./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench/egcd3-ll.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench/egcd3-ll.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 4ef08007570a64191e0df13d14d3e8d62a8022f43f46779ea6f6701a621376be --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:45:34,818 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:45:34,822 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:45:34,883 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:45:34,884 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:45:34,888 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:45:34,890 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:45:34,894 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:45:34,896 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:45:34,904 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:45:34,905 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:45:34,907 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:45:34,908 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:45:34,911 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:45:34,914 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:45:34,923 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:45:34,924 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:45:34,925 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:45:34,928 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:45:34,935 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:45:34,938 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:45:34,940 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:45:34,943 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:45:34,944 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:45:34,954 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:45:34,955 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:45:34,955 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:45:34,956 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:45:34,957 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:45:34,958 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:45:34,958 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:45:34,959 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:45:34,960 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:45:34,961 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:45:34,962 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:45:34,962 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:45:34,963 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:45:34,963 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:45:34,963 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:45:34,964 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:45:34,965 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:45:34,968 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:45:34,996 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:45:34,996 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:45:34,996 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:45:34,996 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:45:34,997 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:45:34,997 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:45:34,997 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:45:34,997 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:45:34,997 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:45:34,998 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:45:34,998 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:45:34,998 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:45:34,998 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:45:34,998 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:45:34,999 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:45:34,999 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:45:34,999 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:45:35,007 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:45:35,009 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:45:35,009 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:45:35,009 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:45:35,009 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:45:35,010 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:45:35,010 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:45:35,010 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:45:35,010 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:45:35,012 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:45:35,013 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:45:35,013 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:45:35,013 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:45:35,014 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:45:35,014 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:45:35,014 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:45:35,015 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:45:35,015 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:45:35,015 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:45:35,015 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:45:35,015 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:45:35,016 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:45:35,016 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:45:35,016 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:45:35,016 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4ef08007570a64191e0df13d14d3e8d62a8022f43f46779ea6f6701a621376be [2021-11-21 01:45:35,275 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:45:35,305 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:45:35,318 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:45:35,319 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:45:35,320 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:45:35,321 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/nla-digbench/egcd3-ll.c [2021-11-21 01:45:35,433 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/data/7fa38dc5c/bb076b5c43bf44a3951052bfda50d67c/FLAG97cef229d [2021-11-21 01:45:35,845 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:45:35,846 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/sv-benchmarks/c/nla-digbench/egcd3-ll.c [2021-11-21 01:45:35,852 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/data/7fa38dc5c/bb076b5c43bf44a3951052bfda50d67c/FLAG97cef229d [2021-11-21 01:45:36,245 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/data/7fa38dc5c/bb076b5c43bf44a3951052bfda50d67c [2021-11-21 01:45:36,248 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:45:36,249 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:45:36,251 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:45:36,251 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:45:36,264 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:45:36,265 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:45:36" (1/1) ... [2021-11-21 01:45:36,266 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6523e6a9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:45:36, skipping insertion in model container [2021-11-21 01:45:36,267 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:45:36" (1/1) ... [2021-11-21 01:45:36,275 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:45:36,290 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:45:36,450 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/sv-benchmarks/c/nla-digbench/egcd3-ll.c[490,503] [2021-11-21 01:45:36,470 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:45:36,476 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:45:36,485 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/sv-benchmarks/c/nla-digbench/egcd3-ll.c[490,503] [2021-11-21 01:45:36,494 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:45:36,505 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:45:36,506 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:45:36 WrapperNode [2021-11-21 01:45:36,506 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:45:36,507 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:45:36,507 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:45:36,507 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:45:36,514 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:45:36" (1/1) ... [2021-11-21 01:45:36,521 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:45:36" (1/1) ... [2021-11-21 01:45:36,540 INFO L137 Inliner]: procedures = 14, calls = 14, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 78 [2021-11-21 01:45:36,540 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:45:36,541 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:45:36,541 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:45:36,542 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:45:36,550 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:45:36" (1/1) ... [2021-11-21 01:45:36,550 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:45:36" (1/1) ... [2021-11-21 01:45:36,566 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:45:36" (1/1) ... [2021-11-21 01:45:36,566 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:45:36" (1/1) ... [2021-11-21 01:45:36,570 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:45:36" (1/1) ... [2021-11-21 01:45:36,583 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:45:36" (1/1) ... [2021-11-21 01:45:36,584 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:45:36" (1/1) ... [2021-11-21 01:45:36,590 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:45:36,591 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:45:36,599 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:45:36,600 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:45:36,601 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:45:36" (1/1) ... [2021-11-21 01:45:36,611 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:45:36,621 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:45:36,633 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:45:36,659 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:45:36,684 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:45:36,685 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-21 01:45:36,685 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-21 01:45:36,685 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:45:36,685 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:45:36,686 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:45:36,686 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-21 01:45:36,686 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-21 01:45:36,755 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:45:36,757 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:45:36,954 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:45:36,975 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:45:36,987 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-21 01:45:36,990 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:45:36 BoogieIcfgContainer [2021-11-21 01:45:36,990 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:45:36,992 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:45:36,992 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:45:36,996 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:45:36,996 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:45:36" (1/3) ... [2021-11-21 01:45:36,997 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6de5323a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:45:36, skipping insertion in model container [2021-11-21 01:45:37,003 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:45:36" (2/3) ... [2021-11-21 01:45:37,004 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6de5323a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:45:37, skipping insertion in model container [2021-11-21 01:45:37,004 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:45:36" (3/3) ... [2021-11-21 01:45:37,005 INFO L111 eAbstractionObserver]: Analyzing ICFG egcd3-ll.c [2021-11-21 01:45:37,010 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:45:37,011 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:45:37,092 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:45:37,100 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 01:45:37,100 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:45:37,118 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 16 states have (on average 1.5) internal successors, (24), 17 states have internal predecessors, (24), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-21 01:45:37,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-21 01:45:37,124 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:45:37,124 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:45:37,125 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:45:37,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:45:37,131 INFO L85 PathProgramCache]: Analyzing trace with hash 1524023292, now seen corresponding path program 1 times [2021-11-21 01:45:37,140 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:45:37,141 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2079986621] [2021-11-21 01:45:37,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:45:37,142 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:45:37,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:45:37,344 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:45:37,344 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:45:37,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2079986621] [2021-11-21 01:45:37,346 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2079986621] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:45:37,346 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:45:37,346 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:45:37,349 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [509411884] [2021-11-21 01:45:37,349 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:45:37,354 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-21 01:45:37,354 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:45:37,392 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-21 01:45:37,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-21 01:45:37,396 INFO L87 Difference]: Start difference. First operand has 27 states, 16 states have (on average 1.5) internal successors, (24), 17 states have internal predecessors, (24), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-21 01:45:37,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:45:37,448 INFO L93 Difference]: Finished difference Result 48 states and 74 transitions. [2021-11-21 01:45:37,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-21 01:45:37,451 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 13 [2021-11-21 01:45:37,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:45:37,459 INFO L225 Difference]: With dead ends: 48 [2021-11-21 01:45:37,459 INFO L226 Difference]: Without dead ends: 25 [2021-11-21 01:45:37,463 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-21 01:45:37,467 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:45:37,469 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 31 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:45:37,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-21 01:45:37,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-11-21 01:45:37,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 16 states have internal predecessors, (19), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-21 01:45:37,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 32 transitions. [2021-11-21 01:45:37,522 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 32 transitions. Word has length 13 [2021-11-21 01:45:37,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:45:37,526 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 32 transitions. [2021-11-21 01:45:37,527 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-21 01:45:37,527 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 32 transitions. [2021-11-21 01:45:37,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-21 01:45:37,530 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:45:37,530 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:45:37,530 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:45:37,531 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:45:37,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:45:37,536 INFO L85 PathProgramCache]: Analyzing trace with hash 1500233354, now seen corresponding path program 1 times [2021-11-21 01:45:37,536 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:45:37,537 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1954767240] [2021-11-21 01:45:37,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:45:37,537 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:45:37,566 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:45:37,567 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1048413392] [2021-11-21 01:45:37,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:45:37,568 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:45:37,568 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:45:37,573 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:45:37,607 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:45:37,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:45:37,665 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 01:45:37,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:45:37,814 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:45:37,814 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:45:37,815 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:45:37,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1954767240] [2021-11-21 01:45:37,816 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:45:37,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1048413392] [2021-11-21 01:45:37,821 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1048413392] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:45:37,821 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:45:37,822 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:45:37,822 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [385785351] [2021-11-21 01:45:37,823 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:45:37,824 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:45:37,825 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:45:37,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:45:37,827 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:45:37,829 INFO L87 Difference]: Start difference. First operand 25 states and 32 transitions. Second operand has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-21 01:45:37,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:45:37,942 INFO L93 Difference]: Finished difference Result 44 states and 57 transitions. [2021-11-21 01:45:37,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:45:37,945 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2021-11-21 01:45:37,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:45:37,947 INFO L225 Difference]: With dead ends: 44 [2021-11-21 01:45:37,948 INFO L226 Difference]: Without dead ends: 37 [2021-11-21 01:45:37,949 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:45:37,953 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 29 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:45:37,954 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 86 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:45:37,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-21 01:45:37,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 27. [2021-11-21 01:45:37,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-21 01:45:37,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 34 transitions. [2021-11-21 01:45:37,974 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 34 transitions. Word has length 14 [2021-11-21 01:45:37,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:45:37,975 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 34 transitions. [2021-11-21 01:45:37,976 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-21 01:45:37,976 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2021-11-21 01:45:37,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-21 01:45:37,977 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:45:37,978 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:45:38,015 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-21 01:45:38,191 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:45:38,192 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:45:38,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:45:38,192 INFO L85 PathProgramCache]: Analyzing trace with hash -640281993, now seen corresponding path program 1 times [2021-11-21 01:45:38,193 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:45:38,193 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [321701305] [2021-11-21 01:45:38,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:45:38,193 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:45:38,210 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:45:38,213 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1965691355] [2021-11-21 01:45:38,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:45:38,214 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:45:38,214 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:45:38,215 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:45:38,238 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:45:38,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:45:38,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-21 01:45:38,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:45:38,593 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:45:38,593 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:45:38,593 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:45:38,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [321701305] [2021-11-21 01:45:38,594 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:45:38,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1965691355] [2021-11-21 01:45:38,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1965691355] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:45:38,594 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:45:38,594 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-21 01:45:38,595 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2029030579] [2021-11-21 01:45:38,595 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:45:38,595 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 01:45:38,595 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:45:38,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 01:45:38,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-21 01:45:38,596 INFO L87 Difference]: Start difference. First operand 27 states and 34 transitions. Second operand has 8 states, 6 states have (on average 2.0) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-21 01:45:38,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:45:38,693 INFO L93 Difference]: Finished difference Result 43 states and 55 transitions. [2021-11-21 01:45:38,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 01:45:38,694 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 2.0) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2021-11-21 01:45:38,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:45:38,695 INFO L225 Difference]: With dead ends: 43 [2021-11-21 01:45:38,695 INFO L226 Difference]: Without dead ends: 41 [2021-11-21 01:45:38,696 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:45:38,697 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 30 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:45:38,698 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 126 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:45:38,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-21 01:45:38,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 40. [2021-11-21 01:45:38,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 25 states have (on average 1.24) internal successors, (31), 26 states have internal predecessors, (31), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-21 01:45:38,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 52 transitions. [2021-11-21 01:45:38,709 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 52 transitions. Word has length 17 [2021-11-21 01:45:38,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:45:38,709 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 52 transitions. [2021-11-21 01:45:38,710 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 2.0) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-21 01:45:38,710 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 52 transitions. [2021-11-21 01:45:38,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-21 01:45:38,711 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:45:38,711 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:45:38,737 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:45:38,927 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:45:38,928 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:45:38,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:45:38,928 INFO L85 PathProgramCache]: Analyzing trace with hash -377003451, now seen corresponding path program 1 times [2021-11-21 01:45:38,929 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:45:38,929 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1857510531] [2021-11-21 01:45:38,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:45:38,929 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:45:38,957 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:45:38,957 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [232605306] [2021-11-21 01:45:38,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:45:38,958 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:45:38,958 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:45:38,959 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:45:38,979 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:45:39,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:45:39,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 01:45:39,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:45:39,139 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:45:39,139 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:45:39,276 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:45:39,276 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:45:39,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1857510531] [2021-11-21 01:45:39,277 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:45:39,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [232605306] [2021-11-21 01:45:39,277 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [232605306] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:45:39,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [814376040] [2021-11-21 01:45:39,294 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-21 01:45:39,295 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:45:39,299 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:45:39,304 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:45:39,305 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:45:42,242 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 49 for LOIs [2021-11-21 01:45:42,319 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:45:43,302 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [814376040] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:45:43,302 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:45:43,302 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [7, 7] total 15 [2021-11-21 01:45:43,303 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609490879] [2021-11-21 01:45:43,303 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:45:43,304 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-21 01:45:43,304 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:45:43,304 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-21 01:45:43,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2021-11-21 01:45:43,305 INFO L87 Difference]: Start difference. First operand 40 states and 52 transitions. Second operand has 10 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:45:43,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:45:43,546 INFO L93 Difference]: Finished difference Result 68 states and 92 transitions. [2021-11-21 01:45:43,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 01:45:43,546 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 19 [2021-11-21 01:45:43,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:45:43,548 INFO L225 Difference]: With dead ends: 68 [2021-11-21 01:45:43,548 INFO L226 Difference]: Without dead ends: 61 [2021-11-21 01:45:43,549 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 39 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2021-11-21 01:45:43,550 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 52 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:45:43,550 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 49 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:45:43,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-11-21 01:45:43,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 47. [2021-11-21 01:45:43,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 32 states have (on average 1.25) internal successors, (40), 33 states have internal predecessors, (40), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-21 01:45:43,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 61 transitions. [2021-11-21 01:45:43,567 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 61 transitions. Word has length 19 [2021-11-21 01:45:43,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:45:43,568 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 61 transitions. [2021-11-21 01:45:43,568 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:45:43,568 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 61 transitions. [2021-11-21 01:45:43,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-21 01:45:43,569 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:45:43,569 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:45:43,603 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-21 01:45:43,791 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2021-11-21 01:45:43,792 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:45:43,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:45:43,792 INFO L85 PathProgramCache]: Analyzing trace with hash 1954095958, now seen corresponding path program 1 times [2021-11-21 01:45:43,792 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:45:43,792 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [982754227] [2021-11-21 01:45:43,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:45:43,793 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:45:43,803 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:45:43,804 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [114469047] [2021-11-21 01:45:43,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:45:43,804 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:45:43,804 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:45:43,805 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:45:43,811 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:45:43,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:45:43,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-21 01:45:43,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:45:44,178 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:45:44,178 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:45:44,178 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:45:44,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [982754227] [2021-11-21 01:45:44,178 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:45:44,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [114469047] [2021-11-21 01:45:44,179 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [114469047] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:45:44,179 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:45:44,179 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-11-21 01:45:44,180 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [271201234] [2021-11-21 01:45:44,180 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:45:44,180 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-21 01:45:44,180 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:45:44,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-21 01:45:44,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-11-21 01:45:44,181 INFO L87 Difference]: Start difference. First operand 47 states and 61 transitions. Second operand has 10 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 01:45:44,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:45:44,396 INFO L93 Difference]: Finished difference Result 62 states and 80 transitions. [2021-11-21 01:45:44,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 01:45:44,398 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 22 [2021-11-21 01:45:44,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:45:44,400 INFO L225 Difference]: With dead ends: 62 [2021-11-21 01:45:44,400 INFO L226 Difference]: Without dead ends: 60 [2021-11-21 01:45:44,400 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=133, Unknown=0, NotChecked=0, Total=182 [2021-11-21 01:45:44,401 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 68 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 142 SdHoareTripleChecker+Invalid, 168 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:45:44,402 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 142 Invalid, 168 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 137 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:45:44,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-21 01:45:44,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 51. [2021-11-21 01:45:44,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 35 states have (on average 1.2285714285714286) internal successors, (43), 36 states have internal predecessors, (43), 11 states have call successors, (11), 4 states have call predecessors, (11), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-21 01:45:44,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 64 transitions. [2021-11-21 01:45:44,417 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 64 transitions. Word has length 22 [2021-11-21 01:45:44,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:45:44,418 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 64 transitions. [2021-11-21 01:45:44,418 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-21 01:45:44,418 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 64 transitions. [2021-11-21 01:45:44,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-21 01:45:44,419 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:45:44,419 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:45:44,456 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:45:44,639 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:45:44,640 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:45:44,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:45:44,640 INFO L85 PathProgramCache]: Analyzing trace with hash -632778532, now seen corresponding path program 1 times [2021-11-21 01:45:44,640 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:45:44,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [937708774] [2021-11-21 01:45:44,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:45:44,641 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:45:44,651 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:45:44,651 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [411834550] [2021-11-21 01:45:44,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:45:44,652 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:45:44,652 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:45:44,653 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:45:44,678 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:45:44,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:45:44,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-21 01:45:44,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:45:44,894 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:45:44,894 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:45:44,992 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:45:44,992 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:45:44,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [937708774] [2021-11-21 01:45:44,992 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:45:44,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [411834550] [2021-11-21 01:45:44,993 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [411834550] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:45:44,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1318977979] [2021-11-21 01:45:44,995 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-21 01:45:44,996 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:45:44,996 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:45:44,996 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:45:44,997 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:45:48,304 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2021-11-21 01:45:48,362 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 49 for LOIs [2021-11-21 01:45:48,452 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:45:49,804 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1318977979] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:45:49,804 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:45:49,804 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [8, 6] total 21 [2021-11-21 01:45:49,805 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493424345] [2021-11-21 01:45:49,805 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:45:49,805 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-21 01:45:49,805 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:45:49,806 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-21 01:45:49,806 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2021-11-21 01:45:49,806 INFO L87 Difference]: Start difference. First operand 51 states and 64 transitions. Second operand has 13 states, 10 states have (on average 1.3) internal successors, (13), 8 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:45:50,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:45:50,178 INFO L93 Difference]: Finished difference Result 93 states and 123 transitions. [2021-11-21 01:45:50,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-21 01:45:50,183 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 10 states have (on average 1.3) internal successors, (13), 8 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 22 [2021-11-21 01:45:50,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:45:50,185 INFO L225 Difference]: With dead ends: 93 [2021-11-21 01:45:50,185 INFO L226 Difference]: Without dead ends: 91 [2021-11-21 01:45:50,186 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 42 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2021-11-21 01:45:50,188 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 70 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 209 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:45:50,189 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 46 Invalid, 209 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 156 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:45:50,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-11-21 01:45:50,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 85. [2021-11-21 01:45:50,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 50 states have (on average 1.2) internal successors, (60), 53 states have internal predecessors, (60), 27 states have call successors, (27), 7 states have call predecessors, (27), 7 states have return successors, (26), 24 states have call predecessors, (26), 26 states have call successors, (26) [2021-11-21 01:45:50,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 113 transitions. [2021-11-21 01:45:50,218 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 113 transitions. Word has length 22 [2021-11-21 01:45:50,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:45:50,218 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 113 transitions. [2021-11-21 01:45:50,218 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 10 states have (on average 1.3) internal successors, (13), 8 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:45:50,218 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 113 transitions. [2021-11-21 01:45:50,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-21 01:45:50,220 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:45:50,221 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:45:50,246 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:45:50,431 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:45:50,432 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:45:50,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:45:50,432 INFO L85 PathProgramCache]: Analyzing trace with hash -143636076, now seen corresponding path program 1 times [2021-11-21 01:45:50,432 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:45:50,432 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1653841603] [2021-11-21 01:45:50,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:45:50,433 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:45:50,442 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:45:50,442 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1664393575] [2021-11-21 01:45:50,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:45:50,443 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:45:50,443 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:45:50,453 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:45:50,454 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:45:50,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:45:50,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-21 01:45:50,503 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:45:51,171 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-21 01:45:51,171 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:46:13,507 WARN L227 SmtUtils]: Spent 12.07s on a formula simplification that was a NOOP. DAG size: 72 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 01:46:13,510 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:46:13,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1653841603] [2021-11-21 01:46:13,510 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:46:13,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1664393575] [2021-11-21 01:46:13,510 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1664393575] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:46:13,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [693357021] [2021-11-21 01:46:13,513 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-21 01:46:13,513 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:46:13,514 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:46:13,514 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:46:13,514 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:46:57,400 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 14 for LOIs [2021-11-21 01:46:57,493 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 49 for LOIs [2021-11-21 01:46:57,572 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:47:13,281 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:47:13,281 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:47:13,282 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-11-21 01:47:13,282 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788999249] [2021-11-21 01:47:13,282 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 01:47:13,282 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-21 01:47:13,282 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:47:13,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-21 01:47:13,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=1319, Unknown=6, NotChecked=0, Total=1482 [2021-11-21 01:47:13,284 INFO L87 Difference]: Start difference. First operand 85 states and 113 transitions. Second operand has 13 states, 12 states have (on average 2.0) internal successors, (24), 12 states have internal predecessors, (24), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-21 01:47:13,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:47:13,854 INFO L93 Difference]: Finished difference Result 123 states and 163 transitions. [2021-11-21 01:47:13,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-21 01:47:13,855 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.0) internal successors, (24), 12 states have internal predecessors, (24), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 3 states have call successors, (6) Word has length 44 [2021-11-21 01:47:13,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:47:13,858 INFO L225 Difference]: With dead ends: 123 [2021-11-21 01:47:13,858 INFO L226 Difference]: Without dead ends: 120 [2021-11-21 01:47:13,860 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 75 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 505 ImplicationChecksByTransitivity, 31.8s TimeCoverageRelationStatistics Valid=189, Invalid=1611, Unknown=6, NotChecked=0, Total=1806 [2021-11-21 01:47:13,861 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 42 mSDsluCounter, 256 mSDsCounter, 0 mSdLazyCounter, 469 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 499 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 469 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:47:13,861 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 277 Invalid, 499 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 469 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:47:13,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-11-21 01:47:13,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 109. [2021-11-21 01:47:13,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 68 states have (on average 1.2058823529411764) internal successors, (82), 70 states have internal predecessors, (82), 31 states have call successors, (31), 9 states have call predecessors, (31), 9 states have return successors, (30), 29 states have call predecessors, (30), 30 states have call successors, (30) [2021-11-21 01:47:13,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 143 transitions. [2021-11-21 01:47:13,940 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 143 transitions. Word has length 44 [2021-11-21 01:47:13,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:47:13,942 INFO L470 AbstractCegarLoop]: Abstraction has 109 states and 143 transitions. [2021-11-21 01:47:13,943 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.0) internal successors, (24), 12 states have internal predecessors, (24), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-21 01:47:13,943 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 143 transitions. [2021-11-21 01:47:13,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-21 01:47:13,947 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:47:13,947 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:47:13,983 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 01:47:14,167 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:47:14,168 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:47:14,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:47:14,168 INFO L85 PathProgramCache]: Analyzing trace with hash 227774145, now seen corresponding path program 1 times [2021-11-21 01:47:14,168 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:47:14,169 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [624589229] [2021-11-21 01:47:14,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:47:14,169 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:47:14,178 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:47:14,178 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1590732920] [2021-11-21 01:47:14,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:47:14,178 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:47:14,178 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:47:14,182 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:47:14,183 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:47:14,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:47:14,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:47:14,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:47:14,310 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-21 01:47:14,310 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:47:14,310 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:47:14,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [624589229] [2021-11-21 01:47:14,311 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:47:14,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1590732920] [2021-11-21 01:47:14,311 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1590732920] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:47:14,311 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:47:14,311 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:47:14,311 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794258312] [2021-11-21 01:47:14,311 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:47:14,312 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:47:14,312 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:47:14,312 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:47:14,312 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:47:14,313 INFO L87 Difference]: Start difference. First operand 109 states and 143 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-21 01:47:14,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:47:14,394 INFO L93 Difference]: Finished difference Result 187 states and 255 transitions. [2021-11-21 01:47:14,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:47:14,395 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 47 [2021-11-21 01:47:14,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:47:14,397 INFO L225 Difference]: With dead ends: 187 [2021-11-21 01:47:14,397 INFO L226 Difference]: Without dead ends: 138 [2021-11-21 01:47:14,398 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:47:14,399 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 3 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:47:14,399 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 75 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:47:14,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-11-21 01:47:14,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 131. [2021-11-21 01:47:14,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 78 states have (on average 1.2179487179487178) internal successors, (95), 79 states have internal predecessors, (95), 43 states have call successors, (43), 9 states have call predecessors, (43), 9 states have return successors, (42), 42 states have call predecessors, (42), 42 states have call successors, (42) [2021-11-21 01:47:14,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 180 transitions. [2021-11-21 01:47:14,438 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 180 transitions. Word has length 47 [2021-11-21 01:47:14,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:47:14,439 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 180 transitions. [2021-11-21 01:47:14,439 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-21 01:47:14,439 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 180 transitions. [2021-11-21 01:47:14,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-21 01:47:14,442 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:47:14,442 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:47:14,481 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 01:47:14,667 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-21 01:47:14,668 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:47:14,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:47:14,668 INFO L85 PathProgramCache]: Analyzing trace with hash -1330500229, now seen corresponding path program 2 times [2021-11-21 01:47:14,668 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:47:14,669 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [804042300] [2021-11-21 01:47:14,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:47:14,669 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:47:14,678 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:47:14,678 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1625239857] [2021-11-21 01:47:14,678 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:47:14,679 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:47:14,679 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:47:14,680 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:47:14,690 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 01:47:14,726 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 01:47:14,727 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:47:14,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 01:47:14,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:47:14,828 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-21 01:47:14,828 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:47:14,828 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:47:14,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [804042300] [2021-11-21 01:47:14,828 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:47:14,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1625239857] [2021-11-21 01:47:14,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1625239857] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:47:14,829 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:47:14,829 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:47:14,829 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324961022] [2021-11-21 01:47:14,830 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:47:14,831 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:47:14,831 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:47:14,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:47:14,831 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:47:14,832 INFO L87 Difference]: Start difference. First operand 131 states and 180 transitions. Second operand has 5 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:47:14,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:47:14,942 INFO L93 Difference]: Finished difference Result 215 states and 307 transitions. [2021-11-21 01:47:14,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:47:14,943 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 49 [2021-11-21 01:47:14,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:47:14,945 INFO L225 Difference]: With dead ends: 215 [2021-11-21 01:47:14,945 INFO L226 Difference]: Without dead ends: 166 [2021-11-21 01:47:14,946 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:47:14,947 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 18 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 127 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:47:14,948 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 127 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:47:14,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2021-11-21 01:47:14,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 135. [2021-11-21 01:47:14,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 82 states have (on average 1.1951219512195121) internal successors, (98), 83 states have internal predecessors, (98), 43 states have call successors, (43), 9 states have call predecessors, (43), 9 states have return successors, (42), 42 states have call predecessors, (42), 42 states have call successors, (42) [2021-11-21 01:47:14,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 183 transitions. [2021-11-21 01:47:14,993 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 183 transitions. Word has length 49 [2021-11-21 01:47:14,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:47:14,997 INFO L470 AbstractCegarLoop]: Abstraction has 135 states and 183 transitions. [2021-11-21 01:47:14,997 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:47:14,997 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 183 transitions. [2021-11-21 01:47:15,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-21 01:47:15,006 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:47:15,006 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:47:15,051 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 01:47:15,221 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-21 01:47:15,221 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:47:15,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:47:15,222 INFO L85 PathProgramCache]: Analyzing trace with hash 601289743, now seen corresponding path program 3 times [2021-11-21 01:47:15,222 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:47:15,222 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [891154079] [2021-11-21 01:47:15,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:47:15,222 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:47:15,242 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:47:15,242 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1839283080] [2021-11-21 01:47:15,242 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:47:15,243 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:47:15,243 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:47:15,247 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:47:15,270 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 01:47:15,300 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:47:15,300 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:47:15,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 01:47:15,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:47:15,445 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 16 proven. 5 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-21 01:47:15,445 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:47:15,567 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 16 proven. 5 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-21 01:47:15,567 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:47:15,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [891154079] [2021-11-21 01:47:15,567 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:47:15,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1839283080] [2021-11-21 01:47:15,567 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1839283080] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:47:15,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1027437633] [2021-11-21 01:47:15,570 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-21 01:47:15,570 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:47:15,570 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:47:15,571 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:47:15,571 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:47:52,134 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 14 for LOIs [2021-11-21 01:47:52,201 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 49 for LOIs [2021-11-21 01:47:52,278 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:47:53,520 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:47:53,520 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:47:53,521 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2021-11-21 01:47:53,521 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [927339536] [2021-11-21 01:47:53,521 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:47:53,522 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 01:47:53,522 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:47:53,522 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 01:47:53,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=606, Unknown=0, NotChecked=0, Total=702 [2021-11-21 01:47:53,523 INFO L87 Difference]: Start difference. First operand 135 states and 183 transitions. Second operand has 8 states, 8 states have (on average 3.25) internal successors, (26), 8 states have internal predecessors, (26), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-21 01:47:53,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:47:53,936 INFO L93 Difference]: Finished difference Result 215 states and 304 transitions. [2021-11-21 01:47:53,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-21 01:47:53,939 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.25) internal successors, (26), 8 states have internal predecessors, (26), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 49 [2021-11-21 01:47:53,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:47:53,942 INFO L225 Difference]: With dead ends: 215 [2021-11-21 01:47:53,942 INFO L226 Difference]: Without dead ends: 208 [2021-11-21 01:47:53,943 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 293 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=176, Invalid=1230, Unknown=0, NotChecked=0, Total=1406 [2021-11-21 01:47:53,944 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 47 mSDsluCounter, 224 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 285 SdHoareTripleChecker+Invalid, 264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:47:53,944 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 285 Invalid, 264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 189 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:47:53,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-11-21 01:47:53,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 153. [2021-11-21 01:47:53,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 92 states have (on average 1.1956521739130435) internal successors, (110), 93 states have internal predecessors, (110), 51 states have call successors, (51), 9 states have call predecessors, (51), 9 states have return successors, (50), 50 states have call predecessors, (50), 50 states have call successors, (50) [2021-11-21 01:47:53,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 211 transitions. [2021-11-21 01:47:53,998 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 211 transitions. Word has length 49 [2021-11-21 01:47:53,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:47:53,998 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 211 transitions. [2021-11-21 01:47:53,999 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.25) internal successors, (26), 8 states have internal predecessors, (26), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-21 01:47:53,999 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 211 transitions. [2021-11-21 01:47:54,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-21 01:47:54,000 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:47:54,000 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:47:54,026 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 01:47:54,211 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:47:54,215 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:47:54,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:47:54,215 INFO L85 PathProgramCache]: Analyzing trace with hash 583515831, now seen corresponding path program 1 times [2021-11-21 01:47:54,215 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:47:54,215 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [966044731] [2021-11-21 01:47:54,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:47:54,216 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:47:54,229 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:47:54,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1803417560] [2021-11-21 01:47:54,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:47:54,241 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:47:54,241 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:47:54,241 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:47:54,243 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 01:47:54,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:47:54,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-21 01:47:54,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:47:54,480 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 15 proven. 5 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2021-11-21 01:47:54,480 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:47:54,623 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-21 01:47:54,623 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:47:54,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [966044731] [2021-11-21 01:47:54,623 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:47:54,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1803417560] [2021-11-21 01:47:54,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1803417560] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-21 01:47:54,623 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:47:54,623 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [9] total 10 [2021-11-21 01:47:54,624 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1336412947] [2021-11-21 01:47:54,624 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:47:54,624 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:47:54,624 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:47:54,624 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:47:54,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-21 01:47:54,625 INFO L87 Difference]: Start difference. First operand 153 states and 211 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 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) [2021-11-21 01:47:54,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:47:54,753 INFO L93 Difference]: Finished difference Result 167 states and 222 transitions. [2021-11-21 01:47:54,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:47:54,754 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 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 54 [2021-11-21 01:47:54,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:47:54,755 INFO L225 Difference]: With dead ends: 167 [2021-11-21 01:47:54,756 INFO L226 Difference]: Without dead ends: 165 [2021-11-21 01:47:54,756 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 96 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-21 01:47:54,757 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 9 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:47:54,757 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 90 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:47:54,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2021-11-21 01:47:54,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 165. [2021-11-21 01:47:54,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 101 states have (on average 1.1782178217821782) internal successors, (119), 102 states have internal predecessors, (119), 51 states have call successors, (51), 12 states have call predecessors, (51), 12 states have return successors, (50), 50 states have call predecessors, (50), 50 states have call successors, (50) [2021-11-21 01:47:54,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 220 transitions. [2021-11-21 01:47:54,813 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 220 transitions. Word has length 54 [2021-11-21 01:47:54,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:47:54,813 INFO L470 AbstractCegarLoop]: Abstraction has 165 states and 220 transitions. [2021-11-21 01:47:54,814 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 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) [2021-11-21 01:47:54,814 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 220 transitions. [2021-11-21 01:47:54,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-21 01:47:54,815 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:47:54,815 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:47:54,845 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 01:47:55,035 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:47:55,036 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:47:55,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:47:55,036 INFO L85 PathProgramCache]: Analyzing trace with hash -1948306734, now seen corresponding path program 2 times [2021-11-21 01:47:55,036 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:47:55,036 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [165190227] [2021-11-21 01:47:55,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:47:55,036 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:47:55,045 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:47:55,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1949750849] [2021-11-21 01:47:55,046 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:47:55,046 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:47:55,046 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:47:55,060 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:47:55,082 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 01:47:55,113 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 01:47:55,113 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:47:55,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-21 01:47:55,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:47:55,725 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 8 proven. 21 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-21 01:47:55,726 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:47:56,537 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 19 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-21 01:47:56,538 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:47:56,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [165190227] [2021-11-21 01:47:56,538 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:47:56,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1949750849] [2021-11-21 01:47:56,538 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1949750849] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:47:56,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [952385423] [2021-11-21 01:47:56,541 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-21 01:47:56,541 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:47:56,541 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:47:56,541 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:47:56,542 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:48:14,292 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2021-11-21 01:48:14,360 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 49 for LOIs [2021-11-21 01:48:14,426 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:48:15,964 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:48:15,964 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:48:15,964 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 22 [2021-11-21 01:48:15,964 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [655414378] [2021-11-21 01:48:15,964 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:48:15,965 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-21 01:48:15,965 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:48:15,965 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-21 01:48:15,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=1338, Unknown=0, NotChecked=0, Total=1560 [2021-11-21 01:48:15,966 INFO L87 Difference]: Start difference. First operand 165 states and 220 transitions. Second operand has 22 states, 22 states have (on average 2.272727272727273) internal successors, (50), 21 states have internal predecessors, (50), 5 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 01:48:26,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:48:26,280 INFO L93 Difference]: Finished difference Result 296 states and 407 transitions. [2021-11-21 01:48:26,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-21 01:48:26,281 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.272727272727273) internal successors, (50), 21 states have internal predecessors, (50), 5 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 52 [2021-11-21 01:48:26,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:48:26,283 INFO L225 Difference]: With dead ends: 296 [2021-11-21 01:48:26,283 INFO L226 Difference]: Without dead ends: 294 [2021-11-21 01:48:26,285 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 115 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 859 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=491, Invalid=2931, Unknown=0, NotChecked=0, Total=3422 [2021-11-21 01:48:26,286 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 156 mSDsluCounter, 367 mSDsCounter, 0 mSdLazyCounter, 611 mSolverCounterSat, 260 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 156 SdHoareTripleChecker+Valid, 413 SdHoareTripleChecker+Invalid, 871 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 260 IncrementalHoareTripleChecker+Valid, 611 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:48:26,286 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [156 Valid, 413 Invalid, 871 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [260 Valid, 611 Invalid, 0 Unknown, 0 Unchecked, 4.6s Time] [2021-11-21 01:48:26,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294 states. [2021-11-21 01:48:26,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294 to 227. [2021-11-21 01:48:26,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 140 states have (on average 1.1857142857142857) internal successors, (166), 141 states have internal predecessors, (166), 71 states have call successors, (71), 15 states have call predecessors, (71), 15 states have return successors, (70), 70 states have call predecessors, (70), 70 states have call successors, (70) [2021-11-21 01:48:26,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 307 transitions. [2021-11-21 01:48:26,356 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 307 transitions. Word has length 52 [2021-11-21 01:48:26,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:48:26,356 INFO L470 AbstractCegarLoop]: Abstraction has 227 states and 307 transitions. [2021-11-21 01:48:26,356 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.272727272727273) internal successors, (50), 21 states have internal predecessors, (50), 5 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 01:48:26,357 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 307 transitions. [2021-11-21 01:48:26,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-21 01:48:26,358 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:48:26,358 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:48:26,402 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 01:48:26,571 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-21 01:48:26,572 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:48:26,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:48:26,572 INFO L85 PathProgramCache]: Analyzing trace with hash 1501893325, now seen corresponding path program 3 times [2021-11-21 01:48:26,572 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:48:26,572 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1445982319] [2021-11-21 01:48:26,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:48:26,572 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:48:26,579 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:48:26,579 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1625097015] [2021-11-21 01:48:26,580 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:48:26,580 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:48:26,580 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:48:26,581 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:48:26,583 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 01:48:26,626 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:48:26,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:48:26,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 01:48:26,630 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:48:26,798 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 18 proven. 6 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2021-11-21 01:48:26,798 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:48:26,903 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-21 01:48:26,903 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:48:26,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1445982319] [2021-11-21 01:48:26,903 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:48:26,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1625097015] [2021-11-21 01:48:26,903 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1625097015] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-21 01:48:26,903 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:48:26,904 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 9 [2021-11-21 01:48:26,904 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1976608495] [2021-11-21 01:48:26,904 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:48:26,904 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:48:26,904 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:48:26,904 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:48:26,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:48:26,905 INFO L87 Difference]: Start difference. First operand 227 states and 307 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-21 01:48:26,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:48:26,996 INFO L93 Difference]: Finished difference Result 256 states and 350 transitions. [2021-11-21 01:48:26,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:48:26,997 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 57 [2021-11-21 01:48:26,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:48:26,999 INFO L225 Difference]: With dead ends: 256 [2021-11-21 01:48:26,999 INFO L226 Difference]: Without dead ends: 254 [2021-11-21 01:48:27,000 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 104 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-21 01:48:27,001 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 8 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:48:27,001 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 95 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:48:27,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2021-11-21 01:48:27,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 249. [2021-11-21 01:48:27,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 149 states have (on average 1.1946308724832215) internal successors, (178), 150 states have internal predecessors, (178), 83 states have call successors, (83), 16 states have call predecessors, (83), 16 states have return successors, (82), 82 states have call predecessors, (82), 82 states have call successors, (82) [2021-11-21 01:48:27,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 343 transitions. [2021-11-21 01:48:27,072 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 343 transitions. Word has length 57 [2021-11-21 01:48:27,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:48:27,072 INFO L470 AbstractCegarLoop]: Abstraction has 249 states and 343 transitions. [2021-11-21 01:48:27,072 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-21 01:48:27,073 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 343 transitions. [2021-11-21 01:48:27,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-21 01:48:27,073 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:48:27,073 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:48:27,094 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-21 01:48:27,274 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-21 01:48:27,274 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:48:27,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:48:27,275 INFO L85 PathProgramCache]: Analyzing trace with hash -697498661, now seen corresponding path program 4 times [2021-11-21 01:48:27,275 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:48:27,275 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1848396364] [2021-11-21 01:48:27,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:48:27,275 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:48:27,287 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:48:27,287 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [92734407] [2021-11-21 01:48:27,287 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:48:27,287 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:48:27,287 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:48:27,288 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:48:27,289 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 01:48:27,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:48:27,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-21 01:48:27,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:48:28,176 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 10 proven. 22 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-21 01:48:28,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:48:29,980 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 14 proven. 18 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-21 01:48:29,980 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:48:29,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1848396364] [2021-11-21 01:48:29,981 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:48:29,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [92734407] [2021-11-21 01:48:29,981 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [92734407] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:48:29,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [87607950] [2021-11-21 01:48:29,984 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-21 01:48:29,984 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:48:29,985 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:48:29,985 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:48:29,985 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:48:51,606 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2021-11-21 01:48:51,684 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 49 for LOIs [2021-11-21 01:48:51,742 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:48:55,976 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:48:55,976 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:48:55,976 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 23 [2021-11-21 01:48:55,976 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1106403988] [2021-11-21 01:48:55,977 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:48:55,977 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-21 01:48:55,977 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:48:55,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-21 01:48:55,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=1436, Unknown=0, NotChecked=0, Total=1640 [2021-11-21 01:48:55,979 INFO L87 Difference]: Start difference. First operand 249 states and 343 transitions. Second operand has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 22 states have internal predecessors, (51), 6 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2021-11-21 01:49:24,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:49:24,370 INFO L93 Difference]: Finished difference Result 350 states and 483 transitions. [2021-11-21 01:49:24,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-21 01:49:24,371 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 22 states have internal predecessors, (51), 6 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) Word has length 57 [2021-11-21 01:49:24,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:49:24,374 INFO L225 Difference]: With dead ends: 350 [2021-11-21 01:49:24,374 INFO L226 Difference]: Without dead ends: 348 [2021-11-21 01:49:24,376 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 129 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1319 ImplicationChecksByTransitivity, 21.2s TimeCoverageRelationStatistics Valid=636, Invalid=3786, Unknown=0, NotChecked=0, Total=4422 [2021-11-21 01:49:24,377 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 205 mSDsluCounter, 336 mSDsCounter, 0 mSdLazyCounter, 827 mSolverCounterSat, 439 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 205 SdHoareTripleChecker+Valid, 379 SdHoareTripleChecker+Invalid, 1266 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 439 IncrementalHoareTripleChecker+Valid, 827 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:49:24,377 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [205 Valid, 379 Invalid, 1266 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [439 Valid, 827 Invalid, 0 Unknown, 0 Unchecked, 13.0s Time] [2021-11-21 01:49:24,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2021-11-21 01:49:24,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 296. [2021-11-21 01:49:24,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 296 states, 177 states have (on average 1.192090395480226) internal successors, (211), 178 states have internal predecessors, (211), 99 states have call successors, (99), 19 states have call predecessors, (99), 19 states have return successors, (98), 98 states have call predecessors, (98), 98 states have call successors, (98) [2021-11-21 01:49:24,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 408 transitions. [2021-11-21 01:49:24,491 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 408 transitions. Word has length 57 [2021-11-21 01:49:24,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:49:24,491 INFO L470 AbstractCegarLoop]: Abstraction has 296 states and 408 transitions. [2021-11-21 01:49:24,492 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 22 states have internal predecessors, (51), 6 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2021-11-21 01:49:24,492 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 408 transitions. [2021-11-21 01:49:24,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-21 01:49:24,493 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:49:24,493 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 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] [2021-11-21 01:49:24,534 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-21 01:49:24,707 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:49:24,708 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:49:24,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:49:24,708 INFO L85 PathProgramCache]: Analyzing trace with hash 67703573, now seen corresponding path program 1 times [2021-11-21 01:49:24,708 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:49:24,708 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1919791634] [2021-11-21 01:49:24,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:49:24,709 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:49:24,714 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:49:24,714 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [509748693] [2021-11-21 01:49:24,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:49:24,714 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:49:24,715 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:49:24,716 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:49:24,724 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-21 01:49:24,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:49:24,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-21 01:49:24,780 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:49:25,585 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 30 proven. 17 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2021-11-21 01:49:25,585 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:49:31,755 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 30 proven. 17 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2021-11-21 01:49:31,755 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:49:31,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1919791634] [2021-11-21 01:49:31,755 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:49:31,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [509748693] [2021-11-21 01:49:31,756 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [509748693] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:49:31,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [346691622] [2021-11-21 01:49:31,758 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-21 01:49:31,758 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:49:31,759 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:49:31,759 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:49:31,759 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:49:58,945 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-21 01:49:59,003 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 49 for LOIs [2021-11-21 01:49:59,064 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:50:09,664 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:50:09,664 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:50:09,664 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15] total 24 [2021-11-21 01:50:09,664 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331213075] [2021-11-21 01:50:09,664 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:50:09,665 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-21 01:50:09,665 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:09,665 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-21 01:50:09,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=1522, Unknown=1, NotChecked=0, Total=1722 [2021-11-21 01:50:09,666 INFO L87 Difference]: Start difference. First operand 296 states and 408 transitions. Second operand has 24 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 23 states have internal predecessors, (43), 8 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (18), 6 states have call predecessors, (18), 6 states have call successors, (18) [2021-11-21 01:50:56,963 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:51:13,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:51:13,665 INFO L93 Difference]: Finished difference Result 514 states and 737 transitions. [2021-11-21 01:51:13,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-21 01:51:13,666 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 23 states have internal predecessors, (43), 8 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (18), 6 states have call predecessors, (18), 6 states have call successors, (18) Word has length 66 [2021-11-21 01:51:13,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:51:13,670 INFO L225 Difference]: With dead ends: 514 [2021-11-21 01:51:13,670 INFO L226 Difference]: Without dead ends: 506 [2021-11-21 01:51:13,675 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 154 SyntacticMatches, 2 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2340 ImplicationChecksByTransitivity, 64.9s TimeCoverageRelationStatistics Valid=1083, Invalid=6558, Unknown=15, NotChecked=0, Total=7656 [2021-11-21 01:51:13,677 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 181 mSDsluCounter, 548 mSDsCounter, 0 mSdLazyCounter, 1356 mSolverCounterSat, 457 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 181 SdHoareTripleChecker+Valid, 571 SdHoareTripleChecker+Invalid, 1814 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 457 IncrementalHoareTripleChecker+Valid, 1356 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:51:13,678 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [181 Valid, 571 Invalid, 1814 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [457 Valid, 1356 Invalid, 1 Unknown, 0 Unchecked, 10.5s Time] [2021-11-21 01:51:13,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 506 states. [2021-11-21 01:51:13,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 506 to 469. [2021-11-21 01:51:13,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 283 states have (on average 1.215547703180212) internal successors, (344), 284 states have internal predecessors, (344), 163 states have call successors, (163), 22 states have call predecessors, (163), 22 states have return successors, (162), 162 states have call predecessors, (162), 162 states have call successors, (162) [2021-11-21 01:51:13,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 669 transitions. [2021-11-21 01:51:13,926 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 669 transitions. Word has length 66 [2021-11-21 01:51:13,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:51:13,927 INFO L470 AbstractCegarLoop]: Abstraction has 469 states and 669 transitions. [2021-11-21 01:51:13,927 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 23 states have internal predecessors, (43), 8 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (18), 6 states have call predecessors, (18), 6 states have call successors, (18) [2021-11-21 01:51:13,927 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 669 transitions. [2021-11-21 01:51:13,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-21 01:51:13,929 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:51:13,929 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 5, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:51:13,954 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-21 01:51:14,139 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-21 01:51:14,140 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:51:14,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:51:14,140 INFO L85 PathProgramCache]: Analyzing trace with hash 1639756131, now seen corresponding path program 5 times [2021-11-21 01:51:14,140 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:51:14,140 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1714468969] [2021-11-21 01:51:14,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:51:14,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:51:14,147 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:51:14,147 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [918414355] [2021-11-21 01:51:14,147 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:51:14,148 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:51:14,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:51:14,149 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:51:14,153 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-21 01:51:14,199 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 01:51:14,199 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:51:14,200 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-21 01:51:14,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:51:15,036 INFO L134 CoverageAnalysis]: Checked inductivity of 168 backedges. 16 proven. 38 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2021-11-21 01:51:15,037 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:51:17,077 INFO L134 CoverageAnalysis]: Checked inductivity of 168 backedges. 16 proven. 38 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2021-11-21 01:51:17,077 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:51:17,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1714468969] [2021-11-21 01:51:17,077 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:51:17,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [918414355] [2021-11-21 01:51:17,077 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [918414355] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:51:17,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1403386645] [2021-11-21 01:51:17,079 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-21 01:51:17,079 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:51:17,080 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:51:17,080 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:51:17,080 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:51:51,119 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2021-11-21 01:51:51,183 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 49 for LOIs [2021-11-21 01:51:51,242 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:51:53,546 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:51:53,547 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:51:53,547 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 26 [2021-11-21 01:51:53,548 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256508028] [2021-11-21 01:51:53,548 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:51:53,548 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-21 01:51:53,548 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:51:53,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-21 01:51:53,549 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=1638, Unknown=0, NotChecked=0, Total=1892 [2021-11-21 01:51:53,549 INFO L87 Difference]: Start difference. First operand 469 states and 669 transitions. Second operand has 26 states, 26 states have (on average 2.3076923076923075) internal successors, (60), 25 states have internal predecessors, (60), 7 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 5 states have call predecessors, (18), 5 states have call successors, (18) [2021-11-21 01:52:09,509 WARN L227 SmtUtils]: Spent 7.56s on a formula simplification. DAG size of input: 66 DAG size of output: 49 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 01:53:01,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:53:01,681 INFO L93 Difference]: Finished difference Result 650 states and 934 transitions. [2021-11-21 01:53:01,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-21 01:53:01,683 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.3076923076923075) internal successors, (60), 25 states have internal predecessors, (60), 7 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 5 states have call predecessors, (18), 5 states have call successors, (18) Word has length 77 [2021-11-21 01:53:01,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:53:01,688 INFO L225 Difference]: With dead ends: 650 [2021-11-21 01:53:01,688 INFO L226 Difference]: Without dead ends: 648 [2021-11-21 01:53:01,691 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 186 SyntacticMatches, 1 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2642 ImplicationChecksByTransitivity, 54.8s TimeCoverageRelationStatistics Valid=1259, Invalid=6751, Unknown=0, NotChecked=0, Total=8010 [2021-11-21 01:53:01,692 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 403 mSDsluCounter, 566 mSDsCounter, 0 mSdLazyCounter, 1178 mSolverCounterSat, 647 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 403 SdHoareTripleChecker+Valid, 627 SdHoareTripleChecker+Invalid, 1825 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 647 IncrementalHoareTripleChecker+Valid, 1178 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:53:01,693 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [403 Valid, 627 Invalid, 1825 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [647 Valid, 1178 Invalid, 0 Unknown, 0 Unchecked, 17.2s Time] [2021-11-21 01:53:01,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 648 states. [2021-11-21 01:53:01,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 648 to 557. [2021-11-21 01:53:01,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 557 states, 334 states have (on average 1.218562874251497) internal successors, (407), 335 states have internal predecessors, (407), 199 states have call successors, (199), 23 states have call predecessors, (199), 23 states have return successors, (198), 198 states have call predecessors, (198), 198 states have call successors, (198) [2021-11-21 01:53:01,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 557 states to 557 states and 804 transitions. [2021-11-21 01:53:01,991 INFO L78 Accepts]: Start accepts. Automaton has 557 states and 804 transitions. Word has length 77 [2021-11-21 01:53:01,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:53:01,992 INFO L470 AbstractCegarLoop]: Abstraction has 557 states and 804 transitions. [2021-11-21 01:53:01,992 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.3076923076923075) internal successors, (60), 25 states have internal predecessors, (60), 7 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (18), 5 states have call predecessors, (18), 5 states have call successors, (18) [2021-11-21 01:53:01,992 INFO L276 IsEmpty]: Start isEmpty. Operand 557 states and 804 transitions. [2021-11-21 01:53:01,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-21 01:53:01,994 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:53:01,995 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:53:02,028 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-21 01:53:02,219 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-21 01:53:02,220 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:53:02,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:53:02,220 INFO L85 PathProgramCache]: Analyzing trace with hash 448820177, now seen corresponding path program 2 times [2021-11-21 01:53:02,220 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:53:02,220 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1063942382] [2021-11-21 01:53:02,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:53:02,220 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:53:02,227 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:53:02,232 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1459485313] [2021-11-21 01:53:02,232 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:53:02,232 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:53:02,232 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:53:02,233 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:53:02,234 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-21 01:53:02,292 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 01:53:02,293 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:53:02,294 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 64 conjunts are in the unsatisfiable core [2021-11-21 01:53:02,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:53:03,324 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 68 proven. 14 refuted. 0 times theorem prover too weak. 239 trivial. 0 not checked. [2021-11-21 01:53:03,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:53:07,532 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:53:07,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1063942382] [2021-11-21 01:53:07,532 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:53:07,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1459485313] [2021-11-21 01:53:07,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1459485313] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:53:07,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [772301153] [2021-11-21 01:53:07,535 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-21 01:53:07,535 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:53:07,535 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:53:07,535 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:53:07,536 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:53:42,604 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-21 01:53:42,674 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 49 for LOIs [2021-11-21 01:53:42,752 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:53:59,105 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:53:59,105 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:53:59,105 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-11-21 01:53:59,105 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1771307947] [2021-11-21 01:53:59,105 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 01:53:59,105 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-21 01:53:59,106 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:53:59,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-21 01:53:59,106 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=1388, Unknown=5, NotChecked=0, Total=1560 [2021-11-21 01:53:59,107 INFO L87 Difference]: Start difference. First operand 557 states and 804 transitions. Second operand has 15 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 4 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 4 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 01:54:02,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:54:02,422 INFO L93 Difference]: Finished difference Result 634 states and 910 transitions. [2021-11-21 01:54:02,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-21 01:54:02,423 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 4 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 4 states have call predecessors, (10), 3 states have call successors, (10) Word has length 93 [2021-11-21 01:54:02,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:54:02,427 INFO L225 Difference]: With dead ends: 634 [2021-11-21 01:54:02,427 INFO L226 Difference]: Without dead ends: 627 [2021-11-21 01:54:02,428 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 180 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 567 ImplicationChecksByTransitivity, 20.7s TimeCoverageRelationStatistics Valid=242, Invalid=2009, Unknown=5, NotChecked=0, Total=2256 [2021-11-21 01:54:02,429 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 80 mSDsluCounter, 301 mSDsCounter, 0 mSdLazyCounter, 628 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 322 SdHoareTripleChecker+Invalid, 718 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 628 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2021-11-21 01:54:02,429 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 322 Invalid, 718 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 628 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2021-11-21 01:54:02,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 627 states. [2021-11-21 01:54:02,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 627 to 609. [2021-11-21 01:54:02,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 609 states, 359 states have (on average 1.2200557103064067) internal successors, (438), 361 states have internal predecessors, (438), 223 states have call successors, (223), 26 states have call predecessors, (223), 26 states have return successors, (222), 221 states have call predecessors, (222), 222 states have call successors, (222) [2021-11-21 01:54:02,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 609 states to 609 states and 883 transitions. [2021-11-21 01:54:02,753 INFO L78 Accepts]: Start accepts. Automaton has 609 states and 883 transitions. Word has length 93 [2021-11-21 01:54:02,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:54:02,754 INFO L470 AbstractCegarLoop]: Abstraction has 609 states and 883 transitions. [2021-11-21 01:54:02,754 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 4 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 4 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 01:54:02,754 INFO L276 IsEmpty]: Start isEmpty. Operand 609 states and 883 transitions. [2021-11-21 01:54:02,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-21 01:54:02,758 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:54:02,758 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:54:02,795 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-21 01:54:02,979 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:54:02,980 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:54:02,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:54:02,980 INFO L85 PathProgramCache]: Analyzing trace with hash 276561641, now seen corresponding path program 3 times [2021-11-21 01:54:02,980 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:54:02,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1748775299] [2021-11-21 01:54:02,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:54:02,980 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:54:02,986 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:54:02,987 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1359550247] [2021-11-21 01:54:02,987 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:54:02,987 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:54:02,987 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:54:02,988 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:54:02,999 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-21 01:54:03,044 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:54:03,044 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:54:03,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 93 conjunts are in the unsatisfiable core [2021-11-21 01:54:03,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:54:04,305 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 68 proven. 90 refuted. 0 times theorem prover too weak. 170 trivial. 0 not checked. [2021-11-21 01:54:04,305 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:54:32,918 INFO L134 CoverageAnalysis]: Checked inductivity of 328 backedges. 87 proven. 67 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2021-11-21 01:54:32,918 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:54:32,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1748775299] [2021-11-21 01:54:32,919 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:54:32,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1359550247] [2021-11-21 01:54:32,919 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1359550247] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:54:32,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1875725096] [2021-11-21 01:54:32,921 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-21 01:54:32,921 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:54:32,921 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:54:32,922 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:54:32,922 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:54:54,832 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2021-11-21 01:54:54,903 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 49 for LOIs [2021-11-21 01:54:54,967 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:55:28,208 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:55:28,208 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:55:28,208 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 16] total 29 [2021-11-21 01:55:28,208 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1508318236] [2021-11-21 01:55:28,208 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:55:28,209 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-21 01:55:28,209 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:55:28,210 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-21 01:55:28,211 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=258, Invalid=1988, Unknown=10, NotChecked=0, Total=2256 [2021-11-21 01:55:28,211 INFO L87 Difference]: Start difference. First operand 609 states and 883 transitions. Second operand has 29 states, 25 states have (on average 2.4) internal successors, (60), 25 states have internal predecessors, (60), 12 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (26), 10 states have call predecessors, (26), 10 states have call successors, (26) [2021-11-21 01:55:33,811 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.91s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:55:50,627 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:55:55,994 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:56:30,054 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.35s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:56:37,297 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:56:38,437 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.13s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:57:04,007 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-21 01:57:09,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:57:09,107 INFO L93 Difference]: Finished difference Result 742 states and 1066 transitions. [2021-11-21 01:57:09,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-21 01:57:09,108 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 25 states have (on average 2.4) internal successors, (60), 25 states have internal predecessors, (60), 12 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (26), 10 states have call predecessors, (26), 10 states have call successors, (26) Word has length 96 [2021-11-21 01:57:09,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:57:09,115 INFO L225 Difference]: With dead ends: 742 [2021-11-21 01:57:09,116 INFO L226 Difference]: Without dead ends: 734 [2021-11-21 01:57:09,118 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 256 SyntacticMatches, 3 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1732 ImplicationChecksByTransitivity, 108.5s TimeCoverageRelationStatistics Valid=844, Invalid=5290, Unknown=28, NotChecked=0, Total=6162 [2021-11-21 01:57:09,119 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 269 mSDsluCounter, 534 mSDsCounter, 0 mSdLazyCounter, 2049 mSolverCounterSat, 606 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 26.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 281 SdHoareTripleChecker+Valid, 561 SdHoareTripleChecker+Invalid, 2660 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 606 IncrementalHoareTripleChecker+Valid, 2049 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 27.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:57:09,119 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [281 Valid, 561 Invalid, 2660 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [606 Valid, 2049 Invalid, 5 Unknown, 0 Unchecked, 27.2s Time] [2021-11-21 01:57:09,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 734 states. [2021-11-21 01:57:09,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 734 to 676. [2021-11-21 01:57:09,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 676 states, 398 states have (on average 1.2236180904522613) internal successors, (487), 399 states have internal predecessors, (487), 247 states have call successors, (247), 30 states have call predecessors, (247), 30 states have return successors, (246), 246 states have call predecessors, (246), 246 states have call successors, (246) [2021-11-21 01:57:09,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 676 states to 676 states and 980 transitions. [2021-11-21 01:57:09,452 INFO L78 Accepts]: Start accepts. Automaton has 676 states and 980 transitions. Word has length 96 [2021-11-21 01:57:09,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:57:09,452 INFO L470 AbstractCegarLoop]: Abstraction has 676 states and 980 transitions. [2021-11-21 01:57:09,453 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 25 states have (on average 2.4) internal successors, (60), 25 states have internal predecessors, (60), 12 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (26), 10 states have call predecessors, (26), 10 states have call successors, (26) [2021-11-21 01:57:09,453 INFO L276 IsEmpty]: Start isEmpty. Operand 676 states and 980 transitions. [2021-11-21 01:57:09,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-21 01:57:09,455 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:57:09,455 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:57:09,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-21 01:57:09,675 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-21 01:57:09,676 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:57:09,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:57:09,676 INFO L85 PathProgramCache]: Analyzing trace with hash -2060320742, now seen corresponding path program 4 times [2021-11-21 01:57:09,676 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:57:09,676 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1514788037] [2021-11-21 01:57:09,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:09,676 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:57:09,689 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:57:09,689 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1222026016] [2021-11-21 01:57:09,689 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:57:09,689 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:09,690 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:57:09,690 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:57:09,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-21 01:57:09,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:57:09,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 86 conjunts are in the unsatisfiable core [2021-11-21 01:57:09,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:57:11,191 INFO L134 CoverageAnalysis]: Checked inductivity of 344 backedges. 50 proven. 61 refuted. 0 times theorem prover too weak. 233 trivial. 0 not checked. [2021-11-21 01:57:11,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:57:13,687 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:57:13,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1514788037] [2021-11-21 01:57:13,687 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:57:13,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1222026016] [2021-11-21 01:57:13,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1222026016] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:57:13,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [174071584] [2021-11-21 01:57:13,690 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-21 01:57:13,690 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:57:13,690 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:57:13,691 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:57:13,691 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:57:35,582 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-21 01:57:35,645 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 49 for LOIs [2021-11-21 01:57:35,708 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:57:44,453 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:57:44,453 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:57:44,453 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2021-11-21 01:57:44,453 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570688537] [2021-11-21 01:57:44,453 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 01:57:44,454 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-21 01:57:44,454 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:57:44,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-21 01:57:44,455 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=1647, Unknown=1, NotChecked=0, Total=1806 [2021-11-21 01:57:44,455 INFO L87 Difference]: Start difference. First operand 676 states and 980 transitions. Second operand has 20 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 19 states have internal predecessors, (41), 6 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-11-21 01:57:46,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:57:46,705 INFO L93 Difference]: Finished difference Result 799 states and 1150 transitions. [2021-11-21 01:57:46,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-21 01:57:46,706 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 19 states have internal predecessors, (41), 6 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) Word has length 101 [2021-11-21 01:57:46,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:57:46,714 INFO L225 Difference]: With dead ends: 799 [2021-11-21 01:57:46,715 INFO L226 Difference]: Without dead ends: 796 [2021-11-21 01:57:46,716 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 181 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 624 ImplicationChecksByTransitivity, 11.9s TimeCoverageRelationStatistics Valid=239, Invalid=2730, Unknown=1, NotChecked=0, Total=2970 [2021-11-21 01:57:46,717 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 96 mSDsluCounter, 677 mSDsCounter, 0 mSdLazyCounter, 1369 mSolverCounterSat, 117 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 710 SdHoareTripleChecker+Invalid, 1486 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 117 IncrementalHoareTripleChecker+Valid, 1369 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:57:46,718 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [112 Valid, 710 Invalid, 1486 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [117 Valid, 1369 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-21 01:57:46,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 796 states. [2021-11-21 01:57:47,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 796 to 778. [2021-11-21 01:57:47,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 778 states, 453 states have (on average 1.2251655629139073) internal successors, (555), 454 states have internal predecessors, (555), 287 states have call successors, (287), 37 states have call predecessors, (287), 37 states have return successors, (286), 286 states have call predecessors, (286), 286 states have call successors, (286) [2021-11-21 01:57:47,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 778 states to 778 states and 1128 transitions. [2021-11-21 01:57:47,128 INFO L78 Accepts]: Start accepts. Automaton has 778 states and 1128 transitions. Word has length 101 [2021-11-21 01:57:47,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:57:47,128 INFO L470 AbstractCegarLoop]: Abstraction has 778 states and 1128 transitions. [2021-11-21 01:57:47,129 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 19 states have internal predecessors, (41), 6 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-11-21 01:57:47,129 INFO L276 IsEmpty]: Start isEmpty. Operand 778 states and 1128 transitions. [2021-11-21 01:57:47,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-21 01:57:47,132 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:57:47,132 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:57:47,160 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-21 01:57:47,347 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:47,348 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:57:47,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:57:47,348 INFO L85 PathProgramCache]: Analyzing trace with hash -1508635023, now seen corresponding path program 1 times [2021-11-21 01:57:47,348 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:57:47,348 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1338416778] [2021-11-21 01:57:47,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:47,349 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:57:47,356 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:57:47,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [825711107] [2021-11-21 01:57:47,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:47,357 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:47,357 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:57:47,358 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:57:47,369 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-21 01:57:47,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:57:47,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-21 01:57:47,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:57:47,776 INFO L134 CoverageAnalysis]: Checked inductivity of 439 backedges. 91 proven. 17 refuted. 0 times theorem prover too weak. 331 trivial. 0 not checked. [2021-11-21 01:57:47,776 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:57:48,021 INFO L134 CoverageAnalysis]: Checked inductivity of 439 backedges. 85 proven. 8 refuted. 0 times theorem prover too weak. 346 trivial. 0 not checked. [2021-11-21 01:57:48,021 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:57:48,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1338416778] [2021-11-21 01:57:48,021 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:57:48,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [825711107] [2021-11-21 01:57:48,021 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [825711107] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:57:48,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [131889669] [2021-11-21 01:57:48,023 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-21 01:57:48,023 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:57:48,023 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:57:48,023 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:57:48,024 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:58:12,290 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2021-11-21 01:58:12,347 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 49 for LOIs [2021-11-21 01:58:12,408 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:58:13,630 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:58:13,630 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:58:13,630 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 13 [2021-11-21 01:58:13,631 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933683449] [2021-11-21 01:58:13,631 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:58:13,631 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-21 01:58:13,632 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:58:13,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-21 01:58:13,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=749, Unknown=0, NotChecked=0, Total=870 [2021-11-21 01:58:13,633 INFO L87 Difference]: Start difference. First operand 778 states and 1128 transitions. Second operand has 13 states, 13 states have (on average 3.1538461538461537) internal successors, (41), 12 states have internal predecessors, (41), 5 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 7 states have call predecessors, (21), 5 states have call successors, (21) [2021-11-21 01:58:14,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:58:14,565 INFO L93 Difference]: Finished difference Result 1006 states and 1483 transitions. [2021-11-21 01:58:14,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 01:58:14,565 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.1538461538461537) internal successors, (41), 12 states have internal predecessors, (41), 5 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 7 states have call predecessors, (21), 5 states have call successors, (21) Word has length 104 [2021-11-21 01:58:14,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:58:14,571 INFO L225 Difference]: With dead ends: 1006 [2021-11-21 01:58:14,571 INFO L226 Difference]: Without dead ends: 1004 [2021-11-21 01:58:14,572 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 317 GetRequests, 283 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 330 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=159, Invalid=1031, Unknown=0, NotChecked=0, Total=1190 [2021-11-21 01:58:14,573 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 27 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 244 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 279 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 244 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:58:14,573 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 163 Invalid, 279 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 244 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:58:14,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1004 states. [2021-11-21 01:58:15,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1004 to 758. [2021-11-21 01:58:15,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 758 states, 446 states have (on average 1.2174887892376682) internal successors, (543), 447 states have internal predecessors, (543), 271 states have call successors, (271), 40 states have call predecessors, (271), 40 states have return successors, (270), 270 states have call predecessors, (270), 270 states have call successors, (270) [2021-11-21 01:58:15,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 758 states to 758 states and 1084 transitions. [2021-11-21 01:58:15,030 INFO L78 Accepts]: Start accepts. Automaton has 758 states and 1084 transitions. Word has length 104 [2021-11-21 01:58:15,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:58:15,035 INFO L470 AbstractCegarLoop]: Abstraction has 758 states and 1084 transitions. [2021-11-21 01:58:15,035 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 3.1538461538461537) internal successors, (41), 12 states have internal predecessors, (41), 5 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 7 states have call predecessors, (21), 5 states have call successors, (21) [2021-11-21 01:58:15,035 INFO L276 IsEmpty]: Start isEmpty. Operand 758 states and 1084 transitions. [2021-11-21 01:58:15,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-21 01:58:15,038 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:15,038 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:58:15,075 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-21 01:58:15,255 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:15,256 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:58:15,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:15,256 INFO L85 PathProgramCache]: Analyzing trace with hash 1852640491, now seen corresponding path program 2 times [2021-11-21 01:58:15,256 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:15,256 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [549734005] [2021-11-21 01:58:15,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:15,256 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:15,262 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:58:15,263 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1628583155] [2021-11-21 01:58:15,263 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:58:15,263 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:15,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:15,264 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:58:15,265 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3c500c30-83bf-49df-ba5f-598ea4b4ce7e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-21 01:58:15,336 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 01:58:15,337 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:58:15,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 85 conjunts are in the unsatisfiable core [2021-11-21 01:58:15,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:58:17,067 INFO L134 CoverageAnalysis]: Checked inductivity of 395 backedges. 90 proven. 57 refuted. 0 times theorem prover too weak. 248 trivial. 0 not checked. [2021-11-21 01:58:17,068 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:58:23,279 INFO L134 CoverageAnalysis]: Checked inductivity of 395 backedges. 91 proven. 56 refuted. 0 times theorem prover too weak. 248 trivial. 0 not checked. [2021-11-21 01:58:23,279 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:23,279 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [549734005] [2021-11-21 01:58:23,279 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:58:23,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1628583155] [2021-11-21 01:58:23,280 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1628583155] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:58:23,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1055942079] [2021-11-21 01:58:23,281 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-21 01:58:23,281 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:58:23,281 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:58:23,282 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:58:23,282 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:58:44,382 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2021-11-21 01:58:44,445 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 49 for LOIs [2021-11-21 01:58:44,505 INFO L180 IcfgInterpreter]: Interpretation finished