./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/Mono4_1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version b5237d83 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/Mono4_1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 72ad066471387bf5403e859503e1fde5318d51a6c677887f8013c98efb036f7e --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-b5237d8 [2022-11-22 02:44:24,470 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-22 02:44:24,473 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-22 02:44:24,513 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-22 02:44:24,514 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-22 02:44:24,518 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-22 02:44:24,521 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-22 02:44:24,524 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-22 02:44:24,527 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-22 02:44:24,532 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-22 02:44:24,534 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-22 02:44:24,536 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-22 02:44:24,537 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-22 02:44:24,539 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-22 02:44:24,541 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-22 02:44:24,543 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-22 02:44:24,545 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-22 02:44:24,546 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-22 02:44:24,548 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-22 02:44:24,555 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-22 02:44:24,557 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-22 02:44:24,559 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-22 02:44:24,561 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-22 02:44:24,562 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-22 02:44:24,572 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-22 02:44:24,573 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-22 02:44:24,573 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-22 02:44:24,575 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-22 02:44:24,575 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-22 02:44:24,576 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-22 02:44:24,577 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-22 02:44:24,577 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-22 02:44:24,579 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-22 02:44:24,581 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-22 02:44:24,582 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-22 02:44:24,582 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-22 02:44:24,583 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-22 02:44:24,583 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-22 02:44:24,584 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-22 02:44:24,585 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-22 02:44:24,585 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-22 02:44:24,586 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-22 02:44:24,628 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-22 02:44:24,628 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-22 02:44:24,629 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-22 02:44:24,629 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-22 02:44:24,630 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-22 02:44:24,631 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-22 02:44:24,631 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-22 02:44:24,631 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-22 02:44:24,631 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-22 02:44:24,631 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-22 02:44:24,633 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-22 02:44:24,633 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-22 02:44:24,633 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-22 02:44:24,633 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-22 02:44:24,634 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-22 02:44:24,634 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-22 02:44:24,634 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-22 02:44:24,634 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-22 02:44:24,635 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-22 02:44:24,635 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-22 02:44:24,636 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-22 02:44:24,636 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-22 02:44:24,636 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-22 02:44:24,636 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-22 02:44:24,636 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-22 02:44:24,637 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-22 02:44:24,637 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-22 02:44:24,637 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-22 02:44:24,638 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-22 02:44:24,638 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-22 02:44:24,638 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-22 02:44:24,638 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-22 02:44:24,639 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 02:44:24,639 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-22 02:44:24,639 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-22 02:44:24,639 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-22 02:44:24,640 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-22 02:44:24,640 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-22 02:44:24,640 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-22 02:44:24,640 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-22 02:44:24,641 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-22 02:44:24,641 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_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 72ad066471387bf5403e859503e1fde5318d51a6c677887f8013c98efb036f7e [2022-11-22 02:44:24,943 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-22 02:44:24,972 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-22 02:44:24,974 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-22 02:44:24,976 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-22 02:44:24,976 INFO L275 PluginConnector]: CDTParser initialized [2022-11-22 02:44:24,977 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/../../sv-benchmarks/c/loops-crafted-1/Mono4_1.c [2022-11-22 02:44:27,890 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-22 02:44:28,112 INFO L351 CDTParser]: Found 1 translation units. [2022-11-22 02:44:28,113 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/sv-benchmarks/c/loops-crafted-1/Mono4_1.c [2022-11-22 02:44:28,121 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/data/a9b5d2b54/7d8e54f66a634786ad14393d53624c32/FLAG7e391a929 [2022-11-22 02:44:28,139 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/data/a9b5d2b54/7d8e54f66a634786ad14393d53624c32 [2022-11-22 02:44:28,142 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-22 02:44:28,144 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-22 02:44:28,148 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-22 02:44:28,148 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-22 02:44:28,152 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-22 02:44:28,153 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 02:44:28" (1/1) ... [2022-11-22 02:44:28,154 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5fab87b5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:44:28, skipping insertion in model container [2022-11-22 02:44:28,154 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 02:44:28" (1/1) ... [2022-11-22 02:44:28,162 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-22 02:44:28,179 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-22 02:44:28,310 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_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/sv-benchmarks/c/loops-crafted-1/Mono4_1.c[311,324] [2022-11-22 02:44:28,320 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 02:44:28,331 INFO L203 MainTranslator]: Completed pre-run [2022-11-22 02:44:28,340 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_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/sv-benchmarks/c/loops-crafted-1/Mono4_1.c[311,324] [2022-11-22 02:44:28,343 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 02:44:28,354 INFO L208 MainTranslator]: Completed translation [2022-11-22 02:44:28,355 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:44:28 WrapperNode [2022-11-22 02:44:28,355 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-22 02:44:28,356 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-22 02:44:28,356 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-22 02:44:28,356 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-22 02:44:28,363 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:44:28" (1/1) ... [2022-11-22 02:44:28,370 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:44:28" (1/1) ... [2022-11-22 02:44:28,388 INFO L138 Inliner]: procedures = 12, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 28 [2022-11-22 02:44:28,389 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-22 02:44:28,390 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-22 02:44:28,390 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-22 02:44:28,390 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-22 02:44:28,400 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:44:28" (1/1) ... [2022-11-22 02:44:28,400 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:44:28" (1/1) ... [2022-11-22 02:44:28,403 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:44:28" (1/1) ... [2022-11-22 02:44:28,404 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:44:28" (1/1) ... [2022-11-22 02:44:28,407 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:44:28" (1/1) ... [2022-11-22 02:44:28,412 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:44:28" (1/1) ... [2022-11-22 02:44:28,422 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:44:28" (1/1) ... [2022-11-22 02:44:28,423 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:44:28" (1/1) ... [2022-11-22 02:44:28,424 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-22 02:44:28,425 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-22 02:44:28,426 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-22 02:44:28,426 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-22 02:44:28,427 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:44:28" (1/1) ... [2022-11-22 02:44:28,433 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 02:44:28,449 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:44:28,473 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-22 02:44:28,498 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-22 02:44:28,519 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-22 02:44:28,519 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-22 02:44:28,520 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-22 02:44:28,520 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-22 02:44:28,590 INFO L235 CfgBuilder]: Building ICFG [2022-11-22 02:44:28,592 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-22 02:44:28,732 INFO L276 CfgBuilder]: Performing block encoding [2022-11-22 02:44:28,766 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-22 02:44:28,766 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-11-22 02:44:28,768 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 02:44:28 BoogieIcfgContainer [2022-11-22 02:44:28,768 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-22 02:44:28,787 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-22 02:44:28,787 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-22 02:44:28,790 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-22 02:44:28,790 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 02:44:28" (1/3) ... [2022-11-22 02:44:28,791 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@67c9440 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 02:44:28, skipping insertion in model container [2022-11-22 02:44:28,791 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:44:28" (2/3) ... [2022-11-22 02:44:28,791 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@67c9440 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 02:44:28, skipping insertion in model container [2022-11-22 02:44:28,792 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 02:44:28" (3/3) ... [2022-11-22 02:44:28,793 INFO L112 eAbstractionObserver]: Analyzing ICFG Mono4_1.c [2022-11-22 02:44:28,827 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-22 02:44:28,827 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-22 02:44:28,901 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-22 02:44:28,912 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;@27f67aa, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-22 02:44:28,913 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-22 02:44:28,917 INFO L276 IsEmpty]: Start isEmpty. Operand has 7 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:44:28,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-22 02:44:28,923 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:44:28,924 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-11-22 02:44:28,925 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:44:28,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:44:28,936 INFO L85 PathProgramCache]: Analyzing trace with hash 2034246, now seen corresponding path program 1 times [2022-11-22 02:44:28,946 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:44:28,946 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [667959262] [2022-11-22 02:44:28,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:44:28,948 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:44:29,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:44:29,142 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:44:29,142 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:44:29,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [667959262] [2022-11-22 02:44:29,143 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [667959262] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:44:29,144 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:44:29,144 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-22 02:44:29,146 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1408793675] [2022-11-22 02:44:29,147 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:44:29,151 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-22 02:44:29,151 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:44:29,179 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-22 02:44:29,180 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-22 02:44:29,182 INFO L87 Difference]: Start difference. First operand has 7 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 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 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:44:29,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:44:29,210 INFO L93 Difference]: Finished difference Result 13 states and 15 transitions. [2022-11-22 02:44:29,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-22 02:44:29,213 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 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 4 [2022-11-22 02:44:29,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:44:29,221 INFO L225 Difference]: With dead ends: 13 [2022-11-22 02:44:29,221 INFO L226 Difference]: Without dead ends: 6 [2022-11-22 02:44:29,224 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-22 02:44:29,227 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:44:29,228 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 6 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:44:29,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2022-11-22 02:44:29,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2022-11-22 02:44:29,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6 states, 5 states have (on average 1.2) internal successors, (6), 5 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:44:29,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2022-11-22 02:44:29,259 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 4 [2022-11-22 02:44:29,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:44:29,278 INFO L495 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2022-11-22 02:44:29,279 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:44:29,279 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2022-11-22 02:44:29,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-11-22 02:44:29,289 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:44:29,290 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-11-22 02:44:29,290 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-22 02:44:29,290 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:44:29,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:44:29,291 INFO L85 PathProgramCache]: Analyzing trace with hash 63135587, now seen corresponding path program 1 times [2022-11-22 02:44:29,292 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:44:29,292 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1982487883] [2022-11-22 02:44:29,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:44:29,292 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:44:29,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:44:29,427 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:44:29,428 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:44:29,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1982487883] [2022-11-22 02:44:29,428 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1982487883] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:44:29,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1855436684] [2022-11-22 02:44:29,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:44:29,429 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:44:29,430 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:44:29,438 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:44:29,444 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-22 02:44:29,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:44:29,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-22 02:44:29,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:44:29,555 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:44:29,556 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:44:29,700 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:44:29,701 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1855436684] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:44:29,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [777432364] [2022-11-22 02:44:29,721 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-11-22 02:44:29,721 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:44:29,725 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:44:29,731 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:44:29,731 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:44:29,987 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:44:30,141 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '69#(and (<= 1000000 |ULTIMATE.start_main_~x~0#1|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (not (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~y~0#1|)) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:44:30,141 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:44:30,142 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:44:30,142 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2022-11-22 02:44:30,143 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097780801] [2022-11-22 02:44:30,143 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:44:30,143 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-22 02:44:30,144 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:44:30,144 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-22 02:44:30,145 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2022-11-22 02:44:30,145 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:44:30,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:44:30,199 INFO L93 Difference]: Finished difference Result 12 states and 14 transitions. [2022-11-22 02:44:30,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-22 02:44:30,199 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-11-22 02:44:30,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:44:30,200 INFO L225 Difference]: With dead ends: 12 [2022-11-22 02:44:30,200 INFO L226 Difference]: Without dead ends: 9 [2022-11-22 02:44:30,201 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2022-11-22 02:44:30,202 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:44:30,203 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:44:30,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2022-11-22 02:44:30,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2022-11-22 02:44:30,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:44:30,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2022-11-22 02:44:30,206 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 5 [2022-11-22 02:44:30,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:44:30,206 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2022-11-22 02:44:30,206 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:44:30,207 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2022-11-22 02:44:30,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-22 02:44:30,207 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:44:30,207 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1] [2022-11-22 02:44:30,234 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-22 02:44:30,412 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:44:30,412 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:44:30,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:44:30,413 INFO L85 PathProgramCache]: Analyzing trace with hash -249960058, now seen corresponding path program 2 times [2022-11-22 02:44:30,413 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:44:30,413 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [665912575] [2022-11-22 02:44:30,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:44:30,414 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:44:30,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:44:30,736 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:44:30,737 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:44:30,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [665912575] [2022-11-22 02:44:30,740 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [665912575] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:44:30,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1152012409] [2022-11-22 02:44:30,741 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:44:30,741 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:44:30,741 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:44:30,743 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:44:30,766 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-22 02:44:30,805 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-22 02:44:30,805 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:44:30,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-22 02:44:30,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:44:30,886 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:44:30,886 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:44:31,048 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:44:31,049 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1152012409] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:44:31,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [963044545] [2022-11-22 02:44:31,051 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-11-22 02:44:31,052 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:44:31,052 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:44:31,052 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:44:31,053 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:44:31,245 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:44:31,443 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '163#(and (<= 1000000 |ULTIMATE.start_main_~x~0#1|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (not (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~y~0#1|)) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:44:31,443 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:44:31,443 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:44:31,443 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 17 [2022-11-22 02:44:31,444 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1677797719] [2022-11-22 02:44:31,444 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:44:31,444 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-22 02:44:31,444 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:44:31,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-22 02:44:31,446 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=289, Unknown=0, NotChecked=0, Total=420 [2022-11-22 02:44:31,446 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand has 18 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 17 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:44:31,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:44:31,523 INFO L93 Difference]: Finished difference Result 18 states and 23 transitions. [2022-11-22 02:44:31,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-22 02:44:31,524 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 17 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-22 02:44:31,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:44:31,524 INFO L225 Difference]: With dead ends: 18 [2022-11-22 02:44:31,524 INFO L226 Difference]: Without dead ends: 15 [2022-11-22 02:44:31,525 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=157, Invalid=349, Unknown=0, NotChecked=0, Total=506 [2022-11-22 02:44:31,526 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:44:31,526 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 13 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:44:31,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-11-22 02:44:31,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-11-22 02:44:31,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 14 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:44:31,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2022-11-22 02:44:31,530 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 8 [2022-11-22 02:44:31,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:44:31,530 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2022-11-22 02:44:31,531 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 17 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:44:31,531 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2022-11-22 02:44:31,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-22 02:44:31,531 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:44:31,532 INFO L195 NwaCegarLoop]: trace histogram [10, 1, 1, 1, 1] [2022-11-22 02:44:31,539 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-11-22 02:44:31,732 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:44:31,733 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:44:31,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:44:31,733 INFO L85 PathProgramCache]: Analyzing trace with hash -1492112282, now seen corresponding path program 3 times [2022-11-22 02:44:31,733 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:44:31,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [992546247] [2022-11-22 02:44:31,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:44:31,734 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:44:31,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:44:32,264 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:44:32,264 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:44:32,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [992546247] [2022-11-22 02:44:32,264 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [992546247] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:44:32,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2036220111] [2022-11-22 02:44:32,265 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:44:32,265 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:44:32,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:44:32,267 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:44:32,299 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-22 02:44:32,321 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:44:32,321 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:44:32,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-22 02:44:32,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:44:32,592 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:44:32,593 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:44:33,091 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:44:33,092 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2036220111] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:44:33,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [433241267] [2022-11-22 02:44:33,094 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-11-22 02:44:33,094 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:44:33,094 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:44:33,095 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:44:33,095 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:44:33,212 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:44:33,395 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '339#(and (<= 1000000 |ULTIMATE.start_main_~x~0#1|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (not (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~y~0#1|)) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:44:33,395 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:44:33,395 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:44:33,395 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 35 [2022-11-22 02:44:33,396 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636155605] [2022-11-22 02:44:33,396 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:44:33,396 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-22 02:44:33,396 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:44:33,397 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-22 02:44:33,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=539, Invalid=943, Unknown=0, NotChecked=0, Total=1482 [2022-11-22 02:44:33,398 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand has 36 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 35 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:44:33,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:44:33,493 INFO L93 Difference]: Finished difference Result 30 states and 41 transitions. [2022-11-22 02:44:33,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-22 02:44:33,494 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 35 states have internal predecessors, (39), 0 states have call successors, (0), 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 [2022-11-22 02:44:33,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:44:33,494 INFO L225 Difference]: With dead ends: 30 [2022-11-22 02:44:33,495 INFO L226 Difference]: Without dead ends: 27 [2022-11-22 02:44:33,495 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=589, Invalid=1051, Unknown=0, NotChecked=0, Total=1640 [2022-11-22 02:44:33,496 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:44:33,497 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 17 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:44:33,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-11-22 02:44:33,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-11-22 02:44:33,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 26 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) [2022-11-22 02:44:33,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2022-11-22 02:44:33,502 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 14 [2022-11-22 02:44:33,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:44:33,502 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2022-11-22 02:44:33,503 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 35 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:44:33,503 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2022-11-22 02:44:33,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-22 02:44:33,504 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:44:33,504 INFO L195 NwaCegarLoop]: trace histogram [22, 1, 1, 1, 1] [2022-11-22 02:44:33,509 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-11-22 02:44:33,708 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:44:33,709 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:44:33,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:44:33,709 INFO L85 PathProgramCache]: Analyzing trace with hash 545896998, now seen corresponding path program 4 times [2022-11-22 02:44:33,709 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:44:33,710 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2124157238] [2022-11-22 02:44:33,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:44:33,710 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:44:33,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:44:35,168 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:44:35,168 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:44:35,168 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2124157238] [2022-11-22 02:44:35,168 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2124157238] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:44:35,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [725498837] [2022-11-22 02:44:35,169 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:44:35,169 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:44:35,169 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:44:35,171 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:44:35,179 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-22 02:44:35,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:44:35,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-22 02:44:35,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:44:36,051 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:44:36,052 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:44:37,727 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:44:37,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [725498837] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:44:37,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1272267905] [2022-11-22 02:44:37,730 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-11-22 02:44:37,730 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:44:37,730 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:44:37,730 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:44:37,731 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:44:37,903 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:44:38,129 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '671#(and (<= 1000000 |ULTIMATE.start_main_~x~0#1|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (not (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~y~0#1|)) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:44:38,129 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:44:38,129 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:44:38,129 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 71 [2022-11-22 02:44:38,129 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474255555] [2022-11-22 02:44:38,129 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:44:38,130 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2022-11-22 02:44:38,130 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:44:38,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2022-11-22 02:44:38,133 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2219, Invalid=3331, Unknown=0, NotChecked=0, Total=5550 [2022-11-22 02:44:38,133 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand has 72 states, 72 states have (on average 1.0416666666666667) internal successors, (75), 71 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:44:38,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:44:38,320 INFO L93 Difference]: Finished difference Result 54 states and 77 transitions. [2022-11-22 02:44:38,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-11-22 02:44:38,322 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 1.0416666666666667) internal successors, (75), 71 states have internal predecessors, (75), 0 states have call successors, (0), 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 26 [2022-11-22 02:44:38,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:44:38,325 INFO L225 Difference]: With dead ends: 54 [2022-11-22 02:44:38,325 INFO L226 Difference]: Without dead ends: 51 [2022-11-22 02:44:38,327 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 526 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=2317, Invalid=3535, Unknown=0, NotChecked=0, Total=5852 [2022-11-22 02:44:38,329 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:44:38,330 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 11 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:44:38,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-11-22 02:44:38,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2022-11-22 02:44:38,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.02) internal successors, (51), 50 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) [2022-11-22 02:44:38,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2022-11-22 02:44:38,347 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 26 [2022-11-22 02:44:38,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:44:38,348 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2022-11-22 02:44:38,348 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 72 states have (on average 1.0416666666666667) internal successors, (75), 71 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:44:38,348 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2022-11-22 02:44:38,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-22 02:44:38,350 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:44:38,350 INFO L195 NwaCegarLoop]: trace histogram [46, 1, 1, 1, 1] [2022-11-22 02:44:38,361 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-22 02:44:38,556 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:44:38,556 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:44:38,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:44:38,557 INFO L85 PathProgramCache]: Analyzing trace with hash -696715866, now seen corresponding path program 5 times [2022-11-22 02:44:38,557 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:44:38,557 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [499686850] [2022-11-22 02:44:38,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:44:38,557 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:44:38,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:44:42,670 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:44:42,671 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:44:42,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [499686850] [2022-11-22 02:44:42,671 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [499686850] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:44:42,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1063405996] [2022-11-22 02:44:42,671 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:44:42,671 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:44:42,672 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:44:42,678 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:44:42,698 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-22 02:44:42,784 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2022-11-22 02:44:42,784 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:44:42,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-22 02:44:42,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:44:45,441 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:44:45,442 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:44:50,699 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:44:50,699 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1063405996] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:44:50,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [369729401] [2022-11-22 02:44:50,702 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-11-22 02:44:50,702 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:44:50,702 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:44:50,702 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:44:50,703 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:44:50,837 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:44:51,167 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1315#(and (<= 1000000 |ULTIMATE.start_main_~x~0#1|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (not (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~y~0#1|)) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:44:51,167 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:44:51,167 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:44:51,167 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48, 48] total 143 [2022-11-22 02:44:51,168 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1368240924] [2022-11-22 02:44:51,168 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:44:51,169 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 144 states [2022-11-22 02:44:51,169 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:44:51,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 144 interpolants. [2022-11-22 02:44:51,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9035, Invalid=12427, Unknown=0, NotChecked=0, Total=21462 [2022-11-22 02:44:51,178 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand has 144 states, 144 states have (on average 1.0208333333333333) internal successors, (147), 143 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:44:51,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:44:51,596 INFO L93 Difference]: Finished difference Result 102 states and 149 transitions. [2022-11-22 02:44:51,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2022-11-22 02:44:51,597 INFO L78 Accepts]: Start accepts. Automaton has has 144 states, 144 states have (on average 1.0208333333333333) internal successors, (147), 143 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2022-11-22 02:44:51,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:44:51,602 INFO L225 Difference]: With dead ends: 102 [2022-11-22 02:44:51,602 INFO L226 Difference]: Without dead ends: 99 [2022-11-22 02:44:51,609 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1642 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=9229, Invalid=12823, Unknown=0, NotChecked=0, Total=22052 [2022-11-22 02:44:51,611 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 133 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 133 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:44:51,611 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 13 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 133 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:44:51,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-11-22 02:44:51,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2022-11-22 02:44:51,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 98 states have (on average 1.010204081632653) internal successors, (99), 98 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:44:51,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2022-11-22 02:44:51,633 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 50 [2022-11-22 02:44:51,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:44:51,633 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2022-11-22 02:44:51,634 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 144 states, 144 states have (on average 1.0208333333333333) internal successors, (147), 143 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:44:51,634 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2022-11-22 02:44:51,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-11-22 02:44:51,638 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:44:51,638 INFO L195 NwaCegarLoop]: trace histogram [94, 1, 1, 1, 1] [2022-11-22 02:44:51,648 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-22 02:44:51,848 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:44:51,848 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:44:51,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:44:51,849 INFO L85 PathProgramCache]: Analyzing trace with hash -1601704794, now seen corresponding path program 6 times [2022-11-22 02:44:51,849 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:44:51,849 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [721145922] [2022-11-22 02:44:51,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:44:51,849 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:44:51,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:45:05,778 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:45:05,779 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:45:05,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [721145922] [2022-11-22 02:45:05,779 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [721145922] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:45:05,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1863644821] [2022-11-22 02:45:05,779 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:45:05,780 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:45:05,780 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:45:05,781 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:45:05,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-22 02:45:05,887 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:45:05,888 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:45:05,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 96 conjunts are in the unsatisfiable core [2022-11-22 02:45:05,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:45:15,479 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:45:15,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:45:35,322 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:45:35,323 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1863644821] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:45:35,323 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2004511693] [2022-11-22 02:45:35,324 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-11-22 02:45:35,324 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:45:35,324 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:45:35,324 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:45:35,324 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:45:35,440 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:45:35,975 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2583#(and (<= 1000000 |ULTIMATE.start_main_~x~0#1|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (not (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~y~0#1|)) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:45:35,975 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:45:35,976 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:45:35,976 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 96, 96] total 287 [2022-11-22 02:45:35,976 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79218365] [2022-11-22 02:45:35,976 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:45:35,977 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 288 states [2022-11-22 02:45:35,977 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:45:35,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 288 interpolants. [2022-11-22 02:45:35,993 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36491, Invalid=47899, Unknown=0, NotChecked=0, Total=84390 [2022-11-22 02:45:35,994 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand has 288 states, 288 states have (on average 1.0104166666666667) internal successors, (291), 287 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:45:37,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:45:37,236 INFO L93 Difference]: Finished difference Result 198 states and 293 transitions. [2022-11-22 02:45:37,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 192 states. [2022-11-22 02:45:37,237 INFO L78 Accepts]: Start accepts. Automaton has has 288 states, 288 states have (on average 1.0104166666666667) internal successors, (291), 287 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 98 [2022-11-22 02:45:37,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:45:37,243 INFO L225 Difference]: With dead ends: 198 [2022-11-22 02:45:37,244 INFO L226 Difference]: Without dead ends: 195 [2022-11-22 02:45:37,250 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 291 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5602 ImplicationChecksByTransitivity, 32.8s TimeCoverageRelationStatistics Valid=36877, Invalid=48679, Unknown=0, NotChecked=0, Total=85556 [2022-11-22 02:45:37,251 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 256 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 360 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 256 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:45:37,252 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 21 Invalid, 360 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 256 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:45:37,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2022-11-22 02:45:37,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 195. [2022-11-22 02:45:37,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 194 states have (on average 1.0051546391752577) internal successors, (195), 194 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:45:37,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 195 transitions. [2022-11-22 02:45:37,283 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 195 transitions. Word has length 98 [2022-11-22 02:45:37,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:45:37,284 INFO L495 AbstractCegarLoop]: Abstraction has 195 states and 195 transitions. [2022-11-22 02:45:37,287 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 288 states, 288 states have (on average 1.0104166666666667) internal successors, (291), 287 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:45:37,287 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 195 transitions. [2022-11-22 02:45:37,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2022-11-22 02:45:37,292 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:45:37,292 INFO L195 NwaCegarLoop]: trace histogram [190, 1, 1, 1, 1] [2022-11-22 02:45:37,298 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-22 02:45:37,494 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-22 02:45:37,495 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:45:37,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:45:37,495 INFO L85 PathProgramCache]: Analyzing trace with hash -9971034, now seen corresponding path program 7 times [2022-11-22 02:45:37,495 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:45:37,495 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1341182266] [2022-11-22 02:45:37,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:45:37,496 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:45:37,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:46:28,871 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:46:28,872 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:46:28,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1341182266] [2022-11-22 02:46:28,872 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1341182266] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:46:28,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [361568932] [2022-11-22 02:46:28,872 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:46:28,873 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:46:28,873 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:46:28,875 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:46:28,882 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-22 02:46:29,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:46:29,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 192 conjunts are in the unsatisfiable core [2022-11-22 02:46:29,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:47:08,180 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:47:08,180 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:48:27,280 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:48:27,280 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [361568932] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:48:27,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1205399733] [2022-11-22 02:48:27,282 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-11-22 02:48:27,283 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:48:27,283 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:48:27,283 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:48:27,283 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:48:27,421 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:48:28,467 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5099#(and (<= 1000000 |ULTIMATE.start_main_~x~0#1|) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (not (= |ULTIMATE.start_main_~x~0#1| |ULTIMATE.start_main_~y~0#1|)) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:48:28,467 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:48:28,467 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:48:28,468 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [193, 192, 192] total 575 [2022-11-22 02:48:28,468 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547360197] [2022-11-22 02:48:28,468 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:48:28,469 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 576 states [2022-11-22 02:48:28,469 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:48:28,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 576 interpolants. [2022-11-22 02:48:28,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146699, Invalid=187963, Unknown=0, NotChecked=0, Total=334662 [2022-11-22 02:48:28,532 INFO L87 Difference]: Start difference. First operand 195 states and 195 transitions. Second operand has 576 states, 576 states have (on average 1.0052083333333333) internal successors, (579), 575 states have internal predecessors, (579), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:48:32,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:48:32,754 INFO L93 Difference]: Finished difference Result 390 states and 581 transitions. [2022-11-22 02:48:32,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 384 states. [2022-11-22 02:48:32,756 INFO L78 Accepts]: Start accepts. Automaton has has 576 states, 576 states have (on average 1.0052083333333333) internal successors, (579), 575 states have internal predecessors, (579), 0 states have call successors, (0), 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 194 [2022-11-22 02:48:32,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:48:32,758 INFO L225 Difference]: With dead ends: 390 [2022-11-22 02:48:32,759 INFO L226 Difference]: Without dead ends: 387 [2022-11-22 02:48:32,774 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 775 GetRequests, 196 SyntacticMatches, 0 SemanticMatches, 579 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20434 ImplicationChecksByTransitivity, 133.2s TimeCoverageRelationStatistics Valid=147469, Invalid=189511, Unknown=0, NotChecked=0, Total=336980 [2022-11-22 02:48:32,775 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 499 mSolverCounterSat, 199 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 698 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 199 IncrementalHoareTripleChecker+Valid, 499 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-22 02:48:32,776 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 17 Invalid, 698 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [199 Valid, 499 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-22 02:48:32,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2022-11-22 02:48:32,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 387. [2022-11-22 02:48:32,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 387 states, 386 states have (on average 1.0025906735751295) internal successors, (387), 386 states have internal predecessors, (387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:48:32,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 387 states to 387 states and 387 transitions. [2022-11-22 02:48:32,808 INFO L78 Accepts]: Start accepts. Automaton has 387 states and 387 transitions. Word has length 194 [2022-11-22 02:48:32,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:48:32,809 INFO L495 AbstractCegarLoop]: Abstraction has 387 states and 387 transitions. [2022-11-22 02:48:32,810 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 576 states, 576 states have (on average 1.0052083333333333) internal successors, (579), 575 states have internal predecessors, (579), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:48:32,810 INFO L276 IsEmpty]: Start isEmpty. Operand 387 states and 387 transitions. [2022-11-22 02:48:32,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 387 [2022-11-22 02:48:32,817 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:48:32,817 INFO L195 NwaCegarLoop]: trace histogram [382, 1, 1, 1, 1] [2022-11-22 02:48:32,826 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-22 02:48:33,024 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:48:33,024 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:48:33,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:48:33,025 INFO L85 PathProgramCache]: Analyzing trace with hash 2016392870, now seen corresponding path program 8 times [2022-11-22 02:48:33,025 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:48:33,025 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [730189097] [2022-11-22 02:48:33,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:48:33,025 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:48:33,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:53:36,640 INFO L134 CoverageAnalysis]: Checked inductivity of 73153 backedges. 0 proven. 73153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:53:36,641 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:53:36,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [730189097] [2022-11-22 02:53:36,641 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [730189097] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:53:36,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [762066970] [2022-11-22 02:53:36,642 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:53:36,642 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:53:36,642 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:53:36,650 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:53:36,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7fb19b0e-5a5d-4b66-a6bf-d908e8e297ae/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-22 02:53:38,872 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 192 check-sat command(s) [2022-11-22 02:53:38,872 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:53:38,885 INFO L263 TraceCheckSpWp]: Trace formula consists of 801 conjuncts, 384 conjunts are in the unsatisfiable core [2022-11-22 02:53:38,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:56:15,007 INFO L134 CoverageAnalysis]: Checked inductivity of 73153 backedges. 0 proven. 73153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:56:15,007 INFO L328 TraceCheckSpWp]: Computing backward predicates...