./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound20.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version b5237d83 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound20.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 9e9911e775b3214ba13077b05d83e9364947724e9afa3bb89f51b07ee325bd90 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-b5237d8 [2022-11-22 02:46:30,766 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-22 02:46:30,769 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-22 02:46:30,809 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-22 02:46:30,809 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-22 02:46:30,813 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-22 02:46:30,815 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-22 02:46:30,818 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-22 02:46:30,820 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-22 02:46:30,825 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-22 02:46:30,827 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-22 02:46:30,829 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-22 02:46:30,830 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-22 02:46:30,832 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-22 02:46:30,834 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-22 02:46:30,836 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-22 02:46:30,838 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-22 02:46:30,839 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-22 02:46:30,840 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-22 02:46:30,847 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-22 02:46:30,849 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-22 02:46:30,851 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-22 02:46:30,853 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-22 02:46:30,854 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-22 02:46:30,864 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-22 02:46:30,865 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-22 02:46:30,866 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-22 02:46:30,868 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-22 02:46:30,868 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-22 02:46:30,870 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-22 02:46:30,870 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-22 02:46:30,871 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-22 02:46:30,873 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-22 02:46:30,874 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-22 02:46:30,877 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-22 02:46:30,877 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-22 02:46:30,878 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-22 02:46:30,879 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-22 02:46:30,879 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-22 02:46:30,881 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-22 02:46:30,882 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-22 02:46:30,883 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-22 02:46:30,923 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-22 02:46:30,923 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-22 02:46:30,924 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-22 02:46:30,924 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-22 02:46:30,925 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-22 02:46:30,925 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-22 02:46:30,926 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-22 02:46:30,926 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-22 02:46:30,926 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-22 02:46:30,927 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-22 02:46:30,928 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-22 02:46:30,928 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-22 02:46:30,928 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-22 02:46:30,929 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-22 02:46:30,929 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-22 02:46:30,929 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-22 02:46:30,929 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-22 02:46:30,930 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-22 02:46:30,930 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-22 02:46:30,931 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-22 02:46:30,931 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-22 02:46:30,931 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-22 02:46:30,931 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-22 02:46:30,932 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-22 02:46:30,932 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-22 02:46:30,932 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-22 02:46:30,932 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-22 02:46:30,933 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-22 02:46:30,933 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-22 02:46:30,933 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-22 02:46:30,933 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-22 02:46:30,934 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-22 02:46:30,934 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 02:46:30,934 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-22 02:46:30,935 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-22 02:46:30,935 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-22 02:46:30,935 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-22 02:46:30,935 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-22 02:46:30,936 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-22 02:46:30,936 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-22 02:46:30,936 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-22 02:46:30,936 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_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9e9911e775b3214ba13077b05d83e9364947724e9afa3bb89f51b07ee325bd90 [2022-11-22 02:46:31,281 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-22 02:46:31,314 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-22 02:46:31,319 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-22 02:46:31,321 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-22 02:46:31,321 INFO L275 PluginConnector]: CDTParser initialized [2022-11-22 02:46:31,323 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound20.c [2022-11-22 02:46:34,645 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-22 02:46:34,827 INFO L351 CDTParser]: Found 1 translation units. [2022-11-22 02:46:34,828 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound20.c [2022-11-22 02:46:34,834 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/data/31ec02188/7e8f32e22d7a4c93b02bf331d6c6835e/FLAG70c91bc2e [2022-11-22 02:46:34,849 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/data/31ec02188/7e8f32e22d7a4c93b02bf331d6c6835e [2022-11-22 02:46:34,852 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-22 02:46:34,854 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-22 02:46:34,855 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-22 02:46:34,855 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-22 02:46:34,859 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-22 02:46:34,860 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 02:46:34" (1/1) ... [2022-11-22 02:46:34,861 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@429fc1f1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:46:34, skipping insertion in model container [2022-11-22 02:46:34,861 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 02:46:34" (1/1) ... [2022-11-22 02:46:34,869 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-22 02:46:34,885 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-22 02:46:35,113 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_6b693ae3-e3d6-45f1-a068-11f28eca31f2/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound20.c[490,503] [2022-11-22 02:46:35,138 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 02:46:35,149 INFO L203 MainTranslator]: Completed pre-run [2022-11-22 02:46:35,163 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_6b693ae3-e3d6-45f1-a068-11f28eca31f2/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound20.c[490,503] [2022-11-22 02:46:35,175 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 02:46:35,189 INFO L208 MainTranslator]: Completed translation [2022-11-22 02:46:35,190 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:46:35 WrapperNode [2022-11-22 02:46:35,190 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-22 02:46:35,191 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-22 02:46:35,192 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-22 02:46:35,192 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-22 02:46:35,200 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:46:35" (1/1) ... [2022-11-22 02:46:35,208 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:46:35" (1/1) ... [2022-11-22 02:46:35,229 INFO L138 Inliner]: procedures = 14, calls = 17, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 84 [2022-11-22 02:46:35,230 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-22 02:46:35,231 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-22 02:46:35,231 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-22 02:46:35,231 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-22 02:46:35,241 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:46:35" (1/1) ... [2022-11-22 02:46:35,242 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:46:35" (1/1) ... [2022-11-22 02:46:35,243 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:46:35" (1/1) ... [2022-11-22 02:46:35,244 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:46:35" (1/1) ... [2022-11-22 02:46:35,247 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:46:35" (1/1) ... [2022-11-22 02:46:35,252 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:46:35" (1/1) ... [2022-11-22 02:46:35,253 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:46:35" (1/1) ... [2022-11-22 02:46:35,254 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:46:35" (1/1) ... [2022-11-22 02:46:35,256 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-22 02:46:35,257 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-22 02:46:35,257 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-22 02:46:35,257 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-22 02:46:35,258 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:46:35" (1/1) ... [2022-11-22 02:46:35,265 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 02:46:35,279 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:46:35,293 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-22 02:46:35,323 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-22 02:46:35,352 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-22 02:46:35,352 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-22 02:46:35,352 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-22 02:46:35,353 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-22 02:46:35,353 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-22 02:46:35,353 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-22 02:46:35,354 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-22 02:46:35,354 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-22 02:46:35,434 INFO L235 CfgBuilder]: Building ICFG [2022-11-22 02:46:35,437 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-22 02:46:35,754 INFO L276 CfgBuilder]: Performing block encoding [2022-11-22 02:46:35,815 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-22 02:46:35,816 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-22 02:46:35,824 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 02:46:35 BoogieIcfgContainer [2022-11-22 02:46:35,825 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-22 02:46:35,844 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-22 02:46:35,844 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-22 02:46:35,848 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-22 02:46:35,849 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 02:46:34" (1/3) ... [2022-11-22 02:46:35,850 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@662f46fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 02:46:35, skipping insertion in model container [2022-11-22 02:46:35,850 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:46:35" (2/3) ... [2022-11-22 02:46:35,851 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@662f46fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 02:46:35, skipping insertion in model container [2022-11-22 02:46:35,851 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 02:46:35" (3/3) ... [2022-11-22 02:46:35,853 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd2-ll_unwindbound20.c [2022-11-22 02:46:35,885 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-22 02:46:35,885 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-22 02:46:35,942 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-22 02:46:35,949 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;@2ca08fc8, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-22 02:46:35,950 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-22 02:46:35,953 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 17 states have internal predecessors, (23), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-22 02:46:35,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-22 02:46:35,961 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:46:35,962 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:46:35,962 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:46:35,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:46:35,969 INFO L85 PathProgramCache]: Analyzing trace with hash 2133247598, now seen corresponding path program 1 times [2022-11-22 02:46:35,977 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:46:35,978 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1598846021] [2022-11-22 02:46:35,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:46:35,978 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:46:36,114 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:46:36,115 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [694408612] [2022-11-22 02:46:36,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:46:36,116 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:46:36,116 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:46:36,120 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:46:36,127 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-22 02:46:36,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:46:36,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-22 02:46:36,255 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:46:36,286 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-22 02:46:36,287 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 02:46:36,287 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:46:36,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1598846021] [2022-11-22 02:46:36,288 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:46:36,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [694408612] [2022-11-22 02:46:36,289 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [694408612] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:46:36,289 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:46:36,290 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-22 02:46:36,292 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1695431158] [2022-11-22 02:46:36,293 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:46:36,298 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-22 02:46:36,298 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:46:36,326 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-22 02:46:36,327 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-22 02:46:36,329 INFO L87 Difference]: Start difference. First operand has 29 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 17 states have internal predecessors, (23), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-22 02:46:36,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:46:36,360 INFO L93 Difference]: Finished difference Result 50 states and 81 transitions. [2022-11-22 02:46:36,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-22 02:46:36,363 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 19 [2022-11-22 02:46:36,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:46:36,371 INFO L225 Difference]: With dead ends: 50 [2022-11-22 02:46:36,372 INFO L226 Difference]: Without dead ends: 27 [2022-11-22 02:46:36,375 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-22 02:46:36,379 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:46:36,380 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 37 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:46:36,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-11-22 02:46:36,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-11-22 02:46:36,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 16 states have internal predecessors, (19), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-22 02:46:36,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 38 transitions. [2022-11-22 02:46:36,420 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 38 transitions. Word has length 19 [2022-11-22 02:46:36,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:46:36,422 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 38 transitions. [2022-11-22 02:46:36,422 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-22 02:46:36,422 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 38 transitions. [2022-11-22 02:46:36,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-22 02:46:36,426 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:46:36,427 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:46:36,432 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-22 02:46:36,631 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-22 02:46:36,632 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:46:36,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:46:36,634 INFO L85 PathProgramCache]: Analyzing trace with hash 635683218, now seen corresponding path program 1 times [2022-11-22 02:46:36,634 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:46:36,635 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [448248950] [2022-11-22 02:46:36,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:46:36,635 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:46:36,678 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:46:36,679 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [541197416] [2022-11-22 02:46:36,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:46:36,680 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:46:36,680 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:46:36,687 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:46:36,690 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-22 02:46:36,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:46:36,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-22 02:46:36,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:46:36,894 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-22 02:46:36,894 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 02:46:36,894 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:46:36,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [448248950] [2022-11-22 02:46:36,895 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:46:36,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [541197416] [2022-11-22 02:46:36,895 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [541197416] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:46:36,895 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:46:36,896 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-22 02:46:36,896 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [263440809] [2022-11-22 02:46:36,896 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:46:36,897 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-22 02:46:36,897 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:46:36,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-22 02:46:36,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-22 02:46:36,899 INFO L87 Difference]: Start difference. First operand 27 states and 38 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-22 02:46:36,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:46:36,928 INFO L93 Difference]: Finished difference Result 37 states and 49 transitions. [2022-11-22 02:46:36,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-22 02:46:36,929 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 20 [2022-11-22 02:46:36,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:46:36,930 INFO L225 Difference]: With dead ends: 37 [2022-11-22 02:46:36,931 INFO L226 Difference]: Without dead ends: 29 [2022-11-22 02:46:36,931 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-22 02:46:36,933 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 0 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:46:36,933 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 91 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:46:36,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-11-22 02:46:36,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-11-22 02:46:36,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 16 states have (on average 1.3125) internal successors, (21), 17 states have internal predecessors, (21), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-22 02:46:36,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 40 transitions. [2022-11-22 02:46:36,943 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 40 transitions. Word has length 20 [2022-11-22 02:46:36,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:46:36,944 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 40 transitions. [2022-11-22 02:46:36,944 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-22 02:46:36,948 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 40 transitions. [2022-11-22 02:46:36,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-22 02:46:36,949 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:46:36,949 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:46:36,964 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-11-22 02:46:37,156 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:46:37,157 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:46:37,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:46:37,158 INFO L85 PathProgramCache]: Analyzing trace with hash -1775243410, now seen corresponding path program 1 times [2022-11-22 02:46:37,158 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:46:37,159 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1654886846] [2022-11-22 02:46:37,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:46:37,159 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:46:37,177 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:46:37,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [683043676] [2022-11-22 02:46:37,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:46:37,178 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:46:37,178 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:46:37,180 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:46:37,184 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-22 02:46:37,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:46:37,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-22 02:46:37,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:46:37,373 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-22 02:46:37,373 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:46:37,484 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-22 02:46:37,484 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:46:37,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1654886846] [2022-11-22 02:46:37,485 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:46:37,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [683043676] [2022-11-22 02:46:37,485 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [683043676] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:46:37,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1330407109] [2022-11-22 02:46:37,514 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-22 02:46:37,514 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:46:37,519 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:46:37,525 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:46:37,525 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:46:38,744 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-22 02:46:38,794 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:46:40,900 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1330407109] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:46:40,900 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:46:40,900 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [5, 5] total 15 [2022-11-22 02:46:40,901 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827580799] [2022-11-22 02:46:40,901 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:46:40,903 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-22 02:46:40,903 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:46:40,904 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-22 02:46:40,904 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=148, Unknown=0, NotChecked=0, Total=210 [2022-11-22 02:46:40,904 INFO L87 Difference]: Start difference. First operand 29 states and 40 transitions. Second operand has 12 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-22 02:46:41,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:46:41,742 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2022-11-22 02:46:41,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-22 02:46:41,743 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 21 [2022-11-22 02:46:41,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:46:41,744 INFO L225 Difference]: With dead ends: 38 [2022-11-22 02:46:41,745 INFO L226 Difference]: Without dead ends: 30 [2022-11-22 02:46:41,745 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=62, Invalid=148, Unknown=0, NotChecked=0, Total=210 [2022-11-22 02:46:41,747 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 2 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-22 02:46:41,747 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 113 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-22 02:46:41,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-11-22 02:46:41,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-11-22 02:46:41,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 18 states have internal predecessors, (22), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-22 02:46:41,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 41 transitions. [2022-11-22 02:46:41,771 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 41 transitions. Word has length 21 [2022-11-22 02:46:41,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:46:41,773 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 41 transitions. [2022-11-22 02:46:41,774 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-22 02:46:41,774 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 41 transitions. [2022-11-22 02:46:41,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-22 02:46:41,775 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:46:41,776 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:46:41,789 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-22 02:46:41,983 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:46:41,983 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:46:41,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:46:41,984 INFO L85 PathProgramCache]: Analyzing trace with hash -963684835, now seen corresponding path program 1 times [2022-11-22 02:46:41,984 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:46:41,984 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1791384441] [2022-11-22 02:46:41,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:46:41,985 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:46:41,997 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:46:41,998 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1110235019] [2022-11-22 02:46:41,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:46:41,998 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:46:41,998 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:46:42,000 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:46:42,004 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-22 02:46:42,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:46:42,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-22 02:46:42,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:46:42,172 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-22 02:46:42,172 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:46:42,262 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-22 02:46:42,262 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:46:42,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1791384441] [2022-11-22 02:46:42,268 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:46:42,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1110235019] [2022-11-22 02:46:42,270 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1110235019] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-22 02:46:42,271 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-22 02:46:42,271 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 11 [2022-11-22 02:46:42,272 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1065569200] [2022-11-22 02:46:42,272 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:46:42,273 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 02:46:42,273 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:46:42,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 02:46:42,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2022-11-22 02:46:42,284 INFO L87 Difference]: Start difference. First operand 30 states and 41 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-22 02:46:42,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:46:42,364 INFO L93 Difference]: Finished difference Result 36 states and 46 transitions. [2022-11-22 02:46:42,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 02:46:42,365 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 23 [2022-11-22 02:46:42,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:46:42,367 INFO L225 Difference]: With dead ends: 36 [2022-11-22 02:46:42,367 INFO L226 Difference]: Without dead ends: 34 [2022-11-22 02:46:42,367 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-11-22 02:46:42,369 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 8 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:46:42,370 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 95 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:46:42,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-11-22 02:46:42,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2022-11-22 02:46:42,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 20 states have (on average 1.25) internal successors, (25), 21 states have internal predecessors, (25), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-22 02:46:42,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 44 transitions. [2022-11-22 02:46:42,404 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 44 transitions. Word has length 23 [2022-11-22 02:46:42,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:46:42,405 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 44 transitions. [2022-11-22 02:46:42,405 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-22 02:46:42,405 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 44 transitions. [2022-11-22 02:46:42,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-22 02:46:42,408 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:46:42,408 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:46:42,422 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-22 02:46:42,616 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:46:42,617 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:46:42,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:46:42,618 INFO L85 PathProgramCache]: Analyzing trace with hash -748532437, now seen corresponding path program 1 times [2022-11-22 02:46:42,618 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:46:42,618 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [369494839] [2022-11-22 02:46:42,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:46:42,619 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:46:42,637 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:46:42,641 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1105430767] [2022-11-22 02:46:42,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:46:42,642 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:46:42,642 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:46:42,643 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:46:42,651 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-22 02:46:42,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:46:42,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-22 02:46:42,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:46:42,749 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-22 02:46:42,749 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 02:46:42,749 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:46:42,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [369494839] [2022-11-22 02:46:42,750 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:46:42,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1105430767] [2022-11-22 02:46:42,750 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1105430767] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:46:42,750 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:46:42,750 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-22 02:46:42,751 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083319890] [2022-11-22 02:46:42,751 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:46:42,751 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 02:46:42,751 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:46:42,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 02:46:42,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-22 02:46:42,752 INFO L87 Difference]: Start difference. First operand 34 states and 44 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-22 02:46:42,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:46:42,789 INFO L93 Difference]: Finished difference Result 59 states and 77 transitions. [2022-11-22 02:46:42,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-22 02:46:42,809 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 26 [2022-11-22 02:46:42,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:46:42,812 INFO L225 Difference]: With dead ends: 59 [2022-11-22 02:46:42,812 INFO L226 Difference]: Without dead ends: 36 [2022-11-22 02:46:42,813 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-22 02:46:42,819 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 2 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:46:42,819 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 91 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:46:42,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-11-22 02:46:42,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2022-11-22 02:46:42,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 23 states have internal predecessors, (27), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-22 02:46:42,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 46 transitions. [2022-11-22 02:46:42,832 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 46 transitions. Word has length 26 [2022-11-22 02:46:42,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:46:42,832 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 46 transitions. [2022-11-22 02:46:42,833 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-22 02:46:42,833 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 46 transitions. [2022-11-22 02:46:42,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-22 02:46:42,834 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:46:42,834 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:46:42,844 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-11-22 02:46:43,040 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:46:43,041 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:46:43,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:46:43,041 INFO L85 PathProgramCache]: Analyzing trace with hash 47389219, now seen corresponding path program 1 times [2022-11-22 02:46:43,041 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:46:43,041 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1960267655] [2022-11-22 02:46:43,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:46:43,042 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:46:43,053 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:46:43,053 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1138004061] [2022-11-22 02:46:43,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:46:43,054 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:46:43,054 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:46:43,055 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:46:43,075 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-22 02:46:43,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:46:43,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-22 02:46:43,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:46:43,410 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-22 02:46:43,410 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:46:43,606 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-22 02:46:43,607 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:46:43,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1960267655] [2022-11-22 02:46:43,607 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:46:43,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1138004061] [2022-11-22 02:46:43,607 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1138004061] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-22 02:46:43,608 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-22 02:46:43,608 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [11] total 13 [2022-11-22 02:46:43,608 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1500131724] [2022-11-22 02:46:43,608 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:46:43,608 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 02:46:43,609 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:46:43,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 02:46:43,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2022-11-22 02:46:43,610 INFO L87 Difference]: Start difference. First operand 36 states and 46 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-22 02:46:43,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:46:43,719 INFO L93 Difference]: Finished difference Result 50 states and 65 transitions. [2022-11-22 02:46:43,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 02:46:43,720 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 28 [2022-11-22 02:46:43,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:46:43,723 INFO L225 Difference]: With dead ends: 50 [2022-11-22 02:46:43,723 INFO L226 Difference]: Without dead ends: 48 [2022-11-22 02:46:43,723 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2022-11-22 02:46:43,726 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 7 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:46:43,728 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 121 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:46:43,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-11-22 02:46:43,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2022-11-22 02:46:43,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 28 states have (on average 1.25) internal successors, (35), 29 states have internal predecessors, (35), 14 states have call successors, (14), 4 states have call predecessors, (14), 4 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-11-22 02:46:43,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 62 transitions. [2022-11-22 02:46:43,757 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 62 transitions. Word has length 28 [2022-11-22 02:46:43,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:46:43,757 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 62 transitions. [2022-11-22 02:46:43,758 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-11-22 02:46:43,758 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 62 transitions. [2022-11-22 02:46:43,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-22 02:46:43,759 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:46:43,759 INFO L195 NwaCegarLoop]: trace histogram [4, 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] [2022-11-22 02:46:43,772 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-22 02:46:43,966 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:46:43,967 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:46:43,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:46:43,967 INFO L85 PathProgramCache]: Analyzing trace with hash 2024014237, now seen corresponding path program 1 times [2022-11-22 02:46:43,967 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:46:43,967 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1065977180] [2022-11-22 02:46:43,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:46:43,968 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:46:43,980 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:46:43,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [391286691] [2022-11-22 02:46:43,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:46:43,981 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:46:43,981 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:46:43,982 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:46:44,019 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-22 02:46:44,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:46:44,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-22 02:46:44,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:46:44,274 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-22 02:46:44,274 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:46:44,436 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-22 02:46:44,437 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:46:44,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1065977180] [2022-11-22 02:46:44,437 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:46:44,438 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [391286691] [2022-11-22 02:46:44,438 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [391286691] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-22 02:46:44,438 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-22 02:46:44,438 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 12 [2022-11-22 02:46:44,438 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [444710470] [2022-11-22 02:46:44,439 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:46:44,439 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 02:46:44,439 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:46:44,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 02:46:44,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-11-22 02:46:44,440 INFO L87 Difference]: Start difference. First operand 47 states and 62 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-22 02:46:44,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:46:44,567 INFO L93 Difference]: Finished difference Result 54 states and 68 transitions. [2022-11-22 02:46:44,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 02:46:44,568 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 33 [2022-11-22 02:46:44,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:46:44,574 INFO L225 Difference]: With dead ends: 54 [2022-11-22 02:46:44,574 INFO L226 Difference]: Without dead ends: 52 [2022-11-22 02:46:44,575 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 [2022-11-22 02:46:44,576 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 7 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:46:44,576 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 112 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:46:44,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-11-22 02:46:44,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2022-11-22 02:46:44,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 31 states have (on average 1.2258064516129032) internal successors, (38), 32 states have internal predecessors, (38), 14 states have call successors, (14), 5 states have call predecessors, (14), 5 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-11-22 02:46:44,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 65 transitions. [2022-11-22 02:46:44,610 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 65 transitions. Word has length 33 [2022-11-22 02:46:44,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:46:44,611 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 65 transitions. [2022-11-22 02:46:44,611 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-22 02:46:44,612 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 65 transitions. [2022-11-22 02:46:44,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-11-22 02:46:44,615 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:46:44,615 INFO L195 NwaCegarLoop]: trace histogram [4, 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] [2022-11-22 02:46:44,623 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-22 02:46:44,821 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:46:44,822 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:46:44,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:46:44,822 INFO L85 PathProgramCache]: Analyzing trace with hash 613928483, now seen corresponding path program 1 times [2022-11-22 02:46:44,823 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:46:44,823 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2131119521] [2022-11-22 02:46:44,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:46:44,823 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:46:44,846 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:46:44,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2011493157] [2022-11-22 02:46:44,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:46:44,852 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:46:44,852 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:46:44,854 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:46:44,879 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-22 02:46:44,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:46:44,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-22 02:46:44,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:46:45,133 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-22 02:46:45,134 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:46:45,278 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:46:45,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2131119521] [2022-11-22 02:46:45,278 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:46:45,279 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2011493157] [2022-11-22 02:46:45,279 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2011493157] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:46:45,279 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2116451595] [2022-11-22 02:46:45,283 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-11-22 02:46:45,283 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:46:45,283 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:46:45,284 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:46:45,285 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:46:46,924 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2022-11-22 02:46:46,936 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-22 02:46:46,957 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:47:02,178 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [2116451595] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:47:02,179 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-22 02:47:02,179 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [7] total 22 [2022-11-22 02:47:02,179 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [819551639] [2022-11-22 02:47:02,179 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:47:02,180 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-22 02:47:02,180 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:47:02,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-22 02:47:02,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=492, Unknown=0, NotChecked=0, Total=600 [2022-11-22 02:47:02,181 INFO L87 Difference]: Start difference. First operand 51 states and 65 transitions. Second operand has 17 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-11-22 02:47:03,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:47:03,305 INFO L93 Difference]: Finished difference Result 75 states and 90 transitions. [2022-11-22 02:47:03,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-22 02:47:03,305 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 38 [2022-11-22 02:47:03,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:47:03,307 INFO L225 Difference]: With dead ends: 75 [2022-11-22 02:47:03,307 INFO L226 Difference]: Without dead ends: 73 [2022-11-22 02:47:03,308 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 47 SyntacticMatches, 10 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 314 ImplicationChecksByTransitivity, 15.3s TimeCoverageRelationStatistics Valid=108, Invalid=492, Unknown=0, NotChecked=0, Total=600 [2022-11-22 02:47:03,309 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 7 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 303 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 308 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 303 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:47:03,310 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 117 Invalid, 308 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 303 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-22 02:47:03,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-11-22 02:47:03,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2022-11-22 02:47:03,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 43 states have (on average 1.1627906976744187) internal successors, (50), 45 states have internal predecessors, (50), 18 states have call successors, (18), 9 states have call predecessors, (18), 9 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2022-11-22 02:47:03,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 85 transitions. [2022-11-22 02:47:03,352 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 85 transitions. Word has length 38 [2022-11-22 02:47:03,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:47:03,352 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 85 transitions. [2022-11-22 02:47:03,353 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-11-22 02:47:03,353 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 85 transitions. [2022-11-22 02:47:03,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-22 02:47:03,358 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:47:03,358 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 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] [2022-11-22 02:47:03,367 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-22 02:47:03,562 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:47:03,563 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:47:03,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:47:03,563 INFO L85 PathProgramCache]: Analyzing trace with hash 55138950, now seen corresponding path program 1 times [2022-11-22 02:47:03,563 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:47:03,563 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1472000947] [2022-11-22 02:47:03,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:47:03,564 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:47:03,573 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:47:03,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [978544850] [2022-11-22 02:47:03,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:47:03,574 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:47:03,574 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:47:03,575 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:47:03,584 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-22 02:47:03,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:47:03,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-22 02:47:03,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:47:03,724 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-22 02:47:03,725 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:47:03,828 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-22 02:47:03,828 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:47:03,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1472000947] [2022-11-22 02:47:03,829 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:47:03,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [978544850] [2022-11-22 02:47:03,829 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [978544850] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:47:03,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [561735229] [2022-11-22 02:47:03,832 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-22 02:47:03,832 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:47:03,833 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:47:03,833 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:47:03,833 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:47:17,166 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 16 for LOIs [2022-11-22 02:47:17,173 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-22 02:47:17,193 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:47:29,009 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [561735229] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:47:29,009 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:47:29,009 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [5, 6] total 26 [2022-11-22 02:47:29,010 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278460518] [2022-11-22 02:47:29,010 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:47:29,010 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-22 02:47:29,010 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:47:29,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-22 02:47:29,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=492, Unknown=0, NotChecked=0, Total=650 [2022-11-22 02:47:29,012 INFO L87 Difference]: Start difference. First operand 71 states and 85 transitions. Second operand has 18 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-11-22 02:47:32,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:47:32,537 INFO L93 Difference]: Finished difference Result 114 states and 143 transitions. [2022-11-22 02:47:32,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-22 02:47:32,538 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 47 [2022-11-22 02:47:32,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:47:32,539 INFO L225 Difference]: With dead ends: 114 [2022-11-22 02:47:32,540 INFO L226 Difference]: Without dead ends: 91 [2022-11-22 02:47:32,540 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 103 SyntacticMatches, 12 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 468 ImplicationChecksByTransitivity, 14.0s TimeCoverageRelationStatistics Valid=173, Invalid=529, Unknown=0, NotChecked=0, Total=702 [2022-11-22 02:47:32,541 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 6 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 302 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 302 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:47:32,541 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 121 Invalid, 314 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 302 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-11-22 02:47:32,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-11-22 02:47:32,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2022-11-22 02:47:32,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 57 states have (on average 1.1578947368421053) internal successors, (66), 58 states have internal predecessors, (66), 22 states have call successors, (22), 11 states have call predecessors, (22), 11 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2022-11-22 02:47:32,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 109 transitions. [2022-11-22 02:47:32,575 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 109 transitions. Word has length 47 [2022-11-22 02:47:32,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:47:32,575 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 109 transitions. [2022-11-22 02:47:32,576 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-11-22 02:47:32,576 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 109 transitions. [2022-11-22 02:47:32,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-11-22 02:47:32,577 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:47:32,577 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:47:32,592 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-22 02:47:32,783 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-11-22 02:47:32,783 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:47:32,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:47:32,784 INFO L85 PathProgramCache]: Analyzing trace with hash -885230527, now seen corresponding path program 1 times [2022-11-22 02:47:32,784 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:47:32,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1539236358] [2022-11-22 02:47:32,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:47:32,784 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:47:32,801 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:47:32,809 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1712816607] [2022-11-22 02:47:32,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:47:32,810 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:47:32,810 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:47:32,812 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:47:32,845 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-22 02:47:32,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:47:32,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-22 02:47:32,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:47:32,990 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-22 02:47:32,990 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:47:33,085 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-22 02:47:33,085 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:47:33,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1539236358] [2022-11-22 02:47:33,085 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:47:33,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1712816607] [2022-11-22 02:47:33,086 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1712816607] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:47:33,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1257645248] [2022-11-22 02:47:33,091 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-22 02:47:33,092 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:47:33,092 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:47:33,092 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:47:33,092 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:47:50,124 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-22 02:47:50,129 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-22 02:47:50,146 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:48:02,849 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3003#(and (<= 2 ~counter~0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:48:02,849 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:48:02,849 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:48:02,850 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2022-11-22 02:48:02,850 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1316549570] [2022-11-22 02:48:02,850 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:48:02,851 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-22 02:48:02,851 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:48:02,851 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-22 02:48:02,852 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=874, Unknown=0, NotChecked=0, Total=1056 [2022-11-22 02:48:02,852 INFO L87 Difference]: Start difference. First operand 91 states and 109 transitions. Second operand has 10 states, 10 states have (on average 3.4) internal successors, (34), 10 states have internal predecessors, (34), 5 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2022-11-22 02:48:03,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:48:03,188 INFO L93 Difference]: Finished difference Result 239 states and 287 transitions. [2022-11-22 02:48:03,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-22 02:48:03,189 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 10 states have internal predecessors, (34), 5 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) Word has length 49 [2022-11-22 02:48:03,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:48:03,191 INFO L225 Difference]: With dead ends: 239 [2022-11-22 02:48:03,191 INFO L226 Difference]: Without dead ends: 216 [2022-11-22 02:48:03,193 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 475 ImplicationChecksByTransitivity, 12.8s TimeCoverageRelationStatistics Valid=212, Invalid=1120, Unknown=0, NotChecked=0, Total=1332 [2022-11-22 02:48:03,194 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 88 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 197 SdHoareTripleChecker+Invalid, 154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:48:03,194 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 197 Invalid, 154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:48:03,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2022-11-22 02:48:03,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 202. [2022-11-22 02:48:03,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 130 states have (on average 1.1615384615384616) internal successors, (151), 133 states have internal predecessors, (151), 46 states have call successors, (46), 25 states have call predecessors, (46), 25 states have return successors, (43), 43 states have call predecessors, (43), 43 states have call successors, (43) [2022-11-22 02:48:03,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 240 transitions. [2022-11-22 02:48:03,247 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 240 transitions. Word has length 49 [2022-11-22 02:48:03,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:48:03,248 INFO L495 AbstractCegarLoop]: Abstraction has 202 states and 240 transitions. [2022-11-22 02:48:03,248 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 10 states have internal predecessors, (34), 5 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2022-11-22 02:48:03,248 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 240 transitions. [2022-11-22 02:48:03,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-22 02:48:03,249 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:48:03,249 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:48:03,264 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-22 02:48:03,455 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:48:03,455 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:48:03,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:48:03,456 INFO L85 PathProgramCache]: Analyzing trace with hash -1699609543, now seen corresponding path program 1 times [2022-11-22 02:48:03,456 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:48:03,456 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1256427363] [2022-11-22 02:48:03,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:48:03,456 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:48:03,466 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:48:03,466 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1889245408] [2022-11-22 02:48:03,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:48:03,467 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:48:03,467 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:48:03,468 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:48:03,482 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-22 02:48:03,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:48:03,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-22 02:48:03,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:48:03,679 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 28 proven. 10 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-22 02:48:03,680 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:48:03,819 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 28 proven. 10 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-22 02:48:03,820 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:48:03,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1256427363] [2022-11-22 02:48:03,820 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:48:03,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1889245408] [2022-11-22 02:48:03,820 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1889245408] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:48:03,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [515493572] [2022-11-22 02:48:03,827 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-22 02:48:03,827 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:48:03,827 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:48:03,828 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:48:03,828 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:48:10,085 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-22 02:48:10,090 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-22 02:48:10,117 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:48:22,740 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4033#(and (<= 2 ~counter~0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:48:22,740 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:48:22,740 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:48:22,740 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2022-11-22 02:48:22,740 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [15582219] [2022-11-22 02:48:22,740 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:48:22,741 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-22 02:48:22,741 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:48:22,741 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-22 02:48:22,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=746, Unknown=0, NotChecked=0, Total=870 [2022-11-22 02:48:22,742 INFO L87 Difference]: Start difference. First operand 202 states and 240 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) [2022-11-22 02:48:23,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:48:23,336 INFO L93 Difference]: Finished difference Result 231 states and 277 transitions. [2022-11-22 02:48:23,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-22 02:48:23,337 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) Word has length 61 [2022-11-22 02:48:23,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:48:23,340 INFO L225 Difference]: With dead ends: 231 [2022-11-22 02:48:23,340 INFO L226 Difference]: Without dead ends: 229 [2022-11-22 02:48:23,341 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 278 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=140, Invalid=852, Unknown=0, NotChecked=0, Total=992 [2022-11-22 02:48:23,342 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 19 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 02:48:23,342 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 76 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 02:48:23,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2022-11-22 02:48:23,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 228. [2022-11-22 02:48:23,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 145 states have (on average 1.1448275862068966) internal successors, (166), 150 states have internal predecessors, (166), 54 states have call successors, (54), 28 states have call predecessors, (54), 28 states have return successors, (51), 49 states have call predecessors, (51), 51 states have call successors, (51) [2022-11-22 02:48:23,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 271 transitions. [2022-11-22 02:48:23,391 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 271 transitions. Word has length 61 [2022-11-22 02:48:23,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:48:23,391 INFO L495 AbstractCegarLoop]: Abstraction has 228 states and 271 transitions. [2022-11-22 02:48:23,391 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 2 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) [2022-11-22 02:48:23,392 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 271 transitions. [2022-11-22 02:48:23,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-11-22 02:48:23,393 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:48:23,393 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:48:23,401 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-22 02:48:23,601 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-22 02:48:23,601 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:48:23,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:48:23,601 INFO L85 PathProgramCache]: Analyzing trace with hash 1184603440, now seen corresponding path program 1 times [2022-11-22 02:48:23,602 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:48:23,602 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [303333252] [2022-11-22 02:48:23,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:48:23,602 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:48:23,610 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:48:23,610 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1175770073] [2022-11-22 02:48:23,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:48:23,610 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:48:23,611 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:48:23,612 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:48:23,624 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-22 02:48:23,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:48:23,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-22 02:48:23,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:48:23,787 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 16 proven. 73 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2022-11-22 02:48:23,788 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:48:23,906 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-11-22 02:48:23,907 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:48:23,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [303333252] [2022-11-22 02:48:23,907 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:48:23,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1175770073] [2022-11-22 02:48:23,908 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1175770073] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:48:23,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [970598574] [2022-11-22 02:48:23,915 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-22 02:48:23,916 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:48:23,916 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:48:23,916 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:48:23,916 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:48:36,508 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2022-11-22 02:48:36,511 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-22 02:48:36,524 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:48:41,118 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5147#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2022-11-22 02:48:41,118 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:48:41,118 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:48:41,118 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 12 [2022-11-22 02:48:41,119 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852103703] [2022-11-22 02:48:41,119 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:48:41,119 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-22 02:48:41,120 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:48:41,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-22 02:48:41,121 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=779, Unknown=0, NotChecked=0, Total=992 [2022-11-22 02:48:41,121 INFO L87 Difference]: Start difference. First operand 228 states and 271 transitions. Second operand has 12 states, 12 states have (on average 3.5) internal successors, (42), 12 states have internal predecessors, (42), 7 states have call successors, (25), 5 states have call predecessors, (25), 4 states have return successors, (24), 6 states have call predecessors, (24), 6 states have call successors, (24) [2022-11-22 02:48:41,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:48:41,497 INFO L93 Difference]: Finished difference Result 372 states and 446 transitions. [2022-11-22 02:48:41,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-22 02:48:41,498 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.5) internal successors, (42), 12 states have internal predecessors, (42), 7 states have call successors, (25), 5 states have call predecessors, (25), 4 states have return successors, (24), 6 states have call predecessors, (24), 6 states have call successors, (24) Word has length 70 [2022-11-22 02:48:41,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:48:41,500 INFO L225 Difference]: With dead ends: 372 [2022-11-22 02:48:41,500 INFO L226 Difference]: Without dead ends: 352 [2022-11-22 02:48:41,501 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 178 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 537 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=271, Invalid=1135, Unknown=0, NotChecked=0, Total=1406 [2022-11-22 02:48:41,503 INFO L413 NwaCegarLoop]: 61 mSDtfsCounter, 122 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 288 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:48:41,503 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [122 Valid, 288 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 118 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:48:41,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2022-11-22 02:48:41,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 336. [2022-11-22 02:48:41,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 336 states, 209 states have (on average 1.1483253588516746) internal successors, (240), 218 states have internal predecessors, (240), 86 states have call successors, (86), 40 states have call predecessors, (86), 40 states have return successors, (81), 77 states have call predecessors, (81), 81 states have call successors, (81) [2022-11-22 02:48:41,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 407 transitions. [2022-11-22 02:48:41,575 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 407 transitions. Word has length 70 [2022-11-22 02:48:41,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:48:41,575 INFO L495 AbstractCegarLoop]: Abstraction has 336 states and 407 transitions. [2022-11-22 02:48:41,575 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.5) internal successors, (42), 12 states have internal predecessors, (42), 7 states have call successors, (25), 5 states have call predecessors, (25), 4 states have return successors, (24), 6 states have call predecessors, (24), 6 states have call successors, (24) [2022-11-22 02:48:41,576 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 407 transitions. [2022-11-22 02:48:41,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-11-22 02:48:41,577 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:48:41,577 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:48:41,583 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-22 02:48:41,779 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-22 02:48:41,779 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:48:41,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:48:41,779 INFO L85 PathProgramCache]: Analyzing trace with hash -1938585712, now seen corresponding path program 1 times [2022-11-22 02:48:41,780 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:48:41,780 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [572351067] [2022-11-22 02:48:41,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:48:41,780 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:48:41,788 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:48:41,789 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1706095838] [2022-11-22 02:48:41,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:48:41,789 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:48:41,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:48:41,790 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:48:41,811 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-22 02:48:41,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:48:41,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 43 conjunts are in the unsatisfiable core [2022-11-22 02:48:41,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:48:42,524 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 16 proven. 13 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2022-11-22 02:48:42,524 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:48:43,438 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-11-22 02:48:43,438 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:48:43,438 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [572351067] [2022-11-22 02:48:43,438 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:48:43,438 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1706095838] [2022-11-22 02:48:43,439 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1706095838] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:48:43,439 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [417404571] [2022-11-22 02:48:43,442 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-22 02:48:43,443 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:48:43,444 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:48:43,444 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:48:43,444 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:48:58,270 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-22 02:48:58,275 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-22 02:48:58,290 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:49:08,566 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6649#(and (<= 2 ~counter~0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:49:08,566 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:49:08,566 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:49:08,567 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 20 [2022-11-22 02:49:08,567 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443173875] [2022-11-22 02:49:08,567 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:49:08,567 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-22 02:49:08,568 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:49:08,568 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-22 02:49:08,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1632, Unknown=0, NotChecked=0, Total=1806 [2022-11-22 02:49:08,569 INFO L87 Difference]: Start difference. First operand 336 states and 407 transitions. Second operand has 20 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 10 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) [2022-11-22 02:49:23,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:49:23,174 INFO L93 Difference]: Finished difference Result 458 states and 584 transitions. [2022-11-22 02:49:23,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-22 02:49:23,174 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 10 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) Word has length 71 [2022-11-22 02:49:23,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:49:23,177 INFO L225 Difference]: With dead ends: 458 [2022-11-22 02:49:23,178 INFO L226 Difference]: Without dead ends: 454 [2022-11-22 02:49:23,179 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1161 ImplicationChecksByTransitivity, 18.7s TimeCoverageRelationStatistics Valid=491, Invalid=3799, Unknown=0, NotChecked=0, Total=4290 [2022-11-22 02:49:23,186 INFO L413 NwaCegarLoop]: 82 mSDtfsCounter, 234 mSDsluCounter, 472 mSDsCounter, 0 mSdLazyCounter, 912 mSolverCounterSat, 238 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 238 SdHoareTripleChecker+Valid, 554 SdHoareTripleChecker+Invalid, 1150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 238 IncrementalHoareTripleChecker+Valid, 912 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.7s IncrementalHoareTripleChecker+Time [2022-11-22 02:49:23,187 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [238 Valid, 554 Invalid, 1150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [238 Valid, 912 Invalid, 0 Unknown, 0 Unchecked, 6.7s Time] [2022-11-22 02:49:23,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 454 states. [2022-11-22 02:49:23,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 454 to 424. [2022-11-22 02:49:23,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 424 states, 266 states have (on average 1.1879699248120301) internal successors, (316), 274 states have internal predecessors, (316), 113 states have call successors, (113), 45 states have call predecessors, (113), 44 states have return successors, (108), 104 states have call predecessors, (108), 108 states have call successors, (108) [2022-11-22 02:49:23,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 424 states to 424 states and 537 transitions. [2022-11-22 02:49:23,326 INFO L78 Accepts]: Start accepts. Automaton has 424 states and 537 transitions. Word has length 71 [2022-11-22 02:49:23,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:49:23,327 INFO L495 AbstractCegarLoop]: Abstraction has 424 states and 537 transitions. [2022-11-22 02:49:23,327 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 10 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) [2022-11-22 02:49:23,328 INFO L276 IsEmpty]: Start isEmpty. Operand 424 states and 537 transitions. [2022-11-22 02:49:23,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-11-22 02:49:23,328 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:49:23,329 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:49:23,334 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-11-22 02:49:23,529 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:49:23,529 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:49:23,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:49:23,530 INFO L85 PathProgramCache]: Analyzing trace with hash -1382598768, now seen corresponding path program 1 times [2022-11-22 02:49:23,530 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:49:23,530 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1336518797] [2022-11-22 02:49:23,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:49:23,530 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:49:23,543 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:49:23,543 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1975249423] [2022-11-22 02:49:23,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:49:23,544 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:49:23,544 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:49:23,545 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:49:23,551 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-22 02:49:23,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:49:23,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 31 conjunts are in the unsatisfiable core [2022-11-22 02:49:23,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:49:24,257 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 35 proven. 20 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2022-11-22 02:49:24,257 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:49:24,664 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 40 proven. 7 refuted. 0 times theorem prover too weak. 137 trivial. 0 not checked. [2022-11-22 02:49:24,664 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:49:24,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1336518797] [2022-11-22 02:49:24,664 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:49:24,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1975249423] [2022-11-22 02:49:24,664 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1975249423] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:49:24,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1967021436] [2022-11-22 02:49:24,666 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-22 02:49:24,667 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:49:24,667 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:49:24,667 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:49:24,667 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:49:37,187 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2022-11-22 02:49:37,190 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-22 02:49:37,205 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:49:42,111 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8479#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2022-11-22 02:49:42,111 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:49:42,111 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:49:42,111 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 8] total 19 [2022-11-22 02:49:42,112 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [286378390] [2022-11-22 02:49:42,112 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:49:42,112 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-22 02:49:42,112 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:49:42,113 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-22 02:49:42,114 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=1440, Unknown=0, NotChecked=0, Total=1640 [2022-11-22 02:49:42,114 INFO L87 Difference]: Start difference. First operand 424 states and 537 transitions. Second operand has 19 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 15 states have internal predecessors, (42), 9 states have call successors, (24), 3 states have call predecessors, (24), 3 states have return successors, (24), 9 states have call predecessors, (24), 9 states have call successors, (24) [2022-11-22 02:49:47,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:49:47,577 INFO L93 Difference]: Finished difference Result 556 states and 710 transitions. [2022-11-22 02:49:47,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-22 02:49:47,579 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 15 states have internal predecessors, (42), 9 states have call successors, (24), 3 states have call predecessors, (24), 3 states have return successors, (24), 9 states have call predecessors, (24), 9 states have call successors, (24) Word has length 76 [2022-11-22 02:49:47,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:49:47,583 INFO L225 Difference]: With dead ends: 556 [2022-11-22 02:49:47,583 INFO L226 Difference]: Without dead ends: 522 [2022-11-22 02:49:47,585 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 195 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 823 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=316, Invalid=2336, Unknown=0, NotChecked=0, Total=2652 [2022-11-22 02:49:47,585 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 104 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 683 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 268 SdHoareTripleChecker+Invalid, 792 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 683 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2022-11-22 02:49:47,586 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [109 Valid, 268 Invalid, 792 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 683 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2022-11-22 02:49:47,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 522 states. [2022-11-22 02:49:47,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 522 to 453. [2022-11-22 02:49:47,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 453 states, 293 states have (on average 1.174061433447099) internal successors, (344), 300 states have internal predecessors, (344), 109 states have call successors, (109), 50 states have call predecessors, (109), 50 states have return successors, (105), 102 states have call predecessors, (105), 105 states have call successors, (105) [2022-11-22 02:49:47,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 453 states to 453 states and 558 transitions. [2022-11-22 02:49:47,713 INFO L78 Accepts]: Start accepts. Automaton has 453 states and 558 transitions. Word has length 76 [2022-11-22 02:49:47,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:49:47,713 INFO L495 AbstractCegarLoop]: Abstraction has 453 states and 558 transitions. [2022-11-22 02:49:47,714 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 15 states have internal predecessors, (42), 9 states have call successors, (24), 3 states have call predecessors, (24), 3 states have return successors, (24), 9 states have call predecessors, (24), 9 states have call successors, (24) [2022-11-22 02:49:47,714 INFO L276 IsEmpty]: Start isEmpty. Operand 453 states and 558 transitions. [2022-11-22 02:49:47,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-11-22 02:49:47,715 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:49:47,715 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:49:47,721 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-22 02:49:47,920 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-22 02:49:47,921 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:49:47,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:49:47,921 INFO L85 PathProgramCache]: Analyzing trace with hash -698925503, now seen corresponding path program 1 times [2022-11-22 02:49:47,921 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:49:47,922 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [766621906] [2022-11-22 02:49:47,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:49:47,922 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:49:47,937 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:49:47,938 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1370237640] [2022-11-22 02:49:47,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:49:47,938 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:49:47,938 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:49:47,939 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:49:47,967 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-22 02:49:48,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:49:48,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-22 02:49:48,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:49:49,217 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 51 proven. 26 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2022-11-22 02:49:49,218 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:49:53,003 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 51 proven. 23 refuted. 0 times theorem prover too weak. 202 trivial. 0 not checked. [2022-11-22 02:49:53,004 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:49:53,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [766621906] [2022-11-22 02:49:53,004 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:49:53,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1370237640] [2022-11-22 02:49:53,004 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1370237640] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:49:53,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1972519243] [2022-11-22 02:49:53,006 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-22 02:49:53,007 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:49:53,007 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:49:53,007 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:49:53,008 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:50:05,354 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2022-11-22 02:50:05,358 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-22 02:50:05,374 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:50:12,453 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10540#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~counter~0 21) (= |#NULL.base| 0))' at error location [2022-11-22 02:50:12,453 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:50:12,453 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:50:12,454 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11] total 21 [2022-11-22 02:50:12,454 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [617035725] [2022-11-22 02:50:12,454 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:50:12,455 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-22 02:50:12,455 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:50:12,455 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-22 02:50:12,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=1482, Unknown=0, NotChecked=0, Total=1722 [2022-11-22 02:50:12,456 INFO L87 Difference]: Start difference. First operand 453 states and 558 transitions. Second operand has 21 states, 19 states have (on average 2.526315789473684) internal successors, (48), 18 states have internal predecessors, (48), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 11 states have call predecessors, (30), 10 states have call successors, (30) [2022-11-22 02:50:15,534 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:50:44,541 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:50:55,778 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 6.43s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:51:12,973 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:51:17,651 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:51:18,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:51:18,741 INFO L93 Difference]: Finished difference Result 584 states and 743 transitions. [2022-11-22 02:51:18,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-22 02:51:18,741 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 2.526315789473684) internal successors, (48), 18 states have internal predecessors, (48), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 11 states have call predecessors, (30), 10 states have call successors, (30) Word has length 88 [2022-11-22 02:51:18,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:51:18,744 INFO L225 Difference]: With dead ends: 584 [2022-11-22 02:51:18,744 INFO L226 Difference]: Without dead ends: 582 [2022-11-22 02:51:18,746 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 221 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1113 ImplicationChecksByTransitivity, 40.8s TimeCoverageRelationStatistics Valid=537, Invalid=2999, Unknown=4, NotChecked=0, Total=3540 [2022-11-22 02:51:18,747 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 170 mSDsluCounter, 203 mSDsCounter, 0 mSdLazyCounter, 947 mSolverCounterSat, 195 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 35.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 179 SdHoareTripleChecker+Valid, 238 SdHoareTripleChecker+Invalid, 1147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 195 IncrementalHoareTripleChecker+Valid, 947 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 35.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:51:18,747 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [179 Valid, 238 Invalid, 1147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [195 Valid, 947 Invalid, 5 Unknown, 0 Unchecked, 35.2s Time] [2022-11-22 02:51:18,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 582 states. [2022-11-22 02:51:19,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 582 to 554. [2022-11-22 02:51:19,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 554 states, 362 states have (on average 1.1961325966850829) internal successors, (433), 370 states have internal predecessors, (433), 137 states have call successors, (137), 54 states have call predecessors, (137), 54 states have return successors, (133), 129 states have call predecessors, (133), 133 states have call successors, (133) [2022-11-22 02:51:19,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 554 states to 554 states and 703 transitions. [2022-11-22 02:51:19,108 INFO L78 Accepts]: Start accepts. Automaton has 554 states and 703 transitions. Word has length 88 [2022-11-22 02:51:19,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:51:19,108 INFO L495 AbstractCegarLoop]: Abstraction has 554 states and 703 transitions. [2022-11-22 02:51:19,108 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 19 states have (on average 2.526315789473684) internal successors, (48), 18 states have internal predecessors, (48), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 11 states have call predecessors, (30), 10 states have call successors, (30) [2022-11-22 02:51:19,109 INFO L276 IsEmpty]: Start isEmpty. Operand 554 states and 703 transitions. [2022-11-22 02:51:19,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-11-22 02:51:19,110 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:51:19,110 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 4, 3, 3, 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] [2022-11-22 02:51:19,120 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-22 02:51:19,317 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-22 02:51:19,317 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:51:19,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:51:19,317 INFO L85 PathProgramCache]: Analyzing trace with hash -1250044008, now seen corresponding path program 2 times [2022-11-22 02:51:19,317 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:51:19,318 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1975435237] [2022-11-22 02:51:19,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:51:19,318 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:51:19,329 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:51:19,330 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2060230286] [2022-11-22 02:51:19,330 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:51:19,330 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:51:19,330 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:51:19,332 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:51:19,343 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-22 02:51:19,409 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-22 02:51:19,410 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:51:19,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-22 02:51:19,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:51:19,452 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 48 proven. 0 refuted. 0 times theorem prover too weak. 283 trivial. 0 not checked. [2022-11-22 02:51:19,452 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-22 02:51:19,452 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:51:19,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1975435237] [2022-11-22 02:51:19,452 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:51:19,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2060230286] [2022-11-22 02:51:19,453 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2060230286] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:51:19,453 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:51:19,453 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-22 02:51:19,453 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239132973] [2022-11-22 02:51:19,453 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:51:19,453 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 02:51:19,454 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:51:19,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 02:51:19,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-22 02:51:19,454 INFO L87 Difference]: Start difference. First operand 554 states and 703 transitions. Second operand has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2022-11-22 02:51:19,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:51:19,788 INFO L93 Difference]: Finished difference Result 722 states and 935 transitions. [2022-11-22 02:51:19,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 02:51:19,789 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) Word has length 98 [2022-11-22 02:51:19,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:51:19,792 INFO L225 Difference]: With dead ends: 722 [2022-11-22 02:51:19,792 INFO L226 Difference]: Without dead ends: 519 [2022-11-22 02:51:19,793 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 [2022-11-22 02:51:19,794 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 12 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:51:19,794 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 147 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:51:19,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 519 states. [2022-11-22 02:51:20,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 519 to 494. [2022-11-22 02:51:20,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 494 states, 319 states have (on average 1.188087774294671) internal successors, (379), 327 states have internal predecessors, (379), 126 states have call successors, (126), 48 states have call predecessors, (126), 48 states have return successors, (123), 118 states have call predecessors, (123), 123 states have call successors, (123) [2022-11-22 02:51:20,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 494 states to 494 states and 628 transitions. [2022-11-22 02:51:20,076 INFO L78 Accepts]: Start accepts. Automaton has 494 states and 628 transitions. Word has length 98 [2022-11-22 02:51:20,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:51:20,077 INFO L495 AbstractCegarLoop]: Abstraction has 494 states and 628 transitions. [2022-11-22 02:51:20,077 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2022-11-22 02:51:20,077 INFO L276 IsEmpty]: Start isEmpty. Operand 494 states and 628 transitions. [2022-11-22 02:51:20,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2022-11-22 02:51:20,079 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:51:20,080 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:51:20,087 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-22 02:51:20,286 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-22 02:51:20,287 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:51:20,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:51:20,287 INFO L85 PathProgramCache]: Analyzing trace with hash 1144504099, now seen corresponding path program 1 times [2022-11-22 02:51:20,287 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:51:20,287 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [165319100] [2022-11-22 02:51:20,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:51:20,288 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:51:20,299 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:51:20,300 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [860563188] [2022-11-22 02:51:20,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:51:20,300 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:51:20,300 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:51:20,301 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:51:20,340 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-22 02:51:20,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:51:20,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 306 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-22 02:51:20,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:51:20,614 INFO L134 CoverageAnalysis]: Checked inductivity of 348 backedges. 35 proven. 229 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-11-22 02:51:20,614 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:51:20,836 INFO L134 CoverageAnalysis]: Checked inductivity of 348 backedges. 35 proven. 37 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2022-11-22 02:51:20,836 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:51:20,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [165319100] [2022-11-22 02:51:20,837 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:51:20,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [860563188] [2022-11-22 02:51:20,837 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [860563188] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:51:20,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1897889563] [2022-11-22 02:51:20,838 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-22 02:51:20,839 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:51:20,839 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:51:20,839 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:51:20,839 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:51:27,350 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2022-11-22 02:51:27,355 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-22 02:51:27,368 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:51:32,480 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14963#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2022-11-22 02:51:32,480 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:51:32,480 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:51:32,480 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 18 [2022-11-22 02:51:32,480 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649573441] [2022-11-22 02:51:32,480 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:51:32,481 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-22 02:51:32,481 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:51:32,482 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-22 02:51:32,482 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=323, Invalid=1083, Unknown=0, NotChecked=0, Total=1406 [2022-11-22 02:51:32,482 INFO L87 Difference]: Start difference. First operand 494 states and 628 transitions. Second operand has 18 states, 18 states have (on average 3.8333333333333335) internal successors, (69), 18 states have internal predecessors, (69), 9 states have call successors, (33), 6 states have call predecessors, (33), 5 states have return successors, (32), 8 states have call predecessors, (32), 8 states have call successors, (32) [2022-11-22 02:51:33,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:51:33,922 INFO L93 Difference]: Finished difference Result 1252 states and 1698 transitions. [2022-11-22 02:51:33,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-22 02:51:33,923 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.8333333333333335) internal successors, (69), 18 states have internal predecessors, (69), 9 states have call successors, (33), 6 states have call predecessors, (33), 5 states have return successors, (32), 8 states have call predecessors, (32), 8 states have call successors, (32) Word has length 104 [2022-11-22 02:51:33,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:51:33,928 INFO L225 Difference]: With dead ends: 1252 [2022-11-22 02:51:33,928 INFO L226 Difference]: Without dead ends: 1132 [2022-11-22 02:51:33,930 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 274 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 920 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=509, Invalid=1941, Unknown=0, NotChecked=0, Total=2450 [2022-11-22 02:51:33,931 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 283 mSDsluCounter, 281 mSDsCounter, 0 mSdLazyCounter, 217 mSolverCounterSat, 150 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 283 SdHoareTripleChecker+Valid, 365 SdHoareTripleChecker+Invalid, 367 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 150 IncrementalHoareTripleChecker+Valid, 217 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-22 02:51:33,931 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [283 Valid, 365 Invalid, 367 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [150 Valid, 217 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-22 02:51:33,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1132 states. [2022-11-22 02:51:34,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1132 to 1108. [2022-11-22 02:51:34,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1108 states, 691 states have (on average 1.1765557163531115) internal successors, (813), 708 states have internal predecessors, (813), 320 states have call successors, (320), 96 states have call predecessors, (320), 96 states have return successors, (311), 303 states have call predecessors, (311), 311 states have call successors, (311) [2022-11-22 02:51:34,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1108 states to 1108 states and 1444 transitions. [2022-11-22 02:51:34,740 INFO L78 Accepts]: Start accepts. Automaton has 1108 states and 1444 transitions. Word has length 104 [2022-11-22 02:51:34,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:51:34,743 INFO L495 AbstractCegarLoop]: Abstraction has 1108 states and 1444 transitions. [2022-11-22 02:51:34,743 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.8333333333333335) internal successors, (69), 18 states have internal predecessors, (69), 9 states have call successors, (33), 6 states have call predecessors, (33), 5 states have return successors, (32), 8 states have call predecessors, (32), 8 states have call successors, (32) [2022-11-22 02:51:34,743 INFO L276 IsEmpty]: Start isEmpty. Operand 1108 states and 1444 transitions. [2022-11-22 02:51:34,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2022-11-22 02:51:34,749 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:51:34,749 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:51:34,764 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-22 02:51:34,956 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-22 02:51:34,956 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:51:34,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:51:34,957 INFO L85 PathProgramCache]: Analyzing trace with hash 1878404201, now seen corresponding path program 2 times [2022-11-22 02:51:34,957 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:51:34,957 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [487569028] [2022-11-22 02:51:34,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:51:34,957 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:51:34,968 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:51:34,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [948269699] [2022-11-22 02:51:34,969 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:51:34,969 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:51:34,969 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:51:34,970 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:51:34,977 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-22 02:51:35,174 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-22 02:51:35,174 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:51:35,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 45 conjunts are in the unsatisfiable core [2022-11-22 02:51:35,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:51:35,979 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 31 proven. 39 refuted. 0 times theorem prover too weak. 373 trivial. 0 not checked. [2022-11-22 02:51:35,979 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:51:37,087 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 28 proven. 39 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2022-11-22 02:51:37,087 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:51:37,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [487569028] [2022-11-22 02:51:37,087 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:51:37,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [948269699] [2022-11-22 02:51:37,088 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [948269699] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:51:37,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1056797341] [2022-11-22 02:51:37,089 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-22 02:51:37,089 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:51:37,090 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:51:37,090 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:51:37,090 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:51:49,778 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2022-11-22 02:51:49,782 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-22 02:51:49,797 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:51:55,945 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19165#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~counter~0 21) (= |#NULL.base| 0))' at error location [2022-11-22 02:51:55,945 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:51:55,946 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:51:55,946 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 19 [2022-11-22 02:51:55,946 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [123761354] [2022-11-22 02:51:55,946 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:51:55,946 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-22 02:51:55,947 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:51:55,947 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-22 02:51:55,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=1356, Unknown=0, NotChecked=0, Total=1560 [2022-11-22 02:51:55,948 INFO L87 Difference]: Start difference. First operand 1108 states and 1444 transitions. Second operand has 19 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 17 states have internal predecessors, (49), 11 states have call successors, (36), 3 states have call predecessors, (36), 2 states have return successors, (34), 11 states have call predecessors, (34), 11 states have call successors, (34) [2022-11-22 02:52:18,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:52:18,379 INFO L93 Difference]: Finished difference Result 1688 states and 2278 transitions. [2022-11-22 02:52:18,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-22 02:52:18,380 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 17 states have internal predecessors, (49), 11 states have call successors, (36), 3 states have call predecessors, (36), 2 states have return successors, (34), 11 states have call predecessors, (34), 11 states have call successors, (34) Word has length 106 [2022-11-22 02:52:18,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:52:18,390 INFO L225 Difference]: With dead ends: 1688 [2022-11-22 02:52:18,390 INFO L226 Difference]: Without dead ends: 1686 [2022-11-22 02:52:18,393 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 278 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1510 ImplicationChecksByTransitivity, 16.8s TimeCoverageRelationStatistics Valid=702, Invalid=4554, Unknown=0, NotChecked=0, Total=5256 [2022-11-22 02:52:18,394 INFO L413 NwaCegarLoop]: 112 mSDtfsCounter, 143 mSDsluCounter, 542 mSDsCounter, 0 mSdLazyCounter, 1252 mSolverCounterSat, 182 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 654 SdHoareTripleChecker+Invalid, 1434 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 182 IncrementalHoareTripleChecker+Valid, 1252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:52:18,394 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [149 Valid, 654 Invalid, 1434 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [182 Valid, 1252 Invalid, 0 Unknown, 0 Unchecked, 11.0s Time] [2022-11-22 02:52:18,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1686 states. [2022-11-22 02:52:19,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1686 to 1572. [2022-11-22 02:52:19,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1572 states, 967 states have (on average 1.1985522233712513) internal successors, (1159), 984 states have internal predecessors, (1159), 480 states have call successors, (480), 124 states have call predecessors, (480), 124 states have return successors, (471), 463 states have call predecessors, (471), 471 states have call successors, (471) [2022-11-22 02:52:19,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1572 states to 1572 states and 2110 transitions. [2022-11-22 02:52:19,506 INFO L78 Accepts]: Start accepts. Automaton has 1572 states and 2110 transitions. Word has length 106 [2022-11-22 02:52:19,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:52:19,506 INFO L495 AbstractCegarLoop]: Abstraction has 1572 states and 2110 transitions. [2022-11-22 02:52:19,507 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 17 states have internal predecessors, (49), 11 states have call successors, (36), 3 states have call predecessors, (36), 2 states have return successors, (34), 11 states have call predecessors, (34), 11 states have call successors, (34) [2022-11-22 02:52:19,507 INFO L276 IsEmpty]: Start isEmpty. Operand 1572 states and 2110 transitions. [2022-11-22 02:52:19,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2022-11-22 02:52:19,512 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:52:19,513 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:52:19,526 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-22 02:52:19,720 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-22 02:52:19,721 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:52:19,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:52:19,722 INFO L85 PathProgramCache]: Analyzing trace with hash -1268150453, now seen corresponding path program 3 times [2022-11-22 02:52:19,722 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:52:19,722 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [86889909] [2022-11-22 02:52:19,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:52:19,722 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:52:19,744 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:52:19,755 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1571970880] [2022-11-22 02:52:19,755 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:52:19,756 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:52:19,756 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:52:19,757 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:52:19,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-22 02:52:19,868 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:52:19,868 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:52:19,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 68 conjunts are in the unsatisfiable core [2022-11-22 02:52:19,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:52:20,941 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 57 proven. 59 refuted. 0 times theorem prover too weak. 334 trivial. 0 not checked. [2022-11-22 02:52:20,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:52:23,907 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 65 proven. 48 refuted. 0 times theorem prover too weak. 337 trivial. 0 not checked. [2022-11-22 02:52:23,907 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:52:23,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [86889909] [2022-11-22 02:52:23,907 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:52:23,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1571970880] [2022-11-22 02:52:23,908 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1571970880] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:52:23,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1128288913] [2022-11-22 02:52:23,910 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-22 02:52:23,910 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:52:23,910 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:52:23,911 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:52:23,911 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:52:39,525 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-22 02:52:39,529 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-22 02:52:39,544 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:52:50,026 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24839#(and (<= 2 ~counter~0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:52:50,026 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:52:50,026 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:52:50,026 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14] total 27 [2022-11-22 02:52:50,026 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1255264938] [2022-11-22 02:52:50,026 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:52:50,027 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-22 02:52:50,027 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:52:50,028 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-22 02:52:50,029 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=2101, Unknown=0, NotChecked=0, Total=2352 [2022-11-22 02:52:50,029 INFO L87 Difference]: Start difference. First operand 1572 states and 2110 transitions. Second operand has 27 states, 26 states have (on average 2.3846153846153846) internal successors, (62), 24 states have internal predecessors, (62), 13 states have call successors, (37), 3 states have call predecessors, (37), 3 states have return successors, (36), 13 states have call predecessors, (36), 13 states have call successors, (36) [2022-11-22 02:53:23,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:53:23,900 INFO L93 Difference]: Finished difference Result 1957 states and 2610 transitions. [2022-11-22 02:53:23,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-22 02:53:23,901 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 2.3846153846153846) internal successors, (62), 24 states have internal predecessors, (62), 13 states have call successors, (37), 3 states have call predecessors, (37), 3 states have return successors, (36), 13 states have call predecessors, (36), 13 states have call successors, (36) Word has length 110 [2022-11-22 02:53:23,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:53:23,910 INFO L225 Difference]: With dead ends: 1957 [2022-11-22 02:53:23,911 INFO L226 Difference]: Without dead ends: 1953 [2022-11-22 02:53:23,913 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 280 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1891 ImplicationChecksByTransitivity, 30.8s TimeCoverageRelationStatistics Valid=859, Invalid=5460, Unknown=1, NotChecked=0, Total=6320 [2022-11-22 02:53:23,914 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 288 mSDsluCounter, 335 mSDsCounter, 0 mSdLazyCounter, 1372 mSolverCounterSat, 371 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 290 SdHoareTripleChecker+Valid, 381 SdHoareTripleChecker+Invalid, 1743 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 371 IncrementalHoareTripleChecker+Valid, 1372 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.6s IncrementalHoareTripleChecker+Time [2022-11-22 02:53:23,915 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [290 Valid, 381 Invalid, 1743 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [371 Valid, 1372 Invalid, 0 Unknown, 0 Unchecked, 13.6s Time] [2022-11-22 02:53:23,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1953 states. [2022-11-22 02:53:25,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1953 to 1837. [2022-11-22 02:53:25,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1837 states, 1145 states have (on average 1.1965065502183405) internal successors, (1370), 1166 states have internal predecessors, (1370), 535 states have call successors, (535), 157 states have call predecessors, (535), 156 states have return successors, (526), 513 states have call predecessors, (526), 526 states have call successors, (526) [2022-11-22 02:53:25,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1837 states to 1837 states and 2431 transitions. [2022-11-22 02:53:25,568 INFO L78 Accepts]: Start accepts. Automaton has 1837 states and 2431 transitions. Word has length 110 [2022-11-22 02:53:25,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:53:25,568 INFO L495 AbstractCegarLoop]: Abstraction has 1837 states and 2431 transitions. [2022-11-22 02:53:25,568 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 2.3846153846153846) internal successors, (62), 24 states have internal predecessors, (62), 13 states have call successors, (37), 3 states have call predecessors, (37), 3 states have return successors, (36), 13 states have call predecessors, (36), 13 states have call successors, (36) [2022-11-22 02:53:25,569 INFO L276 IsEmpty]: Start isEmpty. Operand 1837 states and 2431 transitions. [2022-11-22 02:53:25,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2022-11-22 02:53:25,570 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:53:25,571 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:53:25,576 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-22 02:53:25,776 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:53:25,776 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:53:25,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:53:25,777 INFO L85 PathProgramCache]: Analyzing trace with hash -600095698, now seen corresponding path program 3 times [2022-11-22 02:53:25,777 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:53:25,777 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [35293766] [2022-11-22 02:53:25,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:53:25,777 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:53:25,788 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:53:25,788 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1557020434] [2022-11-22 02:53:25,788 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:53:25,789 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:53:25,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:53:25,790 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:53:25,803 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-22 02:53:25,898 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:53:25,898 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:53:25,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 65 conjunts are in the unsatisfiable core [2022-11-22 02:53:25,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:53:27,197 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 32 proven. 55 refuted. 0 times theorem prover too weak. 489 trivial. 0 not checked. [2022-11-22 02:53:27,197 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:53:30,494 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 32 proven. 52 refuted. 0 times theorem prover too weak. 492 trivial. 0 not checked. [2022-11-22 02:53:30,494 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:53:30,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [35293766] [2022-11-22 02:53:30,494 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:53:30,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1557020434] [2022-11-22 02:53:30,494 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1557020434] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:53:30,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [78606014] [2022-11-22 02:53:30,496 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-22 02:53:30,496 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:53:30,496 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:53:30,497 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:53:30,497 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:53:44,690 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-22 02:53:44,695 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-22 02:53:44,710 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:53:59,173 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31348#(and (<= 2 ~counter~0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= ~counter~0 21) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:53:59,174 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:53:59,174 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:53:59,174 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 27 [2022-11-22 02:53:59,174 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884217485] [2022-11-22 02:53:59,174 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:53:59,175 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-22 02:53:59,175 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:53:59,175 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-22 02:53:59,176 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=252, Invalid=2198, Unknown=0, NotChecked=0, Total=2450 [2022-11-22 02:53:59,176 INFO L87 Difference]: Start difference. First operand 1837 states and 2431 transitions. Second operand has 27 states, 24 states have (on average 2.4583333333333335) internal successors, (59), 24 states have internal predecessors, (59), 14 states have call successors, (41), 3 states have call predecessors, (41), 2 states have return successors, (40), 12 states have call predecessors, (40), 12 states have call successors, (40) [2022-11-22 02:54:28,708 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-22 02:55:16,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:55:16,854 INFO L93 Difference]: Finished difference Result 2196 states and 2931 transitions. [2022-11-22 02:55:16,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-11-22 02:55:16,855 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 24 states have (on average 2.4583333333333335) internal successors, (59), 24 states have internal predecessors, (59), 14 states have call successors, (41), 3 states have call predecessors, (41), 2 states have return successors, (40), 12 states have call predecessors, (40), 12 states have call successors, (40) Word has length 121 [2022-11-22 02:55:16,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:55:16,864 INFO L225 Difference]: With dead ends: 2196 [2022-11-22 02:55:16,864 INFO L226 Difference]: Without dead ends: 2161 [2022-11-22 02:55:16,869 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 416 GetRequests, 312 SyntacticMatches, 1 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3510 ImplicationChecksByTransitivity, 58.0s TimeCoverageRelationStatistics Valid=1462, Invalid=9457, Unknown=1, NotChecked=0, Total=10920 [2022-11-22 02:55:16,870 INFO L413 NwaCegarLoop]: 155 mSDtfsCounter, 362 mSDsluCounter, 1046 mSDsCounter, 0 mSdLazyCounter, 2353 mSolverCounterSat, 522 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 34.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 370 SdHoareTripleChecker+Valid, 1201 SdHoareTripleChecker+Invalid, 2876 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 522 IncrementalHoareTripleChecker+Valid, 2353 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 35.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:55:16,870 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [370 Valid, 1201 Invalid, 2876 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [522 Valid, 2353 Invalid, 1 Unknown, 0 Unchecked, 35.1s Time] [2022-11-22 02:55:16,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2161 states. [2022-11-22 02:55:18,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2161 to 2008. [2022-11-22 02:55:18,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2008 states, 1252 states have (on average 1.1956869009584665) internal successors, (1497), 1272 states have internal predecessors, (1497), 583 states have call successors, (583), 173 states have call predecessors, (583), 172 states have return successors, (574), 562 states have call predecessors, (574), 574 states have call successors, (574) [2022-11-22 02:55:18,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2008 states to 2008 states and 2654 transitions. [2022-11-22 02:55:18,278 INFO L78 Accepts]: Start accepts. Automaton has 2008 states and 2654 transitions. Word has length 121 [2022-11-22 02:55:18,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:55:18,278 INFO L495 AbstractCegarLoop]: Abstraction has 2008 states and 2654 transitions. [2022-11-22 02:55:18,279 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 24 states have (on average 2.4583333333333335) internal successors, (59), 24 states have internal predecessors, (59), 14 states have call successors, (41), 3 states have call predecessors, (41), 2 states have return successors, (40), 12 states have call predecessors, (40), 12 states have call successors, (40) [2022-11-22 02:55:18,279 INFO L276 IsEmpty]: Start isEmpty. Operand 2008 states and 2654 transitions. [2022-11-22 02:55:18,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2022-11-22 02:55:18,282 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:55:18,282 INFO L195 NwaCegarLoop]: trace histogram [20, 19, 19, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:55:18,294 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-22 02:55:18,489 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:55:18,489 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:55:18,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:55:18,490 INFO L85 PathProgramCache]: Analyzing trace with hash -1584885405, now seen corresponding path program 4 times [2022-11-22 02:55:18,490 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:55:18,490 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1533147835] [2022-11-22 02:55:18,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:55:18,490 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:55:18,504 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:55:18,504 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1720483947] [2022-11-22 02:55:18,504 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:55:18,505 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:55:18,505 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:55:18,506 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:55:18,510 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-22 02:55:19,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:55:19,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 358 conjuncts, 82 conjunts are in the unsatisfiable core [2022-11-22 02:55:19,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:55:33,466 INFO L134 CoverageAnalysis]: Checked inductivity of 810 backedges. 131 proven. 89 refuted. 0 times theorem prover too weak. 590 trivial. 0 not checked. [2022-11-22 02:55:33,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:56:00,065 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:56:00,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1533147835] [2022-11-22 02:56:00,065 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:56:00,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1720483947] [2022-11-22 02:56:00,065 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1720483947] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:56:00,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [623957741] [2022-11-22 02:56:00,067 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-22 02:56:00,067 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:56:00,068 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:56:00,068 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:56:00,068 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:56:14,245 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-22 02:56:14,249 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-22 02:56:14,263 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:56:43,959 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38506#(and (<= 2 ~counter~0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:56:43,959 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:56:43,959 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-22 02:56:43,960 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2022-11-22 02:56:43,960 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646582769] [2022-11-22 02:56:43,960 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-22 02:56:43,960 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-22 02:56:43,960 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:56:43,960 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-22 02:56:43,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=2500, Unknown=5, NotChecked=0, Total=2862 [2022-11-22 02:56:43,962 INFO L87 Difference]: Start difference. First operand 2008 states and 2654 transitions. Second operand has 20 states, 18 states have (on average 2.111111111111111) internal successors, (38), 17 states have internal predecessors, (38), 9 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 9 states have call predecessors, (23), 9 states have call successors, (23) [2022-11-22 02:56:49,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:56:49,601 INFO L93 Difference]: Finished difference Result 2085 states and 2714 transitions. [2022-11-22 02:56:49,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-22 02:56:49,601 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 2.111111111111111) internal successors, (38), 17 states have internal predecessors, (38), 9 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 9 states have call predecessors, (23), 9 states have call successors, (23) Word has length 138 [2022-11-22 02:56:49,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:56:49,611 INFO L225 Difference]: With dead ends: 2085 [2022-11-22 02:56:49,611 INFO L226 Difference]: Without dead ends: 2081 [2022-11-22 02:56:49,613 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 321 SyntacticMatches, 2 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1260 ImplicationChecksByTransitivity, 48.1s TimeCoverageRelationStatistics Valid=485, Invalid=3416, Unknown=5, NotChecked=0, Total=3906 [2022-11-22 02:56:49,614 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 85 mSDsluCounter, 323 mSDsCounter, 0 mSdLazyCounter, 1186 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 373 SdHoareTripleChecker+Invalid, 1262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 1186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:56:49,614 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 373 Invalid, 1262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 1186 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2022-11-22 02:56:49,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2081 states. [2022-11-22 02:56:50,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2081 to 2071. [2022-11-22 02:56:50,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2071 states, 1300 states have (on average 1.1876923076923076) internal successors, (1544), 1319 states have internal predecessors, (1544), 582 states have call successors, (582), 189 states have call predecessors, (582), 188 states have return successors, (574), 562 states have call predecessors, (574), 574 states have call successors, (574) [2022-11-22 02:56:50,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2071 states to 2071 states and 2700 transitions. [2022-11-22 02:56:50,959 INFO L78 Accepts]: Start accepts. Automaton has 2071 states and 2700 transitions. Word has length 138 [2022-11-22 02:56:50,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:56:50,960 INFO L495 AbstractCegarLoop]: Abstraction has 2071 states and 2700 transitions. [2022-11-22 02:56:50,960 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 2.111111111111111) internal successors, (38), 17 states have internal predecessors, (38), 9 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 9 states have call predecessors, (23), 9 states have call successors, (23) [2022-11-22 02:56:50,960 INFO L276 IsEmpty]: Start isEmpty. Operand 2071 states and 2700 transitions. [2022-11-22 02:56:50,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2022-11-22 02:56:50,963 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:56:50,963 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:56:50,974 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-22 02:56:51,173 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:56:51,174 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:56:51,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:56:51,174 INFO L85 PathProgramCache]: Analyzing trace with hash 393851770, now seen corresponding path program 4 times [2022-11-22 02:56:51,174 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:56:51,174 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1480290381] [2022-11-22 02:56:51,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:56:51,175 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:56:51,188 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:56:51,189 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [503556821] [2022-11-22 02:56:51,189 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:56:51,189 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:56:51,189 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:56:51,191 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:56:51,208 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-22 02:56:51,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:56:51,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 55 conjunts are in the unsatisfiable core [2022-11-22 02:56:51,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:56:52,551 INFO L134 CoverageAnalysis]: Checked inductivity of 885 backedges. 40 proven. 76 refuted. 0 times theorem prover too weak. 769 trivial. 0 not checked. [2022-11-22 02:56:52,551 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:56:54,495 INFO L134 CoverageAnalysis]: Checked inductivity of 885 backedges. 40 proven. 73 refuted. 0 times theorem prover too weak. 772 trivial. 0 not checked. [2022-11-22 02:56:54,496 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:56:54,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1480290381] [2022-11-22 02:56:54,496 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:56:54,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [503556821] [2022-11-22 02:56:54,496 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [503556821] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:56:54,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1230253310] [2022-11-22 02:56:54,498 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-22 02:56:54,498 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:56:54,499 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:56:54,499 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:56:54,499 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:57:06,141 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2022-11-22 02:57:06,144 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-22 02:57:06,159 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:57:14,267 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '45568#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2022-11-22 02:57:14,267 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:57:14,267 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:57:14,268 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 26 [2022-11-22 02:57:14,268 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1609552214] [2022-11-22 02:57:14,268 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:57:14,268 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-22 02:57:14,269 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:57:14,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-22 02:57:14,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=1911, Unknown=0, NotChecked=0, Total=2162 [2022-11-22 02:57:14,270 INFO L87 Difference]: Start difference. First operand 2071 states and 2700 transitions. Second operand has 26 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 23 states have internal predecessors, (57), 16 states have call successors, (49), 3 states have call predecessors, (49), 2 states have return successors, (48), 14 states have call predecessors, (48), 14 states have call successors, (48) [2022-11-22 02:58:05,087 WARN L233 SmtUtils]: Spent 5.46s on a formula simplification. DAG size of input: 72 DAG size of output: 72 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 02:58:08,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:58:08,270 INFO L93 Difference]: Finished difference Result 2230 states and 2907 transitions. [2022-11-22 02:58:08,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-11-22 02:58:08,271 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 23 states have internal predecessors, (57), 16 states have call successors, (49), 3 states have call predecessors, (49), 2 states have return successors, (48), 14 states have call predecessors, (48), 14 states have call successors, (48) Word has length 140 [2022-11-22 02:58:08,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:58:08,282 INFO L225 Difference]: With dead ends: 2230 [2022-11-22 02:58:08,282 INFO L226 Difference]: Without dead ends: 2199 [2022-11-22 02:58:08,284 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 457 GetRequests, 373 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2116 ImplicationChecksByTransitivity, 39.1s TimeCoverageRelationStatistics Valid=980, Invalid=6330, Unknown=0, NotChecked=0, Total=7310 [2022-11-22 02:58:08,285 INFO L413 NwaCegarLoop]: 148 mSDtfsCounter, 242 mSDsluCounter, 762 mSDsCounter, 0 mSdLazyCounter, 2110 mSolverCounterSat, 341 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 22.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 246 SdHoareTripleChecker+Valid, 910 SdHoareTripleChecker+Invalid, 2451 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 341 IncrementalHoareTripleChecker+Valid, 2110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 22.6s IncrementalHoareTripleChecker+Time [2022-11-22 02:58:08,285 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [246 Valid, 910 Invalid, 2451 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [341 Valid, 2110 Invalid, 0 Unknown, 0 Unchecked, 22.6s Time] [2022-11-22 02:58:08,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2199 states. [2022-11-22 02:58:09,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2199 to 2140. [2022-11-22 02:58:09,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2140 states, 1340 states have (on average 1.1835820895522389) internal successors, (1586), 1359 states have internal predecessors, (1586), 605 states have call successors, (605), 194 states have call predecessors, (605), 194 states have return successors, (598), 586 states have call predecessors, (598), 598 states have call successors, (598) [2022-11-22 02:58:09,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2140 states to 2140 states and 2789 transitions. [2022-11-22 02:58:09,923 INFO L78 Accepts]: Start accepts. Automaton has 2140 states and 2789 transitions. Word has length 140 [2022-11-22 02:58:09,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:58:09,924 INFO L495 AbstractCegarLoop]: Abstraction has 2140 states and 2789 transitions. [2022-11-22 02:58:09,924 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 23 states have (on average 2.4782608695652173) internal successors, (57), 23 states have internal predecessors, (57), 16 states have call successors, (49), 3 states have call predecessors, (49), 2 states have return successors, (48), 14 states have call predecessors, (48), 14 states have call successors, (48) [2022-11-22 02:58:09,924 INFO L276 IsEmpty]: Start isEmpty. Operand 2140 states and 2789 transitions. [2022-11-22 02:58:09,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2022-11-22 02:58:09,927 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:58:09,927 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:58:09,938 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-22 02:58:10,138 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-22 02:58:10,138 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:58:10,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:58:10,139 INFO L85 PathProgramCache]: Analyzing trace with hash 408986690, now seen corresponding path program 2 times [2022-11-22 02:58:10,139 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:58:10,139 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1118706665] [2022-11-22 02:58:10,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:58:10,139 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:58:10,146 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:58:10,146 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [877961550] [2022-11-22 02:58:10,146 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:58:10,147 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:58:10,147 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:58:10,148 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:58:10,159 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-22 02:58:10,244 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-22 02:58:10,244 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:58:10,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-22 02:58:10,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:58:10,472 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 40 proven. 728 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2022-11-22 02:58:10,472 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:58:10,735 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 40 proven. 88 refuted. 0 times theorem prover too weak. 772 trivial. 0 not checked. [2022-11-22 02:58:10,735 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:58:10,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1118706665] [2022-11-22 02:58:10,735 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:58:10,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [877961550] [2022-11-22 02:58:10,735 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [877961550] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:58:10,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2046583024] [2022-11-22 02:58:10,737 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-22 02:58:10,737 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:58:10,738 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:58:10,738 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:58:10,738 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:58:25,176 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-22 02:58:25,181 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-22 02:58:25,193 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:58:33,363 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '53056#(and (<= 2 ~counter~0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:58:33,364 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:58:33,364 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-22 02:58:33,364 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12] total 22 [2022-11-22 02:58:33,364 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354717582] [2022-11-22 02:58:33,364 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-22 02:58:33,365 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-22 02:58:33,365 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:58:33,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-22 02:58:33,366 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=436, Invalid=1544, Unknown=0, NotChecked=0, Total=1980 [2022-11-22 02:58:33,366 INFO L87 Difference]: Start difference. First operand 2140 states and 2789 transitions. Second operand has 22 states, 22 states have (on average 3.8636363636363638) internal successors, (85), 22 states have internal predecessors, (85), 13 states have call successors, (49), 8 states have call predecessors, (49), 7 states have return successors, (48), 12 states have call predecessors, (48), 12 states have call successors, (48) [2022-11-22 02:58:36,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:58:36,625 INFO L93 Difference]: Finished difference Result 3273 states and 4358 transitions. [2022-11-22 02:58:36,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-22 02:58:36,626 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.8636363636363638) internal successors, (85), 22 states have internal predecessors, (85), 13 states have call successors, (49), 8 states have call predecessors, (49), 7 states have return successors, (48), 12 states have call predecessors, (48), 12 states have call successors, (48) Word has length 147 [2022-11-22 02:58:36,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:58:36,641 INFO L225 Difference]: With dead ends: 3273 [2022-11-22 02:58:36,641 INFO L226 Difference]: Without dead ends: 3239 [2022-11-22 02:58:36,643 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 455 GetRequests, 396 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1302 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=749, Invalid=2911, Unknown=0, NotChecked=0, Total=3660 [2022-11-22 02:58:36,644 INFO L413 NwaCegarLoop]: 104 mSDtfsCounter, 449 mSDsluCounter, 419 mSDsCounter, 0 mSdLazyCounter, 364 mSolverCounterSat, 274 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 449 SdHoareTripleChecker+Valid, 523 SdHoareTripleChecker+Invalid, 638 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 274 IncrementalHoareTripleChecker+Valid, 364 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 02:58:36,644 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [449 Valid, 523 Invalid, 638 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [274 Valid, 364 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 02:58:36,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3239 states. [2022-11-22 02:58:38,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3239 to 3178. [2022-11-22 02:58:38,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3178 states, 1979 states have (on average 1.182920667003537) internal successors, (2341), 2017 states have internal predecessors, (2341), 924 states have call successors, (924), 274 states have call predecessors, (924), 274 states have return successors, (911), 886 states have call predecessors, (911), 911 states have call successors, (911) [2022-11-22 02:58:38,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3178 states to 3178 states and 4176 transitions. [2022-11-22 02:58:38,908 INFO L78 Accepts]: Start accepts. Automaton has 3178 states and 4176 transitions. Word has length 147 [2022-11-22 02:58:38,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:58:38,908 INFO L495 AbstractCegarLoop]: Abstraction has 3178 states and 4176 transitions. [2022-11-22 02:58:38,909 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 3.8636363636363638) internal successors, (85), 22 states have internal predecessors, (85), 13 states have call successors, (49), 8 states have call predecessors, (49), 7 states have return successors, (48), 12 states have call predecessors, (48), 12 states have call successors, (48) [2022-11-22 02:58:38,909 INFO L276 IsEmpty]: Start isEmpty. Operand 3178 states and 4176 transitions. [2022-11-22 02:58:38,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2022-11-22 02:58:38,912 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:58:38,912 INFO L195 NwaCegarLoop]: trace histogram [24, 23, 23, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:58:38,919 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-22 02:58:39,119 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-11-22 02:58:39,119 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:58:39,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:58:39,119 INFO L85 PathProgramCache]: Analyzing trace with hash 526567797, now seen corresponding path program 5 times [2022-11-22 02:58:39,119 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:58:39,119 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [328575408] [2022-11-22 02:58:39,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:58:39,120 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:58:39,129 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:58:39,129 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1595049477] [2022-11-22 02:58:39,129 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:58:39,130 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:58:39,130 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:58:39,131 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:58:39,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-22 02:58:40,098 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-22 02:58:40,098 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:58:40,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 73 conjunts are in the unsatisfiable core [2022-11-22 02:58:40,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:58:42,626 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 164 proven. 100 refuted. 0 times theorem prover too weak. 916 trivial. 0 not checked. [2022-11-22 02:58:42,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:58:50,230 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:58:50,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [328575408] [2022-11-22 02:58:50,231 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-22 02:58:50,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1595049477] [2022-11-22 02:58:50,231 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1595049477] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:58:50,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1618550205] [2022-11-22 02:58:50,235 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-22 02:58:50,235 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:58:50,236 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:58:50,236 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:58:50,236 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:59:04,079 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-22 02:59:04,083 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 60 for LOIs [2022-11-22 02:59:04,097 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:59:17,256 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '63445#(and (<= 2 ~counter~0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:59:17,257 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:59:17,257 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-22 02:59:17,257 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2022-11-22 02:59:17,257 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [138471152] [2022-11-22 02:59:17,257 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-22 02:59:17,257 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-22 02:59:17,258 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:59:17,258 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-22 02:59:17,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=284, Invalid=2067, Unknown=1, NotChecked=0, Total=2352 [2022-11-22 02:59:17,258 INFO L87 Difference]: Start difference. First operand 3178 states and 4176 transitions. Second operand has 17 states, 16 states have (on average 2.25) internal successors, (36), 14 states have internal predecessors, (36), 8 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (19), 6 states have call predecessors, (19), 8 states have call successors, (19) [2022-11-22 02:59:22,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:59:22,221 INFO L93 Difference]: Finished difference Result 3580 states and 4679 transitions. [2022-11-22 02:59:22,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-22 02:59:22,221 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.25) internal successors, (36), 14 states have internal predecessors, (36), 8 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (19), 6 states have call predecessors, (19), 8 states have call successors, (19) Word has length 161 [2022-11-22 02:59:22,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:59:22,233 INFO L225 Difference]: With dead ends: 3580 [2022-11-22 02:59:22,234 INFO L226 Difference]: Without dead ends: 3576 [2022-11-22 02:59:22,235 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 347 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 943 ImplicationChecksByTransitivity, 18.4s TimeCoverageRelationStatistics Valid=358, Invalid=2611, Unknown=1, NotChecked=0, Total=2970 [2022-11-22 02:59:22,236 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 71 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 664 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 266 SdHoareTripleChecker+Invalid, 709 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 664 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-11-22 02:59:22,237 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [81 Valid, 266 Invalid, 709 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 664 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-11-22 02:59:22,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3576 states. [2022-11-22 02:59:24,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3576 to 3531. [2022-11-22 02:59:24,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3531 states, 2190 states have (on average 1.1789954337899544) internal successors, (2582), 2228 states have internal predecessors, (2582), 1026 states have call successors, (1026), 315 states have call predecessors, (1026), 314 states have return successors, (1013), 987 states have call predecessors, (1013), 1013 states have call successors, (1013) [2022-11-22 02:59:24,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3531 states to 3531 states and 4621 transitions. [2022-11-22 02:59:24,799 INFO L78 Accepts]: Start accepts. Automaton has 3531 states and 4621 transitions. Word has length 161 [2022-11-22 02:59:24,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:59:24,800 INFO L495 AbstractCegarLoop]: Abstraction has 3531 states and 4621 transitions. [2022-11-22 02:59:24,800 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.25) internal successors, (36), 14 states have internal predecessors, (36), 8 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (19), 6 states have call predecessors, (19), 8 states have call successors, (19) [2022-11-22 02:59:24,800 INFO L276 IsEmpty]: Start isEmpty. Operand 3531 states and 4621 transitions. [2022-11-22 02:59:24,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2022-11-22 02:59:24,804 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:59:24,804 INFO L195 NwaCegarLoop]: trace histogram [24, 23, 23, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:59:24,815 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-22 02:59:25,012 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:59:25,012 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:59:25,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:59:25,012 INFO L85 PathProgramCache]: Analyzing trace with hash -1081908013, now seen corresponding path program 6 times [2022-11-22 02:59:25,012 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:59:25,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1540739772] [2022-11-22 02:59:25,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:59:25,013 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:59:25,022 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-22 02:59:25,023 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [387615530] [2022-11-22 02:59:25,023 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:59:25,023 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:59:25,023 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:59:25,024 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:59:25,028 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6b693ae3-e3d6-45f1-a068-11f28eca31f2/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-22 02:59:25,155 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:59:25,155 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:59:25,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 108 conjunts are in the unsatisfiable core [2022-11-22 02:59:25,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:59:29,325 INFO L134 CoverageAnalysis]: Checked inductivity of 1191 backedges. 251 proven. 189 refuted. 0 times theorem prover too weak. 751 trivial. 0 not checked. [2022-11-22 02:59:29,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 03:00:19,816 WARN L233 SmtUtils]: Spent 8.48s on a formula simplification that was a NOOP. DAG size: 49 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)