./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum_const4.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 38b53e6a Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_const4.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash e61c61c9ffe0a2031cf5a0964b1882adcc5bdae1b7345aeaf1c374f155ad9e78 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-38b53e6 [2022-11-25 22:41:25,316 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-25 22:41:25,318 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-25 22:41:25,339 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-25 22:41:25,340 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-25 22:41:25,341 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-25 22:41:25,342 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-25 22:41:25,344 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-25 22:41:25,346 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-25 22:41:25,347 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-25 22:41:25,348 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-25 22:41:25,350 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-25 22:41:25,350 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-25 22:41:25,351 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-25 22:41:25,353 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-25 22:41:25,354 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-25 22:41:25,355 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-25 22:41:25,356 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-25 22:41:25,358 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-25 22:41:25,360 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-25 22:41:25,361 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-25 22:41:25,363 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-25 22:41:25,370 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-25 22:41:25,371 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-25 22:41:25,375 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-25 22:41:25,375 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-25 22:41:25,376 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-25 22:41:25,377 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-25 22:41:25,377 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-25 22:41:25,378 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-25 22:41:25,379 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-25 22:41:25,380 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-25 22:41:25,381 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-25 22:41:25,381 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-25 22:41:25,389 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-25 22:41:25,389 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-25 22:41:25,390 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-25 22:41:25,391 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-25 22:41:25,391 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-25 22:41:25,392 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-25 22:41:25,411 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-25 22:41:25,413 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-25 22:41:25,467 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-25 22:41:25,467 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-25 22:41:25,468 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-25 22:41:25,468 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-25 22:41:25,469 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-25 22:41:25,469 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-25 22:41:25,469 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-25 22:41:25,470 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-25 22:41:25,470 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-25 22:41:25,470 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-25 22:41:25,471 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-25 22:41:25,471 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-25 22:41:25,471 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-25 22:41:25,471 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-25 22:41:25,472 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-25 22:41:25,472 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-25 22:41:25,472 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-25 22:41:25,472 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-25 22:41:25,473 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-25 22:41:25,474 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-25 22:41:25,474 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-25 22:41:25,474 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-25 22:41:25,474 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-25 22:41:25,475 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-25 22:41:25,475 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-25 22:41:25,475 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-25 22:41:25,476 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-25 22:41:25,476 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-25 22:41:25,476 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-25 22:41:25,476 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-25 22:41:25,477 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-25 22:41:25,477 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-25 22:41:25,477 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 22:41:25,478 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-25 22:41:25,478 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-25 22:41:25,478 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-25 22:41:25,478 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-25 22:41:25,479 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-25 22:41:25,479 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-25 22:41:25,479 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-25 22:41:25,479 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-25 22:41:25,480 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_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e61c61c9ffe0a2031cf5a0964b1882adcc5bdae1b7345aeaf1c374f155ad9e78 [2022-11-25 22:41:25,723 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-25 22:41:25,761 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-25 22:41:25,781 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-25 22:41:25,782 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-25 22:41:25,783 INFO L275 PluginConnector]: CDTParser initialized [2022-11-25 22:41:25,784 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/../../sv-benchmarks/c/array-crafted/zero_sum_const4.c [2022-11-25 22:41:28,850 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-25 22:41:29,062 INFO L351 CDTParser]: Found 1 translation units. [2022-11-25 22:41:29,063 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/sv-benchmarks/c/array-crafted/zero_sum_const4.c [2022-11-25 22:41:29,070 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/data/b71d8d722/e57a0fa4253f4c9abf9627a43f63c7ea/FLAG100a1f900 [2022-11-25 22:41:29,086 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/data/b71d8d722/e57a0fa4253f4c9abf9627a43f63c7ea [2022-11-25 22:41:29,089 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-25 22:41:29,090 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-25 22:41:29,092 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-25 22:41:29,093 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-25 22:41:29,096 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-25 22:41:29,097 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 10:41:29" (1/1) ... [2022-11-25 22:41:29,098 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@26d1509a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:41:29, skipping insertion in model container [2022-11-25 22:41:29,099 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 10:41:29" (1/1) ... [2022-11-25 22:41:29,107 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-25 22:41:29,123 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-25 22:41:29,385 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_ca9eaaab-5e29-45ca-a08e-1d615f11a810/sv-benchmarks/c/array-crafted/zero_sum_const4.c[406,419] [2022-11-25 22:41:29,416 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 22:41:29,427 INFO L203 MainTranslator]: Completed pre-run [2022-11-25 22:41:29,440 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_ca9eaaab-5e29-45ca-a08e-1d615f11a810/sv-benchmarks/c/array-crafted/zero_sum_const4.c[406,419] [2022-11-25 22:41:29,457 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 22:41:29,474 INFO L208 MainTranslator]: Completed translation [2022-11-25 22:41:29,475 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:41:29 WrapperNode [2022-11-25 22:41:29,475 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-25 22:41:29,477 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-25 22:41:29,477 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-25 22:41:29,477 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-25 22:41:29,485 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:41:29" (1/1) ... [2022-11-25 22:41:29,506 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:41:29" (1/1) ... [2022-11-25 22:41:29,531 INFO L138 Inliner]: procedures = 16, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 126 [2022-11-25 22:41:29,534 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-25 22:41:29,535 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-25 22:41:29,535 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-25 22:41:29,536 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-25 22:41:29,544 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:41:29" (1/1) ... [2022-11-25 22:41:29,544 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:41:29" (1/1) ... [2022-11-25 22:41:29,546 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:41:29" (1/1) ... [2022-11-25 22:41:29,551 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:41:29" (1/1) ... [2022-11-25 22:41:29,557 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:41:29" (1/1) ... [2022-11-25 22:41:29,572 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:41:29" (1/1) ... [2022-11-25 22:41:29,576 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:41:29" (1/1) ... [2022-11-25 22:41:29,577 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:41:29" (1/1) ... [2022-11-25 22:41:29,579 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-25 22:41:29,580 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-25 22:41:29,580 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-25 22:41:29,580 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-25 22:41:29,586 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:41:29" (1/1) ... [2022-11-25 22:41:29,597 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 22:41:29,609 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:41:29,635 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-25 22:41:29,637 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-25 22:41:29,685 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-25 22:41:29,686 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-25 22:41:29,686 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-25 22:41:29,686 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-11-25 22:41:29,686 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-25 22:41:29,686 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-25 22:41:29,687 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-25 22:41:29,762 INFO L235 CfgBuilder]: Building ICFG [2022-11-25 22:41:29,764 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-25 22:41:29,969 INFO L276 CfgBuilder]: Performing block encoding [2022-11-25 22:41:30,038 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-25 22:41:30,038 INFO L300 CfgBuilder]: Removed 9 assume(true) statements. [2022-11-25 22:41:30,040 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 10:41:30 BoogieIcfgContainer [2022-11-25 22:41:30,041 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-25 22:41:30,043 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-25 22:41:30,043 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-25 22:41:30,047 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-25 22:41:30,047 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 10:41:29" (1/3) ... [2022-11-25 22:41:30,048 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a4a9fe7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 10:41:30, skipping insertion in model container [2022-11-25 22:41:30,048 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 10:41:29" (2/3) ... [2022-11-25 22:41:30,049 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a4a9fe7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 10:41:30, skipping insertion in model container [2022-11-25 22:41:30,049 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 10:41:30" (3/3) ... [2022-11-25 22:41:30,050 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum_const4.c [2022-11-25 22:41:30,094 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-25 22:41:30,094 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-25 22:41:30,177 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-25 22:41:30,183 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;@1062007f, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-25 22:41:30,184 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-25 22:41:30,188 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 15 states have (on average 1.8) internal successors, (27), 16 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:41:30,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-25 22:41:30,197 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:41:30,198 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:41:30,198 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:41:30,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:41:30,205 INFO L85 PathProgramCache]: Analyzing trace with hash -2021895563, now seen corresponding path program 1 times [2022-11-25 22:41:30,216 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:41:30,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [179996317] [2022-11-25 22:41:30,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:41:30,217 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:41:30,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:41:30,549 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:41:30,550 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:41:30,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [179996317] [2022-11-25 22:41:30,551 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [179996317] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 22:41:30,551 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 22:41:30,552 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-25 22:41:30,553 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [676419726] [2022-11-25 22:41:30,554 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 22:41:30,559 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 22:41:30,559 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:41:30,598 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 22:41:30,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 22:41:30,603 INFO L87 Difference]: Start difference. First operand has 17 states, 15 states have (on average 1.8) internal successors, (27), 16 states have internal predecessors, (27), 0 states have call successors, (0), 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 4.333333333333333) internal successors, (13), 3 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) [2022-11-25 22:41:30,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:41:30,725 INFO L93 Difference]: Finished difference Result 32 states and 51 transitions. [2022-11-25 22:41:30,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 22:41:30,728 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 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 13 [2022-11-25 22:41:30,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:41:30,736 INFO L225 Difference]: With dead ends: 32 [2022-11-25 22:41:30,737 INFO L226 Difference]: Without dead ends: 15 [2022-11-25 22:41:30,740 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 [2022-11-25 22:41:30,743 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 22:41:30,745 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 22:41:30,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-11-25 22:41:30,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-11-25 22:41:30,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:41:30,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 23 transitions. [2022-11-25 22:41:30,779 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 23 transitions. Word has length 13 [2022-11-25 22:41:30,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:41:30,779 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 23 transitions. [2022-11-25 22:41:30,779 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 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) [2022-11-25 22:41:30,780 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 23 transitions. [2022-11-25 22:41:30,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-25 22:41:30,780 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:41:30,780 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:41:30,781 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-25 22:41:30,781 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:41:30,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:41:30,782 INFO L85 PathProgramCache]: Analyzing trace with hash 688320013, now seen corresponding path program 1 times [2022-11-25 22:41:30,782 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:41:30,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [846843526] [2022-11-25 22:41:30,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:41:30,783 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:41:30,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:41:30,890 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 22:41:30,891 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:41:30,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [846843526] [2022-11-25 22:41:30,891 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [846843526] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 22:41:30,891 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 22:41:30,891 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-25 22:41:30,892 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [566131541] [2022-11-25 22:41:30,892 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 22:41:30,893 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-25 22:41:30,893 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:41:30,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-25 22:41:30,894 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-25 22:41:30,895 INFO L87 Difference]: Start difference. First operand 15 states and 23 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:41:30,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:41:30,962 INFO L93 Difference]: Finished difference Result 33 states and 55 transitions. [2022-11-25 22:41:30,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-25 22:41:30,963 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 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 [2022-11-25 22:41:30,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:41:30,964 INFO L225 Difference]: With dead ends: 33 [2022-11-25 22:41:30,964 INFO L226 Difference]: Without dead ends: 23 [2022-11-25 22:41:30,964 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-25 22:41:30,966 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 26 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 22:41:30,966 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 5 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 22:41:30,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-11-25 22:41:30,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-11-25 22:41:30,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:41:30,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 31 transitions. [2022-11-25 22:41:30,974 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 31 transitions. Word has length 14 [2022-11-25 22:41:30,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:41:30,975 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 31 transitions. [2022-11-25 22:41:30,975 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:41:30,975 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 31 transitions. [2022-11-25 22:41:30,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-25 22:41:30,976 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:41:30,976 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:41:30,976 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-25 22:41:30,977 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:41:30,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:41:30,978 INFO L85 PathProgramCache]: Analyzing trace with hash -628182144, now seen corresponding path program 1 times [2022-11-25 22:41:30,978 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:41:30,978 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1005767725] [2022-11-25 22:41:30,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:41:30,979 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:41:31,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:41:31,254 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-25 22:41:31,254 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:41:31,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1005767725] [2022-11-25 22:41:31,255 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1005767725] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:41:31,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [860645873] [2022-11-25 22:41:31,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:41:31,259 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:41:31,259 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:41:31,265 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:41:31,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-25 22:41:31,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:41:31,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-25 22:41:31,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:41:31,457 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-25 22:41:31,457 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:41:31,484 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-25 22:41:31,485 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [860645873] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:41:31,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [165087351] [2022-11-25 22:41:31,525 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 22:41:31,526 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:41:31,532 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:41:31,538 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:41:31,538 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:41:31,680 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 22:41:31,681 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-25 22:41:31,702 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-25 22:41:31,742 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 22:41:31,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:41:31,917 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:41:31,944 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 22:41:31,945 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 245 treesize of output 248 [2022-11-25 22:41:32,189 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 16 treesize of output 12 [2022-11-25 22:41:32,582 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:41:33,002 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '336#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 22:41:33,002 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:41:33,003 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:41:33,003 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2022-11-25 22:41:33,003 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340364670] [2022-11-25 22:41:33,003 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:41:33,004 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-25 22:41:33,004 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:41:33,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-25 22:41:33,005 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2022-11-25 22:41:33,006 INFO L87 Difference]: Start difference. First operand 23 states and 31 transitions. Second operand has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:41:33,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:41:33,076 INFO L93 Difference]: Finished difference Result 43 states and 59 transitions. [2022-11-25 22:41:33,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-25 22:41:33,077 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 0 states have call successors, (0), 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 [2022-11-25 22:41:33,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:41:33,078 INFO L225 Difference]: With dead ends: 43 [2022-11-25 22:41:33,078 INFO L226 Difference]: Without dead ends: 24 [2022-11-25 22:41:33,079 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 43 SyntacticMatches, 15 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2022-11-25 22:41:33,080 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 22:41:33,081 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 22:41:33,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-11-25 22:41:33,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2022-11-25 22:41:33,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.391304347826087) internal successors, (32), 23 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) [2022-11-25 22:41:33,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2022-11-25 22:41:33,086 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 22 [2022-11-25 22:41:33,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:41:33,087 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2022-11-25 22:41:33,087 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:41:33,087 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2022-11-25 22:41:33,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-25 22:41:33,088 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:41:33,088 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:41:33,104 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-25 22:41:33,294 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:41:33,294 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:41:33,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:41:33,295 INFO L85 PathProgramCache]: Analyzing trace with hash -681729304, now seen corresponding path program 2 times [2022-11-25 22:41:33,295 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:41:33,296 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1658137182] [2022-11-25 22:41:33,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:41:33,296 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:41:33,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:41:33,419 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 22:41:33,420 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:41:33,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1658137182] [2022-11-25 22:41:33,421 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1658137182] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:41:33,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2113812319] [2022-11-25 22:41:33,421 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 22:41:33,421 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:41:33,421 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:41:33,423 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:41:33,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-25 22:41:33,501 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-25 22:41:33,501 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:41:33,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-25 22:41:33,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:41:33,557 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 22:41:33,558 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:41:33,610 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 22:41:33,611 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2113812319] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:41:33,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [17494243] [2022-11-25 22:41:33,614 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 22:41:33,614 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:41:33,614 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:41:33,615 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:41:33,615 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:41:33,689 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 22:41:33,690 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-25 22:41:33,712 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-25 22:41:33,742 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 22:41:33,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:41:33,839 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:41:33,869 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 22:41:33,871 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 245 treesize of output 248 [2022-11-25 22:41:33,951 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 16 treesize of output 12 [2022-11-25 22:41:34,224 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:41:34,438 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '602#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 22:41:34,438 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:41:34,439 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:41:34,439 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2022-11-25 22:41:34,439 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550674066] [2022-11-25 22:41:34,439 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:41:34,440 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-25 22:41:34,440 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:41:34,441 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-25 22:41:34,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2022-11-25 22:41:34,441 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 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) [2022-11-25 22:41:34,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:41:34,562 INFO L93 Difference]: Finished difference Result 49 states and 71 transitions. [2022-11-25 22:41:34,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-25 22:41:34,564 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 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 23 [2022-11-25 22:41:34,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:41:34,566 INFO L225 Difference]: With dead ends: 49 [2022-11-25 22:41:34,566 INFO L226 Difference]: Without dead ends: 32 [2022-11-25 22:41:34,567 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 58 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2022-11-25 22:41:34,573 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 22:41:34,575 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 5 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 22:41:34,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-11-25 22:41:34,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-11-25 22:41:34,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 31 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) [2022-11-25 22:41:34,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2022-11-25 22:41:34,584 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 23 [2022-11-25 22:41:34,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:41:34,585 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2022-11-25 22:41:34,585 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 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) [2022-11-25 22:41:34,585 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2022-11-25 22:41:34,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-25 22:41:34,586 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:41:34,587 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:41:34,595 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-25 22:41:34,792 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:41:34,793 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:41:34,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:41:34,794 INFO L85 PathProgramCache]: Analyzing trace with hash -1504251819, now seen corresponding path program 3 times [2022-11-25 22:41:34,794 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:41:34,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1095033290] [2022-11-25 22:41:34,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:41:34,794 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:41:34,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:41:37,811 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:41:37,812 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:41:37,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1095033290] [2022-11-25 22:41:37,812 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1095033290] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:41:37,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1276592472] [2022-11-25 22:41:37,813 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 22:41:37,813 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:41:37,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:41:37,815 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:41:37,850 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-25 22:41:37,921 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 22:41:37,921 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:41:37,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 82 conjunts are in the unsatisfiable core [2022-11-25 22:41:37,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:41:38,353 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 24 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 22:41:38,354 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:41:38,848 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 22:41:38,848 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 35 treesize of output 51 [2022-11-25 22:41:38,930 INFO L321 Elim1Store]: treesize reduction 34, result has 20.9 percent of original size [2022-11-25 22:41:38,930 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 36 treesize of output 18 [2022-11-25 22:41:39,098 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:41:39,098 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1276592472] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:41:39,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [187858868] [2022-11-25 22:41:39,101 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 22:41:39,101 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:41:39,101 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:41:39,101 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:41:39,102 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:41:39,166 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 22:41:39,166 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-25 22:41:39,230 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 22:41:39,231 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-25 22:41:39,275 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-25 22:41:39,351 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:41:39,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:41:39,367 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 22:41:39,368 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 250 treesize of output 247 [2022-11-25 22:41:39,424 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 16 treesize of output 12 [2022-11-25 22:41:39,657 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:41:40,869 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '967#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 22:41:40,870 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:41:40,870 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:41:40,870 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 14] total 31 [2022-11-25 22:41:40,870 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524602491] [2022-11-25 22:41:40,870 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:41:40,871 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-25 22:41:40,871 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:41:40,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-25 22:41:40,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=1113, Unknown=0, NotChecked=0, Total=1260 [2022-11-25 22:41:40,872 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand has 31 states, 31 states have (on average 2.806451612903226) internal successors, (87), 31 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:41:41,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:41:41,828 INFO L93 Difference]: Finished difference Result 57 states and 72 transitions. [2022-11-25 22:41:41,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-25 22:41:41,829 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.806451612903226) internal successors, (87), 31 states have internal predecessors, (87), 0 states have call successors, (0), 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 [2022-11-25 22:41:41,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:41:41,830 INFO L225 Difference]: With dead ends: 57 [2022-11-25 22:41:41,830 INFO L226 Difference]: Without dead ends: 54 [2022-11-25 22:41:41,831 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 55 SyntacticMatches, 32 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 914 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=252, Invalid=1818, Unknown=0, NotChecked=0, Total=2070 [2022-11-25 22:41:41,831 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 8 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 425 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 472 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 425 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-25 22:41:41,832 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 21 Invalid, 472 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 425 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-25 22:41:41,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-11-25 22:41:41,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2022-11-25 22:41:41,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.3137254901960784) internal successors, (67), 51 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:41:41,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 67 transitions. [2022-11-25 22:41:41,854 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 67 transitions. Word has length 31 [2022-11-25 22:41:41,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:41:41,855 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 67 transitions. [2022-11-25 22:41:41,855 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.806451612903226) internal successors, (87), 31 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:41:41,855 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 67 transitions. [2022-11-25 22:41:41,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-25 22:41:41,857 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:41:41,857 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:41:41,863 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-25 22:41:42,063 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:41:42,064 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:41:42,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:41:42,064 INFO L85 PathProgramCache]: Analyzing trace with hash -2090822180, now seen corresponding path program 4 times [2022-11-25 22:41:42,064 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:41:42,064 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [96964245] [2022-11-25 22:41:42,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:41:42,064 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:41:42,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:41:42,228 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-25 22:41:42,228 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:41:42,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [96964245] [2022-11-25 22:41:42,229 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [96964245] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:41:42,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [626026693] [2022-11-25 22:41:42,229 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 22:41:42,229 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:41:42,229 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:41:42,231 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:41:42,241 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-25 22:41:42,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:41:42,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-25 22:41:42,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:41:42,405 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-25 22:41:42,405 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:41:42,470 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-25 22:41:42,470 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [626026693] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:41:42,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2055530089] [2022-11-25 22:41:42,473 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 22:41:42,473 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:41:42,474 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:41:42,474 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:41:42,474 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:41:42,537 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 22:41:42,538 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-25 22:41:42,607 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 22:41:42,608 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-25 22:41:42,656 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-25 22:41:42,724 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:41:42,727 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:41:42,739 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 22:41:42,740 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 250 treesize of output 247 [2022-11-25 22:41:42,789 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 16 treesize of output 12 [2022-11-25 22:41:43,013 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:41:43,633 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1397#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 22:41:43,633 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:41:43,633 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:41:43,634 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2022-11-25 22:41:43,634 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845639578] [2022-11-25 22:41:43,634 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:41:43,634 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-25 22:41:43,634 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:41:43,635 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-25 22:41:43,635 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2022-11-25 22:41:43,635 INFO L87 Difference]: Start difference. First operand 52 states and 67 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 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) [2022-11-25 22:41:43,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:41:43,921 INFO L93 Difference]: Finished difference Result 114 states and 149 transitions. [2022-11-25 22:41:43,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-25 22:41:43,922 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 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) Word has length 32 [2022-11-25 22:41:43,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:41:43,922 INFO L225 Difference]: With dead ends: 114 [2022-11-25 22:41:43,922 INFO L226 Difference]: Without dead ends: 65 [2022-11-25 22:41:43,923 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 58 SyntacticMatches, 28 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 433 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=100, Invalid=362, Unknown=0, NotChecked=0, Total=462 [2022-11-25 22:41:43,924 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 25 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 196 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 328 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 196 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 22:41:43,924 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 15 Invalid, 328 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [196 Valid, 132 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 22:41:43,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-11-25 22:41:43,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 58. [2022-11-25 22:41:43,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 57 states have (on average 1.263157894736842) internal successors, (72), 57 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) [2022-11-25 22:41:43,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 72 transitions. [2022-11-25 22:41:43,935 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 72 transitions. Word has length 32 [2022-11-25 22:41:43,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:41:43,936 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 72 transitions. [2022-11-25 22:41:43,936 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 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) [2022-11-25 22:41:43,936 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 72 transitions. [2022-11-25 22:41:43,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-25 22:41:43,937 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:41:43,937 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:41:43,943 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-11-25 22:41:44,142 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:41:44,143 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:41:44,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:41:44,143 INFO L85 PathProgramCache]: Analyzing trace with hash 293731444, now seen corresponding path program 5 times [2022-11-25 22:41:44,143 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:41:44,143 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2093002259] [2022-11-25 22:41:44,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:41:44,144 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:41:44,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:41:44,265 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-25 22:41:44,265 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:41:44,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2093002259] [2022-11-25 22:41:44,265 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2093002259] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:41:44,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1051381839] [2022-11-25 22:41:44,266 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 22:41:44,266 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:41:44,266 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:41:44,267 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:41:44,290 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-25 22:41:44,361 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-25 22:41:44,361 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:41:44,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-25 22:41:44,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:41:44,429 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-25 22:41:44,430 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:41:44,490 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-25 22:41:44,490 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1051381839] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:41:44,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1489390860] [2022-11-25 22:41:44,493 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 22:41:44,494 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:41:44,494 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:41:44,494 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:41:44,494 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:41:44,551 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 22:41:44,552 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-25 22:41:44,613 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 22:41:44,613 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-25 22:41:44,638 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 22:41:44,694 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:41:44,695 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:41:44,722 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 22:41:44,722 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 245 treesize of output 248 [2022-11-25 22:41:44,815 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 16 treesize of output 12 [2022-11-25 22:41:45,073 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:41:45,606 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1939#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 22:41:45,606 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:41:45,606 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:41:45,607 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2022-11-25 22:41:45,607 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [920891234] [2022-11-25 22:41:45,607 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:41:45,607 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-25 22:41:45,607 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:41:45,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-25 22:41:45,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2022-11-25 22:41:45,608 INFO L87 Difference]: Start difference. First operand 58 states and 72 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 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) [2022-11-25 22:41:45,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:41:45,872 INFO L93 Difference]: Finished difference Result 62 states and 76 transitions. [2022-11-25 22:41:45,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-25 22:41:45,873 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 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) Word has length 33 [2022-11-25 22:41:45,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:41:45,873 INFO L225 Difference]: With dead ends: 62 [2022-11-25 22:41:45,873 INFO L226 Difference]: Without dead ends: 41 [2022-11-25 22:41:45,874 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 62 SyntacticMatches, 27 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 473 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=111, Invalid=441, Unknown=0, NotChecked=0, Total=552 [2022-11-25 22:41:45,883 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 44 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 125 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 325 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 125 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 22:41:45,884 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 15 Invalid, 325 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [125 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 22:41:45,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-11-25 22:41:45,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-11-25 22:41:45,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.225) internal successors, (49), 40 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) [2022-11-25 22:41:45,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2022-11-25 22:41:45,892 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 33 [2022-11-25 22:41:45,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:41:45,892 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2022-11-25 22:41:45,892 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 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) [2022-11-25 22:41:45,893 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2022-11-25 22:41:45,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-25 22:41:45,893 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:41:45,894 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:41:45,903 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-25 22:41:46,094 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-25 22:41:46,095 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:41:46,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:41:46,095 INFO L85 PathProgramCache]: Analyzing trace with hash 487958048, now seen corresponding path program 6 times [2022-11-25 22:41:46,095 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:41:46,095 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1171207533] [2022-11-25 22:41:46,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:41:46,096 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:41:46,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:41:52,425 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:41:52,425 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:41:52,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1171207533] [2022-11-25 22:41:52,426 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1171207533] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:41:52,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1914959156] [2022-11-25 22:41:52,426 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 22:41:52,426 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:41:52,426 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:41:52,427 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:41:52,429 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-25 22:41:52,524 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 22:41:52,524 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:41:52,527 WARN L261 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 118 conjunts are in the unsatisfiable core [2022-11-25 22:41:52,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:41:52,633 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 15 treesize of output 11 [2022-11-25 22:41:54,831 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 3 proven. 48 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-25 22:41:54,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:41:56,312 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 53 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 22:41:56,313 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1914959156] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:41:56,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [257641944] [2022-11-25 22:41:56,315 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 22:41:56,315 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:41:56,316 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:41:56,316 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:41:56,316 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:41:56,381 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 22:41:56,387 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-25 22:41:56,402 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-25 22:41:56,422 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-25 22:41:56,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:41:56,477 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:41:56,489 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 22:41:56,489 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 250 treesize of output 247 [2022-11-25 22:41:56,532 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 16 treesize of output 12 [2022-11-25 22:41:56,738 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:41:59,517 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2443#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 22:41:59,517 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:41:59,517 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:41:59,517 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 18, 17] total 62 [2022-11-25 22:41:59,518 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722943524] [2022-11-25 22:41:59,518 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:41:59,518 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2022-11-25 22:41:59,518 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:41:59,519 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2022-11-25 22:41:59,521 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=310, Invalid=4112, Unknown=0, NotChecked=0, Total=4422 [2022-11-25 22:41:59,522 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand has 62 states, 62 states have (on average 1.8225806451612903) internal successors, (113), 62 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:42:11,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:42:11,284 INFO L93 Difference]: Finished difference Result 167 states and 216 transitions. [2022-11-25 22:42:11,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-11-25 22:42:11,285 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 1.8225806451612903) internal successors, (113), 62 states have internal predecessors, (113), 0 states have call successors, (0), 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 40 [2022-11-25 22:42:11,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:42:11,293 INFO L225 Difference]: With dead ends: 167 [2022-11-25 22:42:11,293 INFO L226 Difference]: Without dead ends: 133 [2022-11-25 22:42:11,298 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 53 SyntacticMatches, 39 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4469 ImplicationChecksByTransitivity, 15.5s TimeCoverageRelationStatistics Valid=1471, Invalid=11639, Unknown=0, NotChecked=0, Total=13110 [2022-11-25 22:42:11,300 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 208 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 2595 mSolverCounterSat, 1209 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 208 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 3804 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1209 IncrementalHoareTripleChecker+Valid, 2595 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2022-11-25 22:42:11,301 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [208 Valid, 53 Invalid, 3804 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1209 Valid, 2595 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2022-11-25 22:42:11,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2022-11-25 22:42:11,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 79. [2022-11-25 22:42:11,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 78 states have (on average 1.2435897435897436) internal successors, (97), 78 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) [2022-11-25 22:42:11,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 97 transitions. [2022-11-25 22:42:11,356 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 97 transitions. Word has length 40 [2022-11-25 22:42:11,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:42:11,356 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 97 transitions. [2022-11-25 22:42:11,356 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 1.8225806451612903) internal successors, (113), 62 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:42:11,356 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 97 transitions. [2022-11-25 22:42:11,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-11-25 22:42:11,361 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:42:11,361 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:42:11,375 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-25 22:42:11,567 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-25 22:42:11,567 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:42:11,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:42:11,567 INFO L85 PathProgramCache]: Analyzing trace with hash -2053464649, now seen corresponding path program 7 times [2022-11-25 22:42:11,568 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:42:11,568 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1407742538] [2022-11-25 22:42:11,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:42:11,568 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:42:11,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:42:11,725 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-25 22:42:11,726 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:42:11,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1407742538] [2022-11-25 22:42:11,726 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1407742538] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:42:11,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1191212994] [2022-11-25 22:42:11,726 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 22:42:11,727 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:42:11,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:42:11,728 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:42:11,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-25 22:42:11,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:42:11,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-25 22:42:11,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:42:11,965 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-25 22:42:11,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:42:12,073 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-25 22:42:12,073 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1191212994] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:42:12,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [296111737] [2022-11-25 22:42:12,075 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 22:42:12,075 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:42:12,075 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:42:12,075 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:42:12,075 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:42:12,133 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 22:42:12,133 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-25 22:42:12,189 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 22:42:12,189 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-25 22:42:12,211 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-25 22:42:12,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:12,271 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:12,283 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 22:42:12,283 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 250 treesize of output 247 [2022-11-25 22:42:12,332 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 16 treesize of output 12 [2022-11-25 22:42:12,521 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:42:13,269 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3277#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 22:42:13,270 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:42:13,270 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:42:13,270 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2022-11-25 22:42:13,270 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468343394] [2022-11-25 22:42:13,270 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:42:13,271 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-25 22:42:13,271 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:42:13,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-25 22:42:13,272 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=365, Unknown=0, NotChecked=0, Total=462 [2022-11-25 22:42:13,272 INFO L87 Difference]: Start difference. First operand 79 states and 97 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 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) [2022-11-25 22:42:13,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:42:13,637 INFO L93 Difference]: Finished difference Result 163 states and 203 transitions. [2022-11-25 22:42:13,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-25 22:42:13,637 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 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) Word has length 41 [2022-11-25 22:42:13,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:42:13,638 INFO L225 Difference]: With dead ends: 163 [2022-11-25 22:42:13,638 INFO L226 Difference]: Without dead ends: 50 [2022-11-25 22:42:13,639 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 75 SyntacticMatches, 37 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 680 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=130, Invalid=470, Unknown=0, NotChecked=0, Total=600 [2022-11-25 22:42:13,640 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 166 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 166 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 22:42:13,640 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 11 Invalid, 402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [166 Valid, 236 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 22:42:13,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-25 22:42:13,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-11-25 22:42:13,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.183673469387755) internal successors, (58), 49 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) [2022-11-25 22:42:13,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 58 transitions. [2022-11-25 22:42:13,660 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 58 transitions. Word has length 41 [2022-11-25 22:42:13,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:42:13,660 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 58 transitions. [2022-11-25 22:42:13,660 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 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) [2022-11-25 22:42:13,660 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 58 transitions. [2022-11-25 22:42:13,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-11-25 22:42:13,661 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:42:13,661 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:42:13,667 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-25 22:42:13,866 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:42:13,866 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:42:13,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:42:13,867 INFO L85 PathProgramCache]: Analyzing trace with hash 174183989, now seen corresponding path program 8 times [2022-11-25 22:42:13,867 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:42:13,867 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [141351925] [2022-11-25 22:42:13,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:42:13,867 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:42:14,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:42:21,354 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 1 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:42:21,354 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:42:21,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [141351925] [2022-11-25 22:42:21,354 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [141351925] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:42:21,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [141801612] [2022-11-25 22:42:21,355 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 22:42:21,355 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:42:21,355 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:42:21,356 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:42:21,360 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-25 22:42:21,456 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-25 22:42:21,456 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:42:21,460 WARN L261 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 154 conjunts are in the unsatisfiable core [2022-11-25 22:42:21,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:42:21,534 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 [2022-11-25 22:42:27,795 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:27,796 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:27,816 INFO L321 Elim1Store]: treesize reduction 25, result has 43.2 percent of original size [2022-11-25 22:42:27,816 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 30 treesize of output 27 [2022-11-25 22:42:28,026 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 4 proven. 80 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-25 22:42:28,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:42:33,570 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 33 treesize of output 29 [2022-11-25 22:42:33,582 INFO L321 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-11-25 22:42:33,582 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 84 treesize of output 68 [2022-11-25 22:42:33,669 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-25 22:42:33,670 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [141801612] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:42:33,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [156677327] [2022-11-25 22:42:33,673 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 22:42:33,673 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:42:33,673 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:42:33,673 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:42:33,674 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:42:33,732 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 22:42:33,733 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-25 22:42:33,788 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 22:42:33,788 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-25 22:42:33,810 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-25 22:42:33,865 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:33,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:33,879 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 22:42:33,880 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 250 treesize of output 247 [2022-11-25 22:42:33,923 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 16 treesize of output 12 [2022-11-25 22:42:34,112 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:42:34,833 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4078#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 22:42:34,833 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:42:34,833 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:42:34,833 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 27, 28] total 89 [2022-11-25 22:42:34,833 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193520753] [2022-11-25 22:42:34,833 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:42:34,834 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2022-11-25 22:42:34,834 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:42:34,835 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2022-11-25 22:42:34,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=606, Invalid=8135, Unknown=1, NotChecked=0, Total=8742 [2022-11-25 22:42:34,838 INFO L87 Difference]: Start difference. First operand 50 states and 58 transitions. Second operand has 89 states, 89 states have (on average 1.550561797752809) internal successors, (138), 89 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:42:50,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:42:50,455 INFO L93 Difference]: Finished difference Result 203 states and 246 transitions. [2022-11-25 22:42:50,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-11-25 22:42:50,456 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 89 states have (on average 1.550561797752809) internal successors, (138), 89 states have internal predecessors, (138), 0 states have call successors, (0), 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 49 [2022-11-25 22:42:50,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:42:50,459 INFO L225 Difference]: With dead ends: 203 [2022-11-25 22:42:50,459 INFO L226 Difference]: Without dead ends: 122 [2022-11-25 22:42:50,464 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 77 SyntacticMatches, 24 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5756 ImplicationChecksByTransitivity, 24.5s TimeCoverageRelationStatistics Valid=1720, Invalid=17185, Unknown=1, NotChecked=0, Total=18906 [2022-11-25 22:42:50,465 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 176 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 3292 mSolverCounterSat, 996 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 176 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 4288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 996 IncrementalHoareTripleChecker+Valid, 3292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2022-11-25 22:42:50,465 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [176 Valid, 145 Invalid, 4288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [996 Valid, 3292 Invalid, 0 Unknown, 0 Unchecked, 4.3s Time] [2022-11-25 22:42:50,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2022-11-25 22:42:50,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 104. [2022-11-25 22:42:50,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 103 states have (on average 1.1941747572815533) internal successors, (123), 103 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:42:50,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 123 transitions. [2022-11-25 22:42:50,507 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 123 transitions. Word has length 49 [2022-11-25 22:42:50,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:42:50,507 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 123 transitions. [2022-11-25 22:42:50,507 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 89 states, 89 states have (on average 1.550561797752809) internal successors, (138), 89 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:42:50,508 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 123 transitions. [2022-11-25 22:42:50,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-25 22:42:50,508 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:42:50,508 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:42:50,515 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-11-25 22:42:50,713 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:42:50,714 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:42:50,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:42:50,714 INFO L85 PathProgramCache]: Analyzing trace with hash -1482292140, now seen corresponding path program 9 times [2022-11-25 22:42:50,714 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:42:50,714 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882591416] [2022-11-25 22:42:50,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:42:50,715 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:42:50,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:42:50,915 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2022-11-25 22:42:50,915 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:42:50,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882591416] [2022-11-25 22:42:50,915 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [882591416] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:42:50,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [804635991] [2022-11-25 22:42:50,915 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 22:42:50,915 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:42:50,916 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:42:50,919 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:42:50,942 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-25 22:42:51,018 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 22:42:51,018 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:42:51,020 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-25 22:42:51,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:42:51,124 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2022-11-25 22:42:51,125 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:42:51,218 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2022-11-25 22:42:51,219 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [804635991] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:42:51,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1673504625] [2022-11-25 22:42:51,220 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 22:42:51,221 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:42:51,221 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:42:51,221 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:42:51,221 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:42:51,276 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 22:42:51,277 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-25 22:42:51,332 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 22:42:51,332 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-25 22:42:51,358 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 22:42:51,439 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:42:51,440 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:42:51,462 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 22:42:51,463 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 245 treesize of output 248 [2022-11-25 22:42:51,516 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 16 treesize of output 12 [2022-11-25 22:42:51,702 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:42:52,513 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5087#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 22:42:52,513 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:42:52,513 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:42:52,513 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2022-11-25 22:42:52,514 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [601918482] [2022-11-25 22:42:52,514 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:42:52,514 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-25 22:42:52,514 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:42:52,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-25 22:42:52,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=479, Unknown=0, NotChecked=0, Total=600 [2022-11-25 22:42:52,515 INFO L87 Difference]: Start difference. First operand 104 states and 123 transitions. Second operand has 20 states, 20 states have (on average 2.25) internal successors, (45), 20 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) [2022-11-25 22:42:52,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:42:52,870 INFO L93 Difference]: Finished difference Result 144 states and 175 transitions. [2022-11-25 22:42:52,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-25 22:42:52,871 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 20 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) Word has length 51 [2022-11-25 22:42:52,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:42:52,871 INFO L225 Difference]: With dead ends: 144 [2022-11-25 22:42:52,872 INFO L226 Difference]: Without dead ends: 59 [2022-11-25 22:42:52,872 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 97 SyntacticMatches, 45 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1164 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=192, Invalid=800, Unknown=0, NotChecked=0, Total=992 [2022-11-25 22:42:52,873 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 32 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 333 mSolverCounterSat, 171 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 504 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 171 IncrementalHoareTripleChecker+Valid, 333 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 22:42:52,873 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 11 Invalid, 504 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [171 Valid, 333 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 22:42:52,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-11-25 22:42:52,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2022-11-25 22:42:52,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.1551724137931034) internal successors, (67), 58 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:42:52,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 67 transitions. [2022-11-25 22:42:52,902 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 67 transitions. Word has length 51 [2022-11-25 22:42:52,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:42:52,902 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 67 transitions. [2022-11-25 22:42:52,902 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 20 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) [2022-11-25 22:42:52,903 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 67 transitions. [2022-11-25 22:42:52,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-25 22:42:52,903 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:42:52,903 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:42:52,914 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-25 22:42:53,108 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-25 22:42:53,109 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:42:53,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:42:53,109 INFO L85 PathProgramCache]: Analyzing trace with hash 1772327104, now seen corresponding path program 10 times [2022-11-25 22:42:53,109 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:42:53,110 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [865500007] [2022-11-25 22:42:53,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:42:53,110 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:42:53,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:43:03,571 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 3 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:43:03,571 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:43:03,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [865500007] [2022-11-25 22:43:03,572 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [865500007] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:43:03,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2003050007] [2022-11-25 22:43:03,572 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 22:43:03,572 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:43:03,572 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:43:03,573 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:43:03,580 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-25 22:43:03,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:43:03,685 WARN L261 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 182 conjunts are in the unsatisfiable core [2022-11-25 22:43:03,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:43:03,956 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 [2022-11-25 22:43:06,244 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:43:06,244 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:43:07,923 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-25 22:43:07,923 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2003050007] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:43:07,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2088925184] [2022-11-25 22:43:07,925 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 22:43:07,925 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:43:07,925 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:43:07,925 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:43:07,926 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:43:07,988 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 22:43:07,988 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-25 22:43:07,999 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-25 22:43:08,020 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 22:43:08,067 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:08,068 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:43:08,090 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 22:43:08,091 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 245 treesize of output 248 [2022-11-25 22:43:08,178 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 16 treesize of output 12 [2022-11-25 22:43:08,350 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:43:08,974 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5916#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 22:43:08,974 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:43:08,974 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:43:08,974 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 20, 15] total 74 [2022-11-25 22:43:08,974 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1848509062] [2022-11-25 22:43:08,975 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:43:08,975 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2022-11-25 22:43:08,975 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:43:08,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2022-11-25 22:43:08,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=301, Invalid=5861, Unknown=0, NotChecked=0, Total=6162 [2022-11-25 22:43:08,978 INFO L87 Difference]: Start difference. First operand 59 states and 67 transitions. Second operand has 74 states, 74 states have (on average 2.189189189189189) internal successors, (162), 74 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:43:18,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:43:18,057 INFO L93 Difference]: Finished difference Result 179 states and 211 transitions. [2022-11-25 22:43:18,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-25 22:43:18,057 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 2.189189189189189) internal successors, (162), 74 states have internal predecessors, (162), 0 states have call successors, (0), 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 58 [2022-11-25 22:43:18,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:43:18,058 INFO L225 Difference]: With dead ends: 179 [2022-11-25 22:43:18,059 INFO L226 Difference]: Without dead ends: 131 [2022-11-25 22:43:18,061 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 128 SyntacticMatches, 24 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3289 ImplicationChecksByTransitivity, 13.0s TimeCoverageRelationStatistics Valid=859, Invalid=10697, Unknown=0, NotChecked=0, Total=11556 [2022-11-25 22:43:18,062 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 119 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 3195 mSolverCounterSat, 926 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 4121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 926 IncrementalHoareTripleChecker+Valid, 3195 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2022-11-25 22:43:18,062 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [119 Valid, 59 Invalid, 4121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [926 Valid, 3195 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2022-11-25 22:43:18,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2022-11-25 22:43:18,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 110. [2022-11-25 22:43:18,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 109 states have (on average 1.146788990825688) internal successors, (125), 109 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) [2022-11-25 22:43:18,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 125 transitions. [2022-11-25 22:43:18,135 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 125 transitions. Word has length 58 [2022-11-25 22:43:18,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:43:18,136 INFO L495 AbstractCegarLoop]: Abstraction has 110 states and 125 transitions. [2022-11-25 22:43:18,136 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 2.189189189189189) internal successors, (162), 74 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:43:18,136 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 125 transitions. [2022-11-25 22:43:18,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-25 22:43:18,137 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:43:18,137 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:43:18,147 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-25 22:43:18,342 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-25 22:43:18,343 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:43:18,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:43:18,343 INFO L85 PathProgramCache]: Analyzing trace with hash -892729577, now seen corresponding path program 11 times [2022-11-25 22:43:18,343 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:43:18,343 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1160826010] [2022-11-25 22:43:18,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:43:18,343 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:43:18,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:43:18,554 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-11-25 22:43:18,555 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:43:18,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1160826010] [2022-11-25 22:43:18,555 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1160826010] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:43:18,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1585325805] [2022-11-25 22:43:18,555 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 22:43:18,555 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:43:18,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:43:18,559 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:43:18,570 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-25 22:43:18,685 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-25 22:43:18,685 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:43:18,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-25 22:43:18,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:43:18,870 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-11-25 22:43:18,870 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:43:19,009 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2022-11-25 22:43:19,009 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1585325805] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:43:19,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [227740706] [2022-11-25 22:43:19,011 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 22:43:19,011 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:43:19,011 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:43:19,011 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:43:19,012 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:43:19,073 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 22:43:19,074 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-25 22:43:19,088 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-25 22:43:19,108 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 22:43:19,150 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:19,152 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:43:19,174 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 22:43:19,174 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 245 treesize of output 248 [2022-11-25 22:43:19,256 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 16 treesize of output 12 [2022-11-25 22:43:19,422 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:43:19,655 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6913#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 22:43:19,656 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:43:19,656 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:43:19,656 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2022-11-25 22:43:19,657 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1310092513] [2022-11-25 22:43:19,657 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:43:19,657 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-25 22:43:19,657 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:43:19,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-25 22:43:19,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=599, Unknown=0, NotChecked=0, Total=756 [2022-11-25 22:43:19,659 INFO L87 Difference]: Start difference. First operand 110 states and 125 transitions. Second operand has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 23 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:43:20,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:43:20,148 INFO L93 Difference]: Finished difference Result 191 states and 219 transitions. [2022-11-25 22:43:20,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-25 22:43:20,148 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 23 states have internal predecessors, (51), 0 states have call successors, (0), 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 [2022-11-25 22:43:20,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:43:20,149 INFO L225 Difference]: With dead ends: 191 [2022-11-25 22:43:20,149 INFO L226 Difference]: Without dead ends: 68 [2022-11-25 22:43:20,150 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 157 SyntacticMatches, 12 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 456 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=227, Invalid=829, Unknown=0, NotChecked=0, Total=1056 [2022-11-25 22:43:20,150 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 6 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 349 mSolverCounterSat, 302 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 651 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 302 IncrementalHoareTripleChecker+Valid, 349 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 22:43:20,151 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 13 Invalid, 651 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [302 Valid, 349 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 22:43:20,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-11-25 22:43:20,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2022-11-25 22:43:20,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.1343283582089552) internal successors, (76), 67 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) [2022-11-25 22:43:20,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 76 transitions. [2022-11-25 22:43:20,184 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 76 transitions. Word has length 59 [2022-11-25 22:43:20,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:43:20,185 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 76 transitions. [2022-11-25 22:43:20,185 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 23 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:43:20,185 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 76 transitions. [2022-11-25 22:43:20,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-11-25 22:43:20,186 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:43:20,186 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:43:20,192 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-25 22:43:20,392 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:43:20,392 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:43:20,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:43:20,393 INFO L85 PathProgramCache]: Analyzing trace with hash 1455883285, now seen corresponding path program 12 times [2022-11-25 22:43:20,393 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:43:20,393 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1749923529] [2022-11-25 22:43:20,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:43:20,393 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:43:20,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:43:34,489 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 5 proven. 184 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:43:34,489 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:43:34,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1749923529] [2022-11-25 22:43:34,489 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1749923529] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:43:34,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [970569124] [2022-11-25 22:43:34,489 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 22:43:34,489 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:43:34,490 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:43:34,490 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:43:34,502 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-25 22:43:34,626 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 22:43:34,626 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:43:34,631 WARN L261 TraceCheckSpWp]: Trace formula consists of 361 conjuncts, 208 conjunts are in the unsatisfiable core [2022-11-25 22:43:34,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:43:38,248 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 6 proven. 168 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-25 22:43:38,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:43:41,854 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 22:43:41,855 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 104 treesize of output 408 [2022-11-25 22:43:45,236 INFO L321 Elim1Store]: treesize reduction 366, result has 6.4 percent of original size [2022-11-25 22:43:45,236 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 103 treesize of output 41 [2022-11-25 22:43:45,559 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 174 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-25 22:43:45,559 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [970569124] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:43:45,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1356153190] [2022-11-25 22:43:45,561 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 22:43:45,562 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:43:45,562 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:43:45,562 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:43:45,562 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:43:45,619 INFO L321 Elim1Store]: treesize reduction 42, result has 40.0 percent of original size [2022-11-25 22:43:45,619 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 26 treesize of output 46 [2022-11-25 22:43:45,670 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 22:43:45,671 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-25 22:43:45,700 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-25 22:43:45,751 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:45,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:43:45,765 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 22:43:45,765 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 250 treesize of output 247 [2022-11-25 22:43:45,807 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 16 treesize of output 12 [2022-11-25 22:43:45,954 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:43:46,692 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7928#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 22:43:46,692 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:43:46,692 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:43:46,692 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 20, 25] total 94 [2022-11-25 22:43:46,693 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091014944] [2022-11-25 22:43:46,693 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:43:46,693 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2022-11-25 22:43:46,693 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:43:46,694 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2022-11-25 22:43:46,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=527, Invalid=9175, Unknown=0, NotChecked=0, Total=9702 [2022-11-25 22:43:46,696 INFO L87 Difference]: Start difference. First operand 68 states and 76 transitions. Second operand has 94 states, 94 states have (on average 1.9893617021276595) internal successors, (187), 94 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:44:16,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:44:16,151 INFO L93 Difference]: Finished difference Result 434 states and 516 transitions. [2022-11-25 22:44:16,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2022-11-25 22:44:16,152 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 1.9893617021276595) internal successors, (187), 94 states have internal predecessors, (187), 0 states have call successors, (0), 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 [2022-11-25 22:44:16,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:44:16,153 INFO L225 Difference]: With dead ends: 434 [2022-11-25 22:44:16,154 INFO L226 Difference]: Without dead ends: 322 [2022-11-25 22:44:16,157 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 142 SyntacticMatches, 26 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11433 ImplicationChecksByTransitivity, 33.5s TimeCoverageRelationStatistics Valid=3250, Invalid=34580, Unknown=0, NotChecked=0, Total=37830 [2022-11-25 22:44:16,158 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 72 mSDsluCounter, 164 mSDsCounter, 0 mSdLazyCounter, 5630 mSolverCounterSat, 2092 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 169 SdHoareTripleChecker+Invalid, 7722 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2092 IncrementalHoareTripleChecker+Valid, 5630 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.9s IncrementalHoareTripleChecker+Time [2022-11-25 22:44:16,158 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 169 Invalid, 7722 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2092 Valid, 5630 Invalid, 0 Unknown, 0 Unchecked, 6.9s Time] [2022-11-25 22:44:16,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2022-11-25 22:44:16,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 206. [2022-11-25 22:44:16,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 205 states have (on average 1.1951219512195121) internal successors, (245), 205 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) [2022-11-25 22:44:16,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 245 transitions. [2022-11-25 22:44:16,283 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 245 transitions. Word has length 67 [2022-11-25 22:44:16,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:44:16,284 INFO L495 AbstractCegarLoop]: Abstraction has 206 states and 245 transitions. [2022-11-25 22:44:16,284 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 94 states have (on average 1.9893617021276595) internal successors, (187), 94 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:44:16,284 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 245 transitions. [2022-11-25 22:44:16,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2022-11-25 22:44:16,285 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:44:16,285 INFO L195 NwaCegarLoop]: trace histogram [9, 7, 7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:44:16,296 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-11-25 22:44:16,491 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-25 22:44:16,491 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:44:16,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:44:16,492 INFO L85 PathProgramCache]: Analyzing trace with hash -1793919427, now seen corresponding path program 13 times [2022-11-25 22:44:16,492 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:44:16,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [887566875] [2022-11-25 22:44:16,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:44:16,492 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:44:16,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:44:16,800 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 178 trivial. 0 not checked. [2022-11-25 22:44:16,800 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:44:16,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [887566875] [2022-11-25 22:44:16,800 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [887566875] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:44:16,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [201844583] [2022-11-25 22:44:16,801 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 22:44:16,801 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:44:16,801 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:44:16,803 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:44:16,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-25 22:44:16,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:44:16,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 388 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-25 22:44:16,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:44:17,277 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 44 proven. 28 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2022-11-25 22:44:17,277 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:44:17,580 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 44 proven. 28 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2022-11-25 22:44:17,580 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [201844583] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:44:17,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [974539608] [2022-11-25 22:44:17,581 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 22:44:17,582 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:44:17,582 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:44:17,582 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:44:17,582 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:44:17,648 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 22:44:17,649 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-25 22:44:17,659 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-25 22:44:17,680 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 22:44:17,720 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:44:17,720 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:44:17,742 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 22:44:17,743 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 245 treesize of output 248 [2022-11-25 22:44:17,822 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 16 treesize of output 12 [2022-11-25 22:44:17,978 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:44:19,876 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9847#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 22:44:19,876 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:44:19,876 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:44:19,876 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 18, 18] total 41 [2022-11-25 22:44:19,877 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202987644] [2022-11-25 22:44:19,877 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:44:19,877 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-11-25 22:44:19,877 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:44:19,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-11-25 22:44:19,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=312, Invalid=1758, Unknown=0, NotChecked=0, Total=2070 [2022-11-25 22:44:19,879 INFO L87 Difference]: Start difference. First operand 206 states and 245 transitions. Second operand has 41 states, 41 states have (on average 1.5853658536585367) internal successors, (65), 41 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) [2022-11-25 22:44:21,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:44:21,356 INFO L93 Difference]: Finished difference Result 430 states and 527 transitions. [2022-11-25 22:44:21,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-25 22:44:21,356 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.5853658536585367) internal successors, (65), 41 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) Word has length 72 [2022-11-25 22:44:21,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:44:21,358 INFO L225 Difference]: With dead ends: 430 [2022-11-25 22:44:21,358 INFO L226 Difference]: Without dead ends: 242 [2022-11-25 22:44:21,359 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 129 SyntacticMatches, 58 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3199 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=726, Invalid=4104, Unknown=0, NotChecked=0, Total=4830 [2022-11-25 22:44:21,359 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 152 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 724 mSolverCounterSat, 908 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 1632 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 908 IncrementalHoareTripleChecker+Valid, 724 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-25 22:44:21,360 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [152 Valid, 21 Invalid, 1632 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [908 Valid, 724 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-25 22:44:21,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2022-11-25 22:44:21,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 149. [2022-11-25 22:44:21,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 148 states have (on average 1.114864864864865) internal successors, (165), 148 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:44:21,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 165 transitions. [2022-11-25 22:44:21,457 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 165 transitions. Word has length 72 [2022-11-25 22:44:21,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:44:21,458 INFO L495 AbstractCegarLoop]: Abstraction has 149 states and 165 transitions. [2022-11-25 22:44:21,458 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.5853658536585367) internal successors, (65), 41 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) [2022-11-25 22:44:21,458 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 165 transitions. [2022-11-25 22:44:21,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-11-25 22:44:21,458 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:44:21,459 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:44:21,467 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-25 22:44:21,662 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-25 22:44:21,663 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:44:21,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:44:21,663 INFO L85 PathProgramCache]: Analyzing trace with hash 393114464, now seen corresponding path program 14 times [2022-11-25 22:44:21,663 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:44:21,663 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [532431216] [2022-11-25 22:44:21,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:44:21,663 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:44:21,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:44:40,194 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 10 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:44:40,194 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:44:40,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [532431216] [2022-11-25 22:44:40,194 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [532431216] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:44:40,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1342099831] [2022-11-25 22:44:40,195 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 22:44:40,195 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:44:40,195 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:44:40,197 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:44:40,198 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-25 22:44:40,377 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-25 22:44:40,378 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:44:40,383 WARN L261 TraceCheckSpWp]: Trace formula consists of 408 conjuncts, 263 conjunts are in the unsatisfiable core [2022-11-25 22:44:40,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:44:40,804 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 16 treesize of output 12 [2022-11-25 22:44:40,911 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 [2022-11-25 22:44:48,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:44:48,513 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:44:48,517 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:44:48,546 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 22:44:48,546 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 54 treesize of output 89 [2022-11-25 22:44:48,851 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 252 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:44:48,851 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:44:57,002 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-25 22:44:57,002 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1342099831] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:44:57,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1004681939] [2022-11-25 22:44:57,004 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 22:44:57,004 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:44:57,004 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:44:57,004 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:44:57,005 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:44:57,061 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 22:44:57,062 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-25 22:44:57,071 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-25 22:44:57,090 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 22:44:57,132 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:44:57,135 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:44:57,158 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 22:44:57,158 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 245 treesize of output 248 [2022-11-25 22:44:57,229 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 16 treesize of output 12 [2022-11-25 22:44:57,406 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:44:58,366 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11598#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 22:44:58,366 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:44:58,366 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:44:58,366 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 28, 20] total 106 [2022-11-25 22:44:58,366 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148715164] [2022-11-25 22:44:58,367 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:44:58,367 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2022-11-25 22:44:58,367 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:44:58,368 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2022-11-25 22:44:58,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=673, Invalid=11537, Unknown=0, NotChecked=0, Total=12210 [2022-11-25 22:44:58,369 INFO L87 Difference]: Start difference. First operand 149 states and 165 transitions. Second operand has 106 states, 106 states have (on average 2.0377358490566038) internal successors, (216), 106 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) [2022-11-25 22:45:27,339 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.20s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-25 22:45:30,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:45:30,011 INFO L93 Difference]: Finished difference Result 234 states and 250 transitions. [2022-11-25 22:45:30,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-11-25 22:45:30,011 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 106 states have (on average 2.0377358490566038) internal successors, (216), 106 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 76 [2022-11-25 22:45:30,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:45:30,012 INFO L225 Difference]: With dead ends: 234 [2022-11-25 22:45:30,012 INFO L226 Difference]: Without dead ends: 86 [2022-11-25 22:45:30,014 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 358 GetRequests, 148 SyntacticMatches, 44 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10119 ImplicationChecksByTransitivity, 40.9s TimeCoverageRelationStatistics Valid=2368, Invalid=25688, Unknown=0, NotChecked=0, Total=28056 [2022-11-25 22:45:30,015 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 155 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 6757 mSolverCounterSat, 1805 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 8563 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1805 IncrementalHoareTripleChecker+Valid, 6757 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.9s IncrementalHoareTripleChecker+Time [2022-11-25 22:45:30,015 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [155 Valid, 81 Invalid, 8563 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1805 Valid, 6757 Invalid, 1 Unknown, 0 Unchecked, 11.9s Time] [2022-11-25 22:45:30,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-11-25 22:45:30,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2022-11-25 22:45:30,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.1058823529411765) internal successors, (94), 85 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:45:30,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 94 transitions. [2022-11-25 22:45:30,074 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 94 transitions. Word has length 76 [2022-11-25 22:45:30,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:45:30,075 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 94 transitions. [2022-11-25 22:45:30,075 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 106 states, 106 states have (on average 2.0377358490566038) internal successors, (216), 106 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) [2022-11-25 22:45:30,075 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 94 transitions. [2022-11-25 22:45:30,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-11-25 22:45:30,076 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:45:30,076 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:45:30,088 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-11-25 22:45:30,282 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:45:30,282 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:45:30,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:45:30,283 INFO L85 PathProgramCache]: Analyzing trace with hash -651134475, now seen corresponding path program 15 times [2022-11-25 22:45:30,283 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:45:30,283 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1029453115] [2022-11-25 22:45:30,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:45:30,284 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:45:30,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:45:53,314 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 13 proven. 311 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:45:53,314 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:45:53,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1029453115] [2022-11-25 22:45:53,315 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1029453115] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:45:53,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1977288138] [2022-11-25 22:45:53,315 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 22:45:53,315 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:45:53,315 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:45:53,316 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:45:53,319 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-25 22:45:53,483 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 22:45:53,483 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:45:53,489 WARN L261 TraceCheckSpWp]: Trace formula consists of 455 conjuncts, 270 conjunts are in the unsatisfiable core [2022-11-25 22:45:53,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:45:53,616 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 [2022-11-25 22:45:59,235 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-25 22:45:59,235 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:46:03,163 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-25 22:46:03,163 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1977288138] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:46:03,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1391308838] [2022-11-25 22:46:03,166 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 22:46:03,166 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:46:03,166 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:46:03,166 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:46:03,166 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:46:03,222 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 22:46:03,222 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-25 22:46:03,233 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-25 22:46:03,250 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 22:46:03,300 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:46:03,301 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 22:46:03,323 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 22:46:03,323 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 245 treesize of output 248 [2022-11-25 22:46:03,398 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 16 treesize of output 12 [2022-11-25 22:46:03,568 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:46:13,255 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12955#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 22:46:13,255 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:46:13,255 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:46:13,255 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 22, 21] total 108 [2022-11-25 22:46:13,255 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2062967479] [2022-11-25 22:46:13,255 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:46:13,256 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 108 states [2022-11-25 22:46:13,256 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:46:13,257 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2022-11-25 22:46:13,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=568, Invalid=12088, Unknown=0, NotChecked=0, Total=12656 [2022-11-25 22:46:13,258 INFO L87 Difference]: Start difference. First operand 86 states and 94 transitions. Second operand has 108 states, 108 states have (on average 2.175925925925926) internal successors, (235), 108 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) [2022-11-25 22:46:51,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:46:51,890 INFO L93 Difference]: Finished difference Result 548 states and 656 transitions. [2022-11-25 22:46:51,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 129 states. [2022-11-25 22:46:51,890 INFO L78 Accepts]: Start accepts. Automaton has has 108 states, 108 states have (on average 2.175925925925926) internal successors, (235), 108 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 85 [2022-11-25 22:46:51,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:46:51,892 INFO L225 Difference]: With dead ends: 548 [2022-11-25 22:46:51,892 INFO L226 Difference]: Without dead ends: 406 [2022-11-25 22:46:51,895 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 446 GetRequests, 129 SyntacticMatches, 97 SemanticMatches, 220 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22568 ImplicationChecksByTransitivity, 54.7s TimeCoverageRelationStatistics Valid=3681, Invalid=45381, Unknown=0, NotChecked=0, Total=49062 [2022-11-25 22:46:51,896 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 156 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 6194 mSolverCounterSat, 2453 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 156 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 8647 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2453 IncrementalHoareTripleChecker+Valid, 6194 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.2s IncrementalHoareTripleChecker+Time [2022-11-25 22:46:51,896 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [156 Valid, 99 Invalid, 8647 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2453 Valid, 6194 Invalid, 0 Unknown, 0 Unchecked, 9.2s Time] [2022-11-25 22:46:51,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406 states. [2022-11-25 22:46:52,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406 to 279. [2022-11-25 22:46:52,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 279 states, 278 states have (on average 1.2374100719424461) internal successors, (344), 278 states have internal predecessors, (344), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:46:52,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 344 transitions. [2022-11-25 22:46:52,130 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 344 transitions. Word has length 85 [2022-11-25 22:46:52,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:46:52,131 INFO L495 AbstractCegarLoop]: Abstraction has 279 states and 344 transitions. [2022-11-25 22:46:52,131 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 108 states, 108 states have (on average 2.175925925925926) internal successors, (235), 108 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) [2022-11-25 22:46:52,131 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 344 transitions. [2022-11-25 22:46:52,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-11-25 22:46:52,132 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:46:52,132 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:46:52,139 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-25 22:46:52,338 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-25 22:46:52,339 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:46:52,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:46:52,339 INFO L85 PathProgramCache]: Analyzing trace with hash 459881435, now seen corresponding path program 16 times [2022-11-25 22:46:52,339 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:46:52,339 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1285733547] [2022-11-25 22:46:52,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:46:52,339 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:46:52,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:46:52,814 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 297 trivial. 0 not checked. [2022-11-25 22:46:52,814 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:46:52,814 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1285733547] [2022-11-25 22:46:52,814 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1285733547] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:46:52,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [931851577] [2022-11-25 22:46:52,815 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 22:46:52,815 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:46:52,815 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:46:52,819 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:46:52,842 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-25 22:46:52,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:46:52,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 487 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-25 22:46:52,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:46:53,190 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 297 trivial. 0 not checked. [2022-11-25 22:46:53,190 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:46:53,393 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 297 trivial. 0 not checked. [2022-11-25 22:46:53,393 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [931851577] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 22:46:53,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1763492735] [2022-11-25 22:46:53,395 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 22:46:53,395 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 22:46:53,395 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 22:46:53,395 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 22:46:53,396 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 22:46:53,450 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-25 22:46:53,451 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2022-11-25 22:46:53,461 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-25 22:46:53,478 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-25 22:46:53,526 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:46:53,528 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:46:53,539 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 22:46:53,540 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 250 treesize of output 247 [2022-11-25 22:46:53,580 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 16 treesize of output 12 [2022-11-25 22:46:53,745 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 22:46:55,320 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15379#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 22:46:55,320 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 22:46:55,320 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 22:46:55,321 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2022-11-25 22:46:55,321 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1174318584] [2022-11-25 22:46:55,321 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 22:46:55,321 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-25 22:46:55,321 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 22:46:55,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-25 22:46:55,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=1067, Unknown=0, NotChecked=0, Total=1332 [2022-11-25 22:46:55,323 INFO L87 Difference]: Start difference. First operand 279 states and 344 transitions. Second operand has 32 states, 32 states have (on average 1.59375) internal successors, (51), 32 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:46:56,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 22:46:56,250 INFO L93 Difference]: Finished difference Result 466 states and 585 transitions. [2022-11-25 22:46:56,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-25 22:46:56,250 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.59375) internal successors, (51), 32 states have internal predecessors, (51), 0 states have call successors, (0), 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 [2022-11-25 22:46:56,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 22:46:56,251 INFO L225 Difference]: With dead ends: 466 [2022-11-25 22:46:56,251 INFO L226 Difference]: Without dead ends: 258 [2022-11-25 22:46:56,252 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 172 SyntacticMatches, 85 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3584 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=438, Invalid=1818, Unknown=0, NotChecked=0, Total=2256 [2022-11-25 22:46:56,253 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 26 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 560 mSolverCounterSat, 425 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 985 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 425 IncrementalHoareTripleChecker+Valid, 560 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-25 22:46:56,253 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 7 Invalid, 985 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [425 Valid, 560 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-25 22:46:56,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2022-11-25 22:46:56,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 95. [2022-11-25 22:46:56,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 94 states have (on average 1.0957446808510638) internal successors, (103), 94 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:46:56,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 103 transitions. [2022-11-25 22:46:56,358 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 103 transitions. Word has length 91 [2022-11-25 22:46:56,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 22:46:56,358 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 103 transitions. [2022-11-25 22:46:56,358 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.59375) internal successors, (51), 32 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 22:46:56,358 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 103 transitions. [2022-11-25 22:46:56,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-11-25 22:46:56,359 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 22:46:56,359 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 22:46:56,364 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-25 22:46:56,561 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-25 22:46:56,561 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 22:46:56,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 22:46:56,562 INFO L85 PathProgramCache]: Analyzing trace with hash -1825812992, now seen corresponding path program 17 times [2022-11-25 22:46:56,562 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 22:46:56,562 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1308118858] [2022-11-25 22:46:56,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 22:46:56,562 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 22:46:56,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 22:47:27,528 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 36 proven. 369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 22:47:27,528 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 22:47:27,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1308118858] [2022-11-25 22:47:27,529 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1308118858] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 22:47:27,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1628245117] [2022-11-25 22:47:27,529 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 22:47:27,529 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 22:47:27,529 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 22:47:27,530 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 22:47:27,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca9eaaab-5e29-45ca-a08e-1d615f11a810/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-25 22:47:27,767 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-25 22:47:27,767 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 22:47:27,779 WARN L261 TraceCheckSpWp]: Trace formula consists of 502 conjuncts, 324 conjunts are in the unsatisfiable core [2022-11-25 22:47:27,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 22:47:27,927 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 16 treesize of output 12 [2022-11-25 22:47:27,934 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 16 treesize of output 12 [2022-11-25 22:47:27,939 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 16 treesize of output 12 [2022-11-25 22:47:27,951 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 [2022-11-25 22:47:47,545 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:47:47,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:47:47,550 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:47:47,551 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:47:47,553 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:47:47,561 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 22:47:47,615 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 22:47:47,615 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 18 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 72 treesize of output 145 [2022-11-25 22:47:48,098 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 9 proven. 360 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-25 22:47:48,099 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 22:48:18,721 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 330 treesize of output 314