions. [2022-11-25 23:40:35,379 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 124 transitions. Word has length 52 [2022-11-25 23:40:35,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:40:35,380 INFO L495 AbstractCegarLoop]: Abstraction has 94 states and 124 transitions. [2022-11-25 23:40:35,380 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2022-11-25 23:40:35,380 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 124 transitions. [2022-11-25 23:40:35,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-25 23:40:35,381 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:40:35,381 INFO L195 NwaCegarLoop]: trace histogram [6, 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, 1, 1, 1, 1] [2022-11-25 23:40:35,391 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-11-25 23:40:35,587 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:35,587 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:40:35,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:40:35,588 INFO L85 PathProgramCache]: Analyzing trace with hash -243308457, now seen corresponding path program 1 times [2022-11-25 23:40:35,588 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:40:35,588 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [513897380] [2022-11-25 23:40:35,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:35,588 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:40:35,608 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:40:35,608 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1744784775] [2022-11-25 23:40:35,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:35,608 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:35,608 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:40:35,615 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:40:35,634 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-25 23:40:35,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:40:35,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-25 23:40:35,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:40:35,827 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 23 proven. 10 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2022-11-25 23:40:35,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:40:36,000 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2022-11-25 23:40:36,001 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:40:36,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [513897380] [2022-11-25 23:40:36,001 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:40:36,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1744784775] [2022-11-25 23:40:36,002 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1744784775] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:40:36,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1932715548] [2022-11-25 23:40:36,006 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-25 23:40:36,006 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:40:36,007 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:40:36,007 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:40:36,007 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:40:46,372 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2022-11-25 23:40:46,380 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-25 23:40:46,391 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:40:51,825 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1932715548] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:40:51,826 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:40:51,826 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [9, 7] total 27 [2022-11-25 23:40:51,826 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1106937358] [2022-11-25 23:40:51,827 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:40:51,827 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-25 23:40:51,827 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:40:51,828 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-25 23:40:51,828 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=573, Unknown=0, NotChecked=0, Total=702 [2022-11-25 23:40:51,829 INFO L87 Difference]: Start difference. First operand 94 states and 124 transitions. Second operand has 16 states, 10 states have (on average 1.4) internal successors, (14), 9 states have internal predecessors, (14), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) [2022-11-25 23:40:52,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:40:52,978 INFO L93 Difference]: Finished difference Result 113 states and 146 transitions. [2022-11-25 23:40:52,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-25 23:40:52,979 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 10 states have (on average 1.4) internal successors, (14), 9 states have internal predecessors, (14), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) Word has length 58 [2022-11-25 23:40:52,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:40:52,980 INFO L225 Difference]: With dead ends: 113 [2022-11-25 23:40:52,980 INFO L226 Difference]: Without dead ends: 111 [2022-11-25 23:40:52,981 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 129 SyntacticMatches, 18 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 423 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=142, Invalid=614, Unknown=0, NotChecked=0, Total=756 [2022-11-25 23:40:52,981 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 30 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 246 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 246 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-25 23:40:52,982 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 59 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 246 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-25 23:40:52,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2022-11-25 23:40:53,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2022-11-25 23:40:53,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 63 states have (on average 1.1587301587301588) internal successors, (73), 64 states have internal predecessors, (73), 36 states have call successors, (36), 11 states have call predecessors, (36), 11 states have return successors, (35), 35 states have call predecessors, (35), 35 states have call successors, (35) [2022-11-25 23:40:53,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 144 transitions. [2022-11-25 23:40:53,021 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 144 transitions. Word has length 58 [2022-11-25 23:40:53,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:40:53,021 INFO L495 AbstractCegarLoop]: Abstraction has 111 states and 144 transitions. [2022-11-25 23:40:53,022 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 10 states have (on average 1.4) internal successors, (14), 9 states have internal predecessors, (14), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) [2022-11-25 23:40:53,022 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 144 transitions. [2022-11-25 23:40:53,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-11-25 23:40:53,023 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:40:53,023 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 6, 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, 1] [2022-11-25 23:40:53,028 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-25 23:40:53,224 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-25 23:40:53,225 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:40:53,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:40:53,225 INFO L85 PathProgramCache]: Analyzing trace with hash 1984692712, now seen corresponding path program 1 times [2022-11-25 23:40:53,225 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:40:53,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [572888927] [2022-11-25 23:40:53,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:53,226 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:40:53,234 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:40:53,235 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [798191878] [2022-11-25 23:40:53,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:40:53,235 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:40:53,235 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:40:53,236 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:40:53,252 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-25 23:40:53,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:40:53,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-25 23:40:53,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:40:53,478 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2022-11-25 23:40:53,478 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:40:53,593 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2022-11-25 23:40:53,594 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:40:53,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [572888927] [2022-11-25 23:40:53,594 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:40:53,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [798191878] [2022-11-25 23:40:53,594 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [798191878] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:40:53,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [373018117] [2022-11-25 23:40:53,596 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-25 23:40:53,597 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:40:53,597 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:40:53,597 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:40:53,597 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:40:58,699 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-25 23:40:58,749 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-25 23:40:58,764 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:41:05,138 WARN L233 SmtUtils]: Spent 5.10s on a formula simplification. DAG size of input: 170 DAG size of output: 134 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:41:06,482 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3655#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:41:06,482 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:41:06,483 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:41:06,483 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2022-11-25 23:41:06,483 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1326117225] [2022-11-25 23:41:06,483 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 23:41:06,484 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-25 23:41:06,484 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:41:06,485 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-25 23:41:06,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=579, Unknown=0, NotChecked=0, Total=702 [2022-11-25 23:41:06,485 INFO L87 Difference]: Start difference. First operand 111 states and 144 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) [2022-11-25 23:41:06,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:41:06,743 INFO L93 Difference]: Finished difference Result 122 states and 158 transitions. [2022-11-25 23:41:06,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-25 23:41:06,747 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) Word has length 65 [2022-11-25 23:41:06,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:41:06,750 INFO L225 Difference]: With dead ends: 122 [2022-11-25 23:41:06,750 INFO L226 Difference]: Without dead ends: 120 [2022-11-25 23:41:06,751 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 157 SyntacticMatches, 11 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=139, Invalid=673, Unknown=0, NotChecked=0, Total=812 [2022-11-25 23:41:06,751 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 14 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:41:06,752 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 103 Invalid, 143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 141 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:41:06,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2022-11-25 23:41:06,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2022-11-25 23:41:06,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 67 states have (on average 1.1492537313432836) internal successors, (77), 69 states have internal predecessors, (77), 40 states have call successors, (40), 12 states have call predecessors, (40), 12 states have return successors, (39), 38 states have call predecessors, (39), 39 states have call successors, (39) [2022-11-25 23:41:06,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 156 transitions. [2022-11-25 23:41:06,806 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 156 transitions. Word has length 65 [2022-11-25 23:41:06,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:41:06,806 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 156 transitions. [2022-11-25 23:41:06,807 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) [2022-11-25 23:41:06,807 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 156 transitions. [2022-11-25 23:41:06,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-11-25 23:41:06,808 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:41:06,808 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 6, 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, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:41:06,813 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-11-25 23:41:07,013 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:41:07,013 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:41:07,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:41:07,014 INFO L85 PathProgramCache]: Analyzing trace with hash -2003369438, now seen corresponding path program 1 times [2022-11-25 23:41:07,014 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:41:07,014 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1598100644] [2022-11-25 23:41:07,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:41:07,014 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:41:07,025 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:41:07,025 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [493474236] [2022-11-25 23:41:07,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:41:07,026 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:41:07,026 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:41:07,027 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:41:07,029 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-25 23:41:07,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:41:07,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 45 conjunts are in the unsatisfiable core [2022-11-25 23:41:07,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:41:07,664 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 18 proven. 11 refuted. 0 times theorem prover too weak. 137 trivial. 0 not checked. [2022-11-25 23:41:07,664 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:41:08,417 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2022-11-25 23:41:08,417 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:41:08,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1598100644] [2022-11-25 23:41:08,417 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:41:08,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [493474236] [2022-11-25 23:41:08,417 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [493474236] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:41:08,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1479365997] [2022-11-25 23:41:08,420 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-25 23:41:08,420 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:41:08,420 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:41:08,420 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:41:08,420 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:41:11,366 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-25 23:41:11,409 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-25 23:41:11,422 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:41:49,392 WARN L233 SmtUtils]: Spent 32.76s on a formula simplification. DAG size of input: 180 DAG size of output: 147 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:42:23,366 WARN L233 SmtUtils]: Spent 26.52s on a formula simplification. DAG size of input: 77 DAG size of output: 75 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:42:31,742 WARN L233 SmtUtils]: Spent 5.29s on a formula simplification. DAG size of input: 178 DAG size of output: 87 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:42:31,780 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4507#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:42:31,781 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:42:31,781 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:42:31,781 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 20 [2022-11-25 23:42:31,781 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79665789] [2022-11-25 23:42:31,781 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 23:42:31,782 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-25 23:42:31,782 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:42:31,783 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-25 23:42:31,783 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=1364, Unknown=0, NotChecked=0, Total=1560 [2022-11-25 23:42:31,784 INFO L87 Difference]: Start difference. First operand 120 states and 156 transitions. Second operand has 20 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 10 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2022-11-25 23:42:43,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:42:43,975 INFO L93 Difference]: Finished difference Result 199 states and 279 transitions. [2022-11-25 23:42:43,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-25 23:42:43,976 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 10 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) Word has length 74 [2022-11-25 23:42:43,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:42:43,978 INFO L225 Difference]: With dead ends: 199 [2022-11-25 23:42:43,978 INFO L226 Difference]: Without dead ends: 197 [2022-11-25 23:42:43,979 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 172 SyntacticMatches, 10 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1387 ImplicationChecksByTransitivity, 88.4s TimeCoverageRelationStatistics Valid=440, Invalid=3100, Unknown=0, NotChecked=0, Total=3540 [2022-11-25 23:42:43,980 INFO L413 NwaCegarLoop]: 65 mSDtfsCounter, 92 mSDsluCounter, 250 mSDsCounter, 0 mSdLazyCounter, 1059 mSolverCounterSat, 157 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 315 SdHoareTripleChecker+Invalid, 1216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 157 IncrementalHoareTripleChecker+Valid, 1059 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.6s IncrementalHoareTripleChecker+Time [2022-11-25 23:42:43,981 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [96 Valid, 315 Invalid, 1216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [157 Valid, 1059 Invalid, 0 Unknown, 0 Unchecked, 4.6s Time] [2022-11-25 23:42:43,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2022-11-25 23:42:44,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 187. [2022-11-25 23:42:44,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 99 states have (on average 1.2222222222222223) internal successors, (121), 101 states have internal predecessors, (121), 73 states have call successors, (73), 14 states have call predecessors, (73), 14 states have return successors, (72), 71 states have call predecessors, (72), 72 states have call successors, (72) [2022-11-25 23:42:44,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 266 transitions. [2022-11-25 23:42:44,077 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 266 transitions. Word has length 74 [2022-11-25 23:42:44,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:42:44,078 INFO L495 AbstractCegarLoop]: Abstraction has 187 states and 266 transitions. [2022-11-25 23:42:44,078 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 10 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2022-11-25 23:42:44,078 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 266 transitions. [2022-11-25 23:42:44,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-11-25 23:42:44,079 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:42:44,080 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 6, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:42:44,086 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-25 23:42:44,285 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-25 23:42:44,286 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:42:44,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:42:44,286 INFO L85 PathProgramCache]: Analyzing trace with hash -134461569, now seen corresponding path program 1 times [2022-11-25 23:42:44,286 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:42:44,286 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1337169658] [2022-11-25 23:42:44,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:42:44,287 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:42:44,306 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:42:44,307 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1471998610] [2022-11-25 23:42:44,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:42:44,307 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:42:44,307 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:42:44,308 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:42:44,322 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-25 23:42:44,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:42:44,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 27 conjunts are in the unsatisfiable core [2022-11-25 23:42:44,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:42:44,780 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 39 proven. 16 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2022-11-25 23:42:44,780 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:42:45,249 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 39 proven. 7 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2022-11-25 23:42:45,249 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:42:45,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1337169658] [2022-11-25 23:42:45,249 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:42:45,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1471998610] [2022-11-25 23:42:45,250 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1471998610] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:42:45,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1414525252] [2022-11-25 23:42:45,252 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-25 23:42:45,252 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:42:45,252 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:42:45,253 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:42:45,253 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:42:48,892 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-25 23:42:48,896 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-25 23:42:48,908 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:43:09,859 WARN L233 SmtUtils]: Spent 16.94s on a formula simplification. DAG size of input: 83 DAG size of output: 76 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:43:22,460 WARN L233 SmtUtils]: Spent 11.49s on a formula simplification. DAG size of input: 85 DAG size of output: 76 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:43:23,237 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5666#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:43:23,237 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:43:23,238 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:43:23,238 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 8] total 19 [2022-11-25 23:43:23,238 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [547395573] [2022-11-25 23:43:23,238 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 23:43:23,239 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-25 23:43:23,239 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:43:23,239 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-25 23:43:23,240 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=1367, Unknown=0, NotChecked=0, Total=1560 [2022-11-25 23:43:23,241 INFO L87 Difference]: Start difference. First operand 187 states and 266 transitions. Second operand has 19 states, 18 states have (on average 2.0) internal successors, (36), 15 states have internal predecessors, (36), 9 states have call successors, (26), 3 states have call predecessors, (26), 3 states have return successors, (26), 9 states have call predecessors, (26), 9 states have call successors, (26) [2022-11-25 23:43:28,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:43:28,256 INFO L93 Difference]: Finished difference Result 231 states and 326 transitions. [2022-11-25 23:43:28,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-25 23:43:28,256 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.0) internal successors, (36), 15 states have internal predecessors, (36), 9 states have call successors, (26), 3 states have call predecessors, (26), 3 states have return successors, (26), 9 states have call predecessors, (26), 9 states have call successors, (26) Word has length 79 [2022-11-25 23:43:28,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:43:28,259 INFO L225 Difference]: With dead ends: 231 [2022-11-25 23:43:28,259 INFO L226 Difference]: Without dead ends: 225 [2022-11-25 23:43:28,260 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 199 SyntacticMatches, 3 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 869 ImplicationChecksByTransitivity, 37.8s TimeCoverageRelationStatistics Valid=329, Invalid=2323, Unknown=0, NotChecked=0, Total=2652 [2022-11-25 23:43:28,261 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 66 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 643 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 159 SdHoareTripleChecker+Invalid, 757 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 643 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:43:28,262 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 159 Invalid, 757 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [114 Valid, 643 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-11-25 23:43:28,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2022-11-25 23:43:28,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 197. [2022-11-25 23:43:28,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 197 states, 108 states have (on average 1.1759259259259258) internal successors, (127), 109 states have internal predecessors, (127), 71 states have call successors, (71), 17 states have call predecessors, (71), 17 states have return successors, (70), 70 states have call predecessors, (70), 70 states have call successors, (70) [2022-11-25 23:43:28,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 268 transitions. [2022-11-25 23:43:28,352 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 268 transitions. Word has length 79 [2022-11-25 23:43:28,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:43:28,353 INFO L495 AbstractCegarLoop]: Abstraction has 197 states and 268 transitions. [2022-11-25 23:43:28,353 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.0) internal successors, (36), 15 states have internal predecessors, (36), 9 states have call successors, (26), 3 states have call predecessors, (26), 3 states have return successors, (26), 9 states have call predecessors, (26), 9 states have call successors, (26) [2022-11-25 23:43:28,353 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 268 transitions. [2022-11-25 23:43:28,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2022-11-25 23:43:28,354 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:43:28,355 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 6, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:43:28,366 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-25 23:43:28,559 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-25 23:43:28,560 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:43:28,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:43:28,560 INFO L85 PathProgramCache]: Analyzing trace with hash 145896886, now seen corresponding path program 1 times [2022-11-25 23:43:28,560 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:43:28,560 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [452236839] [2022-11-25 23:43:28,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:43:28,560 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:43:28,571 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:43:28,571 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [588488577] [2022-11-25 23:43:28,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:43:28,572 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:43:28,572 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:43:28,573 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:43:28,575 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-25 23:43:28,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:43:28,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 52 conjunts are in the unsatisfiable core [2022-11-25 23:43:28,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:43:29,577 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 53 proven. 22 refuted. 0 times theorem prover too weak. 215 trivial. 0 not checked. [2022-11-25 23:43:29,577 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:43:33,180 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 51 proven. 19 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2022-11-25 23:43:33,180 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:43:33,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [452236839] [2022-11-25 23:43:33,181 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:43:33,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [588488577] [2022-11-25 23:43:33,181 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [588488577] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:43:33,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1703330517] [2022-11-25 23:43:33,183 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-25 23:43:33,183 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:43:33,184 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:43:33,184 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:43:33,184 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:43:34,994 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 35 for LOIs [2022-11-25 23:43:35,033 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-25 23:43:35,047 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:44:21,436 WARN L233 SmtUtils]: Spent 38.37s on a formula simplification. DAG size of input: 178 DAG size of output: 149 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:44:52,079 WARN L233 SmtUtils]: Spent 11.08s on a formula simplification that was a NOOP. DAG size: 73 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:44:52,431 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6946#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:44:52,431 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:44:52,431 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:44:52,431 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11] total 21 [2022-11-25 23:44:52,432 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856119942] [2022-11-25 23:44:52,432 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 23:44:52,432 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-25 23:44:52,432 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:44:52,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-25 23:44:52,433 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=1422, Unknown=5, NotChecked=0, Total=1640 [2022-11-25 23:44:52,434 INFO L87 Difference]: Start difference. First operand 197 states and 268 transitions. Second operand has 21 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 18 states have internal predecessors, (39), 11 states have call successors, (33), 3 states have call predecessors, (33), 3 states have return successors, (32), 11 states have call predecessors, (32), 10 states have call successors, (32) [2022-11-25 23:45:06,519 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 [] [2022-11-25 23:45:13,824 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.44s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:45:18,806 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:45:25,645 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:45:27,690 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:45:28,838 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.14s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:45:30,858 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:45:31,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:45:31,576 INFO L93 Difference]: Finished difference Result 274 states and 382 transitions. [2022-11-25 23:45:31,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-25 23:45:31,577 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 18 states have internal predecessors, (39), 11 states have call successors, (33), 3 states have call predecessors, (33), 3 states have return successors, (32), 11 states have call predecessors, (32), 10 states have call successors, (32) Word has length 90 [2022-11-25 23:45:31,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:45:31,579 INFO L225 Difference]: With dead ends: 274 [2022-11-25 23:45:31,579 INFO L226 Difference]: Without dead ends: 272 [2022-11-25 23:45:31,580 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 215 SyntacticMatches, 14 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1542 ImplicationChecksByTransitivity, 97.6s TimeCoverageRelationStatistics Valid=474, Invalid=2827, Unknown=5, NotChecked=0, Total=3306 [2022-11-25 23:45:31,584 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 98 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 881 mSolverCounterSat, 152 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 21.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 1038 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 881 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.6s IncrementalHoareTripleChecker+Time [2022-11-25 23:45:31,584 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [107 Valid, 137 Invalid, 1038 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 881 Invalid, 5 Unknown, 0 Unchecked, 21.6s Time] [2022-11-25 23:45:31,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2022-11-25 23:45:31,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 254. [2022-11-25 23:45:31,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 254 states, 139 states have (on average 1.1726618705035972) internal successors, (163), 142 states have internal predecessors, (163), 95 states have call successors, (95), 19 states have call predecessors, (95), 19 states have return successors, (94), 92 states have call predecessors, (94), 94 states have call successors, (94) [2022-11-25 23:45:31,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 352 transitions. [2022-11-25 23:45:31,748 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 352 transitions. Word has length 90 [2022-11-25 23:45:31,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:45:31,749 INFO L495 AbstractCegarLoop]: Abstraction has 254 states and 352 transitions. [2022-11-25 23:45:31,749 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 18 states have internal predecessors, (39), 11 states have call successors, (33), 3 states have call predecessors, (33), 3 states have return successors, (32), 11 states have call predecessors, (32), 10 states have call successors, (32) [2022-11-25 23:45:31,749 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 352 transitions. [2022-11-25 23:45:31,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2022-11-25 23:45:31,751 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:45:31,751 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 6, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:45:31,757 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-25 23:45:31,957 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:45:31,957 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:45:31,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:45:31,957 INFO L85 PathProgramCache]: Analyzing trace with hash 2106799636, now seen corresponding path program 2 times [2022-11-25 23:45:31,958 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:45:31,958 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1001242280] [2022-11-25 23:45:31,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:45:31,958 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:45:31,969 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:45:31,969 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1513315339] [2022-11-25 23:45:31,969 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:45:31,969 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:45:31,970 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:45:31,971 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:45:31,990 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-25 23:45:32,037 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-25 23:45:32,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:45:32,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-25 23:45:32,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:45:32,070 INFO L134 CoverageAnalysis]: Checked inductivity of 343 backedges. 43 proven. 0 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2022-11-25 23:45:32,070 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 23:45:32,070 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:45:32,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1001242280] [2022-11-25 23:45:32,070 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:45:32,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1513315339] [2022-11-25 23:45:32,070 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1513315339] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:45:32,070 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:45:32,070 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-25 23:45:32,071 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1855425784] [2022-11-25 23:45:32,071 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:45:32,071 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-25 23:45:32,071 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:45:32,072 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-25 23:45:32,072 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-25 23:45:32,072 INFO L87 Difference]: Start difference. First operand 254 states and 352 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) [2022-11-25 23:45:32,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:45:32,341 INFO L93 Difference]: Finished difference Result 353 states and 485 transitions. [2022-11-25 23:45:32,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-25 23:45:32,344 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) Word has length 99 [2022-11-25 23:45:32,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:45:32,345 INFO L225 Difference]: With dead ends: 353 [2022-11-25 23:45:32,345 INFO L226 Difference]: Without dead ends: 229 [2022-11-25 23:45:32,347 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-11-25 23:45:32,347 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 7 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:45:32,348 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 128 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:45:32,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2022-11-25 23:45:32,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 197. [2022-11-25 23:45:32,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 197 states, 110 states have (on average 1.1181818181818182) internal successors, (123), 113 states have internal predecessors, (123), 67 states have call successors, (67), 19 states have call predecessors, (67), 19 states have return successors, (66), 64 states have call predecessors, (66), 66 states have call successors, (66) [2022-11-25 23:45:32,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 256 transitions. [2022-11-25 23:45:32,463 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 256 transitions. Word has length 99 [2022-11-25 23:45:32,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:45:32,464 INFO L495 AbstractCegarLoop]: Abstraction has 197 states and 256 transitions. [2022-11-25 23:45:32,464 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) [2022-11-25 23:45:32,464 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 256 transitions. [2022-11-25 23:45:32,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2022-11-25 23:45:32,465 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:45:32,466 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:45:32,471 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-25 23:45:32,666 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-25 23:45:32,666 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:45:32,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:45:32,667 INFO L85 PathProgramCache]: Analyzing trace with hash -425141716, now seen corresponding path program 2 times [2022-11-25 23:45:32,667 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:45:32,667 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1185842598] [2022-11-25 23:45:32,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:45:32,667 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:45:32,678 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:45:32,679 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [372920461] [2022-11-25 23:45:32,679 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:45:32,679 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:45:32,679 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:45:32,680 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:45:32,702 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-25 23:45:32,943 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-25 23:45:32,943 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:45:32,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-25 23:45:32,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:45:33,569 INFO L134 CoverageAnalysis]: Checked inductivity of 454 backedges. 33 proven. 32 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2022-11-25 23:45:33,569 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:45:35,292 INFO L134 CoverageAnalysis]: Checked inductivity of 454 backedges. 28 proven. 32 refuted. 0 times theorem prover too weak. 394 trivial. 0 not checked. [2022-11-25 23:45:35,292 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:45:35,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1185842598] [2022-11-25 23:45:35,292 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:45:35,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [372920461] [2022-11-25 23:45:35,292 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [372920461] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:45:35,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [211275213] [2022-11-25 23:45:35,295 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-25 23:45:35,295 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:45:35,295 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:45:35,295 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:45:35,295 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:45:37,732 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-25 23:45:37,775 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-25 23:45:37,788 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:46:18,479 WARN L233 SmtUtils]: Spent 36.84s on a formula simplification. DAG size of input: 180 DAG size of output: 147 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:46:34,855 WARN L233 SmtUtils]: Spent 12.12s on a formula simplification that was a NOOP. DAG size: 75 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:46:57,865 WARN L233 SmtUtils]: Spent 21.28s on a formula simplification. DAG size of input: 77 DAG size of output: 75 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:46:58,015 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9659#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:46:58,015 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:46:58,015 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:46:58,015 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 21 [2022-11-25 23:46:58,016 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1029079832] [2022-11-25 23:46:58,018 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 23:46:58,020 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-25 23:46:58,022 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:46:58,023 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-25 23:46:58,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=1354, Unknown=0, NotChecked=0, Total=1560 [2022-11-25 23:46:58,024 INFO L87 Difference]: Start difference. First operand 197 states and 256 transitions. Second operand has 21 states, 20 states have (on average 1.9) internal successors, (38), 19 states have internal predecessors, (38), 11 states have call successors, (38), 3 states have call predecessors, (38), 2 states have return successors, (36), 11 states have call predecessors, (36), 11 states have call successors, (36) [2022-11-25 23:47:23,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:47:23,649 INFO L93 Difference]: Finished difference Result 315 states and 440 transitions. [2022-11-25 23:47:23,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-25 23:47:23,650 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.9) internal successors, (38), 19 states have internal predecessors, (38), 11 states have call successors, (38), 3 states have call predecessors, (38), 2 states have return successors, (36), 11 states have call predecessors, (36), 11 states have call successors, (36) Word has length 107 [2022-11-25 23:47:23,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:47:23,655 INFO L225 Difference]: With dead ends: 315 [2022-11-25 23:47:23,655 INFO L226 Difference]: Without dead ends: 313 [2022-11-25 23:47:23,657 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 265 SyntacticMatches, 16 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1758 ImplicationChecksByTransitivity, 96.3s TimeCoverageRelationStatistics Valid=651, Invalid=3771, Unknown=0, NotChecked=0, Total=4422 [2022-11-25 23:47:23,657 INFO L413 NwaCegarLoop]: 85 mSDtfsCounter, 102 mSDsluCounter, 354 mSDsCounter, 0 mSdLazyCounter, 1121 mSolverCounterSat, 213 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 439 SdHoareTripleChecker+Invalid, 1334 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 213 IncrementalHoareTripleChecker+Valid, 1121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.8s IncrementalHoareTripleChecker+Time [2022-11-25 23:47:23,658 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [106 Valid, 439 Invalid, 1334 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [213 Valid, 1121 Invalid, 0 Unknown, 0 Unchecked, 9.8s Time] [2022-11-25 23:47:23,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 313 states. [2022-11-25 23:47:23,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 313 to 278. [2022-11-25 23:47:23,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 148 states have (on average 1.1554054054054055) internal successors, (171), 151 states have internal predecessors, (171), 107 states have call successors, (107), 22 states have call predecessors, (107), 22 states have return successors, (106), 104 states have call predecessors, (106), 106 states have call successors, (106) [2022-11-25 23:47:23,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 384 transitions. [2022-11-25 23:47:23,899 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 384 transitions. Word has length 107 [2022-11-25 23:47:23,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:47:23,899 INFO L495 AbstractCegarLoop]: Abstraction has 278 states and 384 transitions. [2022-11-25 23:47:23,899 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 1.9) internal successors, (38), 19 states have internal predecessors, (38), 11 states have call successors, (38), 3 states have call predecessors, (38), 2 states have return successors, (36), 11 states have call predecessors, (36), 11 states have call successors, (36) [2022-11-25 23:47:23,900 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 384 transitions. [2022-11-25 23:47:23,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2022-11-25 23:47:23,901 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:47:23,901 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:47:23,908 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-25 23:47:24,108 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-25 23:47:24,108 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:47:24,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:47:24,109 INFO L85 PathProgramCache]: Analyzing trace with hash -743497349, now seen corresponding path program 3 times [2022-11-25 23:47:24,109 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:47:24,109 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1690653894] [2022-11-25 23:47:24,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:47:24,109 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:47:24,119 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:47:24,119 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1950195124] [2022-11-25 23:47:24,119 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:47:24,119 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:47:24,119 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:47:24,120 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:47:24,142 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-25 23:47:24,220 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:47:24,220 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:47:24,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 59 conjunts are in the unsatisfiable core [2022-11-25 23:47:24,224 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:47:25,025 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 30 proven. 40 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2022-11-25 23:47:25,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:47:27,098 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 36 proven. 29 refuted. 0 times theorem prover too weak. 394 trivial. 0 not checked. [2022-11-25 23:47:27,098 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:47:27,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1690653894] [2022-11-25 23:47:27,099 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:47:27,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1950195124] [2022-11-25 23:47:27,099 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1950195124] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:47:27,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1371894889] [2022-11-25 23:47:27,101 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-25 23:47:27,101 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:47:27,101 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:47:27,101 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:47:27,102 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:47:29,584 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-25 23:47:29,629 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-25 23:47:29,641 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:48:15,980 WARN L233 SmtUtils]: Spent 42.74s on a formula simplification. DAG size of input: 180 DAG size of output: 147 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:48:36,724 WARN L233 SmtUtils]: Spent 15.56s on a formula simplification that was a NOOP. DAG size: 75 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:48:55,321 WARN L233 SmtUtils]: Spent 17.59s on a formula simplification. DAG size of input: 77 DAG size of output: 75 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:48:55,937 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11354#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:48:55,937 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:48:55,938 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:48:55,938 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 24 [2022-11-25 23:48:55,938 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271974127] [2022-11-25 23:48:55,938 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 23:48:55,939 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-25 23:48:55,939 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:48:55,940 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-25 23:48:55,941 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=1576, Unknown=0, NotChecked=0, Total=1806 [2022-11-25 23:48:55,941 INFO L87 Difference]: Start difference. First operand 278 states and 384 transitions. Second operand has 24 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 21 states have internal predecessors, (44), 12 states have call successors, (39), 3 states have call predecessors, (39), 2 states have return successors, (38), 12 states have call predecessors, (38), 12 states have call successors, (38) [2022-11-25 23:49:13,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:49:13,323 INFO L93 Difference]: Finished difference Result 434 states and 623 transitions. [2022-11-25 23:49:13,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-25 23:49:13,323 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 21 states have internal predecessors, (44), 12 states have call successors, (39), 3 states have call predecessors, (39), 2 states have return successors, (38), 12 states have call predecessors, (38), 12 states have call successors, (38) Word has length 110 [2022-11-25 23:49:13,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:49:13,326 INFO L225 Difference]: With dead ends: 434 [2022-11-25 23:49:13,326 INFO L226 Difference]: Without dead ends: 432 [2022-11-25 23:49:13,327 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 271 SyntacticMatches, 16 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1874 ImplicationChecksByTransitivity, 96.8s TimeCoverageRelationStatistics Valid=551, Invalid=3481, Unknown=0, NotChecked=0, Total=4032 [2022-11-25 23:49:13,328 INFO L413 NwaCegarLoop]: 61 mSDtfsCounter, 90 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 943 mSolverCounterSat, 206 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 329 SdHoareTripleChecker+Invalid, 1149 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 206 IncrementalHoareTripleChecker+Valid, 943 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:49:13,328 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [94 Valid, 329 Invalid, 1149 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [206 Valid, 943 Invalid, 0 Unknown, 0 Unchecked, 8.0s Time] [2022-11-25 23:49:13,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 432 states. [2022-11-25 23:49:13,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 432 to 406. [2022-11-25 23:49:13,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 406 states, 211 states have (on average 1.1753554502369667) internal successors, (248), 214 states have internal predecessors, (248), 167 states have call successors, (167), 27 states have call predecessors, (167), 27 states have return successors, (166), 164 states have call predecessors, (166), 166 states have call successors, (166) [2022-11-25 23:49:13,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 406 states to 406 states and 581 transitions. [2022-11-25 23:49:13,701 INFO L78 Accepts]: Start accepts. Automaton has 406 states and 581 transitions. Word has length 110 [2022-11-25 23:49:13,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:49:13,701 INFO L495 AbstractCegarLoop]: Abstraction has 406 states and 581 transitions. [2022-11-25 23:49:13,702 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 21 states have internal predecessors, (44), 12 states have call successors, (39), 3 states have call predecessors, (39), 2 states have return successors, (38), 12 states have call predecessors, (38), 12 states have call successors, (38) [2022-11-25 23:49:13,702 INFO L276 IsEmpty]: Start isEmpty. Operand 406 states and 581 transitions. [2022-11-25 23:49:13,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2022-11-25 23:49:13,704 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:49:13,704 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:49:13,710 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-11-25 23:49:13,910 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-25 23:49:13,911 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:49:13,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:49:13,911 INFO L85 PathProgramCache]: Analyzing trace with hash 1538893617, now seen corresponding path program 3 times [2022-11-25 23:49:13,911 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:49:13,911 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [192179235] [2022-11-25 23:49:13,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:49:13,911 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:49:13,921 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:49:13,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1312078636] [2022-11-25 23:49:13,921 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:49:13,921 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:49:13,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:49:13,923 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:49:13,933 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-25 23:49:14,015 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:49:14,015 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:49:14,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 66 conjunts are in the unsatisfiable core [2022-11-25 23:49:14,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:49:15,037 INFO L134 CoverageAnalysis]: Checked inductivity of 585 backedges. 34 proven. 46 refuted. 0 times theorem prover too weak. 505 trivial. 0 not checked. [2022-11-25 23:49:15,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:49:18,537 INFO L134 CoverageAnalysis]: Checked inductivity of 585 backedges. 32 proven. 43 refuted. 0 times theorem prover too weak. 510 trivial. 0 not checked. [2022-11-25 23:49:18,537 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:49:18,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [192179235] [2022-11-25 23:49:18,537 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:49:18,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1312078636] [2022-11-25 23:49:18,538 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1312078636] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:49:18,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [961094074] [2022-11-25 23:49:18,541 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-25 23:49:18,541 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:49:18,541 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:49:18,542 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:49:18,542 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:49:21,468 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 35 for LOIs [2022-11-25 23:49:21,509 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-25 23:49:21,534 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:49:55,987 WARN L233 SmtUtils]: Spent 29.63s on a formula simplification. DAG size of input: 178 DAG size of output: 145 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:50:11,719 WARN L233 SmtUtils]: Spent 9.31s on a formula simplification that was a NOOP. DAG size: 71 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:50:21,792 WARN L233 SmtUtils]: Spent 9.34s on a formula simplification that was a NOOP. DAG size: 73 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:50:33,139 WARN L233 SmtUtils]: Spent 7.69s on a formula simplification. DAG size of input: 176 DAG size of output: 87 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:50:33,191 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13521#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:50:33,191 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:50:33,192 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:50:33,192 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 27 [2022-11-25 23:50:33,192 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [268001074] [2022-11-25 23:50:33,192 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 23:50:33,193 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-25 23:50:33,193 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:50:33,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-25 23:50:33,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=271, Invalid=1985, Unknown=0, NotChecked=0, Total=2256 [2022-11-25 23:50:33,195 INFO L87 Difference]: Start difference. First operand 406 states and 581 transitions. Second operand has 27 states, 24 states have (on average 1.9166666666666667) internal successors, (46), 24 states have internal predecessors, (46), 14 states have call successors, (43), 3 states have call predecessors, (43), 2 states have return successors, (42), 12 states have call predecessors, (42), 12 states have call successors, (42) [2022-11-25 23:50:59,582 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 [] [2022-11-25 23:51:20,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:51:20,533 INFO L93 Difference]: Finished difference Result 508 states and 730 transitions. [2022-11-25 23:51:20,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-11-25 23:51:20,534 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 24 states have (on average 1.9166666666666667) internal successors, (46), 24 states have internal predecessors, (46), 14 states have call successors, (43), 3 states have call predecessors, (43), 2 states have return successors, (42), 12 states have call predecessors, (42), 12 states have call successors, (42) Word has length 121 [2022-11-25 23:51:20,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:51:20,536 INFO L225 Difference]: With dead ends: 508 [2022-11-25 23:51:20,536 INFO L226 Difference]: Without dead ends: 500 [2022-11-25 23:51:20,539 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 296 SyntacticMatches, 19 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3340 ImplicationChecksByTransitivity, 99.6s TimeCoverageRelationStatistics Valid=1022, Invalid=6988, Unknown=0, NotChecked=0, Total=8010 [2022-11-25 23:51:20,540 INFO L413 NwaCegarLoop]: 105 mSDtfsCounter, 183 mSDsluCounter, 455 mSDsCounter, 0 mSdLazyCounter, 1869 mSolverCounterSat, 389 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 21.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 191 SdHoareTripleChecker+Valid, 560 SdHoareTripleChecker+Invalid, 2259 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 389 IncrementalHoareTripleChecker+Valid, 1869 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.8s IncrementalHoareTripleChecker+Time [2022-11-25 23:51:20,540 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [191 Valid, 560 Invalid, 2259 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [389 Valid, 1869 Invalid, 1 Unknown, 0 Unchecked, 21.8s Time] [2022-11-25 23:51:20,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 500 states. [2022-11-25 23:51:21,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 500 to 484. [2022-11-25 23:51:21,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 484 states, 249 states have (on average 1.1686746987951808) internal successors, (291), 253 states have internal predecessors, (291), 203 states have call successors, (203), 31 states have call predecessors, (203), 31 states have return successors, (202), 199 states have call predecessors, (202), 202 states have call successors, (202) [2022-11-25 23:51:21,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 484 states to 484 states and 696 transitions. [2022-11-25 23:51:21,076 INFO L78 Accepts]: Start accepts. Automaton has 484 states and 696 transitions. Word has length 121 [2022-11-25 23:51:21,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:51:21,077 INFO L495 AbstractCegarLoop]: Abstraction has 484 states and 696 transitions. [2022-11-25 23:51:21,077 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 24 states have (on average 1.9166666666666667) internal successors, (46), 24 states have internal predecessors, (46), 14 states have call successors, (43), 3 states have call predecessors, (43), 2 states have return successors, (42), 12 states have call predecessors, (42), 12 states have call successors, (42) [2022-11-25 23:51:21,078 INFO L276 IsEmpty]: Start isEmpty. Operand 484 states and 696 transitions. [2022-11-25 23:51:21,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2022-11-25 23:51:21,080 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:51:21,080 INFO L195 NwaCegarLoop]: trace histogram [20, 19, 19, 6, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:51:21,091 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-25 23:51:21,286 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-25 23:51:21,286 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:51:21,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:51:21,286 INFO L85 PathProgramCache]: Analyzing trace with hash -1914774331, now seen corresponding path program 4 times [2022-11-25 23:51:21,287 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:51:21,287 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [851109597] [2022-11-25 23:51:21,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:51:21,287 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:51:21,296 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-25 23:51:21,296 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [496428159] [2022-11-25 23:51:21,296 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:51:21,296 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:51:21,297 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:51:21,298 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:51:21,299 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d657d12d-26ba-4148-be8c-83713bfd0570/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-25 23:51:21,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:51:21,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 342 conjuncts, 74 conjunts are in the unsatisfiable core [2022-11-25 23:51:21,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:51:24,047 INFO L134 CoverageAnalysis]: Checked inductivity of 815 backedges. 93 proven. 67 refuted. 0 times theorem prover too weak. 655 trivial. 0 not checked. [2022-11-25 23:51:24,047 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:52:04,512 WARN L233 SmtUtils]: Spent 5.53s on a formula simplification that was a NOOP. DAG size: 46 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:52:08,928 INFO L134 CoverageAnalysis]: Checked inductivity of 815 backedges. 91 proven. 64 refuted. 0 times theorem prover too weak. 660 trivial. 0 not checked. [2022-11-25 23:52:08,928 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:52:08,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [851109597] [2022-11-25 23:52:08,929 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-25 23:52:08,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [496428159] [2022-11-25 23:52:08,929 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [496428159] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:52:08,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [593607735] [2022-11-25 23:52:08,931 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-25 23:52:08,931 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:52:08,932 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:52:08,932 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:52:08,932 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:52:11,205 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-25 23:52:11,255 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-25 23:52:11,269 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:53:08,410 WARN L233 SmtUtils]: Spent 45.28s on a formula simplification. DAG size of input: 180 DAG size of output: 147 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:53:34,981 WARN L233 SmtUtils]: Spent 8.16s on a formula simplification that was a NOOP. DAG size: 75 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:53:58,296 WARN L233 SmtUtils]: Spent 22.30s on a formula simplification. DAG size of input: 77 DAG size of output: 75 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:54:09,380 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16080#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2022-11-25 23:54:09,380 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:54:09,380 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-25 23:54:09,380 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 15] total 30 [2022-11-25 23:54:09,380 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635013963] [2022-11-25 23:54:09,380 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-25 23:54:09,381 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-25 23:54:09,381 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:54:09,382 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-25 23:54:09,382 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=310, Invalid=2038, Unknown=4, NotChecked=0, Total=2352 [2022-11-25 23:54:09,383 INFO L87 Difference]: Start difference. First operand 484 states and 696 transitions. Second operand has 30 states, 28 states have (on average 1.8928571428571428) internal successors, (53), 27 states have internal predecessors, (53), 15 states have call successors, (49), 3 states have call predecessors, (49), 3 states have return successors, (48), 15 states have call predecessors, (48), 14 states have call successors, (48) [2022-11-25 23:54:15,578 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.31s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:54:18,940 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.01s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:54:22,626 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:54:25,167 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:54:40,464 WARN L233 SmtUtils]: Spent 13.95s on a formula simplification that was a NOOP. DAG size: 139 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-25 23:54:48,078 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-25 23:54:50,110 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers []