./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/nested_delay_notd2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5e519f3a 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_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/nested_delay_notd2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI --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 a8791b6973aa1a0d5421161a634fa2e6c3276aa5fd05ed6d81de7a2762aa206a --- 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-5e519f3 [2022-11-03 01:35:59,523 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 01:35:59,525 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 01:35:59,553 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 01:35:59,553 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 01:35:59,555 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 01:35:59,556 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 01:35:59,558 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 01:35:59,560 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 01:35:59,561 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 01:35:59,562 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 01:35:59,564 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 01:35:59,564 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 01:35:59,566 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 01:35:59,567 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 01:35:59,568 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 01:35:59,569 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 01:35:59,571 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 01:35:59,572 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 01:35:59,574 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 01:35:59,576 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 01:35:59,578 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 01:35:59,579 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 01:35:59,580 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 01:35:59,584 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 01:35:59,585 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 01:35:59,585 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 01:35:59,586 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 01:35:59,587 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 01:35:59,588 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 01:35:59,589 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 01:35:59,590 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 01:35:59,591 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 01:35:59,592 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 01:35:59,593 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 01:35:59,593 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 01:35:59,594 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 01:35:59,595 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 01:35:59,595 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 01:35:59,596 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 01:35:59,597 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 01:35:59,599 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-03 01:35:59,641 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 01:35:59,641 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 01:35:59,642 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 01:35:59,642 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 01:35:59,643 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 01:35:59,643 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 01:35:59,643 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 01:35:59,644 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 01:35:59,644 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 01:35:59,644 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-03 01:35:59,645 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 01:35:59,645 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 01:35:59,646 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-03 01:35:59,646 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-03 01:35:59,646 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 01:35:59,646 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-03 01:35:59,646 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-03 01:35:59,647 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-03 01:35:59,647 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 01:35:59,647 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-03 01:35:59,648 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-03 01:35:59,648 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-03 01:35:59,648 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 01:35:59,648 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-03 01:35:59,648 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 01:35:59,649 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-03 01:35:59,649 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-03 01:35:59,649 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-03 01:35:59,649 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 01:35:59,649 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-03 01:35:59,650 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 01:35:59,650 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 01:35:59,650 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 01:35:59,650 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 01:35:59,651 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-03 01:35:59,651 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 01:35:59,651 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-03 01:35:59,651 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-03 01:35:59,651 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-03 01:35:59,653 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-03 01:35:59,653 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 01:35:59,653 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_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a8791b6973aa1a0d5421161a634fa2e6c3276aa5fd05ed6d81de7a2762aa206a [2022-11-03 01:35:59,981 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 01:36:00,003 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 01:36:00,006 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 01:36:00,020 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 01:36:00,021 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 01:36:00,022 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/loops-crafted-1/nested_delay_notd2.c [2022-11-03 01:36:00,098 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/data/53081c882/9b732950aa664468bb8d753701556efa/FLAGdb4da1eed [2022-11-03 01:36:00,652 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 01:36:00,654 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/sv-benchmarks/c/loops-crafted-1/nested_delay_notd2.c [2022-11-03 01:36:00,663 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/data/53081c882/9b732950aa664468bb8d753701556efa/FLAGdb4da1eed [2022-11-03 01:36:01,108 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/data/53081c882/9b732950aa664468bb8d753701556efa [2022-11-03 01:36:01,111 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 01:36:01,112 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 01:36:01,114 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 01:36:01,114 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 01:36:01,118 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 01:36:01,119 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 01:36:01" (1/1) ... [2022-11-03 01:36:01,121 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@162b785 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:36:01, skipping insertion in model container [2022-11-03 01:36:01,121 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 01:36:01" (1/1) ... [2022-11-03 01:36:01,129 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 01:36:01,145 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 01:36:01,364 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/sv-benchmarks/c/loops-crafted-1/nested_delay_notd2.c[468,481] [2022-11-03 01:36:01,385 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 01:36:01,394 INFO L203 MainTranslator]: Completed pre-run [2022-11-03 01:36:01,409 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/sv-benchmarks/c/loops-crafted-1/nested_delay_notd2.c[468,481] [2022-11-03 01:36:01,430 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 01:36:01,447 INFO L208 MainTranslator]: Completed translation [2022-11-03 01:36:01,447 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:36:01 WrapperNode [2022-11-03 01:36:01,448 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 01:36:01,449 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-03 01:36:01,449 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-03 01:36:01,449 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-03 01:36:01,456 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:36:01" (1/1) ... [2022-11-03 01:36:01,466 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:36:01" (1/1) ... [2022-11-03 01:36:01,494 INFO L138 Inliner]: procedures = 14, calls = 9, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 62 [2022-11-03 01:36:01,495 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-03 01:36:01,496 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-03 01:36:01,496 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-03 01:36:01,497 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-03 01:36:01,506 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:36:01" (1/1) ... [2022-11-03 01:36:01,507 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:36:01" (1/1) ... [2022-11-03 01:36:01,522 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:36:01" (1/1) ... [2022-11-03 01:36:01,522 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:36:01" (1/1) ... [2022-11-03 01:36:01,525 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:36:01" (1/1) ... [2022-11-03 01:36:01,536 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:36:01" (1/1) ... [2022-11-03 01:36:01,537 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:36:01" (1/1) ... [2022-11-03 01:36:01,539 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:36:01" (1/1) ... [2022-11-03 01:36:01,541 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-03 01:36:01,548 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-03 01:36:01,548 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-03 01:36:01,548 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-03 01:36:01,549 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:36:01" (1/1) ... [2022-11-03 01:36:01,556 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 01:36:01,567 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:36:01,586 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-03 01:36:01,614 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-03 01:36:01,634 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-03 01:36:01,634 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-03 01:36:01,635 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-03 01:36:01,635 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-03 01:36:01,698 INFO L235 CfgBuilder]: Building ICFG [2022-11-03 01:36:01,700 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-03 01:36:01,959 INFO L276 CfgBuilder]: Performing block encoding [2022-11-03 01:36:02,150 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-03 01:36:02,150 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-03 01:36:02,153 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 01:36:02 BoogieIcfgContainer [2022-11-03 01:36:02,153 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-03 01:36:02,156 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-03 01:36:02,156 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-03 01:36:02,160 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-03 01:36:02,160 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 01:36:01" (1/3) ... [2022-11-03 01:36:02,161 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@247114 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 01:36:02, skipping insertion in model container [2022-11-03 01:36:02,161 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 01:36:01" (2/3) ... [2022-11-03 01:36:02,162 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@247114 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 01:36:02, skipping insertion in model container [2022-11-03 01:36:02,162 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 01:36:02" (3/3) ... [2022-11-03 01:36:02,163 INFO L112 eAbstractionObserver]: Analyzing ICFG nested_delay_notd2.c [2022-11-03 01:36:02,190 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-03 01:36:02,190 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-03 01:36:02,263 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-03 01:36:02,282 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;@5a59fd05, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-03 01:36:02,282 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-03 01:36:02,287 INFO L276 IsEmpty]: Start isEmpty. Operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 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) [2022-11-03 01:36:02,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-11-03 01:36:02,294 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:36:02,294 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-11-03 01:36:02,295 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:36:02,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:36:02,301 INFO L85 PathProgramCache]: Analyzing trace with hash 110532394, now seen corresponding path program 1 times [2022-11-03 01:36:02,311 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:36:02,312 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [760372804] [2022-11-03 01:36:02,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:36:02,313 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:36:02,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:36:02,727 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:36:02,728 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:36:02,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [760372804] [2022-11-03 01:36:02,729 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [760372804] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:36:02,729 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 01:36:02,730 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 01:36:02,731 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802006676] [2022-11-03 01:36:02,735 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:36:02,739 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 01:36:02,740 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:36:02,777 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 01:36:02,779 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-03 01:36:02,781 INFO L87 Difference]: Start difference. First operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 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) Second operand has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:36:02,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:36:02,823 INFO L93 Difference]: Finished difference Result 16 states and 23 transitions. [2022-11-03 01:36:02,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 01:36:02,826 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 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 [2022-11-03 01:36:02,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:36:02,834 INFO L225 Difference]: With dead ends: 16 [2022-11-03 01:36:02,834 INFO L226 Difference]: Without dead ends: 9 [2022-11-03 01:36:02,841 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-03 01:36:02,846 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 8 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 01:36:02,847 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 9 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 01:36:02,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2022-11-03 01:36:02,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 8. [2022-11-03 01:36:02,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 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) [2022-11-03 01:36:02,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2022-11-03 01:36:02,885 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 5 [2022-11-03 01:36:02,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:36:02,885 INFO L495 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2022-11-03 01:36:02,886 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:36:02,887 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2022-11-03 01:36:02,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-03 01:36:02,889 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:36:02,890 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-03 01:36:02,890 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-03 01:36:02,891 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:36:02,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:36:02,893 INFO L85 PathProgramCache]: Analyzing trace with hash -868517856, now seen corresponding path program 1 times [2022-11-03 01:36:02,893 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:36:02,894 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1930902584] [2022-11-03 01:36:02,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:36:02,894 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:36:02,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:36:03,026 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:36:03,026 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:36:03,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1930902584] [2022-11-03 01:36:03,027 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1930902584] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:36:03,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1963932275] [2022-11-03 01:36:03,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:36:03,028 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:36:03,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:36:03,030 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:36:03,046 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-03 01:36:03,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:36:03,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-03 01:36:03,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:36:03,227 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:36:03,228 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 01:36:03,278 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:36:03,284 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1963932275] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 01:36:03,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [730317981] [2022-11-03 01:36:03,313 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-03 01:36:03,313 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 01:36:03,317 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 01:36:03,324 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 01:36:03,324 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 01:36:04,440 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 01:36:05,577 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '91#(and (<= |ULTIMATE.start_main_~st~0#1| 1) (or (and (= 3 |ULTIMATE.start_main_~b~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1))) (and (or (and (= ~last~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|)) (and (or (and (= |ULTIMATE.start_main_~d~0#1| 0) (or (not (<= ~SIZE~0 ~last~0)) (not (= |ULTIMATE.start_main_~st~0#1| 1)))) (and (= |ULTIMATE.start_main_~d~0#1| 1) (<= ~SIZE~0 ~last~0) (= |ULTIMATE.start_main_~st~0#1| 1))) (= 2 |ULTIMATE.start_main_~a~0#1|) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= ~last~0 |ULTIMATE.start_main_~c~0#1|))))) (= 2 |ULTIMATE.start_main_~b~0#1|) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1)))))) (not (< |ULTIMATE.start_main_~c~0#1| ~SIZE~0)) (<= ~SIZE~0 20) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 20 ~SIZE~0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 (+ ~last~0 2147483648)) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (and (= ~SIZE~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~a~0#1| |ULTIMATE.start_main_~b~0#1|)) 1 0)) (<= ~last~0 2147483647) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-11-03 01:36:05,578 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 01:36:05,578 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 01:36:05,578 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 9 [2022-11-03 01:36:05,579 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [470154868] [2022-11-03 01:36:05,579 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 01:36:05,580 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-03 01:36:05,580 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:36:05,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-03 01:36:05,582 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=119, Unknown=0, NotChecked=0, Total=182 [2022-11-03 01:36:05,582 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand has 10 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:36:05,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:36:05,669 INFO L93 Difference]: Finished difference Result 19 states and 24 transitions. [2022-11-03 01:36:05,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-03 01:36:05,671 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-03 01:36:05,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:36:05,671 INFO L225 Difference]: With dead ends: 19 [2022-11-03 01:36:05,672 INFO L226 Difference]: Without dead ends: 12 [2022-11-03 01:36:05,674 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=83, Invalid=157, Unknown=0, NotChecked=0, Total=240 [2022-11-03 01:36:05,676 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 16 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 01:36:05,679 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 13 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 01:36:05,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2022-11-03 01:36:05,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 11. [2022-11-03 01:36:05,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:36:05,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2022-11-03 01:36:05,687 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 6 [2022-11-03 01:36:05,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:36:05,688 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2022-11-03 01:36:05,688 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:36:05,688 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2022-11-03 01:36:05,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-03 01:36:05,689 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:36:05,690 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1] [2022-11-03 01:36:05,736 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-03 01:36:05,903 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:36:05,903 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:36:05,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:36:05,904 INFO L85 PathProgramCache]: Analyzing trace with hash -1186847574, now seen corresponding path program 2 times [2022-11-03 01:36:05,904 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:36:05,904 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1576955620] [2022-11-03 01:36:05,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:36:05,904 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:36:05,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:36:06,100 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:36:06,101 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:36:06,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1576955620] [2022-11-03 01:36:06,101 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1576955620] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:36:06,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [378089013] [2022-11-03 01:36:06,102 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 01:36:06,102 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:36:06,102 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:36:06,103 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:36:06,122 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-03 01:36:06,172 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-03 01:36:06,172 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 01:36:06,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-03 01:36:06,176 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:36:06,284 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:36:06,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 01:36:06,374 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:36:06,374 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [378089013] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 01:36:06,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [207201808] [2022-11-03 01:36:06,382 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-03 01:36:06,382 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 01:36:06,383 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 01:36:06,383 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 01:36:06,383 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 01:36:06,699 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 01:36:07,363 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '215#(and (<= |ULTIMATE.start_main_~st~0#1| 1) (or (and (= 3 |ULTIMATE.start_main_~b~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1))) (and (or (and (= ~last~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|)) (and (or (and (= |ULTIMATE.start_main_~d~0#1| 0) (or (not (<= ~SIZE~0 ~last~0)) (not (= |ULTIMATE.start_main_~st~0#1| 1)))) (and (= |ULTIMATE.start_main_~d~0#1| 1) (<= ~SIZE~0 ~last~0) (= |ULTIMATE.start_main_~st~0#1| 1))) (= 2 |ULTIMATE.start_main_~a~0#1|) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= ~last~0 |ULTIMATE.start_main_~c~0#1|))))) (= 2 |ULTIMATE.start_main_~b~0#1|) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1)))))) (not (< |ULTIMATE.start_main_~c~0#1| ~SIZE~0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 (+ ~last~0 2147483648)) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (= ~SIZE~0 20) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~st~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (and (= ~SIZE~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~a~0#1| |ULTIMATE.start_main_~b~0#1|)) 1 0)) (<= ~last~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-11-03 01:36:07,363 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 01:36:07,364 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 01:36:07,364 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 18 [2022-11-03 01:36:07,364 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1374815590] [2022-11-03 01:36:07,364 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 01:36:07,365 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-03 01:36:07,365 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:36:07,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-03 01:36:07,366 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=326, Unknown=0, NotChecked=0, Total=506 [2022-11-03 01:36:07,366 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:36:07,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:36:07,515 INFO L93 Difference]: Finished difference Result 28 states and 36 transitions. [2022-11-03 01:36:07,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-03 01:36:07,515 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 states have internal predecessors, (22), 0 states have call successors, (0), 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 9 [2022-11-03 01:36:07,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:36:07,516 INFO L225 Difference]: With dead ends: 28 [2022-11-03 01:36:07,516 INFO L226 Difference]: Without dead ends: 18 [2022-11-03 01:36:07,517 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 275 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=260, Invalid=496, Unknown=0, NotChecked=0, Total=756 [2022-11-03 01:36:07,518 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 6 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 01:36:07,518 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 17 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 01:36:07,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-11-03 01:36:07,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2022-11-03 01:36:07,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:36:07,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2022-11-03 01:36:07,523 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 9 [2022-11-03 01:36:07,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:36:07,523 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2022-11-03 01:36:07,523 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:36:07,523 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2022-11-03 01:36:07,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-03 01:36:07,524 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:36:07,524 INFO L195 NwaCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1] [2022-11-03 01:36:07,560 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-03 01:36:07,724 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:36:07,725 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:36:07,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:36:07,726 INFO L85 PathProgramCache]: Analyzing trace with hash 2036093162, now seen corresponding path program 3 times [2022-11-03 01:36:07,726 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:36:07,726 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1823250594] [2022-11-03 01:36:07,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:36:07,726 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:36:07,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:36:08,010 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:36:08,010 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:36:08,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1823250594] [2022-11-03 01:36:08,011 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1823250594] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:36:08,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [999854264] [2022-11-03 01:36:08,011 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 01:36:08,011 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:36:08,012 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:36:08,013 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:36:08,021 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-03 01:36:08,094 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 01:36:08,095 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 01:36:08,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-03 01:36:08,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:36:08,303 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:36:08,303 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 01:36:08,553 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:36:08,553 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [999854264] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 01:36:08,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1021454434] [2022-11-03 01:36:08,555 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-03 01:36:08,555 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 01:36:08,555 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 01:36:08,556 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 01:36:08,556 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 01:36:09,081 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 01:36:10,073 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '427#(and (<= |ULTIMATE.start_main_~st~0#1| 1) (or (and (= 3 |ULTIMATE.start_main_~b~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1))) (and (or (and (= ~last~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|)) (and (or (and (= |ULTIMATE.start_main_~d~0#1| 0) (or (not (<= ~SIZE~0 ~last~0)) (not (= |ULTIMATE.start_main_~st~0#1| 1)))) (and (= |ULTIMATE.start_main_~d~0#1| 1) (<= ~SIZE~0 ~last~0) (= |ULTIMATE.start_main_~st~0#1| 1))) (= 2 |ULTIMATE.start_main_~a~0#1|) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= ~last~0 |ULTIMATE.start_main_~c~0#1|))))) (= 2 |ULTIMATE.start_main_~b~0#1|) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1)))))) (not (< |ULTIMATE.start_main_~c~0#1| ~SIZE~0)) (<= ~SIZE~0 20) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 20 ~SIZE~0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 (+ ~last~0 2147483648)) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (and (= ~SIZE~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~a~0#1| |ULTIMATE.start_main_~b~0#1|)) 1 0)) (<= ~last~0 2147483647) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0))' at error location [2022-11-03 01:36:10,073 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 01:36:10,074 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 01:36:10,074 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 34 [2022-11-03 01:36:10,074 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291570277] [2022-11-03 01:36:10,074 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 01:36:10,075 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-03 01:36:10,075 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:36:10,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-03 01:36:10,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=561, Invalid=921, Unknown=0, NotChecked=0, Total=1482 [2022-11-03 01:36:10,077 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 35 states, 35 states have (on average 1.1142857142857143) internal successors, (39), 34 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) [2022-11-03 01:36:10,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:36:10,403 INFO L93 Difference]: Finished difference Result 44 states and 56 transitions. [2022-11-03 01:36:10,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-03 01:36:10,404 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.1142857142857143) internal successors, (39), 34 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 15 [2022-11-03 01:36:10,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:36:10,405 INFO L225 Difference]: With dead ends: 44 [2022-11-03 01:36:10,405 INFO L226 Difference]: Without dead ends: 28 [2022-11-03 01:36:10,406 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 937 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=795, Invalid=1461, Unknown=0, NotChecked=0, Total=2256 [2022-11-03 01:36:10,407 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 14 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:36:10,407 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 17 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 01:36:10,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-03 01:36:10,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2022-11-03 01:36:10,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:36:10,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2022-11-03 01:36:10,413 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 15 [2022-11-03 01:36:10,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:36:10,413 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2022-11-03 01:36:10,414 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.1142857142857143) internal successors, (39), 34 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) [2022-11-03 01:36:10,414 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2022-11-03 01:36:10,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-03 01:36:10,414 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:36:10,415 INFO L195 NwaCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1] [2022-11-03 01:36:10,443 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-03 01:36:10,626 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:36:10,627 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:36:10,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:36:10,627 INFO L85 PathProgramCache]: Analyzing trace with hash -359343446, now seen corresponding path program 4 times [2022-11-03 01:36:10,628 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:36:10,628 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [164689893] [2022-11-03 01:36:10,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:36:10,628 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:36:10,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:36:13,228 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:36:13,228 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:36:13,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [164689893] [2022-11-03 01:36:13,229 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [164689893] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:36:13,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2086057693] [2022-11-03 01:36:13,229 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 01:36:13,229 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:36:13,229 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:36:13,235 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:36:13,266 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-03 01:36:13,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:36:13,321 WARN L261 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 76 conjunts are in the unsatisfiable core [2022-11-03 01:36:13,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:36:15,584 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:36:15,585 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 01:36:21,035 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:36:21,035 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2086057693] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 01:36:21,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [996685471] [2022-11-03 01:36:21,037 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-03 01:36:21,037 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 01:36:21,037 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 01:36:21,038 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 01:36:21,038 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 01:36:21,443 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 01:36:22,464 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '794#(and (<= |ULTIMATE.start_main_~st~0#1| 1) (or (and (= 3 |ULTIMATE.start_main_~b~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1)) (= |#NULL.base| 0)) (and (or (and (= ~last~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~st~0#1| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= 3 |ULTIMATE.start_main_~a~0#1|) (= 2 |ULTIMATE.start_main_~b~0#1|) (= |#NULL.base| 0)) (and (or (and (= |ULTIMATE.start_main_~d~0#1| 0) (or (not (<= ~SIZE~0 ~last~0)) (not (= |ULTIMATE.start_main_~st~0#1| 1)))) (and (= |ULTIMATE.start_main_~d~0#1| 1) (<= ~SIZE~0 ~last~0) (= |ULTIMATE.start_main_~st~0#1| 1))) (= 2 |ULTIMATE.start_main_~b~0#1|) (= 2 |ULTIMATE.start_main_~a~0#1|) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= ~last~0 |ULTIMATE.start_main_~c~0#1|))) (= |#NULL.base| 0))) (or (not (= |ULTIMATE.start_main_~st~0#1| 0)) (not (= |ULTIMATE.start_main_~c~0#1| (+ ~last~0 1)))))) (not (< |ULTIMATE.start_main_~c~0#1| ~SIZE~0)) (<= ~SIZE~0 20) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 20 ~SIZE~0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 (+ ~last~0 2147483648)) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (and (= ~SIZE~0 |ULTIMATE.start_main_~c~0#1|) (= |ULTIMATE.start_main_~a~0#1| |ULTIMATE.start_main_~b~0#1|)) 1 0)) (<= ~last~0 2147483647) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1))' at error location [2022-11-03 01:36:22,464 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 01:36:22,465 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 01:36:22,465 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 69 [2022-11-03 01:36:22,465 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308405701] [2022-11-03 01:36:22,465 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 01:36:22,466 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2022-11-03 01:36:22,466 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:36:22,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2022-11-03 01:36:22,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1544, Invalid=3858, Unknown=0, NotChecked=0, Total=5402 [2022-11-03 01:36:22,469 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 70 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 69 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:36:25,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:36:25,636 INFO L93 Difference]: Finished difference Result 101 states and 108 transitions. [2022-11-03 01:36:25,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-11-03 01:36:25,641 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 69 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2022-11-03 01:36:25,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:36:25,643 INFO L225 Difference]: With dead ends: 101 [2022-11-03 01:36:25,643 INFO L226 Difference]: Without dead ends: 99 [2022-11-03 01:36:25,650 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3979 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=2222, Invalid=7480, Unknown=0, NotChecked=0, Total=9702 [2022-11-03 01:36:25,656 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 27 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 259 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 01:36:25,657 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 41 Invalid, 259 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 137 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 01:36:25,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-11-03 01:36:25,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 74. [2022-11-03 01:36:25,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.0547945205479452) internal successors, (77), 73 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:36:25,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 77 transitions. [2022-11-03 01:36:25,686 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 77 transitions. Word has length 25 [2022-11-03 01:36:25,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:36:25,686 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 77 transitions. [2022-11-03 01:36:25,686 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 69 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:36:25,687 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 77 transitions. [2022-11-03 01:36:25,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-03 01:36:25,688 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:36:25,688 INFO L195 NwaCegarLoop]: trace histogram [41, 2, 2, 1, 1, 1, 1, 1] [2022-11-03 01:36:25,710 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-03 01:36:25,890 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:36:25,891 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:36:25,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:36:25,891 INFO L85 PathProgramCache]: Analyzing trace with hash 1689444428, now seen corresponding path program 1 times [2022-11-03 01:36:25,891 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:36:25,891 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [694171110] [2022-11-03 01:36:25,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:36:25,892 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:36:25,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:36:26,467 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 254 proven. 440 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2022-11-03 01:36:26,467 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:36:26,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [694171110] [2022-11-03 01:36:26,468 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [694171110] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:36:26,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [926958401] [2022-11-03 01:36:26,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:36:26,468 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:36:26,468 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:36:26,469 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:36:26,471 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-03 01:36:26,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:36:26,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-03 01:36:26,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:36:27,362 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 694 proven. 0 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2022-11-03 01:36:27,362 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 01:36:27,362 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [926958401] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 01:36:27,362 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 01:36:27,362 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [23] total 44 [2022-11-03 01:36:27,362 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1343285232] [2022-11-03 01:36:27,363 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 01:36:27,363 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-03 01:36:27,363 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:36:27,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-03 01:36:27,364 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=720, Invalid=1260, Unknown=0, NotChecked=0, Total=1980 [2022-11-03 01:36:27,365 INFO L87 Difference]: Start difference. First operand 74 states and 77 transitions. Second operand has 24 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 23 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:36:27,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:36:27,493 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2022-11-03 01:36:27,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-03 01:36:27,494 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 23 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2022-11-03 01:36:27,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:36:27,499 INFO L225 Difference]: With dead ends: 126 [2022-11-03 01:36:27,499 INFO L226 Difference]: Without dead ends: 74 [2022-11-03 01:36:27,500 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=720, Invalid=1260, Unknown=0, NotChecked=0, Total=1980 [2022-11-03 01:36:27,504 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 20 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 01:36:27,505 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 6 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 01:36:27,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2022-11-03 01:36:27,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2022-11-03 01:36:27,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.0136986301369864) internal successors, (74), 73 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:36:27,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 74 transitions. [2022-11-03 01:36:27,539 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 74 transitions. Word has length 50 [2022-11-03 01:36:27,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:36:27,540 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 74 transitions. [2022-11-03 01:36:27,540 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 23 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:36:27,540 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 74 transitions. [2022-11-03 01:36:27,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-11-03 01:36:27,542 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:36:27,542 INFO L195 NwaCegarLoop]: trace histogram [60, 3, 3, 2, 2, 1, 1, 1] [2022-11-03 01:36:27,579 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-03 01:36:27,766 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-03 01:36:27,767 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:36:27,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:36:27,767 INFO L85 PathProgramCache]: Analyzing trace with hash -1335370670, now seen corresponding path program 2 times [2022-11-03 01:36:27,768 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:36:27,768 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [475738678] [2022-11-03 01:36:27,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:36:27,768 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:36:28,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:36:54,292 INFO L134 CoverageAnalysis]: Checked inductivity of 1960 backedges. 0 proven. 1960 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:36:54,293 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:36:54,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [475738678] [2022-11-03 01:36:54,293 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [475738678] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:36:54,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1831714359] [2022-11-03 01:36:54,294 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 01:36:54,294 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:36:54,294 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:36:54,297 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:36:54,298 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-03 01:36:54,446 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2022-11-03 01:36:54,447 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 01:36:54,450 INFO L263 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 147 conjunts are in the unsatisfiable core [2022-11-03 01:36:54,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:37:03,616 INFO L134 CoverageAnalysis]: Checked inductivity of 1960 backedges. 18 proven. 1761 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2022-11-03 01:37:03,616 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 01:37:28,616 INFO L134 CoverageAnalysis]: Checked inductivity of 1960 backedges. 157 proven. 1803 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:37:28,616 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1831714359] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 01:37:28,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1053465720] [2022-11-03 01:37:28,618 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-03 01:37:28,618 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 01:37:28,619 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 01:37:28,619 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 01:37:28,619 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 01:37:30,120 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 01:37:31,305 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2372#(and (<= |ULTIMATE.start_main_~st~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 (+ ~last~0 2147483648)) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (= ~SIZE~0 20) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (<= 20 |ULTIMATE.start_main_~c~0#1|) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~last~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (<= 0 |ULTIMATE.start_main_~d~0#1|) (= |#NULL.base| 0))' at error location [2022-11-03 01:37:31,305 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 01:37:31,305 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 01:37:31,305 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 45, 69] total 180 [2022-11-03 01:37:31,305 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1911092586] [2022-11-03 01:37:31,307 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 01:37:31,310 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 181 states [2022-11-03 01:37:31,311 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:37:31,313 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 181 interpolants. [2022-11-03 01:37:31,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7035, Invalid=27375, Unknown=0, NotChecked=0, Total=34410 [2022-11-03 01:37:31,324 INFO L87 Difference]: Start difference. First operand 74 states and 74 transitions. Second operand has 181 states, 181 states have (on average 1.0718232044198894) internal successors, (194), 180 states have internal predecessors, (194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:38:06,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:38:06,617 INFO L93 Difference]: Finished difference Result 195 states and 198 transitions. [2022-11-03 01:38:06,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2022-11-03 01:38:06,617 INFO L78 Accepts]: Start accepts. Automaton has has 181 states, 181 states have (on average 1.0718232044198894) internal successors, (194), 180 states have internal predecessors, (194), 0 states have call successors, (0), 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 73 [2022-11-03 01:38:06,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:38:06,619 INFO L225 Difference]: With dead ends: 195 [2022-11-03 01:38:06,619 INFO L226 Difference]: Without dead ends: 193 [2022-11-03 01:38:06,632 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 390 GetRequests, 97 SyntacticMatches, 5 SemanticMatches, 288 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33210 ImplicationChecksByTransitivity, 59.1s TimeCoverageRelationStatistics Valid=16043, Invalid=67767, Unknown=0, NotChecked=0, Total=83810 [2022-11-03 01:38:06,632 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 220 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 2059 mSolverCounterSat, 827 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 220 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 2886 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 827 IncrementalHoareTripleChecker+Valid, 2059 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-11-03 01:38:06,633 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [220 Valid, 94 Invalid, 2886 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [827 Valid, 2059 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2022-11-03 01:38:06,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2022-11-03 01:38:06,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 170. [2022-11-03 01:38:06,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 169 states have (on average 1.0059171597633136) internal successors, (170), 169 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:38:06,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 170 transitions. [2022-11-03 01:38:06,685 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 170 transitions. Word has length 73 [2022-11-03 01:38:06,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:38:06,686 INFO L495 AbstractCegarLoop]: Abstraction has 170 states and 170 transitions. [2022-11-03 01:38:06,687 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 181 states, 181 states have (on average 1.0718232044198894) internal successors, (194), 180 states have internal predecessors, (194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:38:06,687 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 170 transitions. [2022-11-03 01:38:06,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2022-11-03 01:38:06,690 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:38:06,690 INFO L195 NwaCegarLoop]: trace histogram [140, 7, 7, 6, 6, 1, 1, 1] [2022-11-03 01:38:06,714 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-11-03 01:38:06,897 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:38:06,897 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:38:06,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:38:06,898 INFO L85 PathProgramCache]: Analyzing trace with hash 1231228834, now seen corresponding path program 3 times [2022-11-03 01:38:06,898 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:38:06,898 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1650001149] [2022-11-03 01:38:06,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:38:06,898 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:38:07,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 01:39:48,767 INFO L134 CoverageAnalysis]: Checked inductivity of 10788 backedges. 0 proven. 10788 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:39:48,767 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 01:39:48,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1650001149] [2022-11-03 01:39:48,767 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1650001149] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 01:39:48,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1594517738] [2022-11-03 01:39:48,767 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 01:39:48,768 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:39:48,768 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 01:39:48,770 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 01:39:48,772 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-03 01:39:49,003 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 01:39:49,003 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 01:39:49,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 703 conjuncts, 345 conjunts are in the unsatisfiable core [2022-11-03 01:39:49,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 01:40:49,388 INFO L134 CoverageAnalysis]: Checked inductivity of 10788 backedges. 91 proven. 10697 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:40:49,388 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 01:42:26,575 INFO L134 CoverageAnalysis]: Checked inductivity of 10788 backedges. 190 proven. 10598 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 01:42:26,575 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1594517738] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 01:42:26,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [761359684] [2022-11-03 01:42:26,578 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-03 01:42:26,578 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 01:42:26,578 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 01:42:26,579 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 01:42:26,579 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 01:42:27,753 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 01:42:30,769 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4773#(and (<= |ULTIMATE.start_main_~st~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 (+ ~last~0 2147483648)) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (= ~SIZE~0 20) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (<= 20 |ULTIMATE.start_main_~c~0#1|) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~last~0 2147483647) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (<= 0 |ULTIMATE.start_main_~d~0#1|) (= |#NULL.base| 0))' at error location [2022-11-03 01:42:30,769 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 01:42:30,770 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 01:42:30,770 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [160, 157, 157] total 471 [2022-11-03 01:42:30,770 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994831614] [2022-11-03 01:42:30,770 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 01:42:30,771 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 472 states [2022-11-03 01:42:30,772 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 01:42:30,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 472 interpolants. [2022-11-03 01:42:30,800 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39435, Invalid=187617, Unknown=0, NotChecked=0, Total=227052 [2022-11-03 01:42:30,802 INFO L87 Difference]: Start difference. First operand 170 states and 170 transitions. Second operand has 472 states, 472 states have (on average 1.0677966101694916) internal successors, (504), 471 states have internal predecessors, (504), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:46:07,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 01:46:07,370 INFO L93 Difference]: Finished difference Result 387 states and 394 transitions. [2022-11-03 01:46:07,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 307 states. [2022-11-03 01:46:07,372 INFO L78 Accepts]: Start accepts. Automaton has has 472 states, 472 states have (on average 1.0677966101694916) internal successors, (504), 471 states have internal predecessors, (504), 0 states have call successors, (0), 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 169 [2022-11-03 01:46:07,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 01:46:07,375 INFO L225 Difference]: With dead ends: 387 [2022-11-03 01:46:07,375 INFO L226 Difference]: Without dead ends: 385 [2022-11-03 01:46:07,415 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 966 GetRequests, 189 SyntacticMatches, 1 SemanticMatches, 776 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 265351 ImplicationChecksByTransitivity, 344.8s TimeCoverageRelationStatistics Valid=92589, Invalid=511917, Unknown=0, NotChecked=0, Total=604506 [2022-11-03 01:46:07,416 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 579 mSDsluCounter, 676 mSDsCounter, 0 mSdLazyCounter, 14666 mSolverCounterSat, 2951 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 579 SdHoareTripleChecker+Valid, 689 SdHoareTripleChecker+Invalid, 17617 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 2951 IncrementalHoareTripleChecker+Valid, 14666 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 18.4s IncrementalHoareTripleChecker+Time [2022-11-03 01:46:07,416 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [579 Valid, 689 Invalid, 17617 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [2951 Valid, 14666 Invalid, 0 Unknown, 0 Unchecked, 18.4s Time] [2022-11-03 01:46:07,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2022-11-03 01:46:07,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 362. [2022-11-03 01:46:07,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 362 states, 361 states have (on average 1.002770083102493) internal successors, (362), 361 states have internal predecessors, (362), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:46:07,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 362 transitions. [2022-11-03 01:46:07,671 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 362 transitions. Word has length 169 [2022-11-03 01:46:07,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 01:46:07,672 INFO L495 AbstractCegarLoop]: Abstraction has 362 states and 362 transitions. [2022-11-03 01:46:07,673 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 472 states, 472 states have (on average 1.0677966101694916) internal successors, (504), 471 states have internal predecessors, (504), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 01:46:07,673 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 362 transitions. [2022-11-03 01:46:07,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 362 [2022-11-03 01:46:07,680 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 01:46:07,680 INFO L195 NwaCegarLoop]: trace histogram [300, 15, 15, 14, 14, 1, 1, 1] [2022-11-03 01:46:07,721 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-11-03 01:46:07,904 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2465bd58-69cd-4d70-8f2e-c4c830d346cf/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 01:46:07,904 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 01:46:07,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 01:46:07,905 INFO L85 PathProgramCache]: Analyzing trace with hash 640562754, now seen corresponding path program 4 times [2022-11-03 01:46:07,905 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 01:46:07,905 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [791451589] [2022-11-03 01:46:07,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 01:46:07,905 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 01:46:08,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat