./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-industry-pattern/array_shadowinit.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-industry-pattern/array_shadowinit.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh --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 03931b69e9073178e54f20b91a2b2a66154a89c69758aa4d312927278c5c0104 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-2329fc7 [2022-12-14 09:36:51,968 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 09:36:51,970 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 09:36:51,990 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 09:36:51,990 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 09:36:51,991 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 09:36:51,992 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 09:36:51,994 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 09:36:51,995 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 09:36:51,996 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 09:36:51,997 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 09:36:51,998 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 09:36:51,999 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 09:36:52,000 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 09:36:52,001 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 09:36:52,002 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 09:36:52,003 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 09:36:52,004 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 09:36:52,005 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 09:36:52,007 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 09:36:52,008 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 09:36:52,009 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 09:36:52,011 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 09:36:52,011 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 09:36:52,015 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 09:36:52,015 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 09:36:52,015 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 09:36:52,016 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 09:36:52,017 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 09:36:52,018 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 09:36:52,018 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 09:36:52,018 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 09:36:52,019 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 09:36:52,020 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 09:36:52,021 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 09:36:52,021 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 09:36:52,022 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 09:36:52,022 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 09:36:52,022 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 09:36:52,023 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 09:36:52,023 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 09:36:52,024 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 09:36:52,049 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 09:36:52,050 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 09:36:52,050 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 09:36:52,050 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 09:36:52,051 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 09:36:52,051 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 09:36:52,051 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 09:36:52,059 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 09:36:52,059 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 09:36:52,059 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 09:36:52,060 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 09:36:52,060 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 09:36:52,060 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 09:36:52,060 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 09:36:52,060 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 09:36:52,060 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 09:36:52,061 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 09:36:52,061 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 09:36:52,061 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 09:36:52,062 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 09:36:52,062 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 09:36:52,062 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 09:36:52,062 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 09:36:52,062 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 09:36:52,062 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 09:36:52,062 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 09:36:52,063 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 09:36:52,063 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 09:36:52,063 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 09:36:52,063 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 09:36:52,063 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 09:36:52,063 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 09:36:52,064 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 09:36:52,064 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 09:36:52,064 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 09:36:52,064 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 09:36:52,064 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 09:36:52,064 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 09:36:52,065 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 09:36:52,065 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 09:36:52,065 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 09:36:52,065 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 03931b69e9073178e54f20b91a2b2a66154a89c69758aa4d312927278c5c0104 [2022-12-14 09:36:52,254 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 09:36:52,269 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 09:36:52,272 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 09:36:52,272 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 09:36:52,273 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 09:36:52,274 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/array-industry-pattern/array_shadowinit.i [2022-12-14 09:36:54,936 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 09:36:55,113 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 09:36:55,113 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/sv-benchmarks/c/array-industry-pattern/array_shadowinit.i [2022-12-14 09:36:55,119 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/data/21c9be3da/a1dcbe34167148b98555ba53531092c5/FLAG5446de8ad [2022-12-14 09:36:55,131 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/data/21c9be3da/a1dcbe34167148b98555ba53531092c5 [2022-12-14 09:36:55,134 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 09:36:55,135 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 09:36:55,136 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 09:36:55,137 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 09:36:55,139 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 09:36:55,140 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 09:36:55" (1/1) ... [2022-12-14 09:36:55,141 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6ac95f6b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 09:36:55, skipping insertion in model container [2022-12-14 09:36:55,141 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 09:36:55" (1/1) ... [2022-12-14 09:36:55,146 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 09:36:55,159 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 09:36:55,272 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/sv-benchmarks/c/array-industry-pattern/array_shadowinit.i[809,822] [2022-12-14 09:36:55,283 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 09:36:55,290 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 09:36:55,299 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/sv-benchmarks/c/array-industry-pattern/array_shadowinit.i[809,822] [2022-12-14 09:36:55,304 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 09:36:55,314 INFO L208 MainTranslator]: Completed translation [2022-12-14 09:36:55,314 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 09:36:55 WrapperNode [2022-12-14 09:36:55,314 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 09:36:55,315 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 09:36:55,315 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 09:36:55,315 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 09:36:55,321 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 09:36:55" (1/1) ... [2022-12-14 09:36:55,326 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 09:36:55" (1/1) ... [2022-12-14 09:36:55,338 INFO L138 Inliner]: procedures = 16, calls = 11, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 44 [2022-12-14 09:36:55,338 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 09:36:55,339 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 09:36:55,339 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 09:36:55,339 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 09:36:55,345 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 09:36:55" (1/1) ... [2022-12-14 09:36:55,346 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 09:36:55" (1/1) ... [2022-12-14 09:36:55,347 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 09:36:55" (1/1) ... [2022-12-14 09:36:55,347 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 09:36:55" (1/1) ... [2022-12-14 09:36:55,351 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 09:36:55" (1/1) ... [2022-12-14 09:36:55,354 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 09:36:55" (1/1) ... [2022-12-14 09:36:55,355 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 09:36:55" (1/1) ... [2022-12-14 09:36:55,356 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 09:36:55" (1/1) ... [2022-12-14 09:36:55,357 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 09:36:55,358 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 09:36:55,358 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 09:36:55,358 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 09:36:55,359 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 09:36:55" (1/1) ... [2022-12-14 09:36:55,365 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 09:36:55,374 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:36:55,384 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 09:36:55,386 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 09:36:55,418 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 09:36:55,418 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 09:36:55,418 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-12-14 09:36:55,418 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-12-14 09:36:55,418 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 09:36:55,418 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 09:36:55,418 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-12-14 09:36:55,419 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-12-14 09:36:55,476 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 09:36:55,477 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 09:36:55,551 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 09:36:55,567 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 09:36:55,567 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-12-14 09:36:55,569 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 09:36:55 BoogieIcfgContainer [2022-12-14 09:36:55,569 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 09:36:55,571 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 09:36:55,571 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 09:36:55,573 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 09:36:55,573 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 09:36:55" (1/3) ... [2022-12-14 09:36:55,574 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c339241 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 09:36:55, skipping insertion in model container [2022-12-14 09:36:55,574 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 09:36:55" (2/3) ... [2022-12-14 09:36:55,574 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c339241 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 09:36:55, skipping insertion in model container [2022-12-14 09:36:55,574 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 09:36:55" (3/3) ... [2022-12-14 09:36:55,575 INFO L112 eAbstractionObserver]: Analyzing ICFG array_shadowinit.i [2022-12-14 09:36:55,589 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 09:36:55,590 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 09:36:55,623 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 09:36:55,627 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@50bfa88f, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 09:36:55,628 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 09:36:55,631 INFO L276 IsEmpty]: Start isEmpty. Operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:36:55,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-12-14 09:36:55,635 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:36:55,635 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-12-14 09:36:55,636 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:36:55,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:36:55,640 INFO L85 PathProgramCache]: Analyzing trace with hash -1969782628, now seen corresponding path program 1 times [2022-12-14 09:36:55,646 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:36:55,647 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1970993982] [2022-12-14 09:36:55,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:36:55,647 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:36:55,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:36:55,800 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:36:55,800 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:36:55,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1970993982] [2022-12-14 09:36:55,801 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1970993982] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 09:36:55,801 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 09:36:55,802 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 09:36:55,803 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913602283] [2022-12-14 09:36:55,803 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 09:36:55,807 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 09:36:55,807 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:36:55,828 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 09:36:55,829 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 09:36:55,830 INFO L87 Difference]: Start difference. First operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:36:55,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:36:55,859 INFO L93 Difference]: Finished difference Result 18 states and 23 transitions. [2022-12-14 09:36:55,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 09:36:55,861 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-12-14 09:36:55,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:36:55,867 INFO L225 Difference]: With dead ends: 18 [2022-12-14 09:36:55,867 INFO L226 Difference]: Without dead ends: 9 [2022-12-14 09:36:55,869 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 09:36:55,871 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 09:36:55,872 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 09:36:55,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2022-12-14 09:36:55,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2022-12-14 09:36:55,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:36:55,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2022-12-14 09:36:55,893 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 6 [2022-12-14 09:36:55,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:36:55,894 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2022-12-14 09:36:55,894 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:36:55,894 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2022-12-14 09:36:55,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-12-14 09:36:55,894 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:36:55,894 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-12-14 09:36:55,895 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 09:36:55,895 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:36:55,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:36:55,895 INFO L85 PathProgramCache]: Analyzing trace with hash -968964990, now seen corresponding path program 1 times [2022-12-14 09:36:55,896 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:36:55,896 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [885413873] [2022-12-14 09:36:55,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:36:55,896 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:36:55,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:36:56,157 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:36:56,157 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:36:56,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [885413873] [2022-12-14 09:36:56,158 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [885413873] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:36:56,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1649055631] [2022-12-14 09:36:56,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:36:56,158 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:36:56,158 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:36:56,160 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:36:56,161 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 09:36:56,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:36:56,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 09:36:56,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:36:56,256 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 11 treesize of output 7 [2022-12-14 09:36:56,296 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:36:56,296 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:36:56,329 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 14 treesize of output 12 [2022-12-14 09:36:56,333 INFO L350 Elim1Store]: Elim1 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 22 treesize of output 20 [2022-12-14 09:36:56,348 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:36:56,349 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1649055631] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:36:56,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1016470051] [2022-12-14 09:36:56,367 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-12-14 09:36:56,367 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:36:56,371 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:36:56,377 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:36:56,377 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:36:56,414 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:36:56,428 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:36:56,429 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:36:56,441 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:36:56,458 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:36:56,458 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:36:56,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:36:56,486 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:36:56,556 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:36:56,559 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:36:56,572 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:36:56,573 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:36:56,627 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:36:56,644 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:36:56,837 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '98#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:36:56,837 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:36:56,837 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:36:56,837 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2022-12-14 09:36:56,838 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802016676] [2022-12-14 09:36:56,838 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:36:56,839 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-12-14 09:36:56,839 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:36:56,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-12-14 09:36:56,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2022-12-14 09:36:56,840 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand has 10 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:36:56,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:36:56,909 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2022-12-14 09:36:56,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 09:36:56,909 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-12-14 09:36:56,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:36:56,910 INFO L225 Difference]: With dead ends: 15 [2022-12-14 09:36:56,910 INFO L226 Difference]: Without dead ends: 13 [2022-12-14 09:36:56,911 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2022-12-14 09:36:56,912 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 25 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 09:36:56,913 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 13 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 09:36:56,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-12-14 09:36:56,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 11. [2022-12-14 09:36:56,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:36:56,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2022-12-14 09:36:56,916 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 7 [2022-12-14 09:36:56,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:36:56,916 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2022-12-14 09:36:56,917 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:36:56,917 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2022-12-14 09:36:56,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-12-14 09:36:56,917 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:36:56,917 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 09:36:56,924 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 09:36:57,118 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:36:57,119 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:36:57,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:36:57,121 INFO L85 PathProgramCache]: Analyzing trace with hash 43972795, now seen corresponding path program 1 times [2022-12-14 09:36:57,122 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:36:57,123 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [762850518] [2022-12-14 09:36:57,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:36:57,124 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:36:57,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:36:57,295 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:36:57,295 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:36:57,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [762850518] [2022-12-14 09:36:57,295 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [762850518] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:36:57,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [469828853] [2022-12-14 09:36:57,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:36:57,296 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:36:57,296 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:36:57,297 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:36:57,298 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 09:36:57,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:36:57,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 6 conjunts are in the unsatisfiable core [2022-12-14 09:36:57,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:36:57,373 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:36:57,373 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:36:57,399 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:36:57,400 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [469828853] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:36:57,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [649107772] [2022-12-14 09:36:57,402 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:36:57,402 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:36:57,402 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:36:57,403 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:36:57,403 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:36:57,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:36:57,429 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:36:57,429 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:36:57,438 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:36:57,439 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:36:57,455 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:36:57,456 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:36:57,493 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:36:57,495 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:36:57,507 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:36:57,508 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:36:57,556 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:36:57,604 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:36:57,827 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '208#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:36:57,828 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:36:57,828 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:36:57,828 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2022-12-14 09:36:57,828 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235604327] [2022-12-14 09:36:57,828 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:36:57,828 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-12-14 09:36:57,829 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:36:57,829 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-12-14 09:36:57,829 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2022-12-14 09:36:57,830 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand has 10 states, 10 states have (on average 2.1) internal successors, (21), 10 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:36:57,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:36:57,861 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2022-12-14 09:36:57,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 09:36:57,861 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 10 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-12-14 09:36:57,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:36:57,862 INFO L225 Difference]: With dead ends: 27 [2022-12-14 09:36:57,862 INFO L226 Difference]: Without dead ends: 18 [2022-12-14 09:36:57,862 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 16 SyntacticMatches, 5 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2022-12-14 09:36:57,863 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 6 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 09:36:57,863 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 17 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 09:36:57,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-12-14 09:36:57,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 12. [2022-12-14 09:36:57,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:36:57,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2022-12-14 09:36:57,866 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 10 [2022-12-14 09:36:57,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:36:57,866 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2022-12-14 09:36:57,866 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 10 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:36:57,866 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2022-12-14 09:36:57,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-12-14 09:36:57,866 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:36:57,866 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 09:36:57,871 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 09:36:58,067 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:36:58,067 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:36:58,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:36:58,068 INFO L85 PathProgramCache]: Analyzing trace with hash -812263007, now seen corresponding path program 2 times [2022-12-14 09:36:58,068 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:36:58,068 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1757432147] [2022-12-14 09:36:58,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:36:58,068 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:36:58,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:36:58,264 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:36:58,265 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:36:58,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1757432147] [2022-12-14 09:36:58,265 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1757432147] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:36:58,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [320723547] [2022-12-14 09:36:58,265 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:36:58,265 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:36:58,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:36:58,266 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:36:58,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 09:36:58,304 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 09:36:58,304 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:36:58,305 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 22 conjunts are in the unsatisfiable core [2022-12-14 09:36:58,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:36:58,330 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 09:36:58,408 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:36:58,409 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:36:58,450 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:36:58,452 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:36:58,457 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:36:58,459 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:36:58,468 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:36:58,468 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [320723547] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:36:58,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [261847592] [2022-12-14 09:36:58,470 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:36:58,470 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:36:58,470 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:36:58,471 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:36:58,471 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:36:58,483 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:36:58,496 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:36:58,496 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:36:58,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:36:58,506 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:36:58,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:36:58,521 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-12-14 09:36:58,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:36:58,553 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 09:36:58,573 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-12-14 09:36:58,573 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 202 [2022-12-14 09:36:58,624 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:36:58,662 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:36:58,886 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '343#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:36:58,886 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:36:58,886 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:36:58,886 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2022-12-14 09:36:58,886 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1870653210] [2022-12-14 09:36:58,886 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:36:58,887 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-12-14 09:36:58,887 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:36:58,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-12-14 09:36:58,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=322, Unknown=0, NotChecked=0, Total=380 [2022-12-14 09:36:58,888 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand has 15 states, 15 states have (on average 1.6) internal successors, (24), 15 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:36:59,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:36:59,003 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2022-12-14 09:36:59,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-12-14 09:36:59,003 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.6) internal successors, (24), 15 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-12-14 09:36:59,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:36:59,003 INFO L225 Difference]: With dead ends: 19 [2022-12-14 09:36:59,003 INFO L226 Difference]: Without dead ends: 17 [2022-12-14 09:36:59,004 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 18 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2022-12-14 09:36:59,004 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 15 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 09:36:59,004 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 27 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 09:36:59,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-12-14 09:36:59,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 15. [2022-12-14 09:36:59,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:36:59,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2022-12-14 09:36:59,007 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2022-12-14 09:36:59,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:36:59,007 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2022-12-14 09:36:59,007 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.6) internal successors, (24), 15 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:36:59,007 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2022-12-14 09:36:59,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-12-14 09:36:59,007 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:36:59,007 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1] [2022-12-14 09:36:59,012 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-12-14 09:36:59,208 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:36:59,209 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:36:59,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:36:59,211 INFO L85 PathProgramCache]: Analyzing trace with hash -276702404, now seen corresponding path program 3 times [2022-12-14 09:36:59,211 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:36:59,211 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1316042683] [2022-12-14 09:36:59,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:36:59,212 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:36:59,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:36:59,382 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:36:59,382 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:36:59,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1316042683] [2022-12-14 09:36:59,382 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1316042683] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:36:59,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [605141277] [2022-12-14 09:36:59,382 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:36:59,383 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:36:59,383 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:36:59,384 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:36:59,384 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 09:36:59,421 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:36:59,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:36:59,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 09:36:59,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:36:59,472 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:36:59,472 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:36:59,506 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:36:59,506 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [605141277] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:36:59,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [321084908] [2022-12-14 09:36:59,508 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:36:59,508 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:36:59,508 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:36:59,508 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:36:59,508 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:36:59,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:36:59,529 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:36:59,530 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:36:59,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:36:59,537 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:36:59,551 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:36:59,552 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:36:59,581 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:36:59,583 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:36:59,593 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:36:59,594 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:36:59,625 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:36:59,661 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:36:59,843 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '496#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:36:59,844 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:36:59,844 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:36:59,844 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2022-12-14 09:36:59,844 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079270038] [2022-12-14 09:36:59,844 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:36:59,844 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-12-14 09:36:59,845 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:36:59,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-12-14 09:36:59,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2022-12-14 09:36:59,846 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:36:59,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:36:59,885 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2022-12-14 09:36:59,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 09:36:59,886 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-12-14 09:36:59,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:36:59,886 INFO L225 Difference]: With dead ends: 34 [2022-12-14 09:36:59,886 INFO L226 Difference]: Without dead ends: 22 [2022-12-14 09:36:59,887 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 27 SyntacticMatches, 5 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2022-12-14 09:36:59,887 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 12 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 09:36:59,887 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 19 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 09:36:59,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-12-14 09:36:59,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 16. [2022-12-14 09:36:59,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:36:59,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2022-12-14 09:36:59,890 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 14 [2022-12-14 09:36:59,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:36:59,890 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2022-12-14 09:36:59,890 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:36:59,890 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2022-12-14 09:36:59,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-12-14 09:36:59,890 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:36:59,890 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1] [2022-12-14 09:36:59,895 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 09:37:00,091 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:37:00,092 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:37:00,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:37:00,093 INFO L85 PathProgramCache]: Analyzing trace with hash -1296967390, now seen corresponding path program 4 times [2022-12-14 09:37:00,094 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:37:00,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1821397300] [2022-12-14 09:37:00,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:37:00,095 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:37:00,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:37:00,326 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:00,326 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:37:00,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1821397300] [2022-12-14 09:37:00,326 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1821397300] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:37:00,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1163983753] [2022-12-14 09:37:00,326 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:37:00,326 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:37:00,326 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:37:00,327 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:37:00,328 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 09:37:00,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:37:00,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 09:37:00,368 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:37:00,403 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 09:37:00,492 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:00,492 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:37:00,546 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:37:00,548 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:37:00,553 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:37:00,556 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:37:00,567 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:00,567 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1163983753] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:37:00,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2083132766] [2022-12-14 09:37:00,569 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:37:00,569 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:37:00,570 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:37:00,570 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:37:00,570 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:37:00,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:00,600 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:37:00,600 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:37:00,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:00,620 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:37:00,621 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:37:00,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:00,637 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:37:00,663 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:00,664 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:00,673 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:37:00,673 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:37:00,703 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:37:00,746 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:37:00,959 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '677#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:37:00,959 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:37:00,959 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:37:00,959 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2022-12-14 09:37:00,959 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1517221060] [2022-12-14 09:37:00,959 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:37:00,960 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-12-14 09:37:00,960 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:37:00,960 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-12-14 09:37:00,960 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=482, Unknown=0, NotChecked=0, Total=552 [2022-12-14 09:37:00,960 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 19 states, 19 states have (on average 1.6842105263157894) internal successors, (32), 19 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:01,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:37:01,079 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2022-12-14 09:37:01,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-12-14 09:37:01,080 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.6842105263157894) internal successors, (32), 19 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-12-14 09:37:01,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:37:01,080 INFO L225 Difference]: With dead ends: 23 [2022-12-14 09:37:01,080 INFO L226 Difference]: Without dead ends: 21 [2022-12-14 09:37:01,080 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 25 SyntacticMatches, 6 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=752, Unknown=0, NotChecked=0, Total=870 [2022-12-14 09:37:01,081 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 27 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 09:37:01,081 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 36 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 135 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 09:37:01,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-12-14 09:37:01,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2022-12-14 09:37:01,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:01,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2022-12-14 09:37:01,084 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 15 [2022-12-14 09:37:01,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:37:01,084 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2022-12-14 09:37:01,084 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.6842105263157894) internal successors, (32), 19 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:01,084 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2022-12-14 09:37:01,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-12-14 09:37:01,084 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:37:01,084 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1] [2022-12-14 09:37:01,088 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 09:37:01,285 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-12-14 09:37:01,286 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:37:01,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:37:01,287 INFO L85 PathProgramCache]: Analyzing trace with hash -424927205, now seen corresponding path program 5 times [2022-12-14 09:37:01,287 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:37:01,287 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1683376451] [2022-12-14 09:37:01,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:37:01,288 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:37:01,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:37:01,392 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:01,392 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:37:01,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1683376451] [2022-12-14 09:37:01,392 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1683376451] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:37:01,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [141376415] [2022-12-14 09:37:01,392 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:37:01,392 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:37:01,392 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:37:01,393 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:37:01,394 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 09:37:01,437 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 09:37:01,437 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:37:01,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 10 conjunts are in the unsatisfiable core [2022-12-14 09:37:01,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:37:01,503 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:01,503 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:37:01,548 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:01,548 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [141376415] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:37:01,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [308387067] [2022-12-14 09:37:01,550 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:37:01,550 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:37:01,550 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:37:01,550 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:37:01,550 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:37:01,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:01,570 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:37:01,571 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:37:01,578 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:01,579 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:37:01,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:01,593 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-12-14 09:37:01,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:01,627 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 09:37:01,644 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-12-14 09:37:01,644 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 202 [2022-12-14 09:37:01,684 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:37:01,733 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:37:01,865 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '871#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:37:01,866 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:37:01,866 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:37:01,866 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 16 [2022-12-14 09:37:01,866 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950629876] [2022-12-14 09:37:01,866 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:37:01,866 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-12-14 09:37:01,866 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:37:01,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-12-14 09:37:01,867 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2022-12-14 09:37:01,867 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:01,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:37:01,910 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2022-12-14 09:37:01,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-12-14 09:37:01,911 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2022-12-14 09:37:01,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:37:01,911 INFO L225 Difference]: With dead ends: 41 [2022-12-14 09:37:01,911 INFO L226 Difference]: Without dead ends: 26 [2022-12-14 09:37:01,912 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 36 SyntacticMatches, 7 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 213 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=113, Invalid=439, Unknown=0, NotChecked=0, Total=552 [2022-12-14 09:37:01,912 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 16 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 09:37:01,912 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 26 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 09:37:01,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-12-14 09:37:01,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 20. [2022-12-14 09:37:01,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:01,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2022-12-14 09:37:01,915 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 18 [2022-12-14 09:37:01,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:37:01,915 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2022-12-14 09:37:01,915 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:01,915 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2022-12-14 09:37:01,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-12-14 09:37:01,916 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:37:01,916 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1] [2022-12-14 09:37:01,920 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 09:37:02,116 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:37:02,118 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:37:02,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:37:02,119 INFO L85 PathProgramCache]: Analyzing trace with hash 1950268161, now seen corresponding path program 6 times [2022-12-14 09:37:02,119 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:37:02,119 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1082671276] [2022-12-14 09:37:02,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:37:02,120 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:37:02,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:37:02,324 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:02,324 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:37:02,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1082671276] [2022-12-14 09:37:02,325 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1082671276] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:37:02,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [767220667] [2022-12-14 09:37:02,325 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:37:02,325 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:37:02,325 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:37:02,326 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:37:02,327 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 09:37:02,374 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:37:02,374 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:37:02,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 35 conjunts are in the unsatisfiable core [2022-12-14 09:37:02,377 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:37:02,430 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 09:37:02,584 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:02,584 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:37:02,679 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:37:02,681 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:37:02,685 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:37:02,687 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:37:02,698 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:02,698 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [767220667] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:37:02,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1577602930] [2022-12-14 09:37:02,699 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:37:02,699 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:37:02,700 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:37:02,700 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:37:02,700 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:37:02,710 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:02,720 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:37:02,720 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:37:02,726 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:02,727 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:37:02,740 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:02,741 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:37:02,785 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:02,787 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:02,798 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:37:02,798 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:37:02,834 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:37:02,871 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:37:03,188 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1100#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:37:03,188 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:37:03,188 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:37:03,188 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 13] total 25 [2022-12-14 09:37:03,188 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [486013705] [2022-12-14 09:37:03,188 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:37:03,189 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-12-14 09:37:03,189 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:37:03,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-12-14 09:37:03,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=774, Unknown=0, NotChecked=0, Total=870 [2022-12-14 09:37:03,190 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 25 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:03,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:37:03,422 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2022-12-14 09:37:03,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-12-14 09:37:03,422 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2022-12-14 09:37:03,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:37:03,423 INFO L225 Difference]: With dead ends: 27 [2022-12-14 09:37:03,423 INFO L226 Difference]: Without dead ends: 25 [2022-12-14 09:37:03,424 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 32 SyntacticMatches, 7 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 385 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=175, Invalid=1307, Unknown=0, NotChecked=0, Total=1482 [2022-12-14 09:37:03,425 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 31 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 09:37:03,425 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 54 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 09:37:03,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-12-14 09:37:03,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2022-12-14 09:37:03,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:03,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2022-12-14 09:37:03,430 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 19 [2022-12-14 09:37:03,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:37:03,430 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2022-12-14 09:37:03,430 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:03,430 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2022-12-14 09:37:03,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-12-14 09:37:03,431 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:37:03,431 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1] [2022-12-14 09:37:03,436 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 09:37:03,631 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:37:03,633 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:37:03,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:37:03,634 INFO L85 PathProgramCache]: Analyzing trace with hash -1874002468, now seen corresponding path program 7 times [2022-12-14 09:37:03,634 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:37:03,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1758372105] [2022-12-14 09:37:03,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:37:03,635 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:37:03,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:37:03,756 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:03,756 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:37:03,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1758372105] [2022-12-14 09:37:03,756 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1758372105] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:37:03,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1077876109] [2022-12-14 09:37:03,757 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:37:03,757 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:37:03,757 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:37:03,758 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:37:03,758 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 09:37:03,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:37:03,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 09:37:03,806 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:37:03,902 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:03,902 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:37:03,966 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:03,966 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1077876109] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:37:03,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1837521391] [2022-12-14 09:37:03,968 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:37:03,968 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:37:03,969 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:37:03,969 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:37:03,969 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:37:03,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:03,993 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:37:03,993 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:37:04,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:04,016 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:37:04,017 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:37:04,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:04,033 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-12-14 09:37:04,069 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:04,070 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 09:37:04,089 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-12-14 09:37:04,090 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 202 [2022-12-14 09:37:04,125 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:37:04,159 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:37:04,367 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1339#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:37:04,367 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:37:04,368 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:37:04,368 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2022-12-14 09:37:04,368 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1902912955] [2022-12-14 09:37:04,368 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:37:04,368 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-12-14 09:37:04,368 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:37:04,369 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-12-14 09:37:04,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=444, Unknown=0, NotChecked=0, Total=552 [2022-12-14 09:37:04,370 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 19 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:04,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:37:04,451 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2022-12-14 09:37:04,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 09:37:04,451 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 19 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2022-12-14 09:37:04,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:37:04,452 INFO L225 Difference]: With dead ends: 48 [2022-12-14 09:37:04,452 INFO L226 Difference]: Without dead ends: 30 [2022-12-14 09:37:04,453 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 45 SyntacticMatches, 9 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 302 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=154, Invalid=602, Unknown=0, NotChecked=0, Total=756 [2022-12-14 09:37:04,453 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 26 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 09:37:04,453 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 49 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 09:37:04,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-12-14 09:37:04,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 24. [2022-12-14 09:37:04,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:04,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2022-12-14 09:37:04,458 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 22 [2022-12-14 09:37:04,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:37:04,459 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2022-12-14 09:37:04,459 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 19 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:04,459 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2022-12-14 09:37:04,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-12-14 09:37:04,459 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:37:04,459 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1] [2022-12-14 09:37:04,464 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-12-14 09:37:04,660 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:37:04,661 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:37:04,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:37:04,662 INFO L85 PathProgramCache]: Analyzing trace with hash -1951681086, now seen corresponding path program 8 times [2022-12-14 09:37:04,663 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:37:04,663 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [793432359] [2022-12-14 09:37:04,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:37:04,663 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:37:04,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:37:04,930 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:04,930 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:37:04,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [793432359] [2022-12-14 09:37:04,931 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [793432359] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:37:04,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1527441586] [2022-12-14 09:37:04,931 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:37:04,931 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:37:04,931 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:37:04,932 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:37:04,932 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 09:37:05,023 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-12-14 09:37:05,023 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:37:05,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 47 conjunts are in the unsatisfiable core [2022-12-14 09:37:05,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:37:05,093 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 09:37:05,352 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:05,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:37:05,592 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:37:05,594 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:37:05,720 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:05,720 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1527441586] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:37:05,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2068445507] [2022-12-14 09:37:05,721 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:37:05,721 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:37:05,721 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:37:05,722 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:37:05,722 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:37:05,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:05,742 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:37:05,743 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:37:05,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:05,763 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:37:05,764 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:37:05,778 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:05,779 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:37:05,805 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:05,807 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:05,816 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:37:05,816 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:37:05,839 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:37:05,868 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:37:06,192 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1624#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:37:06,192 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:37:06,192 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:37:06,192 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15, 15] total 39 [2022-12-14 09:37:06,192 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [408691070] [2022-12-14 09:37:06,193 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:37:06,193 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-12-14 09:37:06,193 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:37:06,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-12-14 09:37:06,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=1691, Unknown=0, NotChecked=0, Total=1892 [2022-12-14 09:37:06,195 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 39 states, 39 states have (on average 1.641025641025641) internal successors, (64), 39 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:07,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:37:07,260 INFO L93 Difference]: Finished difference Result 60 states and 67 transitions. [2022-12-14 09:37:07,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-12-14 09:37:07,260 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.641025641025641) internal successors, (64), 39 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2022-12-14 09:37:07,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:37:07,261 INFO L225 Difference]: With dead ends: 60 [2022-12-14 09:37:07,261 INFO L226 Difference]: Without dead ends: 58 [2022-12-14 09:37:07,263 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1279 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=629, Invalid=4627, Unknown=0, NotChecked=0, Total=5256 [2022-12-14 09:37:07,263 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 69 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 418 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 447 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 418 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 09:37:07,263 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 89 Invalid, 447 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 418 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 09:37:07,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-12-14 09:37:07,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 43. [2022-12-14 09:37:07,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 42 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:07,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2022-12-14 09:37:07,270 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 23 [2022-12-14 09:37:07,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:37:07,270 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2022-12-14 09:37:07,270 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.641025641025641) internal successors, (64), 39 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:07,270 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2022-12-14 09:37:07,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-12-14 09:37:07,270 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:37:07,270 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1, 1] [2022-12-14 09:37:07,275 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-12-14 09:37:07,471 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-12-14 09:37:07,472 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:37:07,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:37:07,473 INFO L85 PathProgramCache]: Analyzing trace with hash -550382495, now seen corresponding path program 9 times [2022-12-14 09:37:07,474 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:37:07,474 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1421619448] [2022-12-14 09:37:07,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:37:07,474 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:37:07,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:37:07,804 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:07,805 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:37:07,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1421619448] [2022-12-14 09:37:07,805 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1421619448] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:37:07,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [250902916] [2022-12-14 09:37:07,805 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:37:07,805 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:37:07,805 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:37:07,806 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:37:07,807 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 09:37:07,868 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:37:07,868 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:37:07,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 41 conjunts are in the unsatisfiable core [2022-12-14 09:37:07,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:37:07,888 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 15 treesize of output 11 [2022-12-14 09:37:08,107 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 47 treesize of output 23 [2022-12-14 09:37:08,126 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:08,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:37:08,244 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:37:08,246 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:37:08,250 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:37:08,252 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:37:08,268 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:08,268 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [250902916] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:37:08,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1972244675] [2022-12-14 09:37:08,269 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:37:08,269 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:37:08,270 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:37:08,270 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:37:08,270 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:37:08,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:08,288 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:37:08,288 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:37:08,295 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:08,305 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:37:08,305 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:37:08,321 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:08,321 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:37:08,353 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:08,355 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:08,364 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:37:08,365 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:37:08,396 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:37:08,431 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:37:08,655 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2013#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:37:08,656 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:37:08,656 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:37:08,656 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 17] total 25 [2022-12-14 09:37:08,656 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [451840752] [2022-12-14 09:37:08,656 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:37:08,656 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-12-14 09:37:08,656 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:37:08,657 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-12-14 09:37:08,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=785, Unknown=0, NotChecked=0, Total=870 [2022-12-14 09:37:08,658 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 25 states, 25 states have (on average 1.92) internal successors, (48), 25 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:09,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:37:09,015 INFO L93 Difference]: Finished difference Result 69 states and 71 transitions. [2022-12-14 09:37:09,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-12-14 09:37:09,015 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.92) internal successors, (48), 25 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2022-12-14 09:37:09,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:37:09,016 INFO L225 Difference]: With dead ends: 69 [2022-12-14 09:37:09,016 INFO L226 Difference]: Without dead ends: 67 [2022-12-14 09:37:09,017 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 62 SyntacticMatches, 5 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 300 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=176, Invalid=1630, Unknown=0, NotChecked=0, Total=1806 [2022-12-14 09:37:09,017 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 29 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 417 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 427 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 417 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 09:37:09,018 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 137 Invalid, 427 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 417 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 09:37:09,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-12-14 09:37:09,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 43. [2022-12-14 09:37:09,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 42 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:09,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2022-12-14 09:37:09,029 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 27 [2022-12-14 09:37:09,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:37:09,029 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2022-12-14 09:37:09,030 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.92) internal successors, (48), 25 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:09,030 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2022-12-14 09:37:09,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-12-14 09:37:09,031 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:37:09,031 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1, 1] [2022-12-14 09:37:09,035 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-12-14 09:37:09,231 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-12-14 09:37:09,232 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:37:09,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:37:09,232 INFO L85 PathProgramCache]: Analyzing trace with hash 1745021052, now seen corresponding path program 10 times [2022-12-14 09:37:09,232 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:37:09,232 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1371991390] [2022-12-14 09:37:09,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:37:09,233 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:37:09,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:37:09,360 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 41 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:09,360 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:37:09,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1371991390] [2022-12-14 09:37:09,360 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1371991390] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:37:09,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [273511211] [2022-12-14 09:37:09,360 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:37:09,360 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:37:09,361 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:37:09,361 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:37:09,362 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-12-14 09:37:09,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:37:09,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 09:37:09,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:37:09,536 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:09,536 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:37:09,629 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:09,630 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [273511211] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:37:09,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [206872049] [2022-12-14 09:37:09,631 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:37:09,631 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:37:09,632 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:37:09,632 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:37:09,632 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:37:09,641 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:09,650 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:37:09,651 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:37:09,657 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:09,668 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:37:09,669 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:37:09,683 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:09,683 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-12-14 09:37:09,713 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:09,714 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 09:37:09,730 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-12-14 09:37:09,730 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 202 [2022-12-14 09:37:09,783 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:37:09,814 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:37:09,996 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2399#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:37:09,996 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:37:09,997 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:37:09,997 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 25 [2022-12-14 09:37:09,997 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489538979] [2022-12-14 09:37:09,997 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:37:09,997 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-12-14 09:37:09,997 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:37:09,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-12-14 09:37:09,998 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2022-12-14 09:37:09,998 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 25 states, 25 states have (on average 2.24) internal successors, (56), 25 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:10,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:37:10,183 INFO L93 Difference]: Finished difference Result 91 states and 94 transitions. [2022-12-14 09:37:10,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-12-14 09:37:10,183 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.24) internal successors, (56), 25 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-12-14 09:37:10,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:37:10,184 INFO L225 Difference]: With dead ends: 91 [2022-12-14 09:37:10,184 INFO L226 Difference]: Without dead ends: 38 [2022-12-14 09:37:10,184 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 63 SyntacticMatches, 13 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 616 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=351, Invalid=1371, Unknown=0, NotChecked=0, Total=1722 [2022-12-14 09:37:10,185 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 86 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 186 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 09:37:10,185 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [86 Valid, 74 Invalid, 186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 141 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 09:37:10,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-12-14 09:37:10,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 32. [2022-12-14 09:37:10,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:10,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2022-12-14 09:37:10,193 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 30 [2022-12-14 09:37:10,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:37:10,194 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2022-12-14 09:37:10,194 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.24) internal successors, (56), 25 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:10,194 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2022-12-14 09:37:10,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-12-14 09:37:10,194 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:37:10,194 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1, 1] [2022-12-14 09:37:10,199 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-12-14 09:37:10,395 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-12-14 09:37:10,395 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:37:10,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:37:10,395 INFO L85 PathProgramCache]: Analyzing trace with hash 1177967202, now seen corresponding path program 11 times [2022-12-14 09:37:10,396 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:37:10,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [450623756] [2022-12-14 09:37:10,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:37:10,396 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:37:10,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:37:10,734 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:10,734 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:37:10,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [450623756] [2022-12-14 09:37:10,734 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [450623756] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:37:10,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1236457035] [2022-12-14 09:37:10,735 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:37:10,735 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:37:10,735 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:37:10,736 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:37:10,737 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-12-14 09:37:10,929 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-12-14 09:37:10,929 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:37:10,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 40 conjunts are in the unsatisfiable core [2022-12-14 09:37:10,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:37:10,953 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 15 treesize of output 11 [2022-12-14 09:37:11,159 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 47 treesize of output 23 [2022-12-14 09:37:11,179 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:11,179 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:37:11,279 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:37:11,280 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:37:11,284 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:37:11,286 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:37:11,313 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:11,313 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1236457035] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:37:11,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [940429253] [2022-12-14 09:37:11,314 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:37:11,314 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:37:11,315 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:37:11,315 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:37:11,315 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:37:11,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:11,334 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:37:11,334 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:37:11,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:11,342 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:37:11,355 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:11,356 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:37:11,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:11,385 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:11,393 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:37:11,393 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:37:11,420 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:37:11,452 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:37:11,743 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2806#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:37:11,743 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:37:11,743 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:37:11,743 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 26 [2022-12-14 09:37:11,744 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1968002382] [2022-12-14 09:37:11,744 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:37:11,744 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-12-14 09:37:11,744 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:37:11,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-12-14 09:37:11,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=848, Unknown=0, NotChecked=0, Total=930 [2022-12-14 09:37:11,745 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand has 26 states, 26 states have (on average 2.0384615384615383) internal successors, (53), 26 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:12,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:37:12,157 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2022-12-14 09:37:12,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-12-14 09:37:12,158 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.0384615384615383) internal successors, (53), 26 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2022-12-14 09:37:12,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:37:12,158 INFO L225 Difference]: With dead ends: 39 [2022-12-14 09:37:12,158 INFO L226 Difference]: Without dead ends: 37 [2022-12-14 09:37:12,159 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 75 SyntacticMatches, 5 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=151, Invalid=1489, Unknown=0, NotChecked=0, Total=1640 [2022-12-14 09:37:12,160 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 22 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 530 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 538 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 530 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 09:37:12,160 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 147 Invalid, 538 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 530 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 09:37:12,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-12-14 09:37:12,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2022-12-14 09:37:12,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:12,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2022-12-14 09:37:12,167 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 31 [2022-12-14 09:37:12,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:37:12,167 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2022-12-14 09:37:12,167 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.0384615384615383) internal successors, (53), 26 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:12,167 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2022-12-14 09:37:12,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-12-14 09:37:12,168 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:37:12,168 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1] [2022-12-14 09:37:12,172 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-12-14 09:37:12,368 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-12-14 09:37:12,369 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:37:12,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:37:12,370 INFO L85 PathProgramCache]: Analyzing trace with hash -1352067365, now seen corresponding path program 12 times [2022-12-14 09:37:12,370 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:37:12,371 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1074853508] [2022-12-14 09:37:12,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:37:12,371 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:37:12,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:37:12,531 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 58 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:12,531 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:37:12,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1074853508] [2022-12-14 09:37:12,532 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1074853508] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:37:12,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [412884527] [2022-12-14 09:37:12,532 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:37:12,532 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:37:12,532 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:37:12,532 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:37:12,533 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-12-14 09:37:12,591 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:37:12,591 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:37:12,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 09:37:12,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:37:12,755 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:12,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:37:12,865 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:12,865 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [412884527] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:37:12,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1865913957] [2022-12-14 09:37:12,866 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:37:12,866 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:37:12,866 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:37:12,867 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:37:12,867 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:37:12,877 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:12,885 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:37:12,885 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:37:12,890 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:12,891 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:37:12,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:12,901 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:37:12,926 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:12,928 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:12,935 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:37:12,936 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:37:12,967 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:37:13,002 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:37:13,169 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3164#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:37:13,170 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:37:13,170 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:37:13,170 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 28 [2022-12-14 09:37:13,170 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [74970967] [2022-12-14 09:37:13,170 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:37:13,170 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-12-14 09:37:13,170 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:37:13,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-12-14 09:37:13,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=849, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 09:37:13,171 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand has 28 states, 28 states have (on average 2.25) internal successors, (63), 28 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:13,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:37:13,278 INFO L93 Difference]: Finished difference Result 69 states and 71 transitions. [2022-12-14 09:37:13,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-12-14 09:37:13,279 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.25) internal successors, (63), 28 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2022-12-14 09:37:13,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:37:13,279 INFO L225 Difference]: With dead ends: 69 [2022-12-14 09:37:13,279 INFO L226 Difference]: Without dead ends: 42 [2022-12-14 09:37:13,279 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 72 SyntacticMatches, 15 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 647 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=319, Invalid=1241, Unknown=0, NotChecked=0, Total=1560 [2022-12-14 09:37:13,280 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 80 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 09:37:13,280 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 64 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 118 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 09:37:13,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-12-14 09:37:13,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 36. [2022-12-14 09:37:13,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 35 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:13,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2022-12-14 09:37:13,286 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 34 [2022-12-14 09:37:13,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:37:13,286 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2022-12-14 09:37:13,286 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.25) internal successors, (63), 28 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:13,286 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2022-12-14 09:37:13,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-12-14 09:37:13,287 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:37:13,287 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1, 1] [2022-12-14 09:37:13,291 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-12-14 09:37:13,487 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:37:13,488 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:37:13,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:37:13,489 INFO L85 PathProgramCache]: Analyzing trace with hash -2128271935, now seen corresponding path program 13 times [2022-12-14 09:37:13,489 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:37:13,489 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1504006840] [2022-12-14 09:37:13,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:37:13,490 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:37:13,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:37:13,937 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:13,937 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:37:13,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1504006840] [2022-12-14 09:37:13,937 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1504006840] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:37:13,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [349542609] [2022-12-14 09:37:13,937 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:37:13,937 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:37:13,937 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:37:13,938 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:37:13,939 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-12-14 09:37:13,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:37:13,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 62 conjunts are in the unsatisfiable core [2022-12-14 09:37:13,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:37:14,162 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 09:37:14,459 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:14,459 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:37:14,561 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:37:14,562 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:37:14,565 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:37:14,567 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:37:14,593 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:14,593 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [349542609] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:37:14,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [689171733] [2022-12-14 09:37:14,594 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:37:14,594 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:37:14,594 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:37:14,595 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:37:14,595 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:37:14,605 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:14,615 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:37:14,616 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:37:14,622 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:14,623 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:37:14,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:14,635 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:37:14,660 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:14,661 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:14,672 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:37:14,673 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:37:14,702 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:37:14,732 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:37:15,078 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3575#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:37:15,078 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:37:15,079 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:37:15,079 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2022-12-14 09:37:15,079 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749834975] [2022-12-14 09:37:15,079 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:37:15,079 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-12-14 09:37:15,079 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:37:15,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-12-14 09:37:15,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=1762, Unknown=0, NotChecked=0, Total=1892 [2022-12-14 09:37:15,080 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand has 39 states, 39 states have (on average 1.8461538461538463) internal successors, (72), 39 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:15,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:37:15,540 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2022-12-14 09:37:15,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-12-14 09:37:15,540 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.8461538461538463) internal successors, (72), 39 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2022-12-14 09:37:15,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:37:15,541 INFO L225 Difference]: With dead ends: 43 [2022-12-14 09:37:15,541 INFO L226 Difference]: Without dead ends: 41 [2022-12-14 09:37:15,541 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 78 SyntacticMatches, 3 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 555 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=218, Invalid=2752, Unknown=0, NotChecked=0, Total=2970 [2022-12-14 09:37:15,541 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 28 mSDsluCounter, 189 mSDsCounter, 0 mSdLazyCounter, 668 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 678 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 668 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 09:37:15,542 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 199 Invalid, 678 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 668 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 09:37:15,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-12-14 09:37:15,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2022-12-14 09:37:15,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 38 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:15,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2022-12-14 09:37:15,548 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 35 [2022-12-14 09:37:15,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:37:15,548 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2022-12-14 09:37:15,548 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.8461538461538463) internal successors, (72), 39 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:15,549 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2022-12-14 09:37:15,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-12-14 09:37:15,549 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:37:15,549 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 1, 1, 1, 1, 1] [2022-12-14 09:37:15,553 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-12-14 09:37:15,750 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-12-14 09:37:15,750 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:37:15,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:37:15,751 INFO L85 PathProgramCache]: Analyzing trace with hash -1037198564, now seen corresponding path program 14 times [2022-12-14 09:37:15,751 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:37:15,752 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [728298337] [2022-12-14 09:37:15,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:37:15,752 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:37:15,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:37:15,956 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 78 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:15,957 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:37:15,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [728298337] [2022-12-14 09:37:15,957 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [728298337] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:37:15,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [616313430] [2022-12-14 09:37:15,957 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:37:15,957 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:37:15,957 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:37:15,958 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:37:15,959 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-12-14 09:37:16,209 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-12-14 09:37:16,209 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:37:16,211 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 20 conjunts are in the unsatisfiable core [2022-12-14 09:37:16,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:37:16,396 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:16,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:37:16,506 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:16,507 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [616313430] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:37:16,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [665171716] [2022-12-14 09:37:16,508 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:37:16,508 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:37:16,508 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:37:16,508 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:37:16,508 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:37:16,516 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:16,526 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:37:16,526 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:37:16,532 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:16,532 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:37:16,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:16,543 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-12-14 09:37:16,570 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:16,571 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 09:37:16,589 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-12-14 09:37:16,589 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 202 [2022-12-14 09:37:16,633 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:37:16,664 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:37:16,915 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3974#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:37:16,915 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:37:16,915 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:37:16,915 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 31 [2022-12-14 09:37:16,915 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [839528542] [2022-12-14 09:37:16,915 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:37:16,916 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-12-14 09:37:16,916 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:37:16,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-12-14 09:37:16,917 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=248, Invalid=1012, Unknown=0, NotChecked=0, Total=1260 [2022-12-14 09:37:16,917 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand has 31 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 31 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:17,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:37:17,074 INFO L93 Difference]: Finished difference Result 76 states and 78 transitions. [2022-12-14 09:37:17,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-12-14 09:37:17,074 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 31 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2022-12-14 09:37:17,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:37:17,075 INFO L225 Difference]: With dead ends: 76 [2022-12-14 09:37:17,075 INFO L226 Difference]: Without dead ends: 46 [2022-12-14 09:37:17,076 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 81 SyntacticMatches, 17 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 788 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=1504, Unknown=0, NotChecked=0, Total=1892 [2022-12-14 09:37:17,076 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 60 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 09:37:17,077 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 78 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 149 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 09:37:17,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-12-14 09:37:17,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 40. [2022-12-14 09:37:17,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 39 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:17,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2022-12-14 09:37:17,084 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 38 [2022-12-14 09:37:17,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:37:17,084 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2022-12-14 09:37:17,084 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 31 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:17,084 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2022-12-14 09:37:17,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-12-14 09:37:17,085 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:37:17,085 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 1, 1, 1, 1, 1] [2022-12-14 09:37:17,089 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-12-14 09:37:17,285 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-12-14 09:37:17,286 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:37:17,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:37:17,287 INFO L85 PathProgramCache]: Analyzing trace with hash 668714754, now seen corresponding path program 15 times [2022-12-14 09:37:17,287 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:37:17,288 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1163824357] [2022-12-14 09:37:17,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:37:17,288 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:37:17,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:37:17,760 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:17,760 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:37:17,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1163824357] [2022-12-14 09:37:17,760 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1163824357] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:37:17,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1425929417] [2022-12-14 09:37:17,760 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:37:17,760 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:37:17,761 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:37:17,761 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:37:17,762 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-12-14 09:37:17,851 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:37:17,851 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:37:17,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 53 conjunts are in the unsatisfiable core [2022-12-14 09:37:17,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:37:17,877 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 15 treesize of output 11 [2022-12-14 09:37:18,228 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 47 treesize of output 23 [2022-12-14 09:37:18,252 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:18,252 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:37:18,403 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:37:18,404 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:37:18,406 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:37:18,408 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:37:18,434 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:18,434 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1425929417] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:37:18,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1932725875] [2022-12-14 09:37:18,436 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:37:18,436 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:37:18,436 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:37:18,436 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:37:18,436 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:37:18,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:18,457 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:37:18,458 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:37:18,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:18,464 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:37:18,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:18,475 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:37:18,500 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:18,501 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:18,511 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:37:18,511 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:37:18,536 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:37:18,577 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:37:19,166 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4422#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:37:19,166 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:37:19,166 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:37:19,166 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23, 23] total 34 [2022-12-14 09:37:19,166 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1568434872] [2022-12-14 09:37:19,166 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:37:19,167 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-12-14 09:37:19,167 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:37:19,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-12-14 09:37:19,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=1373, Unknown=0, NotChecked=0, Total=1482 [2022-12-14 09:37:19,167 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand has 34 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:19,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:37:19,624 INFO L93 Difference]: Finished difference Result 47 states and 48 transitions. [2022-12-14 09:37:19,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-12-14 09:37:19,624 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2022-12-14 09:37:19,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:37:19,625 INFO L225 Difference]: With dead ends: 47 [2022-12-14 09:37:19,625 INFO L226 Difference]: Without dead ends: 45 [2022-12-14 09:37:19,625 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 86 SyntacticMatches, 14 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 560 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=213, Invalid=2543, Unknown=0, NotChecked=0, Total=2756 [2022-12-14 09:37:19,626 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 25 mSDsluCounter, 201 mSDsCounter, 0 mSdLazyCounter, 836 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 848 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 836 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 09:37:19,626 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 211 Invalid, 848 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 836 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 09:37:19,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-12-14 09:37:19,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2022-12-14 09:37:19,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 42 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:19,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2022-12-14 09:37:19,634 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 39 [2022-12-14 09:37:19,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:37:19,634 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2022-12-14 09:37:19,635 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 34 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:19,635 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2022-12-14 09:37:19,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-12-14 09:37:19,635 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:37:19,635 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 1, 1, 1, 1, 1] [2022-12-14 09:37:19,640 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-12-14 09:37:19,836 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-12-14 09:37:19,837 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:37:19,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:37:19,838 INFO L85 PathProgramCache]: Analyzing trace with hash 1627711035, now seen corresponding path program 16 times [2022-12-14 09:37:19,838 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:37:19,838 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1675133328] [2022-12-14 09:37:19,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:37:19,839 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:37:19,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:37:20,055 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 101 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:20,056 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:37:20,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1675133328] [2022-12-14 09:37:20,056 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1675133328] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:37:20,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1270487131] [2022-12-14 09:37:20,056 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:37:20,056 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:37:20,056 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:37:20,057 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:37:20,057 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-12-14 09:37:20,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:37:20,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 22 conjunts are in the unsatisfiable core [2022-12-14 09:37:20,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:37:20,297 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:20,297 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:37:20,427 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:20,427 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1270487131] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:37:20,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1593137362] [2022-12-14 09:37:20,428 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:37:20,428 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:37:20,428 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:37:20,428 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:37:20,428 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:37:20,437 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:20,446 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:37:20,446 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:37:20,455 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:20,464 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:37:20,464 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:37:20,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:20,475 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-12-14 09:37:20,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:20,502 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 09:37:20,519 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-12-14 09:37:20,519 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 202 [2022-12-14 09:37:20,568 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:37:20,606 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:37:20,827 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4866#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:37:20,827 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:37:20,827 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:37:20,827 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 34 [2022-12-14 09:37:20,827 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1673826862] [2022-12-14 09:37:20,827 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:37:20,827 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-12-14 09:37:20,827 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:37:20,828 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-12-14 09:37:20,828 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=1189, Unknown=0, NotChecked=0, Total=1482 [2022-12-14 09:37:20,828 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand has 34 states, 34 states have (on average 2.264705882352941) internal successors, (77), 34 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:20,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:37:20,954 INFO L93 Difference]: Finished difference Result 83 states and 85 transitions. [2022-12-14 09:37:20,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-12-14 09:37:20,954 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.264705882352941) internal successors, (77), 34 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2022-12-14 09:37:20,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:37:20,954 INFO L225 Difference]: With dead ends: 83 [2022-12-14 09:37:20,955 INFO L226 Difference]: Without dead ends: 50 [2022-12-14 09:37:20,955 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 90 SyntacticMatches, 19 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 942 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=464, Invalid=1792, Unknown=0, NotChecked=0, Total=2256 [2022-12-14 09:37:20,955 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 78 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 199 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 09:37:20,956 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [78 Valid, 83 Invalid, 199 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 160 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 09:37:20,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-12-14 09:37:20,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 44. [2022-12-14 09:37:20,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 43 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:20,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 45 transitions. [2022-12-14 09:37:20,963 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 45 transitions. Word has length 42 [2022-12-14 09:37:20,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:37:20,963 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 45 transitions. [2022-12-14 09:37:20,963 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.264705882352941) internal successors, (77), 34 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:20,963 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 45 transitions. [2022-12-14 09:37:20,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-12-14 09:37:20,964 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:37:20,964 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 1, 1, 1, 1, 1] [2022-12-14 09:37:20,968 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-12-14 09:37:21,164 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-12-14 09:37:21,166 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:37:21,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:37:21,166 INFO L85 PathProgramCache]: Analyzing trace with hash -1437683935, now seen corresponding path program 17 times [2022-12-14 09:37:21,167 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:37:21,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [634895292] [2022-12-14 09:37:21,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:37:21,167 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:37:21,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:37:21,700 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:21,700 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:37:21,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [634895292] [2022-12-14 09:37:21,701 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [634895292] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:37:21,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1808378659] [2022-12-14 09:37:21,701 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:37:21,701 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:37:21,701 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:37:21,702 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:37:21,702 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-12-14 09:37:22,022 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-12-14 09:37:22,022 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:37:22,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 66 conjunts are in the unsatisfiable core [2022-12-14 09:37:22,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:37:22,257 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 09:37:22,625 INFO L321 Elim1Store]: treesize reduction 7, result has 30.0 percent of original size [2022-12-14 09:37:22,625 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 23 [2022-12-14 09:37:22,647 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 117 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:22,648 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:37:23,356 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 21 treesize of output 19 [2022-12-14 09:37:23,358 INFO L350 Elim1Store]: Elim1 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 39 treesize of output 32 [2022-12-14 09:37:23,756 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 84 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:23,756 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1808378659] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:37:23,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1309632394] [2022-12-14 09:37:23,757 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:37:23,758 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:37:23,758 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:37:23,758 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:37:23,758 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:37:23,766 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:23,775 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:37:23,775 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:37:23,781 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:23,781 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:37:23,794 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:23,795 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:37:23,818 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:23,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:23,828 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:37:23,829 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:37:23,855 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:37:23,886 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:37:24,191 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5389#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:37:24,192 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:37:24,192 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:37:24,192 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 67 [2022-12-14 09:37:24,192 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1405704464] [2022-12-14 09:37:24,192 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:37:24,192 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2022-12-14 09:37:24,193 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:37:24,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2022-12-14 09:37:24,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=4677, Unknown=0, NotChecked=0, Total=5112 [2022-12-14 09:37:24,195 INFO L87 Difference]: Start difference. First operand 44 states and 45 transitions. Second operand has 67 states, 67 states have (on average 1.8507462686567164) internal successors, (124), 67 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:26,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:37:26,573 INFO L93 Difference]: Finished difference Result 83 states and 86 transitions. [2022-12-14 09:37:26,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-12-14 09:37:26,574 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 1.8507462686567164) internal successors, (124), 67 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2022-12-14 09:37:26,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:37:26,574 INFO L225 Difference]: With dead ends: 83 [2022-12-14 09:37:26,574 INFO L226 Difference]: Without dead ends: 50 [2022-12-14 09:37:26,576 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3329 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=1191, Invalid=12381, Unknown=0, NotChecked=0, Total=13572 [2022-12-14 09:37:26,576 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 150 mSDsluCounter, 326 mSDsCounter, 0 mSdLazyCounter, 1137 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 338 SdHoareTripleChecker+Invalid, 1204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 1137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 09:37:26,576 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [150 Valid, 338 Invalid, 1204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 1137 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 09:37:26,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-12-14 09:37:26,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 48. [2022-12-14 09:37:26,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 47 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:26,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2022-12-14 09:37:26,585 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 43 [2022-12-14 09:37:26,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:37:26,585 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2022-12-14 09:37:26,585 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 1.8507462686567164) internal successors, (124), 67 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:26,585 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2022-12-14 09:37:26,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-12-14 09:37:26,586 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:37:26,586 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 1, 1, 1, 1, 1] [2022-12-14 09:37:26,590 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-12-14 09:37:26,786 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:37:26,787 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:37:26,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:37:26,788 INFO L85 PathProgramCache]: Analyzing trace with hash 1722153890, now seen corresponding path program 18 times [2022-12-14 09:37:26,788 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:37:26,788 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1031354744] [2022-12-14 09:37:26,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:37:26,789 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:37:26,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:37:27,301 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:27,301 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:37:27,301 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1031354744] [2022-12-14 09:37:27,301 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1031354744] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:37:27,301 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [227542539] [2022-12-14 09:37:27,301 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:37:27,302 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:37:27,302 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:37:27,302 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:37:27,303 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-12-14 09:37:27,456 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:37:27,457 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:37:27,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 61 conjunts are in the unsatisfiable core [2022-12-14 09:37:27,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:37:27,481 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 15 treesize of output 11 [2022-12-14 09:37:27,848 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 47 treesize of output 23 [2022-12-14 09:37:27,868 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:27,868 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:37:28,006 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:37:28,007 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:37:28,010 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:37:28,011 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:37:28,032 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:28,032 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [227542539] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:37:28,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [822344059] [2022-12-14 09:37:28,033 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:37:28,033 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:37:28,033 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:37:28,033 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:37:28,033 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:37:28,041 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:28,050 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:37:28,050 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:37:28,057 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:28,057 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:37:28,070 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:28,070 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-12-14 09:37:28,094 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:28,095 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 09:37:28,109 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-12-14 09:37:28,109 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 202 [2022-12-14 09:37:28,153 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:37:28,190 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:37:28,505 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5989#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:37:28,505 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:37:28,505 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:37:28,505 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 27, 27] total 40 [2022-12-14 09:37:28,505 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [120970105] [2022-12-14 09:37:28,505 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:37:28,505 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-12-14 09:37:28,506 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:37:28,506 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-12-14 09:37:28,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1855, Unknown=0, NotChecked=0, Total=1980 [2022-12-14 09:37:28,506 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand has 40 states, 40 states have (on average 2.075) internal successors, (83), 40 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:29,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:37:29,097 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2022-12-14 09:37:29,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-12-14 09:37:29,097 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.075) internal successors, (83), 40 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2022-12-14 09:37:29,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:37:29,097 INFO L225 Difference]: With dead ends: 55 [2022-12-14 09:37:29,097 INFO L226 Difference]: Without dead ends: 53 [2022-12-14 09:37:29,098 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 117 SyntacticMatches, 5 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 560 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=253, Invalid=3529, Unknown=0, NotChecked=0, Total=3782 [2022-12-14 09:37:29,098 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 31 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 1029 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 1043 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 1029 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 09:37:29,098 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 279 Invalid, 1043 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 1029 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 09:37:29,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-12-14 09:37:29,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2022-12-14 09:37:29,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.04) internal successors, (52), 50 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:29,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2022-12-14 09:37:29,110 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 47 [2022-12-14 09:37:29,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:37:29,110 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2022-12-14 09:37:29,110 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.075) internal successors, (83), 40 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:29,111 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2022-12-14 09:37:29,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-12-14 09:37:29,111 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:37:29,111 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 1, 1, 1, 1, 1] [2022-12-14 09:37:29,115 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2022-12-14 09:37:29,311 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:37:29,312 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:37:29,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:37:29,313 INFO L85 PathProgramCache]: Analyzing trace with hash 1306979739, now seen corresponding path program 19 times [2022-12-14 09:37:29,314 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:37:29,314 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [939363766] [2022-12-14 09:37:29,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:37:29,314 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:37:29,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:37:29,567 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 156 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:29,567 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:37:29,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [939363766] [2022-12-14 09:37:29,567 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [939363766] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:37:29,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [849964310] [2022-12-14 09:37:29,568 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:37:29,568 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:37:29,568 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:37:29,568 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:37:29,569 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-12-14 09:37:29,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:37:29,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 09:37:29,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:37:29,836 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:29,836 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:37:29,981 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:29,981 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [849964310] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:37:29,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1263099335] [2022-12-14 09:37:29,982 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:37:29,982 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:37:29,982 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:37:29,982 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:37:29,983 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:37:29,990 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:29,998 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:37:29,999 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:37:30,003 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:30,004 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:37:30,013 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:30,014 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:37:30,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:30,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:30,045 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:37:30,046 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:37:30,069 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:37:30,098 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:37:30,310 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6517#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:37:30,311 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:37:30,311 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:37:30,311 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 40 [2022-12-14 09:37:30,311 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719045810] [2022-12-14 09:37:30,311 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:37:30,311 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-12-14 09:37:30,311 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:37:30,312 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-12-14 09:37:30,312 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=395, Invalid=1585, Unknown=0, NotChecked=0, Total=1980 [2022-12-14 09:37:30,312 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand has 40 states, 40 states have (on average 2.275) internal successors, (91), 40 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:30,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:37:30,496 INFO L93 Difference]: Finished difference Result 97 states and 99 transitions. [2022-12-14 09:37:30,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-12-14 09:37:30,497 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.275) internal successors, (91), 40 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2022-12-14 09:37:30,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:37:30,497 INFO L225 Difference]: With dead ends: 97 [2022-12-14 09:37:30,498 INFO L226 Difference]: Without dead ends: 58 [2022-12-14 09:37:30,498 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 108 SyntacticMatches, 23 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1289 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=637, Invalid=2443, Unknown=0, NotChecked=0, Total=3080 [2022-12-14 09:37:30,499 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 106 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 179 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 179 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 09:37:30,499 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [106 Valid, 93 Invalid, 232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 179 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 09:37:30,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-12-14 09:37:30,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 52. [2022-12-14 09:37:30,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.0392156862745099) internal successors, (53), 51 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:30,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2022-12-14 09:37:30,510 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 50 [2022-12-14 09:37:30,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:37:30,510 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2022-12-14 09:37:30,510 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.275) internal successors, (91), 40 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:30,510 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2022-12-14 09:37:30,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-12-14 09:37:30,510 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:37:30,511 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 1, 1, 1, 1, 1] [2022-12-14 09:37:30,515 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2022-12-14 09:37:30,711 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-12-14 09:37:30,711 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:37:30,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:37:30,712 INFO L85 PathProgramCache]: Analyzing trace with hash -362516351, now seen corresponding path program 20 times [2022-12-14 09:37:30,712 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:37:30,712 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1575290874] [2022-12-14 09:37:30,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:37:30,713 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:37:30,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:37:31,298 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 265 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:31,299 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:37:31,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1575290874] [2022-12-14 09:37:31,299 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1575290874] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:37:31,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2109321664] [2022-12-14 09:37:31,299 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:37:31,299 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:37:31,299 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:37:31,300 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:37:31,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-12-14 09:37:31,873 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-12-14 09:37:31,873 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:37:31,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 78 conjunts are in the unsatisfiable core [2022-12-14 09:37:31,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:37:32,091 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 09:37:32,119 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 23 treesize of output 22 [2022-12-14 09:37:32,752 INFO L321 Elim1Store]: treesize reduction 18, result has 14.3 percent of original size [2022-12-14 09:37:32,752 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 51 treesize of output 26 [2022-12-14 09:37:32,783 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 176 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:32,783 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:37:33,843 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 28 treesize of output 26 [2022-12-14 09:37:33,846 INFO L350 Elim1Store]: Elim1 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 84 treesize of output 78 [2022-12-14 09:37:34,411 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 165 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:37:34,411 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2109321664] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:37:34,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1037481900] [2022-12-14 09:37:34,412 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:37:34,412 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:37:34,412 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:37:34,412 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:37:34,412 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:37:34,419 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:34,429 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:37:34,429 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:37:34,434 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:34,435 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:37:34,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:34,449 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:37:34,472 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:34,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:37:34,484 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:37:34,484 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:37:34,506 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:37:34,536 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:37:34,913 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7136#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:37:34,913 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:37:34,913 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:37:34,913 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 79 [2022-12-14 09:37:34,913 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485563785] [2022-12-14 09:37:34,913 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:37:34,914 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2022-12-14 09:37:34,914 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:37:34,914 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2022-12-14 09:37:34,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=603, Invalid=6369, Unknown=0, NotChecked=0, Total=6972 [2022-12-14 09:37:34,915 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand has 79 states, 79 states have (on average 1.8734177215189873) internal successors, (148), 79 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:37:59,001 WARN L837 $PredicateComparison]: unable to prove that (let ((.cse0 (select |c_#memory_int| |c_ULTIMATE.start_main_~#a~0#1.base|)) (.cse4 (* |c_ULTIMATE.start_main_~i~0#1| 4))) (let ((.cse3 (select .cse0 (+ .cse4 |c_ULTIMATE.start_main_~#a~0#1.offset| 4))) (.cse2 (+ |c_ULTIMATE.start_main_~i~0#1| 1)) (.cse1 (select .cse0 (+ .cse4 |c_ULTIMATE.start_main_~#a~0#1.offset|)))) (and (= (select .cse0 (+ 44 |c_ULTIMATE.start_main_~#a~0#1.offset|)) 11) (= (select .cse0 (+ 40 |c_ULTIMATE.start_main_~#a~0#1.offset|)) 10) (not (= |c_ULTIMATE.start___VERIFIER_assert_~cond#1| 0)) (<= 10 |c_ULTIMATE.start_main_~i~0#1|) (forall ((|v_ULTIMATE.start_main_~i~0#1_632| Int)) (or (< |c_ULTIMATE.start_main_~i~0#1| |v_ULTIMATE.start_main_~i~0#1_632|) (= (select (store .cse0 (+ |c_ULTIMATE.start_main_~#a~0#1.offset| (* 4 |c_ULTIMATE.start_main_~k~0#1|)) |c_ULTIMATE.start_main_~k~0#1|) (+ (* |v_ULTIMATE.start_main_~i~0#1_632| 4) |c_ULTIMATE.start_main_~#a~0#1.offset|)) |v_ULTIMATE.start_main_~i~0#1_632|) (< |v_ULTIMATE.start_main_~i~0#1_632| 11))) (<= .cse1 |c_ULTIMATE.start_main_~i~0#1|) (<= .cse2 .cse3) (<= .cse3 .cse2) (<= |c_ULTIMATE.start_main_~i~0#1| .cse1) (<= c_~N~0 12)))) is different from false [2022-12-14 09:38:03,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:38:03,631 INFO L93 Difference]: Finished difference Result 135 states and 140 transitions. [2022-12-14 09:38:03,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2022-12-14 09:38:03,632 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 1.8734177215189873) internal successors, (148), 79 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2022-12-14 09:38:03,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:38:03,632 INFO L225 Difference]: With dead ends: 135 [2022-12-14 09:38:03,632 INFO L226 Difference]: Without dead ends: 59 [2022-12-14 09:38:03,634 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 164 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 7344 ImplicationChecksByTransitivity, 30.3s TimeCoverageRelationStatistics Valid=2218, Invalid=24831, Unknown=15, NotChecked=326, Total=27390 [2022-12-14 09:38:03,634 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 199 mSDsluCounter, 450 mSDsCounter, 0 mSdLazyCounter, 1617 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 199 SdHoareTripleChecker+Valid, 463 SdHoareTripleChecker+Invalid, 1707 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 1617 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-12-14 09:38:03,634 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [199 Valid, 463 Invalid, 1707 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 1617 Invalid, 0 Unknown, 1 Unchecked, 1.0s Time] [2022-12-14 09:38:03,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-12-14 09:38:03,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 57. [2022-12-14 09:38:03,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.0357142857142858) internal successors, (58), 56 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:03,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2022-12-14 09:38:03,646 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 51 [2022-12-14 09:38:03,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:38:03,646 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2022-12-14 09:38:03,646 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 1.8734177215189873) internal successors, (148), 79 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:03,646 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2022-12-14 09:38:03,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-12-14 09:38:03,646 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:38:03,646 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 12, 12, 1, 1, 1, 1, 1] [2022-12-14 09:38:03,651 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2022-12-14 09:38:03,847 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-12-14 09:38:03,848 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:38:03,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:38:03,849 INFO L85 PathProgramCache]: Analyzing trace with hash -784509668, now seen corresponding path program 21 times [2022-12-14 09:38:03,849 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:38:03,849 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1466116961] [2022-12-14 09:38:03,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:38:03,850 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:38:03,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:38:04,775 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 0 proven. 327 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:04,776 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:38:04,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1466116961] [2022-12-14 09:38:04,776 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1466116961] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:38:04,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1319426122] [2022-12-14 09:38:04,776 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:38:04,776 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:38:04,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:38:04,777 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:38:04,777 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-12-14 09:38:05,033 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:38:05,033 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:38:05,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 72 conjunts are in the unsatisfiable core [2022-12-14 09:38:05,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:38:05,336 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 09:38:05,380 INFO L321 Elim1Store]: treesize reduction 23, result has 28.1 percent of original size [2022-12-14 09:38:05,380 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-12-14 09:38:05,969 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 0 proven. 327 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:05,969 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:38:06,608 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 23 treesize of output 21 [2022-12-14 09:38:06,610 INFO L350 Elim1Store]: Elim1 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 58 treesize of output 54 [2022-12-14 09:38:06,635 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 0 proven. 327 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:06,635 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1319426122] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:38:06,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [461427866] [2022-12-14 09:38:06,636 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:38:06,636 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:38:06,636 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:38:06,636 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:38:06,636 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:38:06,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:06,653 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:38:06,654 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:38:06,660 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:06,672 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:38:06,672 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:38:06,683 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:06,684 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:38:06,707 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:06,709 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:06,724 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:38:06,724 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:38:06,750 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:38:06,779 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:38:07,677 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7987#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:38:07,678 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:38:07,678 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:38:07,678 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 32, 32] total 76 [2022-12-14 09:38:07,678 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1639051492] [2022-12-14 09:38:07,678 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:38:07,678 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2022-12-14 09:38:07,678 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:38:07,679 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2022-12-14 09:38:07,679 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=272, Invalid=6208, Unknown=0, NotChecked=0, Total=6480 [2022-12-14 09:38:07,679 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand has 76 states, 76 states have (on average 1.9736842105263157) internal successors, (150), 76 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:10,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:38:10,138 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2022-12-14 09:38:10,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-12-14 09:38:10,138 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 1.9736842105263157) internal successors, (150), 76 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2022-12-14 09:38:10,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:38:10,139 INFO L225 Difference]: With dead ends: 64 [2022-12-14 09:38:10,139 INFO L226 Difference]: Without dead ends: 62 [2022-12-14 09:38:10,140 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 105 SyntacticMatches, 13 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3672 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=678, Invalid=11978, Unknown=0, NotChecked=0, Total=12656 [2022-12-14 09:38:10,140 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 179 mSDsluCounter, 543 mSDsCounter, 0 mSdLazyCounter, 1974 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 179 SdHoareTripleChecker+Valid, 557 SdHoareTripleChecker+Invalid, 1992 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 1974 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 09:38:10,140 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [179 Valid, 557 Invalid, 1992 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 1974 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 09:38:10,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-12-14 09:38:10,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 60. [2022-12-14 09:38:10,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.0338983050847457) internal successors, (61), 59 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:10,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2022-12-14 09:38:10,161 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 56 [2022-12-14 09:38:10,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:38:10,162 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2022-12-14 09:38:10,162 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 76 states have (on average 1.9736842105263157) internal successors, (150), 76 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:10,162 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2022-12-14 09:38:10,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-12-14 09:38:10,162 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:38:10,163 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 13, 13, 1, 1, 1, 1, 1] [2022-12-14 09:38:10,167 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-12-14 09:38:10,363 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-12-14 09:38:10,363 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:38:10,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:38:10,363 INFO L85 PathProgramCache]: Analyzing trace with hash 1889298913, now seen corresponding path program 22 times [2022-12-14 09:38:10,363 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:38:10,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2064091498] [2022-12-14 09:38:10,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:38:10,364 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:38:10,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:38:11,223 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:11,223 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:38:11,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2064091498] [2022-12-14 09:38:11,223 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2064091498] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:38:11,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1790165232] [2022-12-14 09:38:11,223 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:38:11,223 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:38:11,223 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:38:11,224 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:38:11,225 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-12-14 09:38:11,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:38:11,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 98 conjunts are in the unsatisfiable core [2022-12-14 09:38:11,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:38:11,743 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 09:38:12,384 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:12,384 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:38:12,526 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:38:12,528 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:38:12,531 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:38:12,532 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:38:12,562 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:12,562 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1790165232] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:38:12,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [447706463] [2022-12-14 09:38:12,563 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:38:12,563 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:38:12,564 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:38:12,564 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:38:12,564 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:38:12,574 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:12,584 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:38:12,584 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:38:12,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:12,603 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:38:12,603 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:38:12,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:12,616 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:38:12,642 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:12,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:12,654 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:38:12,654 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:38:12,684 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:38:12,720 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:38:13,087 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8650#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:38:13,087 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:38:13,087 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:38:13,088 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2022-12-14 09:38:13,088 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [508584421] [2022-12-14 09:38:13,088 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:38:13,088 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2022-12-14 09:38:13,088 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:38:13,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2022-12-14 09:38:13,089 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=4354, Unknown=0, NotChecked=0, Total=4556 [2022-12-14 09:38:13,089 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand has 63 states, 63 states have (on average 1.9047619047619047) internal successors, (120), 63 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:13,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:38:13,986 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2022-12-14 09:38:13,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-12-14 09:38:13,986 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.9047619047619047) internal successors, (120), 63 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2022-12-14 09:38:13,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:38:13,987 INFO L225 Difference]: With dead ends: 67 [2022-12-14 09:38:13,987 INFO L226 Difference]: Without dead ends: 65 [2022-12-14 09:38:13,987 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 138 SyntacticMatches, 3 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1320 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=338, Invalid=6802, Unknown=0, NotChecked=0, Total=7140 [2022-12-14 09:38:13,987 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 29 mSDsluCounter, 615 mSDsCounter, 0 mSdLazyCounter, 2045 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 631 SdHoareTripleChecker+Invalid, 2060 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 2045 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 09:38:13,988 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 631 Invalid, 2060 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 2045 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 09:38:13,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-12-14 09:38:14,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 63. [2022-12-14 09:38:14,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.032258064516129) internal successors, (64), 62 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:14,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2022-12-14 09:38:14,001 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 59 [2022-12-14 09:38:14,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:38:14,001 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2022-12-14 09:38:14,001 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 1.9047619047619047) internal successors, (120), 63 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:14,001 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2022-12-14 09:38:14,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-12-14 09:38:14,001 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:38:14,001 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 14, 1, 1, 1, 1, 1] [2022-12-14 09:38:14,005 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2022-12-14 09:38:14,202 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-12-14 09:38:14,203 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:38:14,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:38:14,204 INFO L85 PathProgramCache]: Analyzing trace with hash -1437703428, now seen corresponding path program 23 times [2022-12-14 09:38:14,204 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:38:14,204 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [688040985] [2022-12-14 09:38:14,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:38:14,205 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:38:14,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:38:14,579 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 261 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:14,579 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:38:14,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [688040985] [2022-12-14 09:38:14,579 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [688040985] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:38:14,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1256798959] [2022-12-14 09:38:14,579 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:38:14,579 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:38:14,580 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:38:14,580 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:38:14,581 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-12-14 09:38:15,123 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2022-12-14 09:38:15,123 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:38:15,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 32 conjunts are in the unsatisfiable core [2022-12-14 09:38:15,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:38:15,474 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 301 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:15,474 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:38:15,677 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 301 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:15,677 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1256798959] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:38:15,677 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [38544190] [2022-12-14 09:38:15,678 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:38:15,678 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:38:15,678 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:38:15,678 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:38:15,678 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:38:15,685 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:15,695 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:38:15,695 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:38:15,700 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:15,711 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:38:15,712 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:38:15,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:15,724 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:38:15,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:15,748 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:15,756 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:38:15,756 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:38:15,781 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:38:15,810 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:38:16,373 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9295#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:38:16,374 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:38:16,374 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:38:16,374 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 49 [2022-12-14 09:38:16,374 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1590297803] [2022-12-14 09:38:16,374 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:38:16,374 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-12-14 09:38:16,374 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:38:16,375 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-12-14 09:38:16,375 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=578, Invalid=2284, Unknown=0, NotChecked=0, Total=2862 [2022-12-14 09:38:16,375 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand has 49 states, 49 states have (on average 2.2857142857142856) internal successors, (112), 49 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:16,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:38:16,630 INFO L93 Difference]: Finished difference Result 118 states and 120 transitions. [2022-12-14 09:38:16,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-12-14 09:38:16,631 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.2857142857142856) internal successors, (112), 49 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 62 [2022-12-14 09:38:16,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:38:16,631 INFO L225 Difference]: With dead ends: 118 [2022-12-14 09:38:16,631 INFO L226 Difference]: Without dead ends: 70 [2022-12-14 09:38:16,634 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 120 SyntacticMatches, 44 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2625 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=949, Invalid=3607, Unknown=0, NotChecked=0, Total=4556 [2022-12-14 09:38:16,634 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 142 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 244 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 244 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 09:38:16,634 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [142 Valid, 121 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 244 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 09:38:16,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-12-14 09:38:16,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 64. [2022-12-14 09:38:16,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.0317460317460319) internal successors, (65), 63 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:16,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2022-12-14 09:38:16,648 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 62 [2022-12-14 09:38:16,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:38:16,648 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2022-12-14 09:38:16,649 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.2857142857142856) internal successors, (112), 49 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:16,649 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2022-12-14 09:38:16,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-12-14 09:38:16,649 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:38:16,649 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 14, 14, 1, 1, 1, 1, 1] [2022-12-14 09:38:16,654 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-12-14 09:38:16,850 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:38:16,850 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:38:16,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:38:16,851 INFO L85 PathProgramCache]: Analyzing trace with hash 1179696354, now seen corresponding path program 24 times [2022-12-14 09:38:16,852 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:38:16,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [234350925] [2022-12-14 09:38:16,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:38:16,853 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:38:16,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:38:17,634 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:17,634 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:38:17,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [234350925] [2022-12-14 09:38:17,635 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [234350925] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:38:17,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [621929043] [2022-12-14 09:38:17,635 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:38:17,635 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:38:17,635 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:38:17,636 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:38:17,636 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-12-14 09:38:17,998 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:38:17,998 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:38:18,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 77 conjunts are in the unsatisfiable core [2022-12-14 09:38:18,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:38:18,035 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 15 treesize of output 11 [2022-12-14 09:38:18,652 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 47 treesize of output 23 [2022-12-14 09:38:18,686 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:18,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:38:18,935 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:38:18,936 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:38:18,939 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:38:18,940 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:38:18,980 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:18,980 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [621929043] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:38:18,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [115105096] [2022-12-14 09:38:18,981 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:38:18,981 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:38:18,981 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:38:18,981 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:38:18,981 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:38:18,988 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:18,999 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:38:18,999 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:38:19,004 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:19,005 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:38:19,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:19,015 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:38:19,040 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:19,041 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:19,051 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:38:19,052 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:38:19,079 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:38:19,107 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:38:19,983 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10013#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:38:19,983 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:38:19,983 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:38:19,983 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 35, 35] total 52 [2022-12-14 09:38:19,983 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2047383422] [2022-12-14 09:38:19,983 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:38:19,984 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-12-14 09:38:19,984 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:38:19,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-12-14 09:38:19,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=3035, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 09:38:19,984 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand has 52 states, 52 states have (on average 2.1346153846153846) internal successors, (111), 52 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:21,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:38:21,330 INFO L93 Difference]: Finished difference Result 71 states and 72 transitions. [2022-12-14 09:38:21,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-12-14 09:38:21,330 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.1346153846153846) internal successors, (111), 52 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 63 [2022-12-14 09:38:21,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:38:21,331 INFO L225 Difference]: With dead ends: 71 [2022-12-14 09:38:21,331 INFO L226 Difference]: Without dead ends: 69 [2022-12-14 09:38:21,331 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 146 SyntacticMatches, 20 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1202 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=313, Invalid=5693, Unknown=0, NotChecked=0, Total=6006 [2022-12-14 09:38:21,332 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 31 mSDsluCounter, 554 mSDsCounter, 0 mSdLazyCounter, 2063 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 570 SdHoareTripleChecker+Invalid, 2081 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 2063 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-12-14 09:38:21,332 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 570 Invalid, 2081 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 2063 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-12-14 09:38:21,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-12-14 09:38:21,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 67. [2022-12-14 09:38:21,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 66 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:21,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2022-12-14 09:38:21,357 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 63 [2022-12-14 09:38:21,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:38:21,357 INFO L495 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2022-12-14 09:38:21,357 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.1346153846153846) internal successors, (111), 52 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:21,357 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2022-12-14 09:38:21,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-12-14 09:38:21,357 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:38:21,358 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 15, 1, 1, 1, 1, 1] [2022-12-14 09:38:21,363 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2022-12-14 09:38:21,558 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-12-14 09:38:21,559 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:38:21,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:38:21,560 INFO L85 PathProgramCache]: Analyzing trace with hash -1378507685, now seen corresponding path program 25 times [2022-12-14 09:38:21,560 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:38:21,560 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1896495872] [2022-12-14 09:38:21,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:38:21,561 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:38:21,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:38:22,049 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 302 proven. 163 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:22,050 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:38:22,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1896495872] [2022-12-14 09:38:22,050 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1896495872] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:38:22,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [397844395] [2022-12-14 09:38:22,050 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:38:22,050 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:38:22,050 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:38:22,051 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:38:22,052 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-12-14 09:38:22,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:38:22,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 34 conjunts are in the unsatisfiable core [2022-12-14 09:38:22,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:38:22,609 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 345 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:22,609 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:38:22,929 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 345 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:22,929 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [397844395] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:38:22,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1441478224] [2022-12-14 09:38:22,930 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:38:22,931 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:38:22,931 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:38:22,931 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:38:22,931 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:38:22,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:22,951 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:38:22,951 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:38:22,958 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:22,971 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:38:22,971 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:38:22,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:22,983 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:38:23,009 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:23,011 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:23,021 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:38:23,022 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:38:23,049 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:38:23,079 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:38:23,432 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10705#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:38:23,432 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:38:23,432 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:38:23,432 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 52 [2022-12-14 09:38:23,432 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195635203] [2022-12-14 09:38:23,432 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:38:23,433 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-12-14 09:38:23,433 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:38:23,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-12-14 09:38:23,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=647, Invalid=2545, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 09:38:23,434 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand has 52 states, 52 states have (on average 2.2884615384615383) internal successors, (119), 52 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:23,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:38:23,687 INFO L93 Difference]: Finished difference Result 125 states and 127 transitions. [2022-12-14 09:38:23,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-12-14 09:38:23,687 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.2884615384615383) internal successors, (119), 52 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2022-12-14 09:38:23,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:38:23,688 INFO L225 Difference]: With dead ends: 125 [2022-12-14 09:38:23,688 INFO L226 Difference]: Without dead ends: 74 [2022-12-14 09:38:23,688 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 144 SyntacticMatches, 31 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2139 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1067, Invalid=4045, Unknown=0, NotChecked=0, Total=5112 [2022-12-14 09:38:23,688 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 150 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 258 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 333 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 258 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 09:38:23,689 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [150 Valid, 128 Invalid, 333 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 258 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 09:38:23,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2022-12-14 09:38:23,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 68. [2022-12-14 09:38:23,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.0298507462686568) internal successors, (69), 67 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:23,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 69 transitions. [2022-12-14 09:38:23,703 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 69 transitions. Word has length 66 [2022-12-14 09:38:23,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:38:23,703 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 69 transitions. [2022-12-14 09:38:23,703 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.2884615384615383) internal successors, (119), 52 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:23,703 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 69 transitions. [2022-12-14 09:38:23,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-12-14 09:38:23,704 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:38:23,704 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 15, 15, 1, 1, 1, 1, 1] [2022-12-14 09:38:23,708 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2022-12-14 09:38:23,904 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-12-14 09:38:23,905 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:38:23,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:38:23,906 INFO L85 PathProgramCache]: Analyzing trace with hash 1806474049, now seen corresponding path program 26 times [2022-12-14 09:38:23,907 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:38:23,907 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1659499373] [2022-12-14 09:38:23,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:38:23,908 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:38:23,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:38:24,822 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:24,822 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:38:24,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1659499373] [2022-12-14 09:38:24,823 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1659499373] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:38:24,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1094719189] [2022-12-14 09:38:24,823 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:38:24,823 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:38:24,823 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:38:24,824 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:38:24,824 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-12-14 09:38:25,731 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2022-12-14 09:38:25,731 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:38:25,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 113 conjunts are in the unsatisfiable core [2022-12-14 09:38:25,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:38:26,118 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 15 treesize of output 11 [2022-12-14 09:38:26,785 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 47 treesize of output 23 [2022-12-14 09:38:26,815 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:26,815 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:38:27,034 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:38:27,035 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:38:27,038 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:38:27,039 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:38:27,076 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:27,076 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1094719189] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:38:27,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [74331970] [2022-12-14 09:38:27,077 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:38:27,077 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:38:27,077 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:38:27,077 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:38:27,078 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:38:27,087 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:27,096 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:38:27,096 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:38:27,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:27,102 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:38:27,116 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:27,117 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:38:27,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:27,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:27,155 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:38:27,156 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:38:27,180 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:38:27,212 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:38:27,587 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11483#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:38:27,587 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:38:27,587 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:38:27,587 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 37, 37] total 70 [2022-12-14 09:38:27,587 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1769814441] [2022-12-14 09:38:27,587 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:38:27,588 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2022-12-14 09:38:27,588 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:38:27,588 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2022-12-14 09:38:27,589 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=5340, Unknown=0, NotChecked=0, Total=5550 [2022-12-14 09:38:27,589 INFO L87 Difference]: Start difference. First operand 68 states and 69 transitions. Second operand has 70 states, 70 states have (on average 1.9142857142857144) internal successors, (134), 70 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:28,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:38:28,785 INFO L93 Difference]: Finished difference Result 75 states and 76 transitions. [2022-12-14 09:38:28,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-12-14 09:38:28,785 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 1.9142857142857144) internal successors, (134), 70 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2022-12-14 09:38:28,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:38:28,786 INFO L225 Difference]: With dead ends: 75 [2022-12-14 09:38:28,786 INFO L226 Difference]: Without dead ends: 73 [2022-12-14 09:38:28,787 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 157 SyntacticMatches, 5 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1709 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=355, Invalid=8575, Unknown=0, NotChecked=0, Total=8930 [2022-12-14 09:38:28,787 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 29 mSDsluCounter, 738 mSDsCounter, 0 mSdLazyCounter, 2669 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 755 SdHoareTripleChecker+Invalid, 2687 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 2669 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-12-14 09:38:28,787 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 755 Invalid, 2687 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 2669 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-12-14 09:38:28,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-12-14 09:38:28,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2022-12-14 09:38:28,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 70 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:28,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2022-12-14 09:38:28,812 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 67 [2022-12-14 09:38:28,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:38:28,813 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2022-12-14 09:38:28,813 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 1.9142857142857144) internal successors, (134), 70 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:28,813 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2022-12-14 09:38:28,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-12-14 09:38:28,813 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:38:28,813 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 16, 1, 1, 1, 1, 1] [2022-12-14 09:38:28,818 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2022-12-14 09:38:29,014 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-12-14 09:38:29,015 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:38:29,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:38:29,015 INFO L85 PathProgramCache]: Analyzing trace with hash 732968348, now seen corresponding path program 27 times [2022-12-14 09:38:29,016 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:38:29,016 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [640195657] [2022-12-14 09:38:29,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:38:29,016 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:38:29,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:38:29,508 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 346 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:29,509 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:38:29,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [640195657] [2022-12-14 09:38:29,509 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [640195657] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:38:29,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [874883115] [2022-12-14 09:38:29,509 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:38:29,509 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:38:29,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:38:29,510 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:38:29,510 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-12-14 09:38:29,866 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:38:29,867 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:38:29,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 36 conjunts are in the unsatisfiable core [2022-12-14 09:38:29,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:38:30,324 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 392 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:30,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:38:30,605 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 392 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:30,605 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [874883115] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:38:30,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1889771551] [2022-12-14 09:38:30,606 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:38:30,606 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:38:30,606 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:38:30,606 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:38:30,606 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:38:30,614 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:30,622 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:38:30,622 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:38:30,628 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:30,629 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:38:30,639 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:30,639 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-12-14 09:38:30,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:30,669 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 09:38:30,683 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-12-14 09:38:30,684 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 202 [2022-12-14 09:38:30,714 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:38:30,743 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:38:31,033 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12212#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:38:31,033 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:38:31,034 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:38:31,034 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 55 [2022-12-14 09:38:31,034 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328649644] [2022-12-14 09:38:31,034 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:38:31,034 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-12-14 09:38:31,034 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:38:31,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-12-14 09:38:31,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=720, Invalid=2820, Unknown=0, NotChecked=0, Total=3540 [2022-12-14 09:38:31,035 INFO L87 Difference]: Start difference. First operand 71 states and 72 transitions. Second operand has 55 states, 55 states have (on average 2.290909090909091) internal successors, (126), 55 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:31,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:38:31,397 INFO L93 Difference]: Finished difference Result 132 states and 134 transitions. [2022-12-14 09:38:31,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-12-14 09:38:31,398 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.290909090909091) internal successors, (126), 55 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2022-12-14 09:38:31,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:38:31,399 INFO L225 Difference]: With dead ends: 132 [2022-12-14 09:38:31,399 INFO L226 Difference]: Without dead ends: 78 [2022-12-14 09:38:31,399 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 153 SyntacticMatches, 33 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2384 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1192, Invalid=4508, Unknown=0, NotChecked=0, Total=5700 [2022-12-14 09:38:31,399 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 192 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 232 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 192 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 328 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 232 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 09:38:31,400 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [192 Valid, 113 Invalid, 328 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 232 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 09:38:31,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-12-14 09:38:31,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 72. [2022-12-14 09:38:31,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 71 states have (on average 1.028169014084507) internal successors, (73), 71 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:31,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2022-12-14 09:38:31,416 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 70 [2022-12-14 09:38:31,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:38:31,416 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2022-12-14 09:38:31,416 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 2.290909090909091) internal successors, (126), 55 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:31,416 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2022-12-14 09:38:31,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-12-14 09:38:31,416 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:38:31,416 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 16, 16, 1, 1, 1, 1, 1] [2022-12-14 09:38:31,422 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2022-12-14 09:38:31,617 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-12-14 09:38:31,618 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:38:31,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:38:31,619 INFO L85 PathProgramCache]: Analyzing trace with hash -1513797246, now seen corresponding path program 28 times [2022-12-14 09:38:31,619 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:38:31,619 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [187194830] [2022-12-14 09:38:31,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:38:31,620 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:38:31,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:38:32,694 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 0 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:32,694 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:38:32,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [187194830] [2022-12-14 09:38:32,694 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [187194830] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:38:32,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1850724533] [2022-12-14 09:38:32,694 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:38:32,695 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:38:32,695 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:38:32,695 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:38:32,698 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-12-14 09:38:32,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:38:32,797 INFO L263 TraceCheckSpWp]: Trace formula consists of 366 conjuncts, 82 conjunts are in the unsatisfiable core [2022-12-14 09:38:32,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:38:33,426 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 09:38:34,335 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 0 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:34,335 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:38:34,495 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:38:34,496 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:38:34,503 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:38:34,504 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:38:34,548 INFO L134 CoverageAnalysis]: Checked inductivity of 545 backedges. 0 proven. 545 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:34,548 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1850724533] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:38:34,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1236199500] [2022-12-14 09:38:34,549 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:38:34,549 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:38:34,549 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:38:34,549 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:38:34,549 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:38:34,556 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:34,566 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:38:34,567 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:38:34,573 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:34,573 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:38:34,582 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:34,582 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-12-14 09:38:34,607 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:34,608 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 09:38:34,625 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-12-14 09:38:34,626 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 202 [2022-12-14 09:38:34,651 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:38:34,678 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:38:35,098 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13037#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:38:35,098 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:38:35,098 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:38:35,098 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 75 [2022-12-14 09:38:35,098 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1752928700] [2022-12-14 09:38:35,098 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:38:35,099 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2022-12-14 09:38:35,099 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:38:35,099 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2022-12-14 09:38:35,099 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=6082, Unknown=0, NotChecked=0, Total=6320 [2022-12-14 09:38:35,100 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand has 75 states, 75 states have (on average 1.92) internal successors, (144), 75 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:36,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:38:36,463 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2022-12-14 09:38:36,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2022-12-14 09:38:36,463 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 1.92) internal successors, (144), 75 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2022-12-14 09:38:36,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:38:36,463 INFO L225 Difference]: With dead ends: 79 [2022-12-14 09:38:36,463 INFO L226 Difference]: Without dead ends: 77 [2022-12-14 09:38:36,464 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 168 SyntacticMatches, 3 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1824 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=398, Invalid=9502, Unknown=0, NotChecked=0, Total=9900 [2022-12-14 09:38:36,464 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 30 mSDsluCounter, 896 mSDsCounter, 0 mSdLazyCounter, 2972 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 915 SdHoareTripleChecker+Invalid, 2990 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 2972 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-12-14 09:38:36,464 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 915 Invalid, 2990 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 2972 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-12-14 09:38:36,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-12-14 09:38:36,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 75. [2022-12-14 09:38:36,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.027027027027027) internal successors, (76), 74 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:36,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2022-12-14 09:38:36,481 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 71 [2022-12-14 09:38:36,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:38:36,481 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2022-12-14 09:38:36,481 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 75 states have (on average 1.92) internal successors, (144), 75 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:36,481 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2022-12-14 09:38:36,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-12-14 09:38:36,481 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:38:36,482 INFO L195 NwaCegarLoop]: trace histogram [18, 17, 17, 17, 1, 1, 1, 1, 1] [2022-12-14 09:38:36,486 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-12-14 09:38:36,682 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:38:36,683 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:38:36,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:38:36,684 INFO L85 PathProgramCache]: Analyzing trace with hash -372354117, now seen corresponding path program 29 times [2022-12-14 09:38:36,684 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:38:36,684 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1823617416] [2022-12-14 09:38:36,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:38:36,685 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:38:36,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:38:37,250 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 393 proven. 202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:37,251 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:38:37,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1823617416] [2022-12-14 09:38:37,251 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1823617416] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:38:37,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1231943851] [2022-12-14 09:38:37,251 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:38:37,251 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:38:37,251 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:38:37,252 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:38:37,252 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-12-14 09:38:39,189 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2022-12-14 09:38:39,189 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:38:39,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 376 conjuncts, 38 conjunts are in the unsatisfiable core [2022-12-14 09:38:39,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:38:39,662 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 442 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:39,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:38:39,968 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 442 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:39,968 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1231943851] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:38:39,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [822829395] [2022-12-14 09:38:39,969 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:38:39,969 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:38:39,969 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:38:39,969 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:38:39,969 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:38:39,979 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:39,986 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:38:39,986 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:38:39,990 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:39,991 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:38:40,000 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:40,000 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-12-14 09:38:40,026 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:40,026 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 09:38:40,040 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-12-14 09:38:40,040 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 202 [2022-12-14 09:38:40,069 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:38:40,097 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:38:40,352 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13805#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:38:40,352 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:38:40,352 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:38:40,352 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 58 [2022-12-14 09:38:40,352 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1880443917] [2022-12-14 09:38:40,352 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:38:40,352 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-12-14 09:38:40,352 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:38:40,353 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-12-14 09:38:40,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=797, Invalid=3109, Unknown=0, NotChecked=0, Total=3906 [2022-12-14 09:38:40,353 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand has 58 states, 58 states have (on average 2.293103448275862) internal successors, (133), 58 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:40,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:38:40,653 INFO L93 Difference]: Finished difference Result 139 states and 141 transitions. [2022-12-14 09:38:40,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-12-14 09:38:40,653 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.293103448275862) internal successors, (133), 58 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2022-12-14 09:38:40,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:38:40,653 INFO L225 Difference]: With dead ends: 139 [2022-12-14 09:38:40,653 INFO L226 Difference]: Without dead ends: 82 [2022-12-14 09:38:40,654 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 162 SyntacticMatches, 35 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2642 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1324, Invalid=4996, Unknown=0, NotChecked=0, Total=6320 [2022-12-14 09:38:40,654 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 272 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 304 mSolverCounterSat, 136 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 272 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 440 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 136 IncrementalHoareTripleChecker+Valid, 304 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 09:38:40,654 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [272 Valid, 151 Invalid, 440 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [136 Valid, 304 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 09:38:40,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2022-12-14 09:38:40,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 76. [2022-12-14 09:38:40,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 75 states have (on average 1.0266666666666666) internal successors, (77), 75 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:40,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 77 transitions. [2022-12-14 09:38:40,671 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 77 transitions. Word has length 74 [2022-12-14 09:38:40,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:38:40,672 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 77 transitions. [2022-12-14 09:38:40,672 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 2.293103448275862) internal successors, (133), 58 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:40,672 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 77 transitions. [2022-12-14 09:38:40,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-12-14 09:38:40,672 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:38:40,672 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 17, 17, 1, 1, 1, 1, 1] [2022-12-14 09:38:40,677 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2022-12-14 09:38:40,872 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2022-12-14 09:38:40,872 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:38:40,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:38:40,873 INFO L85 PathProgramCache]: Analyzing trace with hash 1774912673, now seen corresponding path program 30 times [2022-12-14 09:38:40,873 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:38:40,873 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1234200314] [2022-12-14 09:38:40,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:38:40,873 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:38:40,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:38:41,846 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 0 proven. 613 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:41,846 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:38:41,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1234200314] [2022-12-14 09:38:41,846 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1234200314] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:38:41,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1098332993] [2022-12-14 09:38:41,846 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:38:41,846 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:38:41,846 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:38:41,847 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:38:41,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-12-14 09:38:42,377 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:38:42,377 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:38:42,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 385 conjuncts, 91 conjunts are in the unsatisfiable core [2022-12-14 09:38:42,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:38:42,967 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 09:38:44,051 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 0 proven. 613 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:44,052 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:38:44,381 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:38:44,383 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:38:44,387 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:38:44,388 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:38:44,430 INFO L134 CoverageAnalysis]: Checked inductivity of 613 backedges. 0 proven. 613 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:44,431 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1098332993] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:38:44,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1364476799] [2022-12-14 09:38:44,432 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:38:44,432 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:38:44,432 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:38:44,432 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:38:44,432 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:38:44,440 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:44,454 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:38:44,455 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:38:44,460 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:44,460 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:38:44,471 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:44,471 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:38:44,499 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:44,500 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:44,509 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:38:44,510 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:38:44,539 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:38:44,581 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:38:46,362 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14678#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:38:46,362 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:38:46,362 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:38:46,362 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 41, 41] total 81 [2022-12-14 09:38:46,362 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [568467693] [2022-12-14 09:38:46,362 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:38:46,363 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 81 states [2022-12-14 09:38:46,363 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:38:46,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2022-12-14 09:38:46,364 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=262, Invalid=7048, Unknown=0, NotChecked=0, Total=7310 [2022-12-14 09:38:46,364 INFO L87 Difference]: Start difference. First operand 76 states and 77 transitions. Second operand has 81 states, 81 states have (on average 1.9012345679012346) internal successors, (154), 81 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:47,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:38:47,931 INFO L93 Difference]: Finished difference Result 83 states and 84 transitions. [2022-12-14 09:38:47,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2022-12-14 09:38:47,931 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 81 states have (on average 1.9012345679012346) internal successors, (154), 81 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2022-12-14 09:38:47,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:38:47,932 INFO L225 Difference]: With dead ends: 83 [2022-12-14 09:38:47,932 INFO L226 Difference]: Without dead ends: 81 [2022-12-14 09:38:47,932 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 158 SyntacticMatches, 21 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3155 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=464, Invalid=11526, Unknown=0, NotChecked=0, Total=11990 [2022-12-14 09:38:47,933 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 36 mSDsluCounter, 846 mSDsCounter, 0 mSdLazyCounter, 3051 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 865 SdHoareTripleChecker+Invalid, 3072 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 3051 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-12-14 09:38:47,933 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 865 Invalid, 3072 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 3051 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-12-14 09:38:47,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-12-14 09:38:47,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2022-12-14 09:38:47,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 78 states have (on average 1.0256410256410255) internal successors, (80), 78 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:47,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2022-12-14 09:38:47,962 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 75 [2022-12-14 09:38:47,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:38:47,962 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2022-12-14 09:38:47,962 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 81 states, 81 states have (on average 1.9012345679012346) internal successors, (154), 81 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:47,962 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2022-12-14 09:38:47,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2022-12-14 09:38:47,962 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:38:47,962 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 18, 18, 1, 1, 1, 1, 1] [2022-12-14 09:38:47,968 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2022-12-14 09:38:48,163 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2022-12-14 09:38:48,163 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:38:48,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:38:48,164 INFO L85 PathProgramCache]: Analyzing trace with hash 1085853756, now seen corresponding path program 31 times [2022-12-14 09:38:48,165 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:38:48,165 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1950172861] [2022-12-14 09:38:48,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:38:48,165 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:38:48,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:38:48,791 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 443 proven. 223 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:48,791 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:38:48,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1950172861] [2022-12-14 09:38:48,792 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1950172861] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:38:48,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1234365663] [2022-12-14 09:38:48,792 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:38:48,792 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:38:48,792 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:38:48,793 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:38:48,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-12-14 09:38:48,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:38:48,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 395 conjuncts, 40 conjunts are in the unsatisfiable core [2022-12-14 09:38:48,881 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:38:49,358 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 495 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:49,358 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:38:49,741 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 495 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:49,741 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1234365663] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:38:49,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1554193148] [2022-12-14 09:38:49,742 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:38:49,742 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:38:49,742 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:38:49,742 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:38:49,742 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:38:49,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:49,757 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:38:49,757 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:38:49,763 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:49,764 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:38:49,778 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:49,779 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:38:49,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:49,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:49,826 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:38:49,826 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:38:49,851 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:38:49,879 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:38:50,130 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15493#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:38:50,130 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:38:50,130 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:38:50,130 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 61 [2022-12-14 09:38:50,130 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192638949] [2022-12-14 09:38:50,130 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:38:50,131 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-12-14 09:38:50,131 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:38:50,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-12-14 09:38:50,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=878, Invalid=3412, Unknown=0, NotChecked=0, Total=4290 [2022-12-14 09:38:50,132 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand has 61 states, 61 states have (on average 2.2950819672131146) internal successors, (140), 61 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:50,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:38:50,419 INFO L93 Difference]: Finished difference Result 146 states and 148 transitions. [2022-12-14 09:38:50,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-12-14 09:38:50,420 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 2.2950819672131146) internal successors, (140), 61 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2022-12-14 09:38:50,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:38:50,420 INFO L225 Difference]: With dead ends: 146 [2022-12-14 09:38:50,420 INFO L226 Difference]: Without dead ends: 86 [2022-12-14 09:38:50,421 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 171 SyntacticMatches, 37 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2913 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1463, Invalid=5509, Unknown=0, NotChecked=0, Total=6972 [2022-12-14 09:38:50,421 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 186 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 336 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 169 SdHoareTripleChecker+Invalid, 429 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 336 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 09:38:50,421 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [186 Valid, 169 Invalid, 429 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 336 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 09:38:50,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-12-14 09:38:50,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 80. [2022-12-14 09:38:50,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.0253164556962024) internal successors, (81), 79 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:50,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 81 transitions. [2022-12-14 09:38:50,442 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 81 transitions. Word has length 78 [2022-12-14 09:38:50,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:38:50,442 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 81 transitions. [2022-12-14 09:38:50,443 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 2.2950819672131146) internal successors, (140), 61 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:50,443 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 81 transitions. [2022-12-14 09:38:50,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-12-14 09:38:50,443 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:38:50,443 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 18, 18, 1, 1, 1, 1, 1] [2022-12-14 09:38:50,447 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2022-12-14 09:38:50,644 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2022-12-14 09:38:50,644 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:38:50,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:38:50,645 INFO L85 PathProgramCache]: Analyzing trace with hash 528916002, now seen corresponding path program 32 times [2022-12-14 09:38:50,645 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:38:50,646 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [50677603] [2022-12-14 09:38:50,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:38:50,646 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:38:50,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:38:52,094 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 0 proven. 685 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:52,094 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:38:52,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [50677603] [2022-12-14 09:38:52,094 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [50677603] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:38:52,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [712623647] [2022-12-14 09:38:52,094 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:38:52,094 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:38:52,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:38:52,095 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:38:52,096 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-12-14 09:38:54,196 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2022-12-14 09:38:54,196 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:38:54,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 93 conjunts are in the unsatisfiable core [2022-12-14 09:38:54,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:38:54,251 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 15 treesize of output 11 [2022-12-14 09:38:55,303 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 47 treesize of output 23 [2022-12-14 09:38:55,336 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 0 proven. 685 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:55,336 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:38:55,605 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:38:55,606 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:38:55,609 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:38:55,611 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:38:55,649 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 0 proven. 685 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:55,649 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [712623647] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:38:55,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1385220183] [2022-12-14 09:38:55,650 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:38:55,650 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:38:55,650 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:38:55,651 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:38:55,651 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:38:55,657 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:55,665 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:38:55,665 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:38:55,670 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:55,678 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:38:55,679 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:38:55,689 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:55,689 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-12-14 09:38:55,712 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:38:55,713 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 09:38:55,727 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-12-14 09:38:55,727 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 202 [2022-12-14 09:38:55,767 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:38:55,795 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:38:56,147 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16391#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:38:56,147 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:38:56,147 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:38:56,147 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 43, 43] total 64 [2022-12-14 09:38:56,147 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1417389072] [2022-12-14 09:38:56,147 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:38:56,148 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-12-14 09:38:56,148 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:38:56,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-12-14 09:38:56,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=4503, Unknown=0, NotChecked=0, Total=4692 [2022-12-14 09:38:56,149 INFO L87 Difference]: Start difference. First operand 80 states and 81 transitions. Second operand has 64 states, 64 states have (on average 2.171875) internal successors, (139), 64 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:58,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:38:58,007 INFO L93 Difference]: Finished difference Result 87 states and 88 transitions. [2022-12-14 09:38:58,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-12-14 09:38:58,007 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.171875) internal successors, (139), 64 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 79 [2022-12-14 09:38:58,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:38:58,008 INFO L225 Difference]: With dead ends: 87 [2022-12-14 09:38:58,008 INFO L226 Difference]: Without dead ends: 85 [2022-12-14 09:38:58,008 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 205 SyntacticMatches, 5 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1135 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=355, Invalid=8017, Unknown=0, NotChecked=0, Total=8372 [2022-12-14 09:38:58,009 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 35 mSDsluCounter, 838 mSDsCounter, 0 mSdLazyCounter, 3058 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 858 SdHoareTripleChecker+Invalid, 3080 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 3058 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-12-14 09:38:58,009 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 858 Invalid, 3080 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 3058 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-12-14 09:38:58,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-12-14 09:38:58,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 83. [2022-12-14 09:38:58,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.024390243902439) internal successors, (84), 82 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:58,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 84 transitions. [2022-12-14 09:38:58,028 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 84 transitions. Word has length 79 [2022-12-14 09:38:58,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:38:58,028 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 84 transitions. [2022-12-14 09:38:58,029 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 2.171875) internal successors, (139), 64 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:38:58,029 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 84 transitions. [2022-12-14 09:38:58,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-12-14 09:38:58,029 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:38:58,029 INFO L195 NwaCegarLoop]: trace histogram [20, 19, 19, 19, 1, 1, 1, 1, 1] [2022-12-14 09:38:58,035 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2022-12-14 09:38:58,230 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-12-14 09:38:58,230 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:38:58,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:38:58,232 INFO L85 PathProgramCache]: Analyzing trace with hash -1293599973, now seen corresponding path program 33 times [2022-12-14 09:38:58,232 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:38:58,232 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [401480765] [2022-12-14 09:38:58,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:38:58,233 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:38:58,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:38:58,868 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 496 proven. 245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:38:58,869 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:38:58,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [401480765] [2022-12-14 09:38:58,869 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [401480765] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:38:58,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [305492623] [2022-12-14 09:38:58,869 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:38:58,869 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:38:58,869 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:38:58,870 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:38:58,871 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-12-14 09:38:59,478 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:38:59,478 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:38:59,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 414 conjuncts, 42 conjunts are in the unsatisfiable core [2022-12-14 09:38:59,483 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:39:00,030 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 551 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:39:00,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:39:00,370 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 551 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:39:00,370 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [305492623] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:39:00,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1088010053] [2022-12-14 09:39:00,371 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:39:00,371 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:39:00,371 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:39:00,372 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:39:00,372 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:39:00,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:00,390 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:39:00,390 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:39:00,397 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:00,408 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:39:00,408 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:39:00,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:00,419 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-12-14 09:39:00,445 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:00,445 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 09:39:00,463 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-12-14 09:39:00,463 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 202 [2022-12-14 09:39:00,509 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:39:00,546 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:39:00,831 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17243#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:39:00,831 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:39:00,831 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:39:00,831 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 64 [2022-12-14 09:39:00,831 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [658152244] [2022-12-14 09:39:00,831 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:39:00,831 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-12-14 09:39:00,831 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:39:00,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-12-14 09:39:00,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=963, Invalid=3729, Unknown=0, NotChecked=0, Total=4692 [2022-12-14 09:39:00,832 INFO L87 Difference]: Start difference. First operand 83 states and 84 transitions. Second operand has 64 states, 64 states have (on average 2.296875) internal successors, (147), 64 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:39:01,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:39:01,225 INFO L93 Difference]: Finished difference Result 153 states and 155 transitions. [2022-12-14 09:39:01,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-12-14 09:39:01,226 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.296875) internal successors, (147), 64 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2022-12-14 09:39:01,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:39:01,226 INFO L225 Difference]: With dead ends: 153 [2022-12-14 09:39:01,226 INFO L226 Difference]: Without dead ends: 90 [2022-12-14 09:39:01,227 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 180 SyntacticMatches, 39 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3197 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1609, Invalid=6047, Unknown=0, NotChecked=0, Total=7656 [2022-12-14 09:39:01,227 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 220 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 381 mSolverCounterSat, 110 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 220 SdHoareTripleChecker+Valid, 194 SdHoareTripleChecker+Invalid, 491 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 110 IncrementalHoareTripleChecker+Valid, 381 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 09:39:01,227 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [220 Valid, 194 Invalid, 491 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [110 Valid, 381 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 09:39:01,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-12-14 09:39:01,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 84. [2022-12-14 09:39:01,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 83 states have (on average 1.0240963855421688) internal successors, (85), 83 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:39:01,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 85 transitions. [2022-12-14 09:39:01,247 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 85 transitions. Word has length 82 [2022-12-14 09:39:01,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:39:01,247 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 85 transitions. [2022-12-14 09:39:01,247 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 2.296875) internal successors, (147), 64 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:39:01,247 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 85 transitions. [2022-12-14 09:39:01,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-12-14 09:39:01,247 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:39:01,247 INFO L195 NwaCegarLoop]: trace histogram [20, 20, 19, 19, 1, 1, 1, 1, 1] [2022-12-14 09:39:01,253 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2022-12-14 09:39:01,448 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-12-14 09:39:01,449 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:39:01,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:39:01,449 INFO L85 PathProgramCache]: Analyzing trace with hash -1196579327, now seen corresponding path program 34 times [2022-12-14 09:39:01,450 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:39:01,450 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1010051181] [2022-12-14 09:39:01,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:39:01,450 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:39:01,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:39:02,647 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 0 proven. 761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:39:02,647 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:39:02,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1010051181] [2022-12-14 09:39:02,647 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1010051181] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:39:02,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1148925451] [2022-12-14 09:39:02,647 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:39:02,647 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:39:02,647 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:39:02,648 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:39:02,649 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-12-14 09:39:02,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:39:02,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 134 conjunts are in the unsatisfiable core [2022-12-14 09:39:02,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:39:03,503 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 09:39:05,008 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 0 proven. 761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:39:05,008 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:39:05,288 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:39:05,289 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:39:05,292 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:39:05,298 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:39:05,354 INFO L134 CoverageAnalysis]: Checked inductivity of 761 backedges. 0 proven. 761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:39:05,355 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1148925451] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:39:05,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1227841346] [2022-12-14 09:39:05,356 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:39:05,356 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:39:05,356 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:39:05,356 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:39:05,356 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:39:05,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:05,376 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:39:05,376 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:39:05,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:05,382 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:39:05,392 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:05,393 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:39:05,415 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:05,416 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:05,425 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:39:05,426 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:39:05,446 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:39:05,474 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:39:06,040 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18206#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:39:06,040 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:39:06,041 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:39:06,041 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 87 [2022-12-14 09:39:06,041 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079793532] [2022-12-14 09:39:06,041 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:39:06,041 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2022-12-14 09:39:06,041 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:39:06,042 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2022-12-14 09:39:06,042 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=8098, Unknown=0, NotChecked=0, Total=8372 [2022-12-14 09:39:06,042 INFO L87 Difference]: Start difference. First operand 84 states and 85 transitions. Second operand has 87 states, 87 states have (on average 1.9310344827586208) internal successors, (168), 87 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:39:08,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:39:08,316 INFO L93 Difference]: Finished difference Result 91 states and 92 transitions. [2022-12-14 09:39:08,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2022-12-14 09:39:08,317 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 1.9310344827586208) internal successors, (168), 87 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2022-12-14 09:39:08,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:39:08,317 INFO L225 Difference]: With dead ends: 91 [2022-12-14 09:39:08,317 INFO L226 Difference]: Without dead ends: 89 [2022-12-14 09:39:08,318 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 198 SyntacticMatches, 3 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2409 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=458, Invalid=12652, Unknown=0, NotChecked=0, Total=13110 [2022-12-14 09:39:08,318 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 44 mSDsluCounter, 1296 mSDsCounter, 0 mSdLazyCounter, 4020 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 1318 SdHoareTripleChecker+Invalid, 4042 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 4020 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-12-14 09:39:08,318 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 1318 Invalid, 4042 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 4020 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-12-14 09:39:08,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-12-14 09:39:08,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 87. [2022-12-14 09:39:08,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 86 states have (on average 1.0232558139534884) internal successors, (88), 86 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:39:08,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2022-12-14 09:39:08,342 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 83 [2022-12-14 09:39:08,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:39:08,342 INFO L495 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2022-12-14 09:39:08,342 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 87 states have (on average 1.9310344827586208) internal successors, (168), 87 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:39:08,342 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2022-12-14 09:39:08,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2022-12-14 09:39:08,342 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:39:08,343 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 20, 1, 1, 1, 1, 1] [2022-12-14 09:39:08,347 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2022-12-14 09:39:08,543 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:39:08,544 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:39:08,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:39:08,545 INFO L85 PathProgramCache]: Analyzing trace with hash 938619612, now seen corresponding path program 35 times [2022-12-14 09:39:08,545 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:39:08,545 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [336609123] [2022-12-14 09:39:08,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:39:08,546 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:39:08,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:39:09,218 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 552 proven. 268 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:39:09,219 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:39:09,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [336609123] [2022-12-14 09:39:09,219 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [336609123] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:39:09,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1455492225] [2022-12-14 09:39:09,219 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:39:09,219 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:39:09,219 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:39:09,220 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:39:09,220 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-12-14 09:39:11,502 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2022-12-14 09:39:11,502 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:39:11,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 44 conjunts are in the unsatisfiable core [2022-12-14 09:39:11,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:39:12,071 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 610 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:39:12,071 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:39:12,488 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 610 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:39:12,488 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1455492225] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:39:12,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [595206194] [2022-12-14 09:39:12,489 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:39:12,489 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:39:12,489 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:39:12,489 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:39:12,489 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:39:12,498 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:12,507 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:39:12,507 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:39:12,514 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:12,523 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:39:12,523 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:39:12,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:12,537 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:39:12,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:12,561 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:12,570 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:39:12,570 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:39:12,595 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:39:12,640 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:39:13,759 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19097#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:39:13,759 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:39:13,759 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:39:13,759 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 67 [2022-12-14 09:39:13,759 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921079467] [2022-12-14 09:39:13,759 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:39:13,759 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2022-12-14 09:39:13,759 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:39:13,760 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2022-12-14 09:39:13,760 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1052, Invalid=4060, Unknown=0, NotChecked=0, Total=5112 [2022-12-14 09:39:13,760 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand has 67 states, 67 states have (on average 2.298507462686567) internal successors, (154), 67 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:39:14,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:39:14,130 INFO L93 Difference]: Finished difference Result 160 states and 162 transitions. [2022-12-14 09:39:14,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-12-14 09:39:14,131 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 2.298507462686567) internal successors, (154), 67 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2022-12-14 09:39:14,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:39:14,131 INFO L225 Difference]: With dead ends: 160 [2022-12-14 09:39:14,131 INFO L226 Difference]: Without dead ends: 94 [2022-12-14 09:39:14,132 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 168 SyntacticMatches, 62 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4878 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1762, Invalid=6610, Unknown=0, NotChecked=0, Total=8372 [2022-12-14 09:39:14,132 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 294 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 394 mSolverCounterSat, 147 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 294 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 541 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 147 IncrementalHoareTripleChecker+Valid, 394 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 09:39:14,132 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [294 Valid, 192 Invalid, 541 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [147 Valid, 394 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 09:39:14,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-12-14 09:39:14,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 88. [2022-12-14 09:39:14,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 87 states have (on average 1.0229885057471264) internal successors, (89), 87 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:39:14,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2022-12-14 09:39:14,154 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 86 [2022-12-14 09:39:14,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:39:14,154 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2022-12-14 09:39:14,154 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 2.298507462686567) internal successors, (154), 67 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:39:14,154 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2022-12-14 09:39:14,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-12-14 09:39:14,155 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:39:14,155 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 20, 20, 1, 1, 1, 1, 1] [2022-12-14 09:39:14,160 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2022-12-14 09:39:14,355 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-12-14 09:39:14,356 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:39:14,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:39:14,357 INFO L85 PathProgramCache]: Analyzing trace with hash -65094974, now seen corresponding path program 36 times [2022-12-14 09:39:14,357 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:39:14,357 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [741886846] [2022-12-14 09:39:14,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:39:14,358 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:39:14,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:39:16,212 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:39:16,212 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:39:16,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [741886846] [2022-12-14 09:39:16,212 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [741886846] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:39:16,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1520423405] [2022-12-14 09:39:16,212 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:39:16,212 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:39:16,212 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:39:16,213 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:39:16,214 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-12-14 09:39:17,046 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:39:17,046 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:39:17,051 INFO L263 TraceCheckSpWp]: Trace formula consists of 442 conjuncts, 101 conjunts are in the unsatisfiable core [2022-12-14 09:39:17,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:39:17,846 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 09:39:19,290 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:39:19,291 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:39:20,681 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:39:20,683 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:39:20,708 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:39:20,708 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1520423405] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:39:20,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1601188532] [2022-12-14 09:39:20,709 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:39:20,709 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:39:20,710 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:39:20,710 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:39:20,710 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:39:20,717 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:20,725 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:39:20,726 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:39:20,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:20,741 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:39:20,742 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:39:20,754 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:20,755 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-12-14 09:39:20,780 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:20,781 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 09:39:20,795 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-12-14 09:39:20,796 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 202 [2022-12-14 09:39:20,838 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:39:20,864 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:39:21,430 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20128#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:39:21,430 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:39:21,431 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:39:21,431 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 47, 47] total 113 [2022-12-14 09:39:21,431 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1911378543] [2022-12-14 09:39:21,431 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:39:21,431 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2022-12-14 09:39:21,432 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:39:21,432 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2022-12-14 09:39:21,433 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=339, Invalid=13467, Unknown=0, NotChecked=0, Total=13806 [2022-12-14 09:39:21,433 INFO L87 Difference]: Start difference. First operand 88 states and 89 transitions. Second operand has 113 states, 113 states have (on average 2.0707964601769913) internal successors, (234), 113 states have internal predecessors, (234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:39:27,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:39:27,076 INFO L93 Difference]: Finished difference Result 95 states and 96 transitions. [2022-12-14 09:39:27,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2022-12-14 09:39:27,077 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 113 states have (on average 2.0707964601769913) internal successors, (234), 113 states have internal predecessors, (234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 87 [2022-12-14 09:39:27,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:39:27,077 INFO L225 Difference]: With dead ends: 95 [2022-12-14 09:39:27,077 INFO L226 Difference]: Without dead ends: 93 [2022-12-14 09:39:27,078 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 351 GetRequests, 189 SyntacticMatches, 0 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3711 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=742, Invalid=25990, Unknown=0, NotChecked=0, Total=26732 [2022-12-14 09:39:27,078 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 103 mSDsluCounter, 1528 mSDsCounter, 0 mSdLazyCounter, 5384 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 1550 SdHoareTripleChecker+Invalid, 5408 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 5384 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-12-14 09:39:27,078 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 1550 Invalid, 5408 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 5384 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-12-14 09:39:27,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-12-14 09:39:27,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 91. [2022-12-14 09:39:27,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 90 states have (on average 1.0222222222222221) internal successors, (92), 90 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:39:27,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2022-12-14 09:39:27,102 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 87 [2022-12-14 09:39:27,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:39:27,102 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2022-12-14 09:39:27,102 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 113 states, 113 states have (on average 2.0707964601769913) internal successors, (234), 113 states have internal predecessors, (234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:39:27,102 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2022-12-14 09:39:27,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2022-12-14 09:39:27,102 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:39:27,103 INFO L195 NwaCegarLoop]: trace histogram [22, 21, 21, 21, 1, 1, 1, 1, 1] [2022-12-14 09:39:27,108 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2022-12-14 09:39:27,303 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-12-14 09:39:27,304 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:39:27,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:39:27,305 INFO L85 PathProgramCache]: Analyzing trace with hash 2085640827, now seen corresponding path program 37 times [2022-12-14 09:39:27,305 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:39:27,306 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1497273717] [2022-12-14 09:39:27,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:39:27,306 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:39:27,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:39:28,086 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 611 proven. 292 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:39:28,086 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:39:28,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1497273717] [2022-12-14 09:39:28,086 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1497273717] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:39:28,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [643693175] [2022-12-14 09:39:28,086 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:39:28,086 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:39:28,086 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:39:28,087 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:39:28,088 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-12-14 09:39:28,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:39:28,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 452 conjuncts, 46 conjunts are in the unsatisfiable core [2022-12-14 09:39:28,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:39:28,766 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 672 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:39:28,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:39:29,205 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 672 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:39:29,205 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [643693175] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:39:29,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [445530706] [2022-12-14 09:39:29,206 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:39:29,206 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:39:29,206 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:39:29,207 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:39:29,207 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:39:29,217 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:29,227 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:39:29,227 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:39:29,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:29,232 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:39:29,241 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:29,242 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-12-14 09:39:29,265 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:29,266 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 09:39:29,279 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-12-14 09:39:29,280 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 202 [2022-12-14 09:39:29,329 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:39:29,362 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:39:29,685 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21104#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:39:29,685 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:39:29,685 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:39:29,685 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 70 [2022-12-14 09:39:29,685 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2008265247] [2022-12-14 09:39:29,686 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:39:29,686 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2022-12-14 09:39:29,686 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:39:29,686 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2022-12-14 09:39:29,687 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1145, Invalid=4405, Unknown=0, NotChecked=0, Total=5550 [2022-12-14 09:39:29,687 INFO L87 Difference]: Start difference. First operand 91 states and 92 transitions. Second operand has 70 states, 70 states have (on average 2.3) internal successors, (161), 70 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:39:30,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:39:30,147 INFO L93 Difference]: Finished difference Result 167 states and 169 transitions. [2022-12-14 09:39:30,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-12-14 09:39:30,147 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 2.3) internal successors, (161), 70 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 90 [2022-12-14 09:39:30,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:39:30,148 INFO L225 Difference]: With dead ends: 167 [2022-12-14 09:39:30,148 INFO L226 Difference]: Without dead ends: 98 [2022-12-14 09:39:30,149 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 198 SyntacticMatches, 43 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3804 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1922, Invalid=7198, Unknown=0, NotChecked=0, Total=9120 [2022-12-14 09:39:30,149 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 222 mSDsluCounter, 219 mSDsCounter, 0 mSdLazyCounter, 488 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 222 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 599 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 488 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 09:39:30,149 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [222 Valid, 243 Invalid, 599 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [111 Valid, 488 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 09:39:30,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-12-14 09:39:30,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 92. [2022-12-14 09:39:30,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 91 states have (on average 1.021978021978022) internal successors, (93), 91 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:39:30,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 93 transitions. [2022-12-14 09:39:30,178 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 93 transitions. Word has length 90 [2022-12-14 09:39:30,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:39:30,178 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 93 transitions. [2022-12-14 09:39:30,178 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 2.3) internal successors, (161), 70 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:39:30,178 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 93 transitions. [2022-12-14 09:39:30,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-12-14 09:39:30,179 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:39:30,179 INFO L195 NwaCegarLoop]: trace histogram [22, 22, 21, 21, 1, 1, 1, 1, 1] [2022-12-14 09:39:30,183 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2022-12-14 09:39:30,379 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-12-14 09:39:30,380 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:39:30,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:39:30,381 INFO L85 PathProgramCache]: Analyzing trace with hash -980779167, now seen corresponding path program 38 times [2022-12-14 09:39:30,381 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:39:30,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1012435479] [2022-12-14 09:39:30,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:39:30,382 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:39:30,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:39:31,942 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 0 proven. 925 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:39:31,942 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:39:31,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1012435479] [2022-12-14 09:39:31,942 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1012435479] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:39:31,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [730545178] [2022-12-14 09:39:31,942 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:39:31,942 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:39:31,942 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:39:31,943 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:39:31,944 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-12-14 09:39:36,289 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2022-12-14 09:39:36,289 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:39:36,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 461 conjuncts, 125 conjunts are in the unsatisfiable core [2022-12-14 09:39:36,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:39:37,376 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 09:39:39,063 INFO L321 Elim1Store]: treesize reduction 7, result has 30.0 percent of original size [2022-12-14 09:39:39,063 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 23 [2022-12-14 09:39:39,105 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 651 proven. 274 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:39:39,105 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:39:41,535 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 18 treesize of output 16 [2022-12-14 09:39:41,538 INFO L350 Elim1Store]: Elim1 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 30 treesize of output 24 [2022-12-14 09:39:43,326 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 630 proven. 295 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:39:43,327 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [730545178] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:39:43,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [333508591] [2022-12-14 09:39:43,328 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:39:43,328 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:39:43,328 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:39:43,328 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:39:43,328 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:39:43,337 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:43,347 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:39:43,347 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:39:43,355 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:43,367 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:39:43,368 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:39:43,387 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:43,388 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:39:43,413 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:43,415 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:43,426 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:39:43,426 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:39:43,456 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:39:43,490 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:39:46,092 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22203#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:39:46,092 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:39:46,092 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:39:46,092 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 139 [2022-12-14 09:39:46,092 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [414398816] [2022-12-14 09:39:46,092 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:39:46,093 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 139 states [2022-12-14 09:39:46,093 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:39:46,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 139 interpolants. [2022-12-14 09:39:46,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1588, Invalid=19004, Unknown=0, NotChecked=0, Total=20592 [2022-12-14 09:39:46,094 INFO L87 Difference]: Start difference. First operand 92 states and 93 transitions. Second operand has 139 states, 139 states have (on average 1.9280575539568345) internal successors, (268), 139 states have internal predecessors, (268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:39:53,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:39:53,226 INFO L93 Difference]: Finished difference Result 167 states and 170 transitions. [2022-12-14 09:39:53,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2022-12-14 09:39:53,226 INFO L78 Accepts]: Start accepts. Automaton has has 139 states, 139 states have (on average 1.9280575539568345) internal successors, (268), 139 states have internal predecessors, (268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 91 [2022-12-14 09:39:53,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:39:53,227 INFO L225 Difference]: With dead ends: 167 [2022-12-14 09:39:53,227 INFO L226 Difference]: Without dead ends: 98 [2022-12-14 09:39:53,229 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 418 GetRequests, 155 SyntacticMatches, 22 SemanticMatches, 241 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17446 ImplicationChecksByTransitivity, 15.1s TimeCoverageRelationStatistics Valid=4238, Invalid=54568, Unknown=0, NotChecked=0, Total=58806 [2022-12-14 09:39:53,229 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 287 mSDsluCounter, 1374 mSDsCounter, 0 mSdLazyCounter, 4488 mSolverCounterSat, 133 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 287 SdHoareTripleChecker+Valid, 1398 SdHoareTripleChecker+Invalid, 4621 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 133 IncrementalHoareTripleChecker+Valid, 4488 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-12-14 09:39:53,229 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [287 Valid, 1398 Invalid, 4621 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [133 Valid, 4488 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-12-14 09:39:53,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-12-14 09:39:53,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 96. [2022-12-14 09:39:53,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 95 states have (on average 1.0210526315789474) internal successors, (97), 95 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:39:53,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 97 transitions. [2022-12-14 09:39:53,255 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 97 transitions. Word has length 91 [2022-12-14 09:39:53,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:39:53,255 INFO L495 AbstractCegarLoop]: Abstraction has 96 states and 97 transitions. [2022-12-14 09:39:53,256 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 139 states, 139 states have (on average 1.9280575539568345) internal successors, (268), 139 states have internal predecessors, (268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:39:53,256 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 97 transitions. [2022-12-14 09:39:53,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-12-14 09:39:53,256 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:39:53,256 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 22, 22, 1, 1, 1, 1, 1] [2022-12-14 09:39:53,263 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-12-14 09:39:53,456 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-12-14 09:39:53,457 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:39:53,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:39:53,458 INFO L85 PathProgramCache]: Analyzing trace with hash 882351970, now seen corresponding path program 39 times [2022-12-14 09:39:53,458 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:39:53,458 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [997478464] [2022-12-14 09:39:53,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:39:53,459 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:39:53,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:39:55,135 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 0 proven. 1013 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:39:55,136 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:39:55,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [997478464] [2022-12-14 09:39:55,136 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [997478464] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:39:55,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [918663653] [2022-12-14 09:39:55,136 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:39:55,136 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:39:55,136 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:39:55,137 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:39:55,137 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-12-14 09:39:55,783 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:39:55,783 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:39:55,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 480 conjuncts, 111 conjunts are in the unsatisfiable core [2022-12-14 09:39:55,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:39:56,706 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 09:39:58,349 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 0 proven. 1013 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:39:58,350 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:39:58,708 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:39:58,709 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:39:58,712 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:39:58,713 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:39:58,770 INFO L134 CoverageAnalysis]: Checked inductivity of 1013 backedges. 0 proven. 1013 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:39:58,771 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [918663653] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:39:58,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [839216305] [2022-12-14 09:39:58,771 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:39:58,772 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:39:58,772 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:39:58,772 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:39:58,772 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:39:58,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:58,787 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:39:58,787 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:39:58,793 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:58,803 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:39:58,803 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:39:58,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:58,823 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-12-14 09:39:58,847 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:39:58,847 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 09:39:58,862 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-12-14 09:39:58,863 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 202 [2022-12-14 09:39:58,904 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:39:58,933 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:39:59,477 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23452#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:39:59,477 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:39:59,477 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:39:59,477 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 51, 51] total 101 [2022-12-14 09:39:59,477 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1388577050] [2022-12-14 09:39:59,477 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:39:59,477 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2022-12-14 09:39:59,477 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:39:59,478 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2022-12-14 09:39:59,478 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=10806, Unknown=0, NotChecked=0, Total=11130 [2022-12-14 09:39:59,478 INFO L87 Difference]: Start difference. First operand 96 states and 97 transitions. Second operand has 101 states, 101 states have (on average 1.900990099009901) internal successors, (192), 101 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:40:01,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:40:01,689 INFO L93 Difference]: Finished difference Result 103 states and 104 transitions. [2022-12-14 09:40:01,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2022-12-14 09:40:01,689 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 1.900990099009901) internal successors, (192), 101 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 95 [2022-12-14 09:40:01,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:40:01,689 INFO L225 Difference]: With dead ends: 103 [2022-12-14 09:40:01,689 INFO L226 Difference]: Without dead ends: 101 [2022-12-14 09:40:01,690 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 226 SyntacticMatches, 3 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3394 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=555, Invalid=17267, Unknown=0, NotChecked=0, Total=17822 [2022-12-14 09:40:01,690 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 52 mSDsluCounter, 1514 mSDsCounter, 0 mSdLazyCounter, 5013 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 1538 SdHoareTripleChecker+Invalid, 5040 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 5013 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-12-14 09:40:01,690 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 1538 Invalid, 5040 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 5013 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-12-14 09:40:01,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-12-14 09:40:01,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 99. [2022-12-14 09:40:01,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 98 states have (on average 1.0204081632653061) internal successors, (100), 98 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:40:01,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 100 transitions. [2022-12-14 09:40:01,718 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 100 transitions. Word has length 95 [2022-12-14 09:40:01,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:40:01,718 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 100 transitions. [2022-12-14 09:40:01,718 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 1.900990099009901) internal successors, (192), 101 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:40:01,719 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 100 transitions. [2022-12-14 09:40:01,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-12-14 09:40:01,719 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:40:01,719 INFO L195 NwaCegarLoop]: trace histogram [24, 23, 23, 23, 1, 1, 1, 1, 1] [2022-12-14 09:40:01,725 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Ended with exit code 0 [2022-12-14 09:40:01,919 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:40:01,920 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:40:01,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:40:01,920 INFO L85 PathProgramCache]: Analyzing trace with hash 952480219, now seen corresponding path program 40 times [2022-12-14 09:40:01,920 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:40:01,920 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1480880207] [2022-12-14 09:40:01,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:40:01,920 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:40:01,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:40:02,701 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 738 proven. 343 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:40:02,701 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:40:02,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1480880207] [2022-12-14 09:40:02,701 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1480880207] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:40:02,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1636212038] [2022-12-14 09:40:02,701 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:40:02,701 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:40:02,701 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:40:02,702 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:40:02,703 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-12-14 09:40:02,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:40:02,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 490 conjuncts, 50 conjunts are in the unsatisfiable core [2022-12-14 09:40:02,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:40:03,574 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 805 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:40:03,575 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:40:04,253 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 805 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:40:04,253 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1636212038] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:40:04,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1694616797] [2022-12-14 09:40:04,254 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:40:04,255 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:40:04,255 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:40:04,255 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:40:04,255 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:40:04,264 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:40:04,276 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:40:04,276 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:40:04,283 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:40:04,296 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:40:04,296 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:40:04,311 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:40:04,311 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-12-14 09:40:04,337 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:40:04,337 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 09:40:04,358 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-12-14 09:40:04,358 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 202 [2022-12-14 09:40:04,405 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:40:04,435 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:40:04,844 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24470#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:40:04,844 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:40:04,844 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:40:04,844 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 76 [2022-12-14 09:40:04,844 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1434217320] [2022-12-14 09:40:04,844 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:40:04,844 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2022-12-14 09:40:04,844 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:40:04,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2022-12-14 09:40:04,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1343, Invalid=5137, Unknown=0, NotChecked=0, Total=6480 [2022-12-14 09:40:04,845 INFO L87 Difference]: Start difference. First operand 99 states and 100 transitions. Second operand has 76 states, 76 states have (on average 2.3026315789473686) internal successors, (175), 76 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:40:05,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:40:05,365 INFO L93 Difference]: Finished difference Result 181 states and 183 transitions. [2022-12-14 09:40:05,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-12-14 09:40:05,365 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 2.3026315789473686) internal successors, (175), 76 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 98 [2022-12-14 09:40:05,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:40:05,366 INFO L225 Difference]: With dead ends: 181 [2022-12-14 09:40:05,366 INFO L226 Difference]: Without dead ends: 106 [2022-12-14 09:40:05,367 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 365 GetRequests, 216 SyntacticMatches, 47 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4463 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2263, Invalid=8449, Unknown=0, NotChecked=0, Total=10712 [2022-12-14 09:40:05,367 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 284 mSDsluCounter, 211 mSDsCounter, 0 mSdLazyCounter, 482 mSolverCounterSat, 142 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 284 SdHoareTripleChecker+Valid, 237 SdHoareTripleChecker+Invalid, 624 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 142 IncrementalHoareTripleChecker+Valid, 482 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 09:40:05,367 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [284 Valid, 237 Invalid, 624 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [142 Valid, 482 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 09:40:05,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-12-14 09:40:05,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 100. [2022-12-14 09:40:05,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 99 states have (on average 1.02020202020202) internal successors, (101), 99 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:40:05,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 101 transitions. [2022-12-14 09:40:05,401 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 101 transitions. Word has length 98 [2022-12-14 09:40:05,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:40:05,401 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 101 transitions. [2022-12-14 09:40:05,401 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 76 states have (on average 2.3026315789473686) internal successors, (175), 76 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:40:05,402 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 101 transitions. [2022-12-14 09:40:05,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2022-12-14 09:40:05,402 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:40:05,402 INFO L195 NwaCegarLoop]: trace histogram [24, 24, 23, 23, 1, 1, 1, 1, 1] [2022-12-14 09:40:05,407 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Ended with exit code 0 [2022-12-14 09:40:05,603 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2022-12-14 09:40:05,603 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:40:05,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:40:05,604 INFO L85 PathProgramCache]: Analyzing trace with hash 2098696385, now seen corresponding path program 41 times [2022-12-14 09:40:05,605 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:40:05,605 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [760212120] [2022-12-14 09:40:05,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:40:05,606 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:40:05,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:40:07,429 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 0 proven. 1105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:40:07,429 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:40:07,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [760212120] [2022-12-14 09:40:07,429 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [760212120] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:40:07,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1939413246] [2022-12-14 09:40:07,429 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:40:07,429 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:40:07,429 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:40:07,430 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:40:07,431 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-12-14 09:40:11,892 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2022-12-14 09:40:11,892 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:40:11,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 499 conjuncts, 111 conjunts are in the unsatisfiable core [2022-12-14 09:40:11,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:40:12,975 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 09:40:14,621 INFO L321 Elim1Store]: treesize reduction 7, result has 30.0 percent of original size [2022-12-14 09:40:14,621 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 23 [2022-12-14 09:40:14,669 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 782 proven. 323 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:40:14,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:40:17,316 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 18 treesize of output 16 [2022-12-14 09:40:17,318 INFO L350 Elim1Store]: Elim1 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 30 treesize of output 24 [2022-12-14 09:40:19,426 INFO L134 CoverageAnalysis]: Checked inductivity of 1105 backedges. 759 proven. 346 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:40:19,426 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1939413246] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:40:19,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [606182602] [2022-12-14 09:40:19,427 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:40:19,427 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:40:19,427 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:40:19,427 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:40:19,427 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:40:19,434 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:40:19,441 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:40:19,442 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:40:19,447 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:40:19,456 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:40:19,456 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:40:19,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:40:19,470 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-12-14 09:40:19,494 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:40:19,494 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 09:40:19,508 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-12-14 09:40:19,508 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 202 [2022-12-14 09:40:19,533 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:40:19,563 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:40:20,128 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25665#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:40:20,129 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:40:20,129 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:40:20,129 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 151 [2022-12-14 09:40:20,129 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050257093] [2022-12-14 09:40:20,129 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:40:20,129 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 151 states [2022-12-14 09:40:20,129 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:40:20,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 151 interpolants. [2022-12-14 09:40:20,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1849, Invalid=22331, Unknown=0, NotChecked=0, Total=24180 [2022-12-14 09:40:20,131 INFO L87 Difference]: Start difference. First operand 100 states and 101 transitions. Second operand has 151 states, 151 states have (on average 1.9337748344370862) internal successors, (292), 151 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:40:27,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:40:27,991 INFO L93 Difference]: Finished difference Result 181 states and 184 transitions. [2022-12-14 09:40:27,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 137 states. [2022-12-14 09:40:27,992 INFO L78 Accepts]: Start accepts. Automaton has has 151 states, 151 states have (on average 1.9337748344370862) internal successors, (292), 151 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 99 [2022-12-14 09:40:27,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:40:27,992 INFO L225 Difference]: With dead ends: 181 [2022-12-14 09:40:27,992 INFO L226 Difference]: Without dead ends: 106 [2022-12-14 09:40:27,995 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 455 GetRequests, 193 SyntacticMatches, 0 SemanticMatches, 262 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17580 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=4920, Invalid=64512, Unknown=0, NotChecked=0, Total=69432 [2022-12-14 09:40:27,995 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 362 mSDsluCounter, 1491 mSDsCounter, 0 mSdLazyCounter, 4853 mSolverCounterSat, 175 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 362 SdHoareTripleChecker+Valid, 1517 SdHoareTripleChecker+Invalid, 5028 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 175 IncrementalHoareTripleChecker+Valid, 4853 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-12-14 09:40:27,995 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [362 Valid, 1517 Invalid, 5028 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [175 Valid, 4853 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-12-14 09:40:27,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-12-14 09:40:28,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 104. [2022-12-14 09:40:28,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 103 states have (on average 1.0194174757281553) internal successors, (105), 103 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:40:28,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 105 transitions. [2022-12-14 09:40:28,025 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 105 transitions. Word has length 99 [2022-12-14 09:40:28,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:40:28,025 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 105 transitions. [2022-12-14 09:40:28,026 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 151 states, 151 states have (on average 1.9337748344370862) internal successors, (292), 151 states have internal predecessors, (292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:40:28,026 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 105 transitions. [2022-12-14 09:40:28,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-12-14 09:40:28,026 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:40:28,026 INFO L195 NwaCegarLoop]: trace histogram [25, 25, 24, 24, 1, 1, 1, 1, 1] [2022-12-14 09:40:28,033 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2022-12-14 09:40:28,227 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2022-12-14 09:40:28,227 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:40:28,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:40:28,228 INFO L85 PathProgramCache]: Analyzing trace with hash 310070274, now seen corresponding path program 42 times [2022-12-14 09:40:28,228 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:40:28,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [10963854] [2022-12-14 09:40:28,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:40:28,229 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:40:28,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:40:30,196 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 0 proven. 1201 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:40:30,196 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:40:30,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [10963854] [2022-12-14 09:40:30,196 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [10963854] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:40:30,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [409178849] [2022-12-14 09:40:30,196 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:40:30,196 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:40:30,196 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:40:30,197 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:40:30,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-12-14 09:40:33,272 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:40:33,272 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:40:33,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 117 conjunts are in the unsatisfiable core [2022-12-14 09:40:33,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:40:33,327 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 15 treesize of output 11 [2022-12-14 09:40:34,965 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 47 treesize of output 23 [2022-12-14 09:40:35,005 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 0 proven. 1201 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:40:35,005 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:40:35,300 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:40:35,301 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:40:35,304 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:40:35,305 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:40:35,375 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 0 proven. 1201 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:40:35,375 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [409178849] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:40:35,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [215243898] [2022-12-14 09:40:35,375 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:40:35,376 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:40:35,376 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:40:35,376 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:40:35,376 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:40:35,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:40:35,394 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:40:35,394 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:40:35,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:40:35,399 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:40:35,409 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:40:35,410 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-12-14 09:40:35,436 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:40:35,436 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 09:40:35,454 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-12-14 09:40:35,454 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 202 [2022-12-14 09:40:35,495 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:40:35,523 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:40:36,034 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26993#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:40:36,034 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:40:36,034 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:40:36,034 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 55, 55] total 82 [2022-12-14 09:40:36,034 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1106418854] [2022-12-14 09:40:36,034 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:40:36,035 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2022-12-14 09:40:36,035 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:40:36,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2022-12-14 09:40:36,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=7245, Unknown=0, NotChecked=0, Total=7482 [2022-12-14 09:40:36,035 INFO L87 Difference]: Start difference. First operand 104 states and 105 transitions. Second operand has 82 states, 82 states have (on average 2.207317073170732) internal successors, (181), 82 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:40:38,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:40:38,975 INFO L93 Difference]: Finished difference Result 111 states and 112 transitions. [2022-12-14 09:40:38,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2022-12-14 09:40:38,975 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 2.207317073170732) internal successors, (181), 82 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 103 [2022-12-14 09:40:38,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:40:38,976 INFO L225 Difference]: With dead ends: 111 [2022-12-14 09:40:38,976 INFO L226 Difference]: Without dead ends: 109 [2022-12-14 09:40:38,977 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 271 SyntacticMatches, 5 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1834 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=453, Invalid=13119, Unknown=0, NotChecked=0, Total=13572 [2022-12-14 09:40:38,977 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 38 mSDsluCounter, 1617 mSDsCounter, 0 mSdLazyCounter, 5441 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 1643 SdHoareTripleChecker+Invalid, 5468 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 5441 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-12-14 09:40:38,977 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 1643 Invalid, 5468 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 5441 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-12-14 09:40:38,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2022-12-14 09:40:39,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 107. [2022-12-14 09:40:39,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 106 states have (on average 1.0188679245283019) internal successors, (108), 106 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:40:39,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 108 transitions. [2022-12-14 09:40:39,011 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 108 transitions. Word has length 103 [2022-12-14 09:40:39,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:40:39,012 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 108 transitions. [2022-12-14 09:40:39,012 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 82 states have (on average 2.207317073170732) internal successors, (181), 82 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:40:39,012 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 108 transitions. [2022-12-14 09:40:39,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2022-12-14 09:40:39,012 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:40:39,012 INFO L195 NwaCegarLoop]: trace histogram [26, 25, 25, 25, 1, 1, 1, 1, 1] [2022-12-14 09:40:39,021 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Ended with exit code 0 [2022-12-14 09:40:39,213 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2022-12-14 09:40:39,213 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:40:39,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:40:39,214 INFO L85 PathProgramCache]: Analyzing trace with hash -1166327493, now seen corresponding path program 43 times [2022-12-14 09:40:39,214 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:40:39,215 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [14580278] [2022-12-14 09:40:39,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:40:39,215 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:40:39,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:40:40,217 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 877 proven. 398 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:40:40,217 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:40:40,217 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [14580278] [2022-12-14 09:40:40,217 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [14580278] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:40:40,217 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1573718846] [2022-12-14 09:40:40,217 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:40:40,217 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:40:40,218 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:40:40,218 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:40:40,219 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-12-14 09:40:40,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:40:40,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 528 conjuncts, 54 conjunts are in the unsatisfiable core [2022-12-14 09:40:40,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:40:41,285 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 950 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:40:41,286 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:40:41,842 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 950 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:40:41,842 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1573718846] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:40:41,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [901294513] [2022-12-14 09:40:41,843 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:40:41,843 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:40:41,843 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:40:41,844 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:40:41,844 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:40:41,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:40:41,861 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:40:41,862 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:40:41,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:40:41,868 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:40:41,880 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:40:41,881 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:40:41,908 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:40:41,910 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:40:41,920 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:40:41,920 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:40:41,949 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:40:41,982 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:40:43,366 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28093#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:40:43,366 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:40:43,366 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:40:43,366 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 82 [2022-12-14 09:40:43,366 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1664003494] [2022-12-14 09:40:43,366 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:40:43,366 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2022-12-14 09:40:43,366 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:40:43,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2022-12-14 09:40:43,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1557, Invalid=5925, Unknown=0, NotChecked=0, Total=7482 [2022-12-14 09:40:43,367 INFO L87 Difference]: Start difference. First operand 107 states and 108 transitions. Second operand has 82 states, 82 states have (on average 2.3048780487804876) internal successors, (189), 82 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:40:43,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:40:43,910 INFO L93 Difference]: Finished difference Result 195 states and 197 transitions. [2022-12-14 09:40:43,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-12-14 09:40:43,910 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 2.3048780487804876) internal successors, (189), 82 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 106 [2022-12-14 09:40:43,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:40:43,911 INFO L225 Difference]: With dead ends: 195 [2022-12-14 09:40:43,911 INFO L226 Difference]: Without dead ends: 114 [2022-12-14 09:40:43,912 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 208 SyntacticMatches, 77 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7278 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=2632, Invalid=9800, Unknown=0, NotChecked=0, Total=12432 [2022-12-14 09:40:43,912 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 282 mSDsluCounter, 211 mSDsCounter, 0 mSdLazyCounter, 477 mSolverCounterSat, 141 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 282 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 618 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 141 IncrementalHoareTripleChecker+Valid, 477 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 09:40:43,912 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [282 Valid, 239 Invalid, 618 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [141 Valid, 477 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 09:40:43,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2022-12-14 09:40:43,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 108. [2022-12-14 09:40:43,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 107 states have (on average 1.0186915887850467) internal successors, (109), 107 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:40:43,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 109 transitions. [2022-12-14 09:40:43,944 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 109 transitions. Word has length 106 [2022-12-14 09:40:43,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:40:43,945 INFO L495 AbstractCegarLoop]: Abstraction has 108 states and 109 transitions. [2022-12-14 09:40:43,945 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 82 states have (on average 2.3048780487804876) internal successors, (189), 82 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:40:43,945 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 109 transitions. [2022-12-14 09:40:43,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2022-12-14 09:40:43,945 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:40:43,945 INFO L195 NwaCegarLoop]: trace histogram [26, 26, 25, 25, 1, 1, 1, 1, 1] [2022-12-14 09:40:43,950 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Ended with exit code 0 [2022-12-14 09:40:44,146 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2022-12-14 09:40:44,146 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:40:44,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:40:44,146 INFO L85 PathProgramCache]: Analyzing trace with hash -1416963551, now seen corresponding path program 44 times [2022-12-14 09:40:44,146 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:40:44,146 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1705933345] [2022-12-14 09:40:44,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:40:44,147 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:40:44,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:40:46,021 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:40:46,021 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:40:46,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1705933345] [2022-12-14 09:40:46,021 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1705933345] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:40:46,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [815323614] [2022-12-14 09:40:46,021 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:40:46,021 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:40:46,021 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:40:46,022 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:40:46,023 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-12-14 09:40:53,626 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2022-12-14 09:40:53,626 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:40:53,638 INFO L263 TraceCheckSpWp]: Trace formula consists of 537 conjuncts, 145 conjunts are in the unsatisfiable core [2022-12-14 09:40:53,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:40:55,055 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 09:40:57,068 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:40:57,068 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:40:59,929 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:40:59,930 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:41:01,960 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:41:01,960 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [815323614] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:41:01,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1989410644] [2022-12-14 09:41:01,961 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:41:01,961 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:41:01,961 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:41:01,961 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:41:01,961 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:41:01,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:41:01,977 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:41:01,978 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:41:01,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:41:01,984 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:41:01,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:41:01,995 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-12-14 09:41:02,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:41:02,020 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 09:41:02,037 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-12-14 09:41:02,037 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 202 [2022-12-14 09:41:02,066 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:41:02,099 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:41:02,911 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29384#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:41:02,911 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:41:02,911 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:41:02,911 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 163 [2022-12-14 09:41:02,911 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784094244] [2022-12-14 09:41:02,911 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:41:02,911 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 163 states [2022-12-14 09:41:02,912 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:41:02,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 163 interpolants. [2022-12-14 09:41:02,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1609, Invalid=26447, Unknown=0, NotChecked=0, Total=28056 [2022-12-14 09:41:02,914 INFO L87 Difference]: Start difference. First operand 108 states and 109 transitions. Second operand has 163 states, 163 states have (on average 1.9386503067484662) internal successors, (316), 163 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:41:27,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:41:27,387 INFO L93 Difference]: Finished difference Result 270 states and 298 transitions. [2022-12-14 09:41:27,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 187 states. [2022-12-14 09:41:27,388 INFO L78 Accepts]: Start accepts. Automaton has has 163 states, 163 states have (on average 1.9386503067484662) internal successors, (316), 163 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 107 [2022-12-14 09:41:27,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:41:27,388 INFO L225 Difference]: With dead ends: 270 [2022-12-14 09:41:27,388 INFO L226 Difference]: Without dead ends: 268 [2022-12-14 09:41:27,392 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 506 GetRequests, 209 SyntacticMatches, 0 SemanticMatches, 297 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22267 ImplicationChecksByTransitivity, 30.5s TimeCoverageRelationStatistics Valid=5609, Invalid=83493, Unknown=0, NotChecked=0, Total=89102 [2022-12-14 09:41:27,392 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 506 mSDsluCounter, 2532 mSDsCounter, 0 mSdLazyCounter, 7960 mSolverCounterSat, 292 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 506 SdHoareTripleChecker+Valid, 2560 SdHoareTripleChecker+Invalid, 8252 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 292 IncrementalHoareTripleChecker+Valid, 7960 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2022-12-14 09:41:27,393 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [506 Valid, 2560 Invalid, 8252 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [292 Valid, 7960 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2022-12-14 09:41:27,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2022-12-14 09:41:27,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 190. [2022-12-14 09:41:27,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 189 states have (on average 1.0158730158730158) internal successors, (192), 189 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:41:27,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 192 transitions. [2022-12-14 09:41:27,480 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 192 transitions. Word has length 107 [2022-12-14 09:41:27,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:41:27,480 INFO L495 AbstractCegarLoop]: Abstraction has 190 states and 192 transitions. [2022-12-14 09:41:27,480 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 163 states, 163 states have (on average 1.9386503067484662) internal successors, (316), 163 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:41:27,480 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 192 transitions. [2022-12-14 09:41:27,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2022-12-14 09:41:27,481 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:41:27,481 INFO L195 NwaCegarLoop]: trace histogram [27, 27, 26, 26, 1, 1, 1, 1, 1] [2022-12-14 09:41:27,488 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2022-12-14 09:41:27,681 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2022-12-14 09:41:27,682 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:41:27,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:41:27,683 INFO L85 PathProgramCache]: Analyzing trace with hash -808206174, now seen corresponding path program 45 times [2022-12-14 09:41:27,683 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:41:27,683 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1955455890] [2022-12-14 09:41:27,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:41:27,684 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:41:27,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:41:30,162 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 0 proven. 1405 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:41:30,162 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:41:30,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1955455890] [2022-12-14 09:41:30,162 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1955455890] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:41:30,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1160766199] [2022-12-14 09:41:30,162 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:41:30,162 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:41:30,162 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:41:30,163 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:41:30,163 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-12-14 09:41:31,123 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:41:31,123 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:41:31,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 125 conjunts are in the unsatisfiable core [2022-12-14 09:41:31,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:41:31,186 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 15 treesize of output 11 [2022-12-14 09:41:32,838 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 47 treesize of output 23 [2022-12-14 09:41:32,890 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 0 proven. 1405 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:41:32,890 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:41:33,346 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:41:33,347 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:41:33,351 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:41:33,353 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:41:33,418 INFO L134 CoverageAnalysis]: Checked inductivity of 1405 backedges. 0 proven. 1405 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:41:33,419 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1160766199] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:41:33,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1754566728] [2022-12-14 09:41:33,419 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:41:33,420 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:41:33,420 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:41:33,420 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:41:33,420 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:41:33,427 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:41:33,436 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:41:33,436 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:41:33,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:41:33,452 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:41:33,452 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:41:33,465 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:41:33,465 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:41:33,490 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:41:33,491 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:41:33,499 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:41:33,500 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:41:33,529 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:41:33,557 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:41:36,225 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31048#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:41:36,226 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:41:36,226 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:41:36,226 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 59, 59] total 88 [2022-12-14 09:41:36,226 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [445873088] [2022-12-14 09:41:36,226 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:41:36,226 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2022-12-14 09:41:36,226 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:41:36,227 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2022-12-14 09:41:36,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=8303, Unknown=0, NotChecked=0, Total=8556 [2022-12-14 09:41:36,227 INFO L87 Difference]: Start difference. First operand 190 states and 192 transitions. Second operand has 88 states, 88 states have (on average 2.215909090909091) internal successors, (195), 88 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:41:39,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:41:39,642 INFO L93 Difference]: Finished difference Result 279 states and 281 transitions. [2022-12-14 09:41:39,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2022-12-14 09:41:39,642 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 88 states have (on average 2.215909090909091) internal successors, (195), 88 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 111 [2022-12-14 09:41:39,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:41:39,644 INFO L225 Difference]: With dead ends: 279 [2022-12-14 09:41:39,644 INFO L226 Difference]: Without dead ends: 277 [2022-12-14 09:41:39,645 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 424 GetRequests, 266 SyntacticMatches, 32 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3215 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=501, Invalid=15755, Unknown=0, NotChecked=0, Total=16256 [2022-12-14 09:41:39,645 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 53 mSDsluCounter, 1984 mSDsCounter, 0 mSdLazyCounter, 5881 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 2018 SdHoareTripleChecker+Invalid, 5913 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 5881 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-12-14 09:41:39,645 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 2018 Invalid, 5913 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 5881 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-12-14 09:41:39,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2022-12-14 09:41:39,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 190. [2022-12-14 09:41:39,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 189 states have (on average 1.0158730158730158) internal successors, (192), 189 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:41:39,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 192 transitions. [2022-12-14 09:41:39,744 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 192 transitions. Word has length 111 [2022-12-14 09:41:39,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:41:39,744 INFO L495 AbstractCegarLoop]: Abstraction has 190 states and 192 transitions. [2022-12-14 09:41:39,744 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 88 states, 88 states have (on average 2.215909090909091) internal successors, (195), 88 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:41:39,745 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 192 transitions. [2022-12-14 09:41:39,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2022-12-14 09:41:39,745 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:41:39,745 INFO L195 NwaCegarLoop]: trace histogram [28, 27, 27, 27, 1, 1, 1, 1, 1] [2022-12-14 09:41:39,752 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Ended with exit code 0 [2022-12-14 09:41:39,945 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:41:39,946 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:41:39,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:41:39,947 INFO L85 PathProgramCache]: Analyzing trace with hash 321325211, now seen corresponding path program 46 times [2022-12-14 09:41:39,947 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:41:39,947 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1587638826] [2022-12-14 09:41:39,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:41:39,948 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:41:40,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:41:41,072 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 1028 proven. 457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:41:41,072 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:41:41,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1587638826] [2022-12-14 09:41:41,072 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1587638826] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:41:41,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [663260621] [2022-12-14 09:41:41,072 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:41:41,072 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:41:41,072 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:41:41,073 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:41:41,074 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-12-14 09:41:41,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:41:41,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 566 conjuncts, 58 conjunts are in the unsatisfiable core [2022-12-14 09:41:41,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:41:42,198 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 1107 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:41:42,198 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:41:43,036 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 1107 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:41:43,036 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [663260621] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:41:43,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1710916277] [2022-12-14 09:41:43,037 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:41:43,037 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:41:43,037 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:41:43,038 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:41:43,038 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:41:43,045 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:41:43,054 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:41:43,054 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:41:43,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:41:43,060 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:41:43,073 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:41:43,074 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:41:43,097 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:41:43,099 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:41:43,108 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:41:43,108 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:41:43,140 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:41:43,172 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:41:44,644 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32549#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:41:44,644 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:41:44,644 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:41:44,644 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 88 [2022-12-14 09:41:44,644 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1569873958] [2022-12-14 09:41:44,644 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:41:44,645 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2022-12-14 09:41:44,645 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:41:44,646 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2022-12-14 09:41:44,646 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1787, Invalid=6769, Unknown=0, NotChecked=0, Total=8556 [2022-12-14 09:41:44,646 INFO L87 Difference]: Start difference. First operand 190 states and 192 transitions. Second operand has 88 states, 88 states have (on average 2.3068181818181817) internal successors, (203), 88 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:41:45,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:41:45,926 INFO L93 Difference]: Finished difference Result 364 states and 367 transitions. [2022-12-14 09:41:45,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2022-12-14 09:41:45,927 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 88 states have (on average 2.3068181818181817) internal successors, (203), 88 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 114 [2022-12-14 09:41:45,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:41:45,927 INFO L225 Difference]: With dead ends: 364 [2022-12-14 09:41:45,927 INFO L226 Difference]: Without dead ends: 122 [2022-12-14 09:41:45,928 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 452 GetRequests, 224 SyntacticMatches, 83 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10232 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=4299, Invalid=17163, Unknown=0, NotChecked=0, Total=21462 [2022-12-14 09:41:45,929 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 450 mSDsluCounter, 317 mSDsCounter, 0 mSdLazyCounter, 704 mSolverCounterSat, 227 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 450 SdHoareTripleChecker+Valid, 347 SdHoareTripleChecker+Invalid, 931 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 227 IncrementalHoareTripleChecker+Valid, 704 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 09:41:45,929 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [450 Valid, 347 Invalid, 931 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [227 Valid, 704 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 09:41:45,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2022-12-14 09:41:45,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 116. [2022-12-14 09:41:45,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 115 states have (on average 1.017391304347826) internal successors, (117), 115 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:41:45,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 117 transitions. [2022-12-14 09:41:45,997 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 117 transitions. Word has length 114 [2022-12-14 09:41:45,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:41:45,997 INFO L495 AbstractCegarLoop]: Abstraction has 116 states and 117 transitions. [2022-12-14 09:41:45,997 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 88 states, 88 states have (on average 2.3068181818181817) internal successors, (203), 88 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:41:45,997 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 117 transitions. [2022-12-14 09:41:45,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2022-12-14 09:41:45,997 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:41:45,997 INFO L195 NwaCegarLoop]: trace histogram [28, 28, 27, 27, 1, 1, 1, 1, 1] [2022-12-14 09:41:46,002 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Ended with exit code 0 [2022-12-14 09:41:46,198 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2022-12-14 09:41:46,199 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:41:46,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:41:46,200 INFO L85 PathProgramCache]: Analyzing trace with hash 1553619841, now seen corresponding path program 47 times [2022-12-14 09:41:46,200 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:41:46,200 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1677067929] [2022-12-14 09:41:46,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:41:46,201 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:41:46,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:41:48,390 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 0 proven. 1513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:41:48,391 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:41:48,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1677067929] [2022-12-14 09:41:48,391 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1677067929] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:41:48,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2105735098] [2022-12-14 09:41:48,391 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:41:48,391 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:41:48,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:41:48,392 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:41:48,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2022-12-14 09:42:05,892 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2022-12-14 09:42:05,892 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:42:05,909 INFO L263 TraceCheckSpWp]: Trace formula consists of 575 conjuncts, 132 conjunts are in the unsatisfiable core [2022-12-14 09:42:05,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:42:05,953 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:42:06,008 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 33 treesize of output 32 [2022-12-14 09:42:06,098 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 09:42:06,098 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 46 [2022-12-14 09:42:09,974 INFO L321 Elim1Store]: treesize reduction 28, result has 9.7 percent of original size [2022-12-14 09:42:09,975 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 68 treesize of output 33 [2022-12-14 09:42:10,046 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 0 proven. 1513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:42:10,046 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:42:10,575 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 36 treesize of output 34 [2022-12-14 09:42:10,577 INFO L350 Elim1Store]: Elim1 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 266 treesize of output 258 [2022-12-14 09:42:10,595 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 36 treesize of output 34 [2022-12-14 09:42:10,597 INFO L350 Elim1Store]: Elim1 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 266 treesize of output 258 [2022-12-14 09:42:12,679 INFO L134 CoverageAnalysis]: Checked inductivity of 1513 backedges. 3 proven. 1510 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:42:12,679 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2105735098] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:42:12,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1806206228] [2022-12-14 09:42:12,680 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:42:12,680 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:42:12,680 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:42:12,680 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:42:12,680 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:42:12,688 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:42:12,698 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:42:12,699 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:42:12,705 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:42:12,705 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:42:12,715 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:42:12,715 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-12-14 09:42:12,751 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:42:12,751 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 09:42:12,773 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-12-14 09:42:12,773 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 202 [2022-12-14 09:42:12,805 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:42:12,841 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:42:13,449 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '34143#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:42:13,449 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:42:13,449 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:42:13,449 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 121 [2022-12-14 09:42:13,450 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1347742798] [2022-12-14 09:42:13,450 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:42:13,450 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 121 states [2022-12-14 09:42:13,450 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:42:13,450 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 121 interpolants. [2022-12-14 09:42:13,451 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=551, Invalid=15199, Unknown=0, NotChecked=0, Total=15750 [2022-12-14 09:42:13,451 INFO L87 Difference]: Start difference. First operand 116 states and 117 transitions. Second operand has 121 states, 121 states have (on average 1.9421487603305785) internal successors, (235), 121 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:42:17,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:42:17,793 INFO L93 Difference]: Finished difference Result 123 states and 124 transitions. [2022-12-14 09:42:17,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2022-12-14 09:42:17,793 INFO L78 Accepts]: Start accepts. Automaton has has 121 states, 121 states have (on average 1.9421487603305785) internal successors, (235), 121 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 115 [2022-12-14 09:42:17,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:42:17,793 INFO L225 Difference]: With dead ends: 123 [2022-12-14 09:42:17,793 INFO L226 Difference]: Without dead ends: 121 [2022-12-14 09:42:17,794 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 434 GetRequests, 277 SyntacticMatches, 2 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3695 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=920, Invalid=23572, Unknown=0, NotChecked=0, Total=24492 [2022-12-14 09:42:17,794 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 58 mSDsluCounter, 1657 mSDsCounter, 0 mSdLazyCounter, 5710 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 1685 SdHoareTripleChecker+Invalid, 5739 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 5710 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-12-14 09:42:17,795 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 1685 Invalid, 5739 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 5710 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-12-14 09:42:17,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2022-12-14 09:42:17,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 119. [2022-12-14 09:42:17,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 118 states have (on average 1.0169491525423728) internal successors, (120), 118 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:42:17,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 120 transitions. [2022-12-14 09:42:17,863 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 120 transitions. Word has length 115 [2022-12-14 09:42:17,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:42:17,863 INFO L495 AbstractCegarLoop]: Abstraction has 119 states and 120 transitions. [2022-12-14 09:42:17,863 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 121 states, 121 states have (on average 1.9421487603305785) internal successors, (235), 121 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:42:17,863 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 120 transitions. [2022-12-14 09:42:17,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2022-12-14 09:42:17,863 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:42:17,864 INFO L195 NwaCegarLoop]: trace histogram [29, 28, 28, 28, 1, 1, 1, 1, 1] [2022-12-14 09:42:17,873 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Ended with exit code 0 [2022-12-14 09:42:18,064 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2022-12-14 09:42:18,065 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:42:18,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:42:18,066 INFO L85 PathProgramCache]: Analyzing trace with hash 1325895004, now seen corresponding path program 48 times [2022-12-14 09:42:18,066 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:42:18,066 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1623772775] [2022-12-14 09:42:18,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:42:18,067 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:42:18,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:42:19,171 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 1108 proven. 488 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:42:19,172 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:42:19,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1623772775] [2022-12-14 09:42:19,172 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1623772775] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:42:19,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [820070795] [2022-12-14 09:42:19,172 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:42:19,172 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:42:19,172 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:42:19,173 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:42:19,173 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2022-12-14 09:42:20,570 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:42:20,570 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:42:20,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 585 conjuncts, 60 conjunts are in the unsatisfiable core [2022-12-14 09:42:20,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:42:21,691 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 1190 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:42:21,691 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:42:22,378 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 1190 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:42:22,378 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [820070795] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:42:22,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [801521268] [2022-12-14 09:42:22,379 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:42:22,379 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:42:22,379 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:42:22,379 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:42:22,379 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:42:22,387 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:42:22,395 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:42:22,395 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:42:22,400 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:42:22,401 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:42:22,409 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:42:22,409 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:42:22,433 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:42:22,434 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:42:22,443 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:42:22,443 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:42:22,467 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:42:22,494 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:42:23,887 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '35362#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:42:23,887 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:42:23,887 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:42:23,887 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 91 [2022-12-14 09:42:23,887 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1712684790] [2022-12-14 09:42:23,887 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:42:23,887 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 91 states [2022-12-14 09:42:23,888 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:42:23,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2022-12-14 09:42:23,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1908, Invalid=7212, Unknown=0, NotChecked=0, Total=9120 [2022-12-14 09:42:23,889 INFO L87 Difference]: Start difference. First operand 119 states and 120 transitions. Second operand has 91 states, 91 states have (on average 2.3076923076923075) internal successors, (210), 91 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:42:24,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:42:24,625 INFO L93 Difference]: Finished difference Result 216 states and 218 transitions. [2022-12-14 09:42:24,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-12-14 09:42:24,625 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 91 states have (on average 2.3076923076923075) internal successors, (210), 91 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 118 [2022-12-14 09:42:24,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:42:24,626 INFO L225 Difference]: With dead ends: 216 [2022-12-14 09:42:24,626 INFO L226 Difference]: Without dead ends: 126 [2022-12-14 09:42:24,627 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 440 GetRequests, 232 SyntacticMatches, 86 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8946 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=3238, Invalid=12014, Unknown=0, NotChecked=0, Total=15252 [2022-12-14 09:42:24,627 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 484 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 437 mSolverCounterSat, 242 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 484 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 679 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 242 IncrementalHoareTripleChecker+Valid, 437 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 09:42:24,627 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [484 Valid, 209 Invalid, 679 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [242 Valid, 437 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 09:42:24,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2022-12-14 09:42:24,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 120. [2022-12-14 09:42:24,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 119 states have (on average 1.0168067226890756) internal successors, (121), 119 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:42:24,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 121 transitions. [2022-12-14 09:42:24,697 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 121 transitions. Word has length 118 [2022-12-14 09:42:24,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:42:24,698 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 121 transitions. [2022-12-14 09:42:24,698 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 91 states, 91 states have (on average 2.3076923076923075) internal successors, (210), 91 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:42:24,698 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 121 transitions. [2022-12-14 09:42:24,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2022-12-14 09:42:24,698 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:42:24,698 INFO L195 NwaCegarLoop]: trace histogram [29, 29, 28, 28, 1, 1, 1, 1, 1] [2022-12-14 09:42:24,706 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Ended with exit code 0 [2022-12-14 09:42:24,899 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2022-12-14 09:42:24,899 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:42:24,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:42:24,900 INFO L85 PathProgramCache]: Analyzing trace with hash 925564226, now seen corresponding path program 49 times [2022-12-14 09:42:24,900 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:42:24,901 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1831115529] [2022-12-14 09:42:24,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:42:24,901 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:42:24,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:42:27,432 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 0 proven. 1625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:42:27,432 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:42:27,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1831115529] [2022-12-14 09:42:27,432 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1831115529] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:42:27,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [687342176] [2022-12-14 09:42:27,433 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:42:27,433 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:42:27,433 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:42:27,433 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:42:27,434 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2022-12-14 09:42:27,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:42:27,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 594 conjuncts, 130 conjunts are in the unsatisfiable core [2022-12-14 09:42:27,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:42:29,022 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 09:42:31,506 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 0 proven. 1625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:42:31,506 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:42:31,897 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:42:31,899 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:42:31,903 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:42:31,904 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:42:31,970 INFO L134 CoverageAnalysis]: Checked inductivity of 1625 backedges. 0 proven. 1625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:42:31,970 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [687342176] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:42:31,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [941643240] [2022-12-14 09:42:31,971 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:42:31,971 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:42:31,971 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:42:31,971 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:42:31,971 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:42:31,979 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:42:31,986 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:42:31,987 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:42:31,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:42:31,992 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:42:32,004 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:42:32,005 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:42:32,030 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:42:32,031 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:42:32,039 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:42:32,039 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:42:32,069 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:42:32,111 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:42:35,788 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36739#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:42:35,788 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:42:35,788 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:42:35,788 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 123 [2022-12-14 09:42:35,788 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [126565169] [2022-12-14 09:42:35,789 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:42:35,789 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2022-12-14 09:42:35,789 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:42:35,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2022-12-14 09:42:35,791 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=15874, Unknown=0, NotChecked=0, Total=16256 [2022-12-14 09:42:35,791 INFO L87 Difference]: Start difference. First operand 120 states and 121 transitions. Second operand has 123 states, 123 states have (on average 1.951219512195122) internal successors, (240), 123 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:42:39,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:42:39,907 INFO L93 Difference]: Finished difference Result 127 states and 128 transitions. [2022-12-14 09:42:39,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2022-12-14 09:42:39,908 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 123 states have (on average 1.951219512195122) internal successors, (240), 123 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 119 [2022-12-14 09:42:39,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:42:39,909 INFO L225 Difference]: With dead ends: 127 [2022-12-14 09:42:39,909 INFO L226 Difference]: Without dead ends: 125 [2022-12-14 09:42:39,909 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 449 GetRequests, 259 SyntacticMatches, 32 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6532 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=638, Invalid=24802, Unknown=0, NotChecked=0, Total=25440 [2022-12-14 09:42:39,910 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 53 mSDsluCounter, 2691 mSDsCounter, 0 mSdLazyCounter, 8419 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 2722 SdHoareTripleChecker+Invalid, 8450 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 8419 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2022-12-14 09:42:39,910 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 2722 Invalid, 8450 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 8419 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2022-12-14 09:42:39,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2022-12-14 09:42:39,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 123. [2022-12-14 09:42:39,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 122 states have (on average 1.0163934426229508) internal successors, (124), 122 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:42:39,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 124 transitions. [2022-12-14 09:42:39,981 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 124 transitions. Word has length 119 [2022-12-14 09:42:39,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:42:39,981 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 124 transitions. [2022-12-14 09:42:39,981 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 123 states, 123 states have (on average 1.951219512195122) internal successors, (240), 123 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:42:39,981 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 124 transitions. [2022-12-14 09:42:39,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2022-12-14 09:42:39,982 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:42:39,982 INFO L195 NwaCegarLoop]: trace histogram [30, 29, 29, 29, 1, 1, 1, 1, 1] [2022-12-14 09:42:39,986 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2022-12-14 09:42:40,182 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:42:40,183 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:42:40,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:42:40,184 INFO L85 PathProgramCache]: Analyzing trace with hash -201390085, now seen corresponding path program 50 times [2022-12-14 09:42:40,184 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:42:40,184 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [688548516] [2022-12-14 09:42:40,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:42:40,185 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:42:40,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:42:41,418 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 1191 proven. 520 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:42:41,419 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:42:41,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [688548516] [2022-12-14 09:42:41,419 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [688548516] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:42:41,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1927152488] [2022-12-14 09:42:41,419 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:42:41,419 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:42:41,419 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:42:41,420 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:42:41,420 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2022-12-14 09:42:52,876 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2022-12-14 09:42:52,876 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:42:52,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 604 conjuncts, 62 conjunts are in the unsatisfiable core [2022-12-14 09:42:52,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:42:53,949 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 1276 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:42:53,949 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:42:54,687 INFO L134 CoverageAnalysis]: Checked inductivity of 1711 backedges. 1276 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:42:54,688 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1927152488] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:42:54,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [274181756] [2022-12-14 09:42:54,688 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:42:54,688 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:42:54,688 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:42:54,689 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:42:54,689 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:42:54,697 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:42:54,705 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:42:54,705 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:42:54,710 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:42:54,710 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:42:54,721 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:42:54,721 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:42:54,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:42:54,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:42:54,757 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:42:54,758 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:42:54,781 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:42:54,818 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:42:56,524 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '37999#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:42:56,524 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:42:56,524 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:42:56,524 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 94 [2022-12-14 09:42:56,524 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514175172] [2022-12-14 09:42:56,525 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:42:56,525 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2022-12-14 09:42:56,525 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:42:56,525 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2022-12-14 09:42:56,526 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2033, Invalid=7669, Unknown=0, NotChecked=0, Total=9702 [2022-12-14 09:42:56,526 INFO L87 Difference]: Start difference. First operand 123 states and 124 transitions. Second operand has 94 states, 94 states have (on average 2.3085106382978724) internal successors, (217), 94 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:42:57,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:42:57,261 INFO L93 Difference]: Finished difference Result 223 states and 225 transitions. [2022-12-14 09:42:57,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2022-12-14 09:42:57,261 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 2.3085106382978724) internal successors, (217), 94 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 122 [2022-12-14 09:42:57,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:42:57,261 INFO L225 Difference]: With dead ends: 223 [2022-12-14 09:42:57,261 INFO L226 Difference]: Without dead ends: 130 [2022-12-14 09:42:57,262 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 455 GetRequests, 240 SyntacticMatches, 89 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9540 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=3454, Invalid=12802, Unknown=0, NotChecked=0, Total=16256 [2022-12-14 09:42:57,262 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 336 mSDsluCounter, 269 mSDsCounter, 0 mSdLazyCounter, 611 mSolverCounterSat, 168 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 336 SdHoareTripleChecker+Valid, 301 SdHoareTripleChecker+Invalid, 779 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 168 IncrementalHoareTripleChecker+Valid, 611 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 09:42:57,263 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [336 Valid, 301 Invalid, 779 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [168 Valid, 611 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 09:42:57,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2022-12-14 09:42:57,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 124. [2022-12-14 09:42:57,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 123 states have (on average 1.016260162601626) internal successors, (125), 123 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:42:57,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 125 transitions. [2022-12-14 09:42:57,334 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 125 transitions. Word has length 122 [2022-12-14 09:42:57,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:42:57,335 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 125 transitions. [2022-12-14 09:42:57,335 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 94 states have (on average 2.3085106382978724) internal successors, (217), 94 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:42:57,335 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 125 transitions. [2022-12-14 09:42:57,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-12-14 09:42:57,335 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:42:57,335 INFO L195 NwaCegarLoop]: trace histogram [30, 30, 29, 29, 1, 1, 1, 1, 1] [2022-12-14 09:42:57,343 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2022-12-14 09:42:57,536 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:42:57,536 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:42:57,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:42:57,537 INFO L85 PathProgramCache]: Analyzing trace with hash 997987553, now seen corresponding path program 51 times [2022-12-14 09:42:57,538 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:42:57,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1886071140] [2022-12-14 09:42:57,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:42:57,539 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:42:57,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:43:00,285 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 0 proven. 1741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:43:00,285 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:43:00,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1886071140] [2022-12-14 09:43:00,285 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1886071140] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:43:00,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [651506773] [2022-12-14 09:43:00,285 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:43:00,285 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:43:00,285 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:43:00,286 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:43:00,287 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2022-12-14 09:43:04,702 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:43:04,703 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:43:04,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 613 conjuncts, 137 conjunts are in the unsatisfiable core [2022-12-14 09:43:04,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:43:04,780 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 15 treesize of output 11 [2022-12-14 09:43:07,054 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 47 treesize of output 23 [2022-12-14 09:43:07,107 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 0 proven. 1741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:43:07,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:43:07,564 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:43:07,565 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:43:07,568 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:43:07,569 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:43:07,642 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 0 proven. 1741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:43:07,642 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [651506773] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:43:07,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1936721999] [2022-12-14 09:43:07,643 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:43:07,643 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:43:07,643 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:43:07,644 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:43:07,644 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:43:07,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:43:07,659 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:43:07,660 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:43:07,665 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:43:07,677 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:43:07,677 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:43:07,689 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:43:07,690 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:43:07,714 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:43:07,716 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:43:07,726 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:43:07,727 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:43:07,756 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:43:07,807 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:43:10,789 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '39392#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:43:10,789 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:43:10,789 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:43:10,789 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 65, 65] total 97 [2022-12-14 09:43:10,789 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [62109239] [2022-12-14 09:43:10,789 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:43:10,789 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2022-12-14 09:43:10,789 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:43:10,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2022-12-14 09:43:10,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=277, Invalid=10025, Unknown=0, NotChecked=0, Total=10302 [2022-12-14 09:43:10,790 INFO L87 Difference]: Start difference. First operand 124 states and 125 transitions. Second operand has 97 states, 97 states have (on average 2.2268041237113403) internal successors, (216), 97 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:43:14,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:43:14,603 INFO L93 Difference]: Finished difference Result 131 states and 132 transitions. [2022-12-14 09:43:14,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2022-12-14 09:43:14,603 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 2.2268041237113403) internal successors, (216), 97 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 123 [2022-12-14 09:43:14,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:43:14,604 INFO L225 Difference]: With dead ends: 131 [2022-12-14 09:43:14,604 INFO L226 Difference]: Without dead ends: 129 [2022-12-14 09:43:14,605 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 296 SyntacticMatches, 35 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3692 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=538, Invalid=18368, Unknown=0, NotChecked=0, Total=18906 [2022-12-14 09:43:14,605 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 45 mSDsluCounter, 2184 mSDsCounter, 0 mSdLazyCounter, 7539 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 2215 SdHoareTripleChecker+Invalid, 7571 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 7539 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-12-14 09:43:14,605 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 2215 Invalid, 7571 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 7539 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2022-12-14 09:43:14,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2022-12-14 09:43:14,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 127. [2022-12-14 09:43:14,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 126 states have (on average 1.0158730158730158) internal successors, (128), 126 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:43:14,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 128 transitions. [2022-12-14 09:43:14,693 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 128 transitions. Word has length 123 [2022-12-14 09:43:14,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:43:14,694 INFO L495 AbstractCegarLoop]: Abstraction has 127 states and 128 transitions. [2022-12-14 09:43:14,694 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 2.2268041237113403) internal successors, (216), 97 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:43:14,694 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 128 transitions. [2022-12-14 09:43:14,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2022-12-14 09:43:14,694 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:43:14,694 INFO L195 NwaCegarLoop]: trace histogram [31, 30, 30, 30, 1, 1, 1, 1, 1] [2022-12-14 09:43:14,704 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2022-12-14 09:43:14,894 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2022-12-14 09:43:14,895 INFO L420 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:43:14,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:43:14,895 INFO L85 PathProgramCache]: Analyzing trace with hash 1288361980, now seen corresponding path program 52 times [2022-12-14 09:43:14,895 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:43:14,895 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1215728357] [2022-12-14 09:43:14,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:43:14,895 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:43:14,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:43:16,123 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 1277 proven. 553 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:43:16,123 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:43:16,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1215728357] [2022-12-14 09:43:16,123 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1215728357] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:43:16,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [610113581] [2022-12-14 09:43:16,124 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:43:16,124 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:43:16,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:43:16,124 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:43:16,125 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2022-12-14 09:43:16,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:43:16,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 623 conjuncts, 64 conjunts are in the unsatisfiable core [2022-12-14 09:43:16,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:43:17,363 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 1365 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:43:17,363 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:43:18,331 INFO L134 CoverageAnalysis]: Checked inductivity of 1830 backedges. 1365 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:43:18,331 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [610113581] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:43:18,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1772553042] [2022-12-14 09:43:18,332 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:43:18,332 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:43:18,332 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:43:18,332 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:43:18,333 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:43:18,340 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:43:18,349 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:43:18,349 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:43:18,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:43:18,355 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:43:18,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:43:18,366 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-12-14 09:43:18,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:43:18,390 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 09:43:18,404 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-12-14 09:43:18,405 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 202 [2022-12-14 09:43:18,443 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:43:18,474 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:43:18,854 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '40699#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:43:18,855 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:43:18,855 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:43:18,855 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 97 [2022-12-14 09:43:18,855 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493295168] [2022-12-14 09:43:18,855 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:43:18,855 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2022-12-14 09:43:18,855 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:43:18,856 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2022-12-14 09:43:18,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2162, Invalid=8140, Unknown=0, NotChecked=0, Total=10302 [2022-12-14 09:43:18,857 INFO L87 Difference]: Start difference. First operand 127 states and 128 transitions. Second operand has 97 states, 97 states have (on average 2.3092783505154637) internal successors, (224), 97 states have internal predecessors, (224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:43:19,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:43:19,637 INFO L93 Difference]: Finished difference Result 230 states and 232 transitions. [2022-12-14 09:43:19,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-12-14 09:43:19,637 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 2.3092783505154637) internal successors, (224), 97 states have internal predecessors, (224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 126 [2022-12-14 09:43:19,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:43:19,638 INFO L225 Difference]: With dead ends: 230 [2022-12-14 09:43:19,638 INFO L226 Difference]: Without dead ends: 134 [2022-12-14 09:43:19,639 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 470 GetRequests, 279 SyntacticMatches, 61 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7179 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=3677, Invalid=13615, Unknown=0, NotChecked=0, Total=17292 [2022-12-14 09:43:19,639 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 352 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 474 mSolverCounterSat, 176 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 352 SdHoareTripleChecker+Valid, 228 SdHoareTripleChecker+Invalid, 650 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 176 IncrementalHoareTripleChecker+Valid, 474 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 09:43:19,639 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [352 Valid, 228 Invalid, 650 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [176 Valid, 474 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 09:43:19,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2022-12-14 09:43:19,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 128. [2022-12-14 09:43:19,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 127 states have (on average 1.015748031496063) internal successors, (129), 127 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:43:19,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 129 transitions. [2022-12-14 09:43:19,715 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 129 transitions. Word has length 126 [2022-12-14 09:43:19,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:43:19,715 INFO L495 AbstractCegarLoop]: Abstraction has 128 states and 129 transitions. [2022-12-14 09:43:19,716 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 2.3092783505154637) internal successors, (224), 97 states have internal predecessors, (224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:43:19,716 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 129 transitions. [2022-12-14 09:43:19,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2022-12-14 09:43:19,716 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:43:19,716 INFO L195 NwaCegarLoop]: trace histogram [31, 31, 30, 30, 1, 1, 1, 1, 1] [2022-12-14 09:43:19,721 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Ended with exit code 0 [2022-12-14 09:43:19,916 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2022-12-14 09:43:19,917 INFO L420 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:43:19,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:43:19,918 INFO L85 PathProgramCache]: Analyzing trace with hash 1133183458, now seen corresponding path program 53 times [2022-12-14 09:43:19,918 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:43:19,918 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1676865315] [2022-12-14 09:43:19,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:43:19,919 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:43:20,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:43:22,893 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 0 proven. 1861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:43:22,893 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:43:22,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1676865315] [2022-12-14 09:43:22,893 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1676865315] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:43:22,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [963633395] [2022-12-14 09:43:22,893 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:43:22,893 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:43:22,893 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:43:22,894 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:43:22,895 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2022-12-14 09:43:54,735 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 31 check-sat command(s) [2022-12-14 09:43:54,735 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:43:54,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 632 conjuncts, 159 conjunts are in the unsatisfiable core [2022-12-14 09:43:54,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:43:56,516 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 09:44:00,295 INFO L321 Elim1Store]: treesize reduction 28, result has 9.7 percent of original size [2022-12-14 09:44:00,295 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 60 treesize of output 29 [2022-12-14 09:44:00,361 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 1001 proven. 860 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:44:00,362 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:44:06,670 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 53 treesize of output 47 [2022-12-14 09:44:06,675 INFO L321 Elim1Store]: treesize reduction 20, result has 4.8 percent of original size [2022-12-14 09:44:06,675 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 82 treesize of output 68 [2022-12-14 09:44:10,834 INFO L134 CoverageAnalysis]: Checked inductivity of 1861 backedges. 1293 proven. 568 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:44:10,834 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [963633395] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:44:10,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [527199910] [2022-12-14 09:44:10,835 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:44:10,835 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:44:10,835 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:44:10,835 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:44:10,835 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:44:10,844 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:44:10,852 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:44:10,852 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:44:10,858 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:44:10,858 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:44:10,869 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:44:10,870 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-12-14 09:44:10,899 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:44:10,900 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 09:44:10,914 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-12-14 09:44:10,914 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 202 [2022-12-14 09:44:10,960 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:44:10,991 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:44:11,940 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '42238#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:44:11,940 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:44:11,940 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:44:11,940 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 70, 70] total 201 [2022-12-14 09:44:11,941 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879492421] [2022-12-14 09:44:11,941 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:44:11,941 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 201 states [2022-12-14 09:44:11,941 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:44:11,942 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 201 interpolants. [2022-12-14 09:44:11,944 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3336, Invalid=38893, Unknown=1, NotChecked=0, Total=42230 [2022-12-14 09:44:11,944 INFO L87 Difference]: Start difference. First operand 128 states and 129 transitions. Second operand has 201 states, 201 states have (on average 1.8706467661691542) internal successors, (376), 201 states have internal predecessors, (376), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:44:28,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:44:28,289 INFO L93 Difference]: Finished difference Result 230 states and 233 transitions. [2022-12-14 09:44:28,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 178 states. [2022-12-14 09:44:28,289 INFO L78 Accepts]: Start accepts. Automaton has has 201 states, 201 states have (on average 1.8706467661691542) internal successors, (376), 201 states have internal predecessors, (376), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 127 [2022-12-14 09:44:28,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:44:28,290 INFO L225 Difference]: With dead ends: 230 [2022-12-14 09:44:28,290 INFO L226 Difference]: Without dead ends: 134 [2022-12-14 09:44:28,294 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 583 GetRequests, 241 SyntacticMatches, 0 SemanticMatches, 342 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30915 ImplicationChecksByTransitivity, 29.7s TimeCoverageRelationStatistics Valid=8242, Invalid=109749, Unknown=1, NotChecked=0, Total=117992 [2022-12-14 09:44:28,294 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 386 mSDsluCounter, 2395 mSDsCounter, 0 mSdLazyCounter, 8539 mSolverCounterSat, 208 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 386 SdHoareTripleChecker+Valid, 2426 SdHoareTripleChecker+Invalid, 8747 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 208 IncrementalHoareTripleChecker+Valid, 8539 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2022-12-14 09:44:28,295 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [386 Valid, 2426 Invalid, 8747 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [208 Valid, 8539 Invalid, 0 Unknown, 0 Unchecked, 3.8s Time] [2022-12-14 09:44:28,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2022-12-14 09:44:28,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 132. [2022-12-14 09:44:28,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 131 states have (on average 1.015267175572519) internal successors, (133), 131 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:44:28,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 133 transitions. [2022-12-14 09:44:28,371 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 133 transitions. Word has length 127 [2022-12-14 09:44:28,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:44:28,371 INFO L495 AbstractCegarLoop]: Abstraction has 132 states and 133 transitions. [2022-12-14 09:44:28,371 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 201 states, 201 states have (on average 1.8706467661691542) internal successors, (376), 201 states have internal predecessors, (376), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:44:28,371 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 133 transitions. [2022-12-14 09:44:28,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2022-12-14 09:44:28,372 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:44:28,372 INFO L195 NwaCegarLoop]: trace histogram [32, 32, 31, 31, 1, 1, 1, 1, 1] [2022-12-14 09:44:28,383 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2022-12-14 09:44:28,572 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2022-12-14 09:44:28,573 INFO L420 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:44:28,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:44:28,573 INFO L85 PathProgramCache]: Analyzing trace with hash -219806143, now seen corresponding path program 54 times [2022-12-14 09:44:28,574 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:44:28,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [648265120] [2022-12-14 09:44:28,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:44:28,574 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:44:28,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:44:31,890 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 0 proven. 1985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:44:31,890 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:44:31,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [648265120] [2022-12-14 09:44:31,890 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [648265120] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:44:31,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2033390684] [2022-12-14 09:44:31,890 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:44:31,890 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:44:31,890 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:44:31,891 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:44:31,892 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2022-12-14 09:44:35,033 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:44:35,033 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:44:35,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 651 conjuncts, 145 conjunts are in the unsatisfiable core [2022-12-14 09:44:35,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:44:35,093 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 15 treesize of output 11 [2022-12-14 09:44:37,327 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 47 treesize of output 23 [2022-12-14 09:44:37,380 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 0 proven. 1985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:44:37,380 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:44:37,786 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:44:37,787 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:44:37,791 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:44:37,792 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:44:37,856 INFO L134 CoverageAnalysis]: Checked inductivity of 1985 backedges. 0 proven. 1985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:44:37,856 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2033390684] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:44:37,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [481553933] [2022-12-14 09:44:37,857 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:44:37,857 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:44:37,857 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:44:37,857 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:44:37,857 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:44:37,863 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:44:37,871 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:44:37,871 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:44:37,877 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:44:37,886 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:44:37,886 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:44:37,896 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:44:37,896 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:44:37,934 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:44:37,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:44:37,944 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:44:37,945 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:44:37,983 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:44:38,036 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:44:41,218 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '43927#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:44:41,218 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:44:41,218 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:44:41,218 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 69, 69] total 103 [2022-12-14 09:44:41,218 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1925204523] [2022-12-14 09:44:41,218 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:44:41,218 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2022-12-14 09:44:41,218 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:44:41,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2022-12-14 09:44:41,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=11263, Unknown=0, NotChecked=0, Total=11556 [2022-12-14 09:44:41,219 INFO L87 Difference]: Start difference. First operand 132 states and 133 transitions. Second operand has 103 states, 103 states have (on average 2.233009708737864) internal successors, (230), 103 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:44:45,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:44:45,982 INFO L93 Difference]: Finished difference Result 139 states and 140 transitions. [2022-12-14 09:44:45,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2022-12-14 09:44:45,982 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 2.233009708737864) internal successors, (230), 103 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 131 [2022-12-14 09:44:45,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:44:45,983 INFO L225 Difference]: With dead ends: 139 [2022-12-14 09:44:45,983 INFO L226 Difference]: Without dead ends: 137 [2022-12-14 09:44:45,984 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 497 GetRequests, 316 SyntacticMatches, 37 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4126 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=568, Invalid=20602, Unknown=0, NotChecked=0, Total=21170 [2022-12-14 09:44:45,984 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 50 mSDsluCounter, 2610 mSDsCounter, 0 mSdLazyCounter, 8227 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 2643 SdHoareTripleChecker+Invalid, 8262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 8227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2022-12-14 09:44:45,984 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 2643 Invalid, 8262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 8227 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2022-12-14 09:44:45,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2022-12-14 09:44:46,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 135. [2022-12-14 09:44:46,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 134 states have (on average 1.0149253731343284) internal successors, (136), 134 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:44:46,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 136 transitions. [2022-12-14 09:44:46,072 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 136 transitions. Word has length 131 [2022-12-14 09:44:46,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:44:46,072 INFO L495 AbstractCegarLoop]: Abstraction has 135 states and 136 transitions. [2022-12-14 09:44:46,072 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 2.233009708737864) internal successors, (230), 103 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:44:46,072 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 136 transitions. [2022-12-14 09:44:46,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2022-12-14 09:44:46,073 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:44:46,073 INFO L195 NwaCegarLoop]: trace histogram [33, 32, 32, 32, 1, 1, 1, 1, 1] [2022-12-14 09:44:46,081 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Ended with exit code 0 [2022-12-14 09:44:46,273 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2022-12-14 09:44:46,274 INFO L420 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:44:46,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:44:46,274 INFO L85 PathProgramCache]: Analyzing trace with hash 1585113756, now seen corresponding path program 55 times [2022-12-14 09:44:46,275 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:44:46,275 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1128344576] [2022-12-14 09:44:46,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:44:46,275 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:44:46,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:44:47,817 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 1458 proven. 622 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:44:47,817 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:44:47,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1128344576] [2022-12-14 09:44:47,818 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1128344576] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:44:47,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1110910756] [2022-12-14 09:44:47,818 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:44:47,818 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:44:47,818 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:44:47,819 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:44:47,819 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2022-12-14 09:44:48,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:44:48,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 661 conjuncts, 68 conjunts are in the unsatisfiable core [2022-12-14 09:44:48,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:44:49,480 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 1552 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:44:49,480 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:44:50,477 INFO L134 CoverageAnalysis]: Checked inductivity of 2080 backedges. 1552 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:44:50,477 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1110910756] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:44:50,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1457858291] [2022-12-14 09:44:50,478 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:44:50,478 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:44:50,478 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:44:50,478 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:44:50,478 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:44:50,485 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:44:50,493 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:44:50,494 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:44:50,501 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:44:50,510 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:44:50,510 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:44:50,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:44:50,523 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-12-14 09:44:50,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:44:50,549 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 09:44:50,564 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-12-14 09:44:50,564 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 202 [2022-12-14 09:44:50,613 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:44:50,645 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:44:51,029 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '45316#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:44:51,030 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:44:51,030 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:44:51,030 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 103 [2022-12-14 09:44:51,030 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677794394] [2022-12-14 09:44:51,030 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:44:51,030 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2022-12-14 09:44:51,030 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:44:51,031 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2022-12-14 09:44:51,031 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2432, Invalid=9124, Unknown=0, NotChecked=0, Total=11556 [2022-12-14 09:44:51,032 INFO L87 Difference]: Start difference. First operand 135 states and 136 transitions. Second operand has 103 states, 103 states have (on average 2.3106796116504853) internal successors, (238), 103 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:44:51,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:44:51,912 INFO L93 Difference]: Finished difference Result 244 states and 246 transitions. [2022-12-14 09:44:51,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-12-14 09:44:51,913 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 2.3106796116504853) internal successors, (238), 103 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 134 [2022-12-14 09:44:51,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:44:51,913 INFO L225 Difference]: With dead ends: 244 [2022-12-14 09:44:51,913 INFO L226 Difference]: Without dead ends: 142 [2022-12-14 09:44:51,914 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 297 SyntacticMatches, 65 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8072 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=4144, Invalid=15316, Unknown=0, NotChecked=0, Total=19460 [2022-12-14 09:44:51,915 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 404 mSDsluCounter, 219 mSDsCounter, 0 mSdLazyCounter, 527 mSolverCounterSat, 202 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 404 SdHoareTripleChecker+Valid, 254 SdHoareTripleChecker+Invalid, 729 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 202 IncrementalHoareTripleChecker+Valid, 527 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 09:44:51,915 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [404 Valid, 254 Invalid, 729 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [202 Valid, 527 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 09:44:51,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2022-12-14 09:44:51,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 136. [2022-12-14 09:44:51,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 135 states have (on average 1.0148148148148148) internal successors, (137), 135 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:44:51,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 137 transitions. [2022-12-14 09:44:51,998 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 137 transitions. Word has length 134 [2022-12-14 09:44:51,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:44:51,998 INFO L495 AbstractCegarLoop]: Abstraction has 136 states and 137 transitions. [2022-12-14 09:44:51,998 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 2.3106796116504853) internal successors, (238), 103 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:44:51,998 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 137 transitions. [2022-12-14 09:44:51,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2022-12-14 09:44:51,998 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:44:51,998 INFO L195 NwaCegarLoop]: trace histogram [33, 33, 32, 32, 1, 1, 1, 1, 1] [2022-12-14 09:44:52,004 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Ended with exit code 0 [2022-12-14 09:44:52,199 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2022-12-14 09:44:52,199 INFO L420 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:44:52,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:44:52,200 INFO L85 PathProgramCache]: Analyzing trace with hash -1065496958, now seen corresponding path program 56 times [2022-12-14 09:44:52,200 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:44:52,200 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [518906849] [2022-12-14 09:44:52,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:44:52,201 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:44:52,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:44:55,450 INFO L134 CoverageAnalysis]: Checked inductivity of 2113 backedges. 0 proven. 2113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:44:55,450 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:44:55,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [518906849] [2022-12-14 09:44:55,451 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [518906849] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:44:55,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1505201666] [2022-12-14 09:44:55,451 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:44:55,451 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:44:55,451 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:44:55,452 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:44:55,452 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2022-12-14 09:45:11,886 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2022-12-14 09:45:11,886 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:45:11,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 670 conjuncts, 144 conjunts are in the unsatisfiable core [2022-12-14 09:45:11,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:45:11,971 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 15 treesize of output 11 [2022-12-14 09:45:14,504 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 47 treesize of output 23 [2022-12-14 09:45:14,555 INFO L134 CoverageAnalysis]: Checked inductivity of 2113 backedges. 0 proven. 2113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:45:14,555 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:45:14,953 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:45:14,954 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:45:14,958 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:45:14,959 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:45:15,036 INFO L134 CoverageAnalysis]: Checked inductivity of 2113 backedges. 0 proven. 2113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:45:15,036 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1505201666] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:45:15,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2024387818] [2022-12-14 09:45:15,037 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:45:15,037 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:45:15,037 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:45:15,037 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:45:15,037 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:45:15,044 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:45:15,055 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:45:15,055 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:45:15,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:45:15,061 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:45:15,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:45:15,075 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-12-14 09:45:15,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:45:15,111 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 09:45:15,126 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-12-14 09:45:15,126 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 202 [2022-12-14 09:45:15,167 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:45:15,194 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:45:15,859 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '46842#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:45:15,859 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:45:15,859 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:45:15,860 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 104 [2022-12-14 09:45:15,860 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1466638991] [2022-12-14 09:45:15,860 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:45:15,860 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 104 states [2022-12-14 09:45:15,860 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:45:15,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2022-12-14 09:45:15,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=290, Invalid=11482, Unknown=0, NotChecked=0, Total=11772 [2022-12-14 09:45:15,862 INFO L87 Difference]: Start difference. First operand 136 states and 137 transitions. Second operand has 104 states, 104 states have (on average 2.2596153846153846) internal successors, (235), 104 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:45:20,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:45:20,313 INFO L93 Difference]: Finished difference Result 143 states and 144 transitions. [2022-12-14 09:45:20,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2022-12-14 09:45:20,313 INFO L78 Accepts]: Start accepts. Automaton has has 104 states, 104 states have (on average 2.2596153846153846) internal successors, (235), 104 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 135 [2022-12-14 09:45:20,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:45:20,313 INFO L225 Difference]: With dead ends: 143 [2022-12-14 09:45:20,313 INFO L226 Difference]: Without dead ends: 141 [2022-12-14 09:45:20,314 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 361 SyntacticMatches, 5 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2628 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=541, Invalid=20339, Unknown=0, NotChecked=0, Total=20880 [2022-12-14 09:45:20,314 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 46 mSDsluCounter, 2778 mSDsCounter, 0 mSdLazyCounter, 8820 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 2813 SdHoareTripleChecker+Invalid, 8854 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 8820 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2022-12-14 09:45:20,314 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 2813 Invalid, 8854 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 8820 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2022-12-14 09:45:20,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2022-12-14 09:45:20,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 139. [2022-12-14 09:45:20,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 138 states have (on average 1.0144927536231885) internal successors, (140), 138 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:45:20,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 140 transitions. [2022-12-14 09:45:20,397 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 140 transitions. Word has length 135 [2022-12-14 09:45:20,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:45:20,397 INFO L495 AbstractCegarLoop]: Abstraction has 139 states and 140 transitions. [2022-12-14 09:45:20,397 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 104 states, 104 states have (on average 2.2596153846153846) internal successors, (235), 104 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:45:20,397 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 140 transitions. [2022-12-14 09:45:20,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2022-12-14 09:45:20,398 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:45:20,398 INFO L195 NwaCegarLoop]: trace histogram [34, 33, 33, 33, 1, 1, 1, 1, 1] [2022-12-14 09:45:20,407 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Ended with exit code 0 [2022-12-14 09:45:20,598 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:45:20,599 INFO L420 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:45:20,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:45:20,599 INFO L85 PathProgramCache]: Analyzing trace with hash 1888202427, now seen corresponding path program 57 times [2022-12-14 09:45:20,599 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:45:20,599 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1564113857] [2022-12-14 09:45:20,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:45:20,600 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:45:20,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:45:22,478 INFO L134 CoverageAnalysis]: Checked inductivity of 2211 backedges. 1553 proven. 658 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:45:22,479 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:45:22,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1564113857] [2022-12-14 09:45:22,479 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1564113857] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:45:22,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [362216110] [2022-12-14 09:45:22,479 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:45:22,479 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:45:22,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:45:22,480 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:45:22,480 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2022-12-14 09:45:32,697 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:45:32,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:45:32,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 680 conjuncts, 70 conjunts are in the unsatisfiable core [2022-12-14 09:45:32,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:45:34,212 INFO L134 CoverageAnalysis]: Checked inductivity of 2211 backedges. 1650 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:45:34,213 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:45:35,409 INFO L134 CoverageAnalysis]: Checked inductivity of 2211 backedges. 1650 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:45:35,409 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [362216110] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:45:35,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1041432409] [2022-12-14 09:45:35,410 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:45:35,410 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:45:35,410 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:45:35,411 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:45:35,411 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:45:35,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:45:35,433 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:45:35,434 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:45:35,439 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:45:35,439 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:45:35,448 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:45:35,449 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-12-14 09:45:35,475 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:45:35,475 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 09:45:35,494 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-12-14 09:45:35,494 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 202 [2022-12-14 09:45:35,550 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:45:35,587 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:45:35,980 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '48266#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:45:35,980 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:45:35,980 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:45:35,980 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 106 [2022-12-14 09:45:35,980 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077387882] [2022-12-14 09:45:35,980 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:45:35,980 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2022-12-14 09:45:35,980 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:45:35,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2022-12-14 09:45:35,982 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2573, Invalid=9637, Unknown=0, NotChecked=0, Total=12210 [2022-12-14 09:45:35,982 INFO L87 Difference]: Start difference. First operand 139 states and 140 transitions. Second operand has 106 states, 106 states have (on average 2.311320754716981) internal successors, (245), 106 states have internal predecessors, (245), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:45:36,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:45:36,914 INFO L93 Difference]: Finished difference Result 251 states and 253 transitions. [2022-12-14 09:45:36,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2022-12-14 09:45:36,915 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 106 states have (on average 2.311320754716981) internal successors, (245), 106 states have internal predecessors, (245), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 138 [2022-12-14 09:45:36,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:45:36,915 INFO L225 Difference]: With dead ends: 251 [2022-12-14 09:45:36,915 INFO L226 Difference]: Without dead ends: 146 [2022-12-14 09:45:36,916 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 515 GetRequests, 306 SyntacticMatches, 67 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8538 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=4388, Invalid=16204, Unknown=0, NotChecked=0, Total=20592 [2022-12-14 09:45:36,916 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 456 mSDsluCounter, 316 mSDsCounter, 0 mSdLazyCounter, 722 mSolverCounterSat, 228 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 456 SdHoareTripleChecker+Valid, 352 SdHoareTripleChecker+Invalid, 950 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 228 IncrementalHoareTripleChecker+Valid, 722 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 09:45:36,916 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [456 Valid, 352 Invalid, 950 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [228 Valid, 722 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 09:45:36,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2022-12-14 09:45:36,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 140. [2022-12-14 09:45:36,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 139 states have (on average 1.014388489208633) internal successors, (141), 139 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:45:36,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 141 transitions. [2022-12-14 09:45:36,998 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 141 transitions. Word has length 138 [2022-12-14 09:45:36,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:45:36,998 INFO L495 AbstractCegarLoop]: Abstraction has 140 states and 141 transitions. [2022-12-14 09:45:36,998 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 106 states, 106 states have (on average 2.311320754716981) internal successors, (245), 106 states have internal predecessors, (245), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:45:36,998 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 141 transitions. [2022-12-14 09:45:36,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2022-12-14 09:45:36,999 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:45:36,999 INFO L195 NwaCegarLoop]: trace histogram [34, 34, 33, 33, 1, 1, 1, 1, 1] [2022-12-14 09:45:37,008 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Ended with exit code 0 [2022-12-14 09:45:37,199 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2022-12-14 09:45:37,200 INFO L420 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:45:37,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:45:37,201 INFO L85 PathProgramCache]: Analyzing trace with hash -1928450143, now seen corresponding path program 58 times [2022-12-14 09:45:37,201 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:45:37,201 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1572296622] [2022-12-14 09:45:37,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:45:37,202 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:45:37,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:45:40,662 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 0 proven. 2245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:45:40,663 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:45:40,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1572296622] [2022-12-14 09:45:40,663 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1572296622] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:45:40,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [518993413] [2022-12-14 09:45:40,663 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:45:40,663 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:45:40,663 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:45:40,664 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:45:40,664 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2022-12-14 09:45:40,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:45:40,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 689 conjuncts, 218 conjunts are in the unsatisfiable core [2022-12-14 09:45:40,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:45:42,980 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 09:45:45,729 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 0 proven. 2245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:45:45,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:45:46,135 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:45:46,136 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:45:46,139 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:45:46,141 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:45:46,237 INFO L134 CoverageAnalysis]: Checked inductivity of 2245 backedges. 0 proven. 2245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:45:46,237 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [518993413] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:45:46,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2078079923] [2022-12-14 09:45:46,238 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:45:46,238 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:45:46,238 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:45:46,238 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:45:46,238 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:45:46,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:45:46,257 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:45:46,257 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:45:46,263 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:45:46,274 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:45:46,274 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:45:46,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:45:46,287 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:45:46,311 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:45:46,313 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:45:46,324 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:45:46,324 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:45:46,347 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:45:46,379 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:45:47,251 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '49873#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:45:47,251 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:45:47,251 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:45:47,251 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 143 [2022-12-14 09:45:47,251 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637111553] [2022-12-14 09:45:47,251 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:45:47,252 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 143 states [2022-12-14 09:45:47,252 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:45:47,253 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2022-12-14 09:45:47,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=442, Invalid=21314, Unknown=0, NotChecked=0, Total=21756 [2022-12-14 09:45:47,254 INFO L87 Difference]: Start difference. First operand 140 states and 141 transitions. Second operand has 143 states, 143 states have (on average 1.9580419580419581) internal successors, (280), 143 states have internal predecessors, (280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:45:51,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:45:51,984 INFO L93 Difference]: Finished difference Result 147 states and 148 transitions. [2022-12-14 09:45:51,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2022-12-14 09:45:51,985 INFO L78 Accepts]: Start accepts. Automaton has has 143 states, 143 states have (on average 1.9580419580419581) internal successors, (280), 143 states have internal predecessors, (280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 139 [2022-12-14 09:45:51,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:45:51,985 INFO L225 Difference]: With dead ends: 147 [2022-12-14 09:45:51,986 INFO L226 Difference]: Without dead ends: 145 [2022-12-14 09:45:51,987 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 524 GetRequests, 338 SyntacticMatches, 3 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6210 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=738, Invalid=33302, Unknown=0, NotChecked=0, Total=34040 [2022-12-14 09:45:51,987 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 54 mSDsluCounter, 3489 mSDsCounter, 0 mSdLazyCounter, 10580 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 3525 SdHoareTripleChecker+Invalid, 10616 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 10580 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2022-12-14 09:45:51,987 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 3525 Invalid, 10616 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 10580 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2022-12-14 09:45:51,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2022-12-14 09:45:52,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 143. [2022-12-14 09:45:52,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.0140845070422535) internal successors, (144), 142 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:45:52,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 144 transitions. [2022-12-14 09:45:52,084 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 144 transitions. Word has length 139 [2022-12-14 09:45:52,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:45:52,084 INFO L495 AbstractCegarLoop]: Abstraction has 143 states and 144 transitions. [2022-12-14 09:45:52,084 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 143 states, 143 states have (on average 1.9580419580419581) internal successors, (280), 143 states have internal predecessors, (280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:45:52,084 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 144 transitions. [2022-12-14 09:45:52,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2022-12-14 09:45:52,085 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:45:52,085 INFO L195 NwaCegarLoop]: trace histogram [35, 34, 34, 34, 1, 1, 1, 1, 1] [2022-12-14 09:45:52,090 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Ended with exit code 0 [2022-12-14 09:45:52,285 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2022-12-14 09:45:52,286 INFO L420 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:45:52,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:45:52,286 INFO L85 PathProgramCache]: Analyzing trace with hash -970865348, now seen corresponding path program 59 times [2022-12-14 09:45:52,287 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:45:52,287 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1531143529] [2022-12-14 09:45:52,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:45:52,287 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:45:52,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:45:53,927 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 1651 proven. 695 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:45:53,927 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:45:53,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1531143529] [2022-12-14 09:45:53,927 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1531143529] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:45:53,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [253349477] [2022-12-14 09:45:53,928 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:45:53,928 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:45:53,928 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:45:53,929 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:45:53,929 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2022-12-14 09:46:07,421 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2022-12-14 09:46:07,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:46:07,434 INFO L263 TraceCheckSpWp]: Trace formula consists of 699 conjuncts, 72 conjunts are in the unsatisfiable core [2022-12-14 09:46:07,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:46:09,108 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 1751 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:46:09,108 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:46:10,228 INFO L134 CoverageAnalysis]: Checked inductivity of 2346 backedges. 1751 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:46:10,228 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [253349477] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:46:10,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2088376349] [2022-12-14 09:46:10,229 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:46:10,229 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:46:10,229 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:46:10,229 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:46:10,229 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:46:10,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:46:10,246 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:46:10,246 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:46:10,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:46:10,263 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:46:10,263 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:46:10,276 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:46:10,277 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-12-14 09:46:10,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:46:10,302 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 09:46:10,324 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-12-14 09:46:10,324 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 202 [2022-12-14 09:46:10,359 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:46:10,388 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:46:10,736 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '51338#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:46:10,736 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:46:10,736 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:46:10,736 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 109 [2022-12-14 09:46:10,737 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [464023105] [2022-12-14 09:46:10,737 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:46:10,737 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2022-12-14 09:46:10,737 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:46:10,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2022-12-14 09:46:10,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2718, Invalid=10164, Unknown=0, NotChecked=0, Total=12882 [2022-12-14 09:46:10,738 INFO L87 Difference]: Start difference. First operand 143 states and 144 transitions. Second operand has 109 states, 109 states have (on average 2.311926605504587) internal successors, (252), 109 states have internal predecessors, (252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:46:11,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:46:11,758 INFO L93 Difference]: Finished difference Result 258 states and 260 transitions. [2022-12-14 09:46:11,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2022-12-14 09:46:11,759 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 109 states have (on average 2.311926605504587) internal successors, (252), 109 states have internal predecessors, (252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 142 [2022-12-14 09:46:11,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:46:11,759 INFO L225 Difference]: With dead ends: 258 [2022-12-14 09:46:11,759 INFO L226 Difference]: Without dead ends: 150 [2022-12-14 09:46:11,760 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 530 GetRequests, 315 SyntacticMatches, 69 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9017 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=4639, Invalid=17117, Unknown=0, NotChecked=0, Total=21756 [2022-12-14 09:46:11,760 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 382 mSDsluCounter, 342 mSDsCounter, 0 mSdLazyCounter, 779 mSolverCounterSat, 191 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 382 SdHoareTripleChecker+Valid, 379 SdHoareTripleChecker+Invalid, 970 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 191 IncrementalHoareTripleChecker+Valid, 779 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 09:46:11,760 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [382 Valid, 379 Invalid, 970 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [191 Valid, 779 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 09:46:11,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2022-12-14 09:46:11,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 144. [2022-12-14 09:46:11,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 143 states have (on average 1.013986013986014) internal successors, (145), 143 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:46:11,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 145 transitions. [2022-12-14 09:46:11,845 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 145 transitions. Word has length 142 [2022-12-14 09:46:11,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:46:11,845 INFO L495 AbstractCegarLoop]: Abstraction has 144 states and 145 transitions. [2022-12-14 09:46:11,845 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 109 states have (on average 2.311926605504587) internal successors, (252), 109 states have internal predecessors, (252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:46:11,845 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 145 transitions. [2022-12-14 09:46:11,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2022-12-14 09:46:11,845 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:46:11,845 INFO L195 NwaCegarLoop]: trace histogram [35, 35, 34, 34, 1, 1, 1, 1, 1] [2022-12-14 09:46:11,855 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Ended with exit code 0 [2022-12-14 09:46:12,046 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:46:12,046 INFO L420 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:46:12,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:46:12,047 INFO L85 PathProgramCache]: Analyzing trace with hash -368221406, now seen corresponding path program 60 times [2022-12-14 09:46:12,047 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:46:12,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1555322617] [2022-12-14 09:46:12,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:46:12,048 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:46:12,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:46:15,362 INFO L134 CoverageAnalysis]: Checked inductivity of 2381 backedges. 0 proven. 2381 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:46:15,362 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:46:15,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1555322617] [2022-12-14 09:46:15,362 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1555322617] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:46:15,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1813059204] [2022-12-14 09:46:15,362 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:46:15,362 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:46:15,363 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:46:15,363 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:46:15,364 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2022-12-14 09:46:17,924 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:46:17,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:46:17,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 708 conjuncts, 159 conjunts are in the unsatisfiable core [2022-12-14 09:46:17,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:46:19,828 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 09:46:23,505 INFO L134 CoverageAnalysis]: Checked inductivity of 2381 backedges. 0 proven. 2381 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:46:23,505 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:46:23,946 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:46:23,947 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:46:23,949 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:46:23,950 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:46:24,057 INFO L134 CoverageAnalysis]: Checked inductivity of 2381 backedges. 0 proven. 2381 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:46:24,057 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1813059204] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:46:24,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [70212959] [2022-12-14 09:46:24,058 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:46:24,058 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:46:24,058 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:46:24,059 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:46:24,059 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:46:24,068 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:46:24,079 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:46:24,079 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:46:24,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:46:24,086 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:46:24,097 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:46:24,098 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:46:24,123 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:46:24,125 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:46:24,133 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:46:24,133 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:46:24,156 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:46:24,184 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:46:24,904 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '52993#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:46:24,904 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:46:24,904 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:46:24,904 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 75, 75] total 149 [2022-12-14 09:46:24,905 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467985713] [2022-12-14 09:46:24,905 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:46:24,905 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 149 states [2022-12-14 09:46:24,905 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:46:24,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 149 interpolants. [2022-12-14 09:46:24,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=466, Invalid=23096, Unknown=0, NotChecked=0, Total=23562 [2022-12-14 09:46:24,906 INFO L87 Difference]: Start difference. First operand 144 states and 145 transitions. Second operand has 149 states, 149 states have (on average 1.9463087248322148) internal successors, (290), 149 states have internal predecessors, (290), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:46:30,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:46:30,013 INFO L93 Difference]: Finished difference Result 151 states and 152 transitions. [2022-12-14 09:46:30,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2022-12-14 09:46:30,013 INFO L78 Accepts]: Start accepts. Automaton has has 149 states, 149 states have (on average 1.9463087248322148) internal successors, (290), 149 states have internal predecessors, (290), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 143 [2022-12-14 09:46:30,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:46:30,013 INFO L225 Difference]: With dead ends: 151 [2022-12-14 09:46:30,014 INFO L226 Difference]: Without dead ends: 149 [2022-12-14 09:46:30,016 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 542 GetRequests, 346 SyntacticMatches, 3 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7124 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=804, Invalid=37026, Unknown=0, NotChecked=0, Total=37830 [2022-12-14 09:46:30,016 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 62 mSDsluCounter, 3455 mSDsCounter, 0 mSdLazyCounter, 11231 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 3491 SdHoareTripleChecker+Invalid, 11270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 11231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2022-12-14 09:46:30,016 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [62 Valid, 3491 Invalid, 11270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 11231 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2022-12-14 09:46:30,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2022-12-14 09:46:30,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 147. [2022-12-14 09:46:30,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 146 states have (on average 1.0136986301369864) internal successors, (148), 146 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:46:30,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 148 transitions. [2022-12-14 09:46:30,121 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 148 transitions. Word has length 143 [2022-12-14 09:46:30,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:46:30,121 INFO L495 AbstractCegarLoop]: Abstraction has 147 states and 148 transitions. [2022-12-14 09:46:30,121 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 149 states, 149 states have (on average 1.9463087248322148) internal successors, (290), 149 states have internal predecessors, (290), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:46:30,121 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 148 transitions. [2022-12-14 09:46:30,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2022-12-14 09:46:30,122 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:46:30,122 INFO L195 NwaCegarLoop]: trace histogram [36, 35, 35, 35, 1, 1, 1, 1, 1] [2022-12-14 09:46:30,131 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Ended with exit code 0 [2022-12-14 09:46:30,323 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:46:30,324 INFO L420 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:46:30,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:46:30,324 INFO L85 PathProgramCache]: Analyzing trace with hash -332638693, now seen corresponding path program 61 times [2022-12-14 09:46:30,325 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:46:30,325 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2128004646] [2022-12-14 09:46:30,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:46:30,325 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:46:30,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:46:32,377 INFO L134 CoverageAnalysis]: Checked inductivity of 2485 backedges. 1752 proven. 733 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:46:32,377 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:46:32,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2128004646] [2022-12-14 09:46:32,377 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2128004646] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:46:32,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [873102393] [2022-12-14 09:46:32,377 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:46:32,378 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:46:32,378 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:46:32,378 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:46:32,379 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2022-12-14 09:46:32,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:46:32,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 718 conjuncts, 74 conjunts are in the unsatisfiable core [2022-12-14 09:46:32,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:46:34,330 INFO L134 CoverageAnalysis]: Checked inductivity of 2485 backedges. 1855 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:46:34,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:46:35,628 INFO L134 CoverageAnalysis]: Checked inductivity of 2485 backedges. 1855 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:46:35,628 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [873102393] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:46:35,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1495639797] [2022-12-14 09:46:35,629 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:46:35,629 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:46:35,629 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:46:35,629 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:46:35,629 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:46:35,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:46:35,646 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:46:35,646 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:46:35,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:46:35,662 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:46:35,662 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:46:35,673 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:46:35,674 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:46:35,699 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:46:35,701 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:46:35,710 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:46:35,710 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:46:35,740 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:46:35,783 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:46:38,284 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '54505#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:46:38,285 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:46:38,285 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:46:38,285 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74, 74] total 112 [2022-12-14 09:46:38,285 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340274388] [2022-12-14 09:46:38,285 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:46:38,286 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 112 states [2022-12-14 09:46:38,286 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:46:38,287 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2022-12-14 09:46:38,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2867, Invalid=10705, Unknown=0, NotChecked=0, Total=13572 [2022-12-14 09:46:38,287 INFO L87 Difference]: Start difference. First operand 147 states and 148 transitions. Second operand has 112 states, 112 states have (on average 2.3125) internal successors, (259), 112 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:46:39,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:46:39,418 INFO L93 Difference]: Finished difference Result 265 states and 267 transitions. [2022-12-14 09:46:39,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2022-12-14 09:46:39,419 INFO L78 Accepts]: Start accepts. Automaton has has 112 states, 112 states have (on average 2.3125) internal successors, (259), 112 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 146 [2022-12-14 09:46:39,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:46:39,419 INFO L225 Difference]: With dead ends: 265 [2022-12-14 09:46:39,419 INFO L226 Difference]: Without dead ends: 154 [2022-12-14 09:46:39,420 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 545 GetRequests, 288 SyntacticMatches, 107 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13503 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=4897, Invalid=18055, Unknown=0, NotChecked=0, Total=22952 [2022-12-14 09:46:39,420 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 384 mSDsluCounter, 368 mSDsCounter, 0 mSdLazyCounter, 820 mSolverCounterSat, 192 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 384 SdHoareTripleChecker+Valid, 406 SdHoareTripleChecker+Invalid, 1012 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 192 IncrementalHoareTripleChecker+Valid, 820 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 09:46:39,420 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [384 Valid, 406 Invalid, 1012 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [192 Valid, 820 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 09:46:39,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2022-12-14 09:46:39,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 148. [2022-12-14 09:46:39,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 147 states have (on average 1.0136054421768708) internal successors, (149), 147 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:46:39,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 149 transitions. [2022-12-14 09:46:39,513 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 149 transitions. Word has length 146 [2022-12-14 09:46:39,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:46:39,513 INFO L495 AbstractCegarLoop]: Abstraction has 148 states and 149 transitions. [2022-12-14 09:46:39,513 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 112 states, 112 states have (on average 2.3125) internal successors, (259), 112 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:46:39,513 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 149 transitions. [2022-12-14 09:46:39,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2022-12-14 09:46:39,513 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:46:39,513 INFO L195 NwaCegarLoop]: trace histogram [36, 36, 35, 35, 1, 1, 1, 1, 1] [2022-12-14 09:46:39,519 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Forceful destruction successful, exit code 0 [2022-12-14 09:46:39,714 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:46:39,714 INFO L420 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:46:39,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:46:39,715 INFO L85 PathProgramCache]: Analyzing trace with hash -743796479, now seen corresponding path program 62 times [2022-12-14 09:46:39,715 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:46:39,716 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1895149988] [2022-12-14 09:46:39,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:46:39,716 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:46:39,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:46:42,979 INFO L134 CoverageAnalysis]: Checked inductivity of 2521 backedges. 0 proven. 2521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:46:42,979 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:46:42,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1895149988] [2022-12-14 09:46:42,979 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1895149988] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:46:42,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [117472924] [2022-12-14 09:46:42,980 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:46:42,980 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:46:42,980 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:46:42,981 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:46:42,981 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2022-12-14 09:47:26,286 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2022-12-14 09:47:26,286 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:47:26,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 727 conjuncts, 156 conjunts are in the unsatisfiable core [2022-12-14 09:47:26,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:47:26,367 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 15 treesize of output 11 [2022-12-14 09:47:28,805 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 47 treesize of output 23 [2022-12-14 09:47:28,861 INFO L134 CoverageAnalysis]: Checked inductivity of 2521 backedges. 0 proven. 2521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:47:28,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:47:29,236 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:47:29,237 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:47:29,240 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:47:29,240 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:47:29,306 INFO L134 CoverageAnalysis]: Checked inductivity of 2521 backedges. 0 proven. 2521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:47:29,306 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [117472924] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:47:29,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1746656573] [2022-12-14 09:47:29,307 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:47:29,307 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:47:29,307 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:47:29,307 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:47:29,307 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:47:29,313 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:47:29,320 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:47:29,321 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:47:29,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:47:29,333 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:47:29,334 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:47:29,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:47:29,345 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:47:29,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:47:29,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:47:29,380 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:47:29,381 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:47:29,409 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:47:29,441 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:47:32,836 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '56166#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:47:32,836 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:47:32,836 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:47:32,836 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76, 76] total 113 [2022-12-14 09:47:32,836 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266104473] [2022-12-14 09:47:32,836 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:47:32,837 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2022-12-14 09:47:32,837 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:47:32,838 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2022-12-14 09:47:32,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=314, Invalid=13492, Unknown=0, NotChecked=0, Total=13806 [2022-12-14 09:47:32,838 INFO L87 Difference]: Start difference. First operand 148 states and 149 transitions. Second operand has 113 states, 113 states have (on average 2.265486725663717) internal successors, (256), 113 states have internal predecessors, (256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:47:37,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:47:37,556 INFO L93 Difference]: Finished difference Result 155 states and 156 transitions. [2022-12-14 09:47:37,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2022-12-14 09:47:37,557 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 113 states have (on average 2.265486725663717) internal successors, (256), 113 states have internal predecessors, (256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 147 [2022-12-14 09:47:37,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:47:37,557 INFO L225 Difference]: With dead ends: 155 [2022-12-14 09:47:37,557 INFO L226 Difference]: Without dead ends: 153 [2022-12-14 09:47:37,558 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 554 GetRequests, 358 SyntacticMatches, 41 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4554 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=586, Invalid=23906, Unknown=0, NotChecked=0, Total=24492 [2022-12-14 09:47:37,558 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 53 mSDsluCounter, 3279 mSDsCounter, 0 mSdLazyCounter, 10041 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 3317 SdHoareTripleChecker+Invalid, 10078 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 10041 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2022-12-14 09:47:37,558 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 3317 Invalid, 10078 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 10041 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2022-12-14 09:47:37,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2022-12-14 09:47:37,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 151. [2022-12-14 09:47:37,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 150 states have (on average 1.0133333333333334) internal successors, (152), 150 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:47:37,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 152 transitions. [2022-12-14 09:47:37,652 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 152 transitions. Word has length 147 [2022-12-14 09:47:37,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:47:37,652 INFO L495 AbstractCegarLoop]: Abstraction has 151 states and 152 transitions. [2022-12-14 09:47:37,653 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 113 states, 113 states have (on average 2.265486725663717) internal successors, (256), 113 states have internal predecessors, (256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:47:37,653 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 152 transitions. [2022-12-14 09:47:37,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2022-12-14 09:47:37,653 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:47:37,653 INFO L195 NwaCegarLoop]: trace histogram [37, 36, 36, 36, 1, 1, 1, 1, 1] [2022-12-14 09:47:37,665 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Forceful destruction successful, exit code 0 [2022-12-14 09:47:37,854 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable63 [2022-12-14 09:47:37,854 INFO L420 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:47:37,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:47:37,855 INFO L85 PathProgramCache]: Analyzing trace with hash -699832356, now seen corresponding path program 63 times [2022-12-14 09:47:37,855 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:47:37,855 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1396369450] [2022-12-14 09:47:37,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:47:37,855 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:47:37,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:47:39,849 INFO L134 CoverageAnalysis]: Checked inductivity of 2628 backedges. 1856 proven. 772 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:47:39,849 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:47:39,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1396369450] [2022-12-14 09:47:39,849 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1396369450] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:47:39,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [382828699] [2022-12-14 09:47:39,849 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:47:39,849 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:47:39,849 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:47:39,850 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:47:39,851 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2022-12-14 09:47:43,447 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:47:43,447 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:47:43,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 737 conjuncts, 76 conjunts are in the unsatisfiable core [2022-12-14 09:47:43,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:47:45,128 INFO L134 CoverageAnalysis]: Checked inductivity of 2628 backedges. 1962 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:47:45,128 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:47:46,387 INFO L134 CoverageAnalysis]: Checked inductivity of 2628 backedges. 1962 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:47:46,388 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [382828699] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:47:46,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1296886900] [2022-12-14 09:47:46,389 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:47:46,389 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:47:46,389 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:47:46,389 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:47:46,389 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:47:46,398 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:47:46,406 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:47:46,406 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:47:46,413 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:47:46,423 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:47:46,423 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:47:46,435 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:47:46,436 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:47:46,459 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:47:46,461 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:47:46,469 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:47:46,469 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:47:46,505 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:47:46,533 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:47:48,814 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '57713#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:47:48,814 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:47:48,815 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:47:48,815 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76, 76] total 115 [2022-12-14 09:47:48,815 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506451669] [2022-12-14 09:47:48,815 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:47:48,816 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 115 states [2022-12-14 09:47:48,816 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:47:48,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2022-12-14 09:47:48,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3020, Invalid=11260, Unknown=0, NotChecked=0, Total=14280 [2022-12-14 09:47:48,818 INFO L87 Difference]: Start difference. First operand 151 states and 152 transitions. Second operand has 115 states, 115 states have (on average 2.3130434782608695) internal successors, (266), 115 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:47:49,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:47:49,817 INFO L93 Difference]: Finished difference Result 272 states and 274 transitions. [2022-12-14 09:47:49,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2022-12-14 09:47:49,818 INFO L78 Accepts]: Start accepts. Automaton has has 115 states, 115 states have (on average 2.3130434782608695) internal successors, (266), 115 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 150 [2022-12-14 09:47:49,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:47:49,818 INFO L225 Difference]: With dead ends: 272 [2022-12-14 09:47:49,818 INFO L226 Difference]: Without dead ends: 158 [2022-12-14 09:47:49,820 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 560 GetRequests, 296 SyntacticMatches, 110 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14230 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=5162, Invalid=19018, Unknown=0, NotChecked=0, Total=24180 [2022-12-14 09:47:49,820 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 522 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 670 mSolverCounterSat, 261 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 522 SdHoareTripleChecker+Valid, 325 SdHoareTripleChecker+Invalid, 931 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 261 IncrementalHoareTripleChecker+Valid, 670 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 09:47:49,820 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [522 Valid, 325 Invalid, 931 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [261 Valid, 670 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 09:47:49,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2022-12-14 09:47:49,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 152. [2022-12-14 09:47:49,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 151 states have (on average 1.0132450331125828) internal successors, (153), 151 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:47:49,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 153 transitions. [2022-12-14 09:47:49,936 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 153 transitions. Word has length 150 [2022-12-14 09:47:49,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:47:49,936 INFO L495 AbstractCegarLoop]: Abstraction has 152 states and 153 transitions. [2022-12-14 09:47:49,936 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 115 states, 115 states have (on average 2.3130434782608695) internal successors, (266), 115 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:47:49,937 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 153 transitions. [2022-12-14 09:47:49,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2022-12-14 09:47:49,937 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:47:49,937 INFO L195 NwaCegarLoop]: trace histogram [37, 37, 36, 36, 1, 1, 1, 1, 1] [2022-12-14 09:47:49,947 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Ended with exit code 0 [2022-12-14 09:47:50,138 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable64 [2022-12-14 09:47:50,139 INFO L420 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:47:50,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:47:50,140 INFO L85 PathProgramCache]: Analyzing trace with hash 214155202, now seen corresponding path program 64 times [2022-12-14 09:47:50,140 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:47:50,140 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [959010320] [2022-12-14 09:47:50,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:47:50,141 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:47:50,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:47:53,601 INFO L134 CoverageAnalysis]: Checked inductivity of 2665 backedges. 0 proven. 2665 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:47:53,601 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:47:53,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [959010320] [2022-12-14 09:47:53,602 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [959010320] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:47:53,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1209757902] [2022-12-14 09:47:53,602 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:47:53,602 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:47:53,602 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:47:53,603 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:47:53,603 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2022-12-14 09:47:53,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:47:53,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 746 conjuncts, 162 conjunts are in the unsatisfiable core [2022-12-14 09:47:53,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:47:56,074 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 09:47:59,592 INFO L134 CoverageAnalysis]: Checked inductivity of 2665 backedges. 0 proven. 2665 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:47:59,592 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:47:59,936 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:47:59,937 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:47:59,939 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:47:59,940 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:48:00,008 INFO L134 CoverageAnalysis]: Checked inductivity of 2665 backedges. 0 proven. 2665 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:48:00,008 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1209757902] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:48:00,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [250447411] [2022-12-14 09:48:00,009 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:48:00,009 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:48:00,009 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:48:00,009 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:48:00,009 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:48:00,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:48:00,029 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:48:00,029 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:48:00,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:48:00,043 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:48:00,043 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:48:00,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:48:00,060 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:48:00,084 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:48:00,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:48:00,094 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:48:00,094 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:48:00,124 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:48:00,154 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:48:04,448 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '59458#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:48:04,449 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:48:04,449 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:48:04,449 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 78, 78] total 155 [2022-12-14 09:48:04,449 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1923160694] [2022-12-14 09:48:04,449 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:48:04,449 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 155 states [2022-12-14 09:48:04,449 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:48:04,450 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2022-12-14 09:48:04,450 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=478, Invalid=24962, Unknown=0, NotChecked=0, Total=25440 [2022-12-14 09:48:04,451 INFO L87 Difference]: Start difference. First operand 152 states and 153 transitions. Second operand has 155 states, 155 states have (on average 1.961290322580645) internal successors, (304), 155 states have internal predecessors, (304), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:48:09,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:48:09,231 INFO L93 Difference]: Finished difference Result 159 states and 160 transitions. [2022-12-14 09:48:09,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2022-12-14 09:48:09,231 INFO L78 Accepts]: Start accepts. Automaton has has 155 states, 155 states have (on average 1.961290322580645) internal successors, (304), 155 states have internal predecessors, (304), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 151 [2022-12-14 09:48:09,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:48:09,232 INFO L225 Difference]: With dead ends: 159 [2022-12-14 09:48:09,232 INFO L226 Difference]: Without dead ends: 157 [2022-12-14 09:48:09,233 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 569 GetRequests, 331 SyntacticMatches, 40 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10248 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=798, Invalid=39002, Unknown=0, NotChecked=0, Total=39800 [2022-12-14 09:48:09,233 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 54 mSDsluCounter, 4088 mSDsCounter, 0 mSdLazyCounter, 12244 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 4127 SdHoareTripleChecker+Invalid, 12282 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 12244 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2022-12-14 09:48:09,233 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 4127 Invalid, 12282 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 12244 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2022-12-14 09:48:09,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2022-12-14 09:48:09,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 155. [2022-12-14 09:48:09,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 154 states have (on average 1.0129870129870129) internal successors, (156), 154 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:48:09,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 156 transitions. [2022-12-14 09:48:09,329 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 156 transitions. Word has length 151 [2022-12-14 09:48:09,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:48:09,329 INFO L495 AbstractCegarLoop]: Abstraction has 155 states and 156 transitions. [2022-12-14 09:48:09,329 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 155 states, 155 states have (on average 1.961290322580645) internal successors, (304), 155 states have internal predecessors, (304), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:48:09,329 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 156 transitions. [2022-12-14 09:48:09,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2022-12-14 09:48:09,330 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:48:09,330 INFO L195 NwaCegarLoop]: trace histogram [38, 37, 37, 37, 1, 1, 1, 1, 1] [2022-12-14 09:48:09,337 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Ended with exit code 0 [2022-12-14 09:48:09,530 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable65 [2022-12-14 09:48:09,531 INFO L420 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:48:09,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:48:09,532 INFO L85 PathProgramCache]: Analyzing trace with hash 1875981691, now seen corresponding path program 65 times [2022-12-14 09:48:09,532 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:48:09,532 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [709236718] [2022-12-14 09:48:09,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:48:09,533 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:48:09,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:48:11,503 INFO L134 CoverageAnalysis]: Checked inductivity of 2775 backedges. 1963 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:48:11,503 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:48:11,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [709236718] [2022-12-14 09:48:11,503 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [709236718] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:48:11,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1255239726] [2022-12-14 09:48:11,504 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:48:11,504 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:48:11,504 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:48:11,505 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:48:11,505 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2022-12-14 09:48:58,071 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2022-12-14 09:48:58,071 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:48:58,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 756 conjuncts, 78 conjunts are in the unsatisfiable core [2022-12-14 09:48:58,101 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:48:59,703 INFO L134 CoverageAnalysis]: Checked inductivity of 2775 backedges. 2072 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:48:59,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:49:00,943 INFO L134 CoverageAnalysis]: Checked inductivity of 2775 backedges. 2072 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:49:00,943 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1255239726] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:49:00,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1415659878] [2022-12-14 09:49:00,944 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:49:00,944 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:49:00,944 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:49:00,944 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:49:00,944 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:49:00,952 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:49:00,962 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:49:00,963 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:49:00,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:49:00,968 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:49:00,978 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:49:00,978 INFO L350 Elim1Store]: Elim1 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 26 treesize of output 28 [2022-12-14 09:49:01,001 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:49:01,002 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 09:49:01,020 INFO L321 Elim1Store]: treesize reduction 58, result has 26.6 percent of original size [2022-12-14 09:49:01,020 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 199 treesize of output 202 [2022-12-14 09:49:01,062 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:49:01,089 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:49:01,521 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '61046#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:49:01,521 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:49:01,521 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:49:01,521 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 78, 78] total 118 [2022-12-14 09:49:01,521 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [935682992] [2022-12-14 09:49:01,521 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:49:01,522 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 118 states [2022-12-14 09:49:01,522 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:49:01,522 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2022-12-14 09:49:01,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3177, Invalid=11829, Unknown=0, NotChecked=0, Total=15006 [2022-12-14 09:49:01,523 INFO L87 Difference]: Start difference. First operand 155 states and 156 transitions. Second operand has 118 states, 118 states have (on average 2.3135593220338984) internal successors, (273), 118 states have internal predecessors, (273), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:49:02,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:49:02,572 INFO L93 Difference]: Finished difference Result 279 states and 281 transitions. [2022-12-14 09:49:02,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2022-12-14 09:49:02,572 INFO L78 Accepts]: Start accepts. Automaton has has 118 states, 118 states have (on average 2.3135593220338984) internal successors, (273), 118 states have internal predecessors, (273), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 154 [2022-12-14 09:49:02,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:49:02,573 INFO L225 Difference]: With dead ends: 279 [2022-12-14 09:49:02,573 INFO L226 Difference]: Without dead ends: 162 [2022-12-14 09:49:02,575 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 575 GetRequests, 342 SyntacticMatches, 75 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10532 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=5434, Invalid=20006, Unknown=0, NotChecked=0, Total=25440 [2022-12-14 09:49:02,575 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 476 mSDsluCounter, 388 mSDsCounter, 0 mSdLazyCounter, 876 mSolverCounterSat, 238 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 476 SdHoareTripleChecker+Valid, 428 SdHoareTripleChecker+Invalid, 1114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 238 IncrementalHoareTripleChecker+Valid, 876 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 09:49:02,576 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [476 Valid, 428 Invalid, 1114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [238 Valid, 876 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 09:49:02,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2022-12-14 09:49:02,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 156. [2022-12-14 09:49:02,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 155 states have (on average 1.0129032258064516) internal successors, (157), 155 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:49:02,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 157 transitions. [2022-12-14 09:49:02,686 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 157 transitions. Word has length 154 [2022-12-14 09:49:02,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:49:02,686 INFO L495 AbstractCegarLoop]: Abstraction has 156 states and 157 transitions. [2022-12-14 09:49:02,686 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 118 states, 118 states have (on average 2.3135593220338984) internal successors, (273), 118 states have internal predecessors, (273), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:49:02,686 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 157 transitions. [2022-12-14 09:49:02,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2022-12-14 09:49:02,687 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:49:02,687 INFO L195 NwaCegarLoop]: trace histogram [38, 38, 37, 37, 1, 1, 1, 1, 1] [2022-12-14 09:49:02,704 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Ended with exit code 0 [2022-12-14 09:49:02,887 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2022-12-14 09:49:02,888 INFO L420 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:49:02,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:49:02,889 INFO L85 PathProgramCache]: Analyzing trace with hash -1343149471, now seen corresponding path program 66 times [2022-12-14 09:49:02,889 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:49:02,889 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [153725588] [2022-12-14 09:49:02,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:49:02,890 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:49:03,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:49:06,590 INFO L134 CoverageAnalysis]: Checked inductivity of 2813 backedges. 0 proven. 2813 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:49:06,590 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:49:06,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [153725588] [2022-12-14 09:49:06,590 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [153725588] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:49:06,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1748787943] [2022-12-14 09:49:06,590 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 09:49:06,590 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:49:06,591 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:49:06,591 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:49:06,592 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2022-12-14 09:49:11,915 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 09:49:11,915 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 09:49:11,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 765 conjuncts, 171 conjunts are in the unsatisfiable core [2022-12-14 09:49:11,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:49:14,246 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-12-14 09:49:17,834 INFO L134 CoverageAnalysis]: Checked inductivity of 2813 backedges. 0 proven. 2813 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:49:17,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:49:18,304 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:49:18,305 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:49:18,308 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 16 treesize of output 14 [2022-12-14 09:49:18,308 INFO L350 Elim1Store]: Elim1 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 24 treesize of output 20 [2022-12-14 09:49:18,380 INFO L134 CoverageAnalysis]: Checked inductivity of 2813 backedges. 0 proven. 2813 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:49:18,380 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1748787943] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:49:18,380 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [82439799] [2022-12-14 09:49:18,381 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:49:18,381 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:49:18,381 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:49:18,381 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:49:18,381 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:49:18,388 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:49:18,395 INFO L321 Elim1Store]: treesize reduction 15, result has 37.5 percent of original size [2022-12-14 09:49:18,395 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2022-12-14 09:49:18,403 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:49:18,411 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:49:18,411 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:49:18,425 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:49:18,425 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:49:18,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:49:18,451 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:49:18,461 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:49:18,462 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:49:18,487 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:49:18,523 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:49:23,203 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '62839#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:49:23,203 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:49:23,203 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:49:23,203 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 81, 81] total 161 [2022-12-14 09:49:23,203 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137460938] [2022-12-14 09:49:23,203 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:49:23,204 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 161 states [2022-12-14 09:49:23,204 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:49:23,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 161 interpolants. [2022-12-14 09:49:23,206 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=504, Invalid=26886, Unknown=0, NotChecked=0, Total=27390 [2022-12-14 09:49:23,206 INFO L87 Difference]: Start difference. First operand 156 states and 157 transitions. Second operand has 161 states, 161 states have (on average 1.937888198757764) internal successors, (312), 161 states have internal predecessors, (312), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:49:30,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:49:30,321 INFO L93 Difference]: Finished difference Result 163 states and 164 transitions. [2022-12-14 09:49:30,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2022-12-14 09:49:30,321 INFO L78 Accepts]: Start accepts. Automaton has has 161 states, 161 states have (on average 1.937888198757764) internal successors, (312), 161 states have internal predecessors, (312), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 155 [2022-12-14 09:49:30,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:49:30,322 INFO L225 Difference]: With dead ends: 163 [2022-12-14 09:49:30,322 INFO L226 Difference]: Without dead ends: 161 [2022-12-14 09:49:30,323 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 586 GetRequests, 338 SyntacticMatches, 41 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11384 ImplicationChecksByTransitivity, 14.7s TimeCoverageRelationStatistics Valid=855, Invalid=42617, Unknown=0, NotChecked=0, Total=43472 [2022-12-14 09:49:30,323 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 58 mSDsluCounter, 4128 mSDsCounter, 0 mSdLazyCounter, 13103 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 4167 SdHoareTripleChecker+Invalid, 13144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 13103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2022-12-14 09:49:30,323 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 4167 Invalid, 13144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 13103 Invalid, 0 Unknown, 0 Unchecked, 4.9s Time] [2022-12-14 09:49:30,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2022-12-14 09:49:30,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 159. [2022-12-14 09:49:30,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 158 states have (on average 1.0126582278481013) internal successors, (160), 158 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:49:30,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 160 transitions. [2022-12-14 09:49:30,419 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 160 transitions. Word has length 155 [2022-12-14 09:49:30,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:49:30,419 INFO L495 AbstractCegarLoop]: Abstraction has 159 states and 160 transitions. [2022-12-14 09:49:30,419 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 161 states, 161 states have (on average 1.937888198757764) internal successors, (312), 161 states have internal predecessors, (312), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:49:30,419 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 160 transitions. [2022-12-14 09:49:30,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2022-12-14 09:49:30,419 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:49:30,419 INFO L195 NwaCegarLoop]: trace histogram [39, 38, 38, 38, 1, 1, 1, 1, 1] [2022-12-14 09:49:30,429 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Ended with exit code 0 [2022-12-14 09:49:30,620 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67 [2022-12-14 09:49:30,620 INFO L420 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:49:30,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:49:30,620 INFO L85 PathProgramCache]: Analyzing trace with hash -1845767556, now seen corresponding path program 67 times [2022-12-14 09:49:30,620 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:49:30,620 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1056082860] [2022-12-14 09:49:30,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:49:30,620 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:49:30,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:49:32,886 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 2073 proven. 853 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:49:32,886 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:49:32,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1056082860] [2022-12-14 09:49:32,886 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1056082860] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:49:32,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [510307910] [2022-12-14 09:49:32,886 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 09:49:32,886 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:49:32,886 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:49:32,887 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:49:32,888 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2022-12-14 09:49:33,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:49:33,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 775 conjuncts, 80 conjunts are in the unsatisfiable core [2022-12-14 09:49:33,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 09:49:35,033 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 2185 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:49:35,033 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 09:49:36,542 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 2185 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:49:36,543 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [510307910] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 09:49:36,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1124895635] [2022-12-14 09:49:36,543 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-12-14 09:49:36,543 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 09:49:36,543 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 09:49:36,544 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 09:49:36,544 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 09:49:36,550 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:49:36,558 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-12-14 09:49:36,558 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-12-14 09:49:36,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:49:36,563 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 21 treesize of output 26 [2022-12-14 09:49:36,582 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:49:36,582 INFO L350 Elim1Store]: Elim1 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 33 treesize of output 35 [2022-12-14 09:49:36,609 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:49:36,611 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 09:49:36,621 INFO L321 Elim1Store]: treesize reduction 51, result has 12.1 percent of original size [2022-12-14 09:49:36,621 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 203 [2022-12-14 09:49:36,646 INFO L350 Elim1Store]: Elim1 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 0 case distinctions, treesize of input 18 treesize of output 14 [2022-12-14 09:49:36,673 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 09:49:38,997 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '64472#(and (<= 0 |ULTIMATE.start_main_~k~0#1|) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= ~N~0 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem2#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (< |ULTIMATE.start_main_~i~0#1| ~N~0) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= (ite (= |ULTIMATE.start_main_#t~mem2#1| |ULTIMATE.start_main_~i~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 09:49:38,997 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 09:49:38,997 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 09:49:38,998 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80, 80] total 121 [2022-12-14 09:49:38,998 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1269688456] [2022-12-14 09:49:38,998 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 09:49:38,998 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 121 states [2022-12-14 09:49:38,998 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 09:49:38,999 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 121 interpolants. [2022-12-14 09:49:38,999 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3338, Invalid=12412, Unknown=0, NotChecked=0, Total=15750 [2022-12-14 09:49:39,000 INFO L87 Difference]: Start difference. First operand 159 states and 160 transitions. Second operand has 121 states, 121 states have (on average 2.3140495867768593) internal successors, (280), 121 states have internal predecessors, (280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:49:40,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 09:49:40,062 INFO L93 Difference]: Finished difference Result 286 states and 288 transitions. [2022-12-14 09:49:40,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2022-12-14 09:49:40,062 INFO L78 Accepts]: Start accepts. Automaton has has 121 states, 121 states have (on average 2.3140495867768593) internal successors, (280), 121 states have internal predecessors, (280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 158 [2022-12-14 09:49:40,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 09:49:40,063 INFO L225 Difference]: With dead ends: 286 [2022-12-14 09:49:40,063 INFO L226 Difference]: Without dead ends: 166 [2022-12-14 09:49:40,064 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 590 GetRequests, 312 SyntacticMatches, 116 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15741 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=5713, Invalid=21019, Unknown=0, NotChecked=0, Total=26732 [2022-12-14 09:49:40,064 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 694 mSDsluCounter, 354 mSDsCounter, 0 mSdLazyCounter, 813 mSolverCounterSat, 347 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 694 SdHoareTripleChecker+Valid, 395 SdHoareTripleChecker+Invalid, 1160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 347 IncrementalHoareTripleChecker+Valid, 813 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 09:49:40,064 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [694 Valid, 395 Invalid, 1160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [347 Valid, 813 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 09:49:40,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2022-12-14 09:49:40,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 160. [2022-12-14 09:49:40,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 159 states have (on average 1.0125786163522013) internal successors, (161), 159 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:49:40,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 161 transitions. [2022-12-14 09:49:40,159 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 161 transitions. Word has length 158 [2022-12-14 09:49:40,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 09:49:40,159 INFO L495 AbstractCegarLoop]: Abstraction has 160 states and 161 transitions. [2022-12-14 09:49:40,160 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 121 states, 121 states have (on average 2.3140495867768593) internal successors, (280), 121 states have internal predecessors, (280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 09:49:40,160 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 161 transitions. [2022-12-14 09:49:40,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2022-12-14 09:49:40,160 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 09:49:40,160 INFO L195 NwaCegarLoop]: trace histogram [39, 39, 38, 38, 1, 1, 1, 1, 1] [2022-12-14 09:49:40,166 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Forceful destruction successful, exit code 0 [2022-12-14 09:49:40,361 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:49:40,361 INFO L420 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 09:49:40,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 09:49:40,362 INFO L85 PathProgramCache]: Analyzing trace with hash 631956578, now seen corresponding path program 68 times [2022-12-14 09:49:40,362 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 09:49:40,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1606508113] [2022-12-14 09:49:40,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 09:49:40,363 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 09:49:40,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 09:49:44,556 INFO L134 CoverageAnalysis]: Checked inductivity of 2965 backedges. 0 proven. 2965 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 09:49:44,557 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 09:49:44,557 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1606508113] [2022-12-14 09:49:44,557 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1606508113] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 09:49:44,557 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [177395141] [2022-12-14 09:49:44,557 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 09:49:44,557 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 09:49:44,557 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 09:49:44,558 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 09:49:44,558 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0cc33fd5-5b46-40fb-aa66-5b5f88182169/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process