./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-patterns/array6_pattern.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_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/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_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-patterns/array6_pattern.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/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_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/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 81db346fb66b40514998cf838e858b3f0793fe5c74d5812efa60193ab54d6833 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:52:56,868 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:52:56,870 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:52:56,903 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:52:56,904 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:52:56,905 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:52:56,907 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:52:56,910 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:52:56,912 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:52:56,914 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:52:56,915 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:52:56,917 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:52:56,917 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:52:56,919 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:52:56,921 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:52:56,923 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:52:56,924 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:52:56,925 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:52:56,928 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:52:56,931 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:52:56,934 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:52:56,935 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:52:56,937 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:52:56,938 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:52:56,943 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:52:56,943 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:52:56,944 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:52:56,945 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:52:56,946 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:52:56,947 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:52:56,948 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:52:56,949 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:52:56,950 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:52:56,951 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:52:56,953 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:52:56,953 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:52:56,954 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:52:56,955 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:52:56,955 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:52:56,956 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:52:56,957 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:52:56,958 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:52:56,991 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:52:56,991 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:52:56,991 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:52:56,992 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:52:56,992 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:52:56,993 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:52:56,993 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:52:56,993 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:52:56,993 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:52:56,993 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:52:56,994 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:52:56,994 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:52:56,994 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:52:56,994 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:52:56,995 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:52:56,995 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:52:56,995 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:52:56,995 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:52:56,996 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:52:56,996 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:52:56,997 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:52:56,997 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:52:56,997 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:52:56,997 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:52:56,997 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:52:56,998 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:52:56,998 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:52:56,998 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:52:56,998 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:52:56,998 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:52:56,999 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:52:56,999 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:52:56,999 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:52:56,999 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:52:57,000 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:52:57,000 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:52:57,000 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:52:57,000 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:52:57,001 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:52:57,001 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:52:57,003 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:52:57,003 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_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 81db346fb66b40514998cf838e858b3f0793fe5c74d5812efa60193ab54d6833 [2021-11-21 01:52:57,295 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:52:57,328 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:52:57,330 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:52:57,332 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:52:57,333 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:52:57,335 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-patterns/array6_pattern.c [2021-11-21 01:52:57,410 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/bin/utaipan-TEXQjIfE4P/data/f50ff497e/4dc7d9eb4cce4b64a4a5fcdcc5f89881/FLAG9d50e1d7f [2021-11-21 01:52:57,889 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:52:57,891 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/sv-benchmarks/c/array-patterns/array6_pattern.c [2021-11-21 01:52:57,908 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/bin/utaipan-TEXQjIfE4P/data/f50ff497e/4dc7d9eb4cce4b64a4a5fcdcc5f89881/FLAG9d50e1d7f [2021-11-21 01:52:58,251 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/bin/utaipan-TEXQjIfE4P/data/f50ff497e/4dc7d9eb4cce4b64a4a5fcdcc5f89881 [2021-11-21 01:52:58,254 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:52:58,255 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:52:58,257 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:52:58,257 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:52:58,261 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:52:58,261 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:52:58" (1/1) ... [2021-11-21 01:52:58,263 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6862f4cb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:58, skipping insertion in model container [2021-11-21 01:52:58,263 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:52:58" (1/1) ... [2021-11-21 01:52:58,274 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:52:58,304 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:52:58,491 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_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/sv-benchmarks/c/array-patterns/array6_pattern.c[1356,1369] [2021-11-21 01:52:58,513 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:52:58,522 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:52:58,536 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_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/sv-benchmarks/c/array-patterns/array6_pattern.c[1356,1369] [2021-11-21 01:52:58,547 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:52:58,562 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:52:58,562 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:58 WrapperNode [2021-11-21 01:52:58,563 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:52:58,564 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:52:58,564 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:52:58,564 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:52:58,572 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:58" (1/1) ... [2021-11-21 01:52:58,580 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:58" (1/1) ... [2021-11-21 01:52:58,604 INFO L137 Inliner]: procedures = 16, calls = 26, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 84 [2021-11-21 01:52:58,604 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:52:58,605 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:52:58,605 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:52:58,605 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:52:58,614 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:58" (1/1) ... [2021-11-21 01:52:58,614 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:58" (1/1) ... [2021-11-21 01:52:58,617 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:58" (1/1) ... [2021-11-21 01:52:58,617 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:58" (1/1) ... [2021-11-21 01:52:58,625 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:58" (1/1) ... [2021-11-21 01:52:58,639 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:58" (1/1) ... [2021-11-21 01:52:58,640 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:58" (1/1) ... [2021-11-21 01:52:58,643 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:52:58,644 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:52:58,644 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:52:58,644 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:52:58,645 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:58" (1/1) ... [2021-11-21 01:52:58,665 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:52:58,677 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:52:58,691 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:52:58,713 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:52:58,758 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:52:58,759 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-21 01:52:58,759 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-21 01:52:58,759 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:52:58,760 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 01:52:58,760 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 01:52:58,760 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:52:58,761 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:52:58,761 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 01:52:58,761 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 01:52:58,848 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:52:58,850 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:52:59,023 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:52:59,050 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:52:59,050 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-21 01:52:59,053 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:52:59 BoogieIcfgContainer [2021-11-21 01:52:59,053 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:52:59,055 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:52:59,055 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:52:59,059 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:52:59,059 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:52:58" (1/3) ... [2021-11-21 01:52:59,060 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b5e3a52 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:52:59, skipping insertion in model container [2021-11-21 01:52:59,060 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:58" (2/3) ... [2021-11-21 01:52:59,060 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b5e3a52 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:52:59, skipping insertion in model container [2021-11-21 01:52:59,060 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:52:59" (3/3) ... [2021-11-21 01:52:59,062 INFO L111 eAbstractionObserver]: Analyzing ICFG array6_pattern.c [2021-11-21 01:52:59,068 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:52:59,068 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:52:59,135 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:52:59,159 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 01:52:59,159 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:52:59,177 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 12 states have (on average 1.5) internal successors, (18), 13 states have internal predecessors, (18), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:52:59,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-21 01:52:59,183 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:52:59,184 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:52:59,185 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:52:59,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:52:59,191 INFO L85 PathProgramCache]: Analyzing trace with hash 857550697, now seen corresponding path program 1 times [2021-11-21 01:52:59,201 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:52:59,202 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [488431520] [2021-11-21 01:52:59,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:52:59,203 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:52:59,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:52:59,441 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:52:59,442 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:52:59,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [488431520] [2021-11-21 01:52:59,444 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [488431520] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:52:59,446 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:52:59,446 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:52:59,448 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [708175952] [2021-11-21 01:52:59,449 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:52:59,454 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-21 01:52:59,454 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:52:59,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-21 01:52:59,518 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-21 01:52:59,520 INFO L87 Difference]: Start difference. First operand has 17 states, 12 states have (on average 1.5) internal successors, (18), 13 states have internal predecessors, (18), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-21 01:52:59,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:52:59,578 INFO L93 Difference]: Finished difference Result 24 states and 30 transitions. [2021-11-21 01:52:59,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-21 01:52:59,581 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-11-21 01:52:59,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:52:59,589 INFO L225 Difference]: With dead ends: 24 [2021-11-21 01:52:59,589 INFO L226 Difference]: Without dead ends: 15 [2021-11-21 01:52:59,593 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 01:52:59,597 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:52:59,598 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 13 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:52:59,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-21 01:52:59,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-11-21 01:52:59,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:52:59,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2021-11-21 01:52:59,636 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 11 [2021-11-21 01:52:59,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:52:59,637 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2021-11-21 01:52:59,638 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-21 01:52:59,638 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2021-11-21 01:52:59,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-21 01:52:59,639 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:52:59,640 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:52:59,640 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:52:59,640 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:52:59,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:52:59,642 INFO L85 PathProgramCache]: Analyzing trace with hash -1659101310, now seen corresponding path program 1 times [2021-11-21 01:52:59,642 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:52:59,642 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1454036876] [2021-11-21 01:52:59,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:52:59,643 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:52:59,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:52:59,758 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 01:52:59,759 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:52:59,759 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1454036876] [2021-11-21 01:52:59,760 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1454036876] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:52:59,761 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:52:59,761 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 01:52:59,761 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45180582] [2021-11-21 01:52:59,762 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:52:59,763 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:52:59,764 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:52:59,765 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:52:59,765 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:52:59,766 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:52:59,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:52:59,812 INFO L93 Difference]: Finished difference Result 19 states and 22 transitions. [2021-11-21 01:52:59,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:52:59,812 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 16 [2021-11-21 01:52:59,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:52:59,813 INFO L225 Difference]: With dead ends: 19 [2021-11-21 01:52:59,814 INFO L226 Difference]: Without dead ends: 16 [2021-11-21 01:52:59,814 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:52:59,816 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 3 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:52:59,817 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 28 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:52:59,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-21 01:52:59,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-11-21 01:52:59,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:52:59,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2021-11-21 01:52:59,824 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 16 [2021-11-21 01:52:59,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:52:59,824 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2021-11-21 01:52:59,825 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:52:59,825 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2021-11-21 01:52:59,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-21 01:52:59,826 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:52:59,826 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:52:59,826 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 01:52:59,827 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:52:59,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:52:59,828 INFO L85 PathProgramCache]: Analyzing trace with hash 107201699, now seen corresponding path program 1 times [2021-11-21 01:52:59,828 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:52:59,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1996413164] [2021-11-21 01:52:59,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:52:59,829 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:52:59,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:52:59,961 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:52:59,962 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:52:59,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1996413164] [2021-11-21 01:52:59,962 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1996413164] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:52:59,963 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:52:59,963 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:52:59,963 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510536074] [2021-11-21 01:52:59,963 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:52:59,964 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:52:59,964 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:52:59,964 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:52:59,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:52:59,965 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:53:00,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:53:00,003 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2021-11-21 01:53:00,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:53:00,004 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 17 [2021-11-21 01:53:00,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:53:00,005 INFO L225 Difference]: With dead ends: 29 [2021-11-21 01:53:00,005 INFO L226 Difference]: Without dead ends: 17 [2021-11-21 01:53:00,006 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:53:00,007 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 7 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:53:00,008 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 33 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:53:00,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-21 01:53:00,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-11-21 01:53:00,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:53:00,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2021-11-21 01:53:00,014 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 17 [2021-11-21 01:53:00,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:53:00,014 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2021-11-21 01:53:00,015 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:53:00,015 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2021-11-21 01:53:00,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-21 01:53:00,016 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:53:00,016 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:53:00,016 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-21 01:53:00,017 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:53:00,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:53:00,018 INFO L85 PathProgramCache]: Analyzing trace with hash 1924715561, now seen corresponding path program 1 times [2021-11-21 01:53:00,018 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:53:00,018 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1749864043] [2021-11-21 01:53:00,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:53:00,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:53:00,036 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:53:00,036 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1227784719] [2021-11-21 01:53:00,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:53:00,037 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:53:00,037 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:53:00,039 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:53:00,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:53:00,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:53:00,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 01:53:00,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:53:00,336 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:53:00,336 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:53:00,514 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:53:00,514 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:53:00,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1749864043] [2021-11-21 01:53:00,515 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:53:00,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1227784719] [2021-11-21 01:53:00,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1227784719] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:53:00,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [459797382] [2021-11-21 01:53:00,539 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 01:53:00,546 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:53:00,552 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:53:00,560 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:53:00,561 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:53:01,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:01,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:01,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:01,323 INFO L354 Elim1Store]: treesize reduction 170, result has 28.9 percent of original size [2021-11-21 01:53:01,324 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 67 treesize of output 127 [2021-11-21 01:53:01,431 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:01,449 INFO L354 Elim1Store]: treesize reduction 9, result has 47.1 percent of original size [2021-11-21 01:53:01,450 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 37 treesize of output 37 [2021-11-21 01:53:01,565 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:01,566 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:01,577 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 01:53:01,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 7 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 37 [2021-11-21 01:53:01,656 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:01,658 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:01,660 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:01,662 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:01,690 INFO L354 Elim1Store]: treesize reduction 16, result has 36.0 percent of original size [2021-11-21 01:53:01,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 9 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 38 treesize of output 36 [2021-11-21 01:53:01,811 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:01,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:01,818 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-21 01:53:01,819 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 7 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 25 [2021-11-21 01:53:01,870 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:01,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:01,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:01,874 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 25 [2021-11-21 01:53:01,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:01,999 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:02,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:02,082 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:53:02,082 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:53:02,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:02,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:02,293 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:02,295 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 55 [2021-11-21 01:53:02,530 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:02,531 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:02,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:02,540 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:02,545 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:02,547 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:02,548 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:02,551 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:02,552 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:02,616 INFO L354 Elim1Store]: treesize reduction 155, result has 14.8 percent of original size [2021-11-21 01:53:02,617 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 354 treesize of output 335 [2021-11-21 01:53:03,125 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:03,145 INFO L354 Elim1Store]: treesize reduction 21, result has 52.3 percent of original size [2021-11-21 01:53:03,145 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 58 treesize of output 40 [2021-11-21 01:53:03,692 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:03,693 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:03,698 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:03,700 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:03,701 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:03,702 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:03,702 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:03,703 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:03,706 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:03,707 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:03,709 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:03,710 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:03,711 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:03,712 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:03,713 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:03,714 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:03,733 INFO L354 Elim1Store]: treesize reduction 39, result has 25.0 percent of original size [2021-11-21 01:53:03,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 99 treesize of output 75 [2021-11-21 01:53:04,931 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 01:53:04,956 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:53:05,834 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:53:05,834 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:53:05,835 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2021-11-21 01:53:05,835 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163273373] [2021-11-21 01:53:05,835 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:53:05,836 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-21 01:53:05,836 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:53:05,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-21 01:53:05,837 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=389, Unknown=0, NotChecked=0, Total=462 [2021-11-21 01:53:05,838 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand has 9 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:53:06,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:53:06,054 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2021-11-21 01:53:06,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-21 01:53:06,055 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 18 [2021-11-21 01:53:06,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:53:06,059 INFO L225 Difference]: With dead ends: 49 [2021-11-21 01:53:06,059 INFO L226 Difference]: Without dead ends: 29 [2021-11-21 01:53:06,060 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 197 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=129, Invalid=741, Unknown=0, NotChecked=0, Total=870 [2021-11-21 01:53:06,062 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 39 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:53:06,062 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 43 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:53:06,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-11-21 01:53:06,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 19. [2021-11-21 01:53:06,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:53:06,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2021-11-21 01:53:06,073 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 18 [2021-11-21 01:53:06,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:53:06,073 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2021-11-21 01:53:06,074 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:53:06,074 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2021-11-21 01:53:06,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-21 01:53:06,075 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:53:06,075 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:53:06,115 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:53:06,275 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:53:06,276 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:53:06,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:53:06,277 INFO L85 PathProgramCache]: Analyzing trace with hash 1012202345, now seen corresponding path program 2 times [2021-11-21 01:53:06,277 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:53:06,277 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1044800386] [2021-11-21 01:53:06,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:53:06,277 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:53:06,290 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:53:06,290 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1787972579] [2021-11-21 01:53:06,290 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:53:06,290 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:53:06,290 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:53:06,291 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:53:06,311 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:53:06,355 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 01:53:06,355 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:53:06,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 01:53:06,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:53:06,427 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-21 01:53:06,428 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:53:06,550 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-21 01:53:06,550 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:53:06,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1044800386] [2021-11-21 01:53:06,550 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:53:06,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1787972579] [2021-11-21 01:53:06,551 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1787972579] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:53:06,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1065937499] [2021-11-21 01:53:06,554 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-21 01:53:06,554 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:53:06,555 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:53:06,555 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:53:06,555 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:53:06,921 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:06,922 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:06,925 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:07,090 INFO L354 Elim1Store]: treesize reduction 170, result has 28.9 percent of original size [2021-11-21 01:53:07,090 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 67 treesize of output 127 [2021-11-21 01:53:07,174 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 24 [2021-11-21 01:53:07,216 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:07,217 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:07,222 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-21 01:53:07,223 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 7 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 27 [2021-11-21 01:53:07,275 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:07,288 INFO L354 Elim1Store]: treesize reduction 13, result has 23.5 percent of original size [2021-11-21 01:53:07,288 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 35 treesize of output 31 [2021-11-21 01:53:07,346 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:07,347 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:07,349 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:07,350 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 27 [2021-11-21 01:53:07,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:07,392 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:07,396 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:07,398 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:07,413 INFO L354 Elim1Store]: treesize reduction 21, result has 16.0 percent of original size [2021-11-21 01:53:07,413 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 9 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 40 treesize of output 34 [2021-11-21 01:53:07,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:07,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:07,520 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-21 01:53:07,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 7 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 31 [2021-11-21 01:53:07,580 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 24 [2021-11-21 01:53:07,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:07,756 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:07,758 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:07,761 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:07,848 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:53:07,849 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:53:07,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:07,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:07,943 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:07,950 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 55 [2021-11-21 01:53:08,216 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:08,218 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:08,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:08,227 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:08,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:08,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:08,233 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:08,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:08,237 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:08,301 INFO L354 Elim1Store]: treesize reduction 155, result has 14.8 percent of original size [2021-11-21 01:53:08,301 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 354 treesize of output 335 [2021-11-21 01:53:08,937 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:08,961 INFO L354 Elim1Store]: treesize reduction 21, result has 52.3 percent of original size [2021-11-21 01:53:08,962 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 58 treesize of output 40 [2021-11-21 01:53:09,486 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:09,488 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:09,493 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:09,495 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:09,496 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:09,497 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:09,498 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:09,499 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:09,501 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:09,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:09,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:09,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:09,506 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:09,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:09,509 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:09,510 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:09,532 INFO L354 Elim1Store]: treesize reduction 39, result has 25.0 percent of original size [2021-11-21 01:53:09,532 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 99 treesize of output 75 [2021-11-21 01:53:10,614 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 01:53:10,636 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:53:11,567 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:53:11,567 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:53:11,568 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2021-11-21 01:53:11,568 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296332618] [2021-11-21 01:53:11,568 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:53:11,568 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-21 01:53:11,568 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:53:11,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-21 01:53:11,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=382, Unknown=0, NotChecked=0, Total=462 [2021-11-21 01:53:11,569 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 9 states, 8 states have (on average 2.375) internal successors, (19), 9 states have internal predecessors, (19), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-21 01:53:11,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:53:11,647 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2021-11-21 01:53:11,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 01:53:11,648 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.375) internal successors, (19), 9 states have internal predecessors, (19), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) Word has length 20 [2021-11-21 01:53:11,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:53:11,649 INFO L225 Difference]: With dead ends: 28 [2021-11-21 01:53:11,649 INFO L226 Difference]: Without dead ends: 25 [2021-11-21 01:53:11,650 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 143 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=92, Invalid=460, Unknown=0, NotChecked=0, Total=552 [2021-11-21 01:53:11,651 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 16 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:53:11,651 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 48 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:53:11,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-21 01:53:11,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-11-21 01:53:11,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 20 states have internal predecessors, (22), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 01:53:11,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2021-11-21 01:53:11,658 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 20 [2021-11-21 01:53:11,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:53:11,658 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2021-11-21 01:53:11,658 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.375) internal successors, (19), 9 states have internal predecessors, (19), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-21 01:53:11,659 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2021-11-21 01:53:11,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-21 01:53:11,659 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:53:11,660 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:53:11,697 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:53:11,860 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:53:11,861 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:53:11,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:53:11,861 INFO L85 PathProgramCache]: Analyzing trace with hash 2055356873, now seen corresponding path program 3 times [2021-11-21 01:53:11,861 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:53:11,861 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [430639552] [2021-11-21 01:53:11,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:53:11,862 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:53:11,873 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:53:11,873 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1525292910] [2021-11-21 01:53:11,873 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:53:11,874 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:53:11,874 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:53:11,875 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:53:11,891 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a5f17f2c-1e5f-4a35-ad39-ab5fa3b3d297/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:53:11,987 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:53:11,987 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:53:11,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-21 01:53:11,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:53:12,012 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 01:53:12,052 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 15 [2021-11-21 01:53:12,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:12,107 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:12,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:12,111 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 55 [2021-11-21 01:53:12,199 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:12,200 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:12,201 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:12,202 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:12,203 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:12,204 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:12,204 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:12,205 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:12,206 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:12,215 INFO L354 Elim1Store]: treesize reduction 35, result has 20.5 percent of original size [2021-11-21 01:53:12,215 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 68 treesize of output 65 [2021-11-21 01:53:12,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:12,756 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:12,756 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:12,759 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:12,760 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:12,760 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:13,916 INFO L354 Elim1Store]: treesize reduction 4498, result has 5.1 percent of original size [2021-11-21 01:53:13,916 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 4 stores, 10 select indices, 10 select index equivalence classes, 3 disjoint index pairs (out of 45 index pairs), introduced 14 new quantified variables, introduced 89 case distinctions, treesize of input 589 treesize of output 447 [2021-11-21 01:53:14,004 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:53:14,056 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:14,058 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:14,059 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:14,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:14,062 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:14,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:14,065 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:14,067 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:14,067 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:14,068 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:14,069 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:14,074 INFO L354 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2021-11-21 01:53:14,075 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 5 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 191 treesize of output 132 [2021-11-21 01:53:14,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:14,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:14,120 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:14,121 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:14,121 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:14,123 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:14,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:14,125 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:14,127 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 7 disjoint index pairs (out of 21 index pairs), introduced 6 new quantified variables, introduced 0 case distinctions, treesize of input 325 treesize of output 230 [2021-11-21 01:53:14,167 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:14,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:14,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:14,171 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:14,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:14,173 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:14,174 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:14,175 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:14,176 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:14,176 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:14,177 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:14,178 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:53:14,179 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:14,180 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:53:14,184 INFO L354 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2021-11-21 01:53:14,185 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 4 disjoint index pairs (out of 28 index pairs), introduced 6 new quantified variables, introduced 16 case distinctions, treesize of input 237 treesize of output 133 [2021-11-21 01:53:14,705 INFO L354 Elim1Store]: treesize reduction 291, result has 4.6 percent of original size [2021-11-21 01:53:14,705 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 3 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 36 case distinctions, treesize of input 116 treesize of output 51 [2021-11-21 01:53:14,757 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:53:14,757 INFO L328 TraceCheckSpWp]: Computing backward predicates...