./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label47+token_ring.06.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 63182f13 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label47+token_ring.06.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF --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 8321a367d25b54b23b2762d5ecbfeee51530317d33e488964270d878a9001f5b --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-12 22:24:19,529 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-12 22:24:19,531 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-12 22:24:19,591 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-12 22:24:19,592 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-12 22:24:19,597 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-12 22:24:19,599 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-12 22:24:19,604 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-12 22:24:19,607 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-12 22:24:19,616 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-12 22:24:19,617 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-12 22:24:19,619 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-12 22:24:19,620 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-12 22:24:19,623 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-12 22:24:19,627 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-12 22:24:19,633 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-12 22:24:19,635 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-12 22:24:19,637 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-12 22:24:19,640 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-12 22:24:19,648 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-12 22:24:19,651 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-12 22:24:19,653 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-12 22:24:19,657 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-12 22:24:19,658 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-12 22:24:19,670 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-12 22:24:19,670 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-12 22:24:19,671 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-12 22:24:19,673 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-12 22:24:19,674 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-12 22:24:19,675 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-12 22:24:19,676 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-12 22:24:19,677 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-12 22:24:19,680 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-12 22:24:19,681 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-12 22:24:19,683 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-12 22:24:19,683 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-12 22:24:19,684 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-12 22:24:19,684 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-12 22:24:19,685 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-12 22:24:19,686 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-12 22:24:19,687 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-12 22:24:19,688 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-12 22:24:19,738 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-12 22:24:19,739 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-12 22:24:19,740 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-12 22:24:19,741 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-12 22:24:19,741 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-12 22:24:19,741 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-12 22:24:19,741 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-12 22:24:19,742 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-12 22:24:19,748 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-12 22:24:19,749 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-12 22:24:19,750 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-12 22:24:19,750 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-12 22:24:19,750 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-12 22:24:19,751 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-12 22:24:19,751 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-12 22:24:19,751 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-12 22:24:19,752 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-12 22:24:19,752 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-12 22:24:19,752 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-12 22:24:19,753 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-12 22:24:19,753 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-12 22:24:19,753 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-12 22:24:19,753 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-12 22:24:19,753 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-12 22:24:19,754 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-12 22:24:19,754 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-12 22:24:19,754 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-12 22:24:19,754 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-12 22:24:19,755 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-12 22:24:19,755 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-12 22:24:19,755 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-12 22:24:19,755 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 22:24:19,756 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-12 22:24:19,756 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-12 22:24:19,756 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-12 22:24:19,756 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-12 22:24:19,757 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-12 22:24:19,757 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-12 22:24:19,757 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-12 22:24:19,757 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-12 22:24:19,758 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8321a367d25b54b23b2762d5ecbfeee51530317d33e488964270d878a9001f5b [2021-11-12 22:24:20,089 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-12 22:24:20,111 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-12 22:24:20,114 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-12 22:24:20,115 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-12 22:24:20,115 INFO L275 PluginConnector]: CDTParser initialized [2021-11-12 22:24:20,116 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/combinations/Problem05_label47+token_ring.06.cil-2.c [2021-11-12 22:24:20,209 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/data/feb198344/731eb3588cfd4cfaa1830542eb309727/FLAG6ae69bfd2 [2021-11-12 22:24:21,277 INFO L306 CDTParser]: Found 1 translation units. [2021-11-12 22:24:21,277 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/sv-benchmarks/c/combinations/Problem05_label47+token_ring.06.cil-2.c [2021-11-12 22:24:21,341 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/data/feb198344/731eb3588cfd4cfaa1830542eb309727/FLAG6ae69bfd2 [2021-11-12 22:24:21,528 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/data/feb198344/731eb3588cfd4cfaa1830542eb309727 [2021-11-12 22:24:21,531 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-12 22:24:21,535 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-12 22:24:21,538 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-12 22:24:21,539 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-12 22:24:21,542 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-12 22:24:21,544 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 10:24:21" (1/1) ... [2021-11-12 22:24:21,546 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@25ed3bc5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:24:21, skipping insertion in model container [2021-11-12 22:24:21,546 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 10:24:21" (1/1) ... [2021-11-12 22:24:21,556 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-12 22:24:21,841 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 22:24:24,176 WARN L228 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_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/sv-benchmarks/c/combinations/Problem05_label47+token_ring.06.cil-2.c[377612,377625] [2021-11-12 22:24:24,212 WARN L228 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_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/sv-benchmarks/c/combinations/Problem05_label47+token_ring.06.cil-2.c[383339,383352] [2021-11-12 22:24:24,477 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 22:24:24,488 INFO L203 MainTranslator]: Completed pre-run [2021-11-12 22:24:25,838 WARN L228 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_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/sv-benchmarks/c/combinations/Problem05_label47+token_ring.06.cil-2.c[377612,377625] [2021-11-12 22:24:25,877 WARN L228 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_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/sv-benchmarks/c/combinations/Problem05_label47+token_ring.06.cil-2.c[383339,383352] [2021-11-12 22:24:25,900 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 22:24:25,985 INFO L208 MainTranslator]: Completed translation [2021-11-12 22:24:25,986 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:24:25 WrapperNode [2021-11-12 22:24:25,986 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-12 22:24:25,987 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-12 22:24:25,988 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-12 22:24:25,988 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-12 22:24:25,996 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:24:25" (1/1) ... [2021-11-12 22:24:26,116 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:24:25" (1/1) ... [2021-11-12 22:24:26,682 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-12 22:24:26,683 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-12 22:24:26,683 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-12 22:24:26,683 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-12 22:24:26,694 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:24:25" (1/1) ... [2021-11-12 22:24:26,705 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:24:25" (1/1) ... [2021-11-12 22:24:26,841 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:24:25" (1/1) ... [2021-11-12 22:24:26,841 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:24:25" (1/1) ... [2021-11-12 22:24:27,256 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:24:25" (1/1) ... [2021-11-12 22:24:27,308 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:24:25" (1/1) ... [2021-11-12 22:24:27,342 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:24:25" (1/1) ... [2021-11-12 22:24:27,417 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-12 22:24:27,418 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-12 22:24:27,418 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-12 22:24:27,419 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-12 22:24:27,420 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:24:25" (1/1) ... [2021-11-12 22:24:27,429 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 22:24:27,441 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:24:27,460 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-12 22:24:27,476 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-12 22:24:27,518 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-12 22:24:27,518 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-12 22:24:27,518 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-12 22:24:27,518 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-12 22:24:27,519 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-12 22:24:27,519 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-12 22:24:27,519 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-12 22:24:27,519 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-12 22:24:27,520 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-12 22:24:27,520 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-12 22:24:27,520 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-12 22:24:27,520 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-12 22:24:27,520 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-12 22:24:27,521 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-12 22:24:27,521 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-12 22:24:27,521 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-12 22:24:39,286 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-12 22:24:39,287 INFO L299 CfgBuilder]: Removed 10 assume(true) statements. [2021-11-12 22:24:39,292 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 10:24:39 BoogieIcfgContainer [2021-11-12 22:24:39,292 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-12 22:24:39,295 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-12 22:24:39,295 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-12 22:24:39,299 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-12 22:24:39,299 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 10:24:21" (1/3) ... [2021-11-12 22:24:39,300 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6710d3f3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 10:24:39, skipping insertion in model container [2021-11-12 22:24:39,300 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:24:25" (2/3) ... [2021-11-12 22:24:39,301 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6710d3f3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 10:24:39, skipping insertion in model container [2021-11-12 22:24:39,301 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 10:24:39" (3/3) ... [2021-11-12 22:24:39,302 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem05_label47+token_ring.06.cil-2.c [2021-11-12 22:24:39,309 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-12 22:24:39,309 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-12 22:24:39,373 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-12 22:24:39,381 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-12 22:24:39,381 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-12 22:24:39,446 INFO L276 IsEmpty]: Start isEmpty. Operand has 1765 states, 1736 states have (on average 1.9683179723502304) internal successors, (3417), 1739 states have internal predecessors, (3417), 20 states have call successors, (20), 6 states have call predecessors, (20), 6 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-12 22:24:39,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-12 22:24:39,456 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:24:39,457 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:24:39,458 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:24:39,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:24:39,464 INFO L85 PathProgramCache]: Analyzing trace with hash -1229141609, now seen corresponding path program 1 times [2021-11-12 22:24:39,476 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:24:39,476 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1868706692] [2021-11-12 22:24:39,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:24:39,478 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:24:39,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:24:39,789 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:24:39,790 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:24:39,790 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1868706692] [2021-11-12 22:24:39,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1868706692] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:24:39,805 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:24:39,806 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-12 22:24:39,808 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1887192393] [2021-11-12 22:24:39,809 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:24:39,814 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 22:24:39,814 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:24:39,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 22:24:39,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:24:39,865 INFO L87 Difference]: Start difference. First operand has 1765 states, 1736 states have (on average 1.9683179723502304) internal successors, (3417), 1739 states have internal predecessors, (3417), 20 states have call successors, (20), 6 states have call predecessors, (20), 6 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) Second operand has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-12 22:24:40,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:24:40,937 INFO L93 Difference]: Finished difference Result 3635 states and 7091 transitions. [2021-11-12 22:24:40,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 22:24:40,940 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 49 [2021-11-12 22:24:40,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:24:40,978 INFO L225 Difference]: With dead ends: 3635 [2021-11-12 22:24:40,978 INFO L226 Difference]: Without dead ends: 1869 [2021-11-12 22:24:40,991 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:24:41,000 INFO L933 BasicCegarLoop]: 3331 mSDtfsCounter, 3581 mSDsluCounter, 3529 mSDsCounter, 0 mSdLazyCounter, 630 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 580.49ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3581 SdHoareTripleChecker+Valid, 6588 SdHoareTripleChecker+Invalid, 644 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 41.97ms SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 630 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 806.51ms IncrementalHoareTripleChecker+Time [2021-11-12 22:24:41,002 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3581 Valid, 6588 Invalid, 644 Unknown, 0 Unchecked, 41.97ms Time], IncrementalHoareTripleChecker [14 Valid, 630 Invalid, 0 Unknown, 0 Unchecked, 806.51ms Time] [2021-11-12 22:24:41,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1869 states. [2021-11-12 22:24:41,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1869 to 1868. [2021-11-12 22:24:41,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1868 states, 1818 states have (on average 1.9405940594059405) internal successors, (3528), 1821 states have internal predecessors, (3528), 36 states have call successors, (36), 12 states have call predecessors, (36), 12 states have return successors, (36), 35 states have call predecessors, (36), 36 states have call successors, (36) [2021-11-12 22:24:41,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1868 states to 1868 states and 3600 transitions. [2021-11-12 22:24:41,219 INFO L78 Accepts]: Start accepts. Automaton has 1868 states and 3600 transitions. Word has length 49 [2021-11-12 22:24:41,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:24:41,220 INFO L470 AbstractCegarLoop]: Abstraction has 1868 states and 3600 transitions. [2021-11-12 22:24:41,220 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-12 22:24:41,220 INFO L276 IsEmpty]: Start isEmpty. Operand 1868 states and 3600 transitions. [2021-11-12 22:24:41,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-12 22:24:41,232 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:24:41,232 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:24:41,233 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-12 22:24:41,236 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:24:41,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:24:41,241 INFO L85 PathProgramCache]: Analyzing trace with hash 744988310, now seen corresponding path program 1 times [2021-11-12 22:24:41,242 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:24:41,242 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [238533200] [2021-11-12 22:24:41,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:24:41,243 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:24:41,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:24:41,484 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 22:24:41,485 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:24:41,485 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [238533200] [2021-11-12 22:24:41,485 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [238533200] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:24:41,486 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1834476299] [2021-11-12 22:24:41,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:24:41,487 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:24:41,488 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:24:41,490 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:24:41,494 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-12 22:24:41,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:24:41,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 636 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:24:41,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:24:41,986 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-12 22:24:41,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:24:42,228 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-12 22:24:42,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1834476299] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 22:24:42,230 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:24:42,230 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 22:24:42,231 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178705017] [2021-11-12 22:24:42,232 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:24:42,233 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:24:42,233 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:24:42,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:24:42,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:24:42,235 INFO L87 Difference]: Start difference. First operand 1868 states and 3600 transitions. Second operand has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 2 states have internal predecessors, (67), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 22:24:43,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:24:43,028 INFO L93 Difference]: Finished difference Result 2305 states and 4255 transitions. [2021-11-12 22:24:43,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:24:43,030 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 2 states have internal predecessors, (67), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 94 [2021-11-12 22:24:43,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:24:43,048 INFO L225 Difference]: With dead ends: 2305 [2021-11-12 22:24:43,048 INFO L226 Difference]: Without dead ends: 2083 [2021-11-12 22:24:43,050 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 185 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:24:43,051 INFO L933 BasicCegarLoop]: 3241 mSDtfsCounter, 3411 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 280 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 416.10ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3411 SdHoareTripleChecker+Valid, 3376 SdHoareTripleChecker+Invalid, 282 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 153.56ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 280 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 535.92ms IncrementalHoareTripleChecker+Time [2021-11-12 22:24:43,052 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3411 Valid, 3376 Invalid, 282 Unknown, 0 Unchecked, 153.56ms Time], IncrementalHoareTripleChecker [2 Valid, 280 Invalid, 0 Unknown, 0 Unchecked, 535.92ms Time] [2021-11-12 22:24:43,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2083 states. [2021-11-12 22:24:43,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2083 to 2079. [2021-11-12 22:24:43,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2079 states, 1987 states have (on average 1.898842476094615) internal successors, (3773), 1991 states have internal predecessors, (3773), 66 states have call successors, (66), 24 states have call predecessors, (66), 24 states have return successors, (66), 64 states have call predecessors, (66), 66 states have call successors, (66) [2021-11-12 22:24:43,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2079 states to 2079 states and 3905 transitions. [2021-11-12 22:24:43,143 INFO L78 Accepts]: Start accepts. Automaton has 2079 states and 3905 transitions. Word has length 94 [2021-11-12 22:24:43,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:24:43,144 INFO L470 AbstractCegarLoop]: Abstraction has 2079 states and 3905 transitions. [2021-11-12 22:24:43,144 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 2 states have internal predecessors, (67), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 22:24:43,144 INFO L276 IsEmpty]: Start isEmpty. Operand 2079 states and 3905 transitions. [2021-11-12 22:24:43,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-12 22:24:43,149 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:24:43,149 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:24:43,189 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-12 22:24:43,365 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:24:43,366 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:24:43,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:24:43,367 INFO L85 PathProgramCache]: Analyzing trace with hash 1611126646, now seen corresponding path program 1 times [2021-11-12 22:24:43,367 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:24:43,367 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1894474048] [2021-11-12 22:24:43,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:24:43,368 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:24:43,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:24:43,491 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 22:24:43,491 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:24:43,492 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1894474048] [2021-11-12 22:24:43,499 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1894474048] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:24:43,500 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [574388343] [2021-11-12 22:24:43,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:24:43,500 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:24:43,500 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:24:43,501 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:24:43,525 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-12 22:24:43,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:24:43,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 630 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:24:43,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:24:43,887 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-12 22:24:43,887 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:24:44,099 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-12 22:24:44,099 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [574388343] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 22:24:44,099 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:24:44,100 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 22:24:44,100 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1615485311] [2021-11-12 22:24:44,100 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:24:44,101 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:24:44,101 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:24:44,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:24:44,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:24:44,103 INFO L87 Difference]: Start difference. First operand 2079 states and 3905 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 2 states have internal predecessors, (61), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 22:24:44,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:24:44,669 INFO L93 Difference]: Finished difference Result 2932 states and 5176 transitions. [2021-11-12 22:24:44,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:24:44,670 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 2 states have internal predecessors, (61), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 94 [2021-11-12 22:24:44,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:24:44,696 INFO L225 Difference]: With dead ends: 2932 [2021-11-12 22:24:44,697 INFO L226 Difference]: Without dead ends: 2499 [2021-11-12 22:24:44,700 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 185 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:24:44,704 INFO L933 BasicCegarLoop]: 3240 mSDtfsCounter, 3417 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 280 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 349.48ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3417 SdHoareTripleChecker+Valid, 3375 SdHoareTripleChecker+Invalid, 282 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 17.02ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 280 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 414.06ms IncrementalHoareTripleChecker+Time [2021-11-12 22:24:44,706 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3417 Valid, 3375 Invalid, 282 Unknown, 0 Unchecked, 17.02ms Time], IncrementalHoareTripleChecker [2 Valid, 280 Invalid, 0 Unknown, 0 Unchecked, 414.06ms Time] [2021-11-12 22:24:44,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2499 states. [2021-11-12 22:24:44,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2499 to 2493. [2021-11-12 22:24:44,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2493 states, 2319 states have (on average 1.833117723156533) internal successors, (4251), 2325 states have internal predecessors, (4251), 124 states have call successors, (124), 48 states have call predecessors, (124), 48 states have return successors, (124), 120 states have call predecessors, (124), 124 states have call successors, (124) [2021-11-12 22:24:44,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2493 states to 2493 states and 4499 transitions. [2021-11-12 22:24:44,850 INFO L78 Accepts]: Start accepts. Automaton has 2493 states and 4499 transitions. Word has length 94 [2021-11-12 22:24:44,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:24:44,852 INFO L470 AbstractCegarLoop]: Abstraction has 2493 states and 4499 transitions. [2021-11-12 22:24:44,852 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 2 states have internal predecessors, (61), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 22:24:44,853 INFO L276 IsEmpty]: Start isEmpty. Operand 2493 states and 4499 transitions. [2021-11-12 22:24:44,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-12 22:24:44,861 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:24:44,862 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:24:44,906 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-12 22:24:45,083 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:24:45,083 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:24:45,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:24:45,084 INFO L85 PathProgramCache]: Analyzing trace with hash 34728022, now seen corresponding path program 1 times [2021-11-12 22:24:45,084 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:24:45,085 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [630679993] [2021-11-12 22:24:45,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:24:45,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:24:45,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:24:45,217 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 22:24:45,218 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:24:45,218 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [630679993] [2021-11-12 22:24:45,218 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [630679993] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:24:45,219 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1386103948] [2021-11-12 22:24:45,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:24:45,219 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:24:45,220 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:24:45,230 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:24:45,232 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-12 22:24:45,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:24:45,414 INFO L263 TraceCheckSpWp]: Trace formula consists of 624 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:24:45,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:24:45,662 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-12 22:24:45,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:24:45,896 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-12 22:24:45,897 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1386103948] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 22:24:45,897 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:24:45,897 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 22:24:45,897 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1435499937] [2021-11-12 22:24:45,897 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:24:45,898 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:24:45,898 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:24:45,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:24:45,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:24:45,899 INFO L87 Difference]: Start difference. First operand 2493 states and 4499 transitions. Second operand has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 22:24:46,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:24:46,414 INFO L93 Difference]: Finished difference Result 4162 states and 6968 transitions. [2021-11-12 22:24:46,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:24:46,415 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 94 [2021-11-12 22:24:46,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:24:46,445 INFO L225 Difference]: With dead ends: 4162 [2021-11-12 22:24:46,445 INFO L226 Difference]: Without dead ends: 3315 [2021-11-12 22:24:46,453 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 185 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:24:46,456 INFO L933 BasicCegarLoop]: 3214 mSDtfsCounter, 3420 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 308.69ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3420 SdHoareTripleChecker+Valid, 3349 SdHoareTripleChecker+Invalid, 279 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 20.82ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 367.57ms IncrementalHoareTripleChecker+Time [2021-11-12 22:24:46,460 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3420 Valid, 3349 Invalid, 279 Unknown, 0 Unchecked, 20.82ms Time], IncrementalHoareTripleChecker [2 Valid, 277 Invalid, 0 Unknown, 0 Unchecked, 367.57ms Time] [2021-11-12 22:24:46,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3315 states. [2021-11-12 22:24:46,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3315 to 3305. [2021-11-12 22:24:46,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3305 states, 2971 states have (on average 1.7445304611242005) internal successors, (5183), 2981 states have internal predecessors, (5183), 236 states have call successors, (236), 96 states have call predecessors, (236), 96 states have return successors, (236), 228 states have call predecessors, (236), 236 states have call successors, (236) [2021-11-12 22:24:46,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3305 states to 3305 states and 5655 transitions. [2021-11-12 22:24:46,633 INFO L78 Accepts]: Start accepts. Automaton has 3305 states and 5655 transitions. Word has length 94 [2021-11-12 22:24:46,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:24:46,634 INFO L470 AbstractCegarLoop]: Abstraction has 3305 states and 5655 transitions. [2021-11-12 22:24:46,634 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 22:24:46,634 INFO L276 IsEmpty]: Start isEmpty. Operand 3305 states and 5655 transitions. [2021-11-12 22:24:46,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-12 22:24:46,641 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:24:46,641 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:24:46,682 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-12 22:24:46,869 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:24:46,870 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:24:46,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:24:46,870 INFO L85 PathProgramCache]: Analyzing trace with hash -1284265098, now seen corresponding path program 1 times [2021-11-12 22:24:46,871 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:24:46,871 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [727272221] [2021-11-12 22:24:46,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:24:46,871 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:24:46,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:24:46,951 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-12 22:24:46,951 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:24:46,951 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [727272221] [2021-11-12 22:24:46,952 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [727272221] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:24:46,952 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:24:46,952 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-12 22:24:46,952 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822666973] [2021-11-12 22:24:46,952 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:24:46,953 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:24:46,953 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:24:46,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:24:46,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 22:24:46,954 INFO L87 Difference]: Start difference. First operand 3305 states and 5655 transitions. Second operand has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-12 22:24:47,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:24:47,621 INFO L93 Difference]: Finished difference Result 4595 states and 7568 transitions. [2021-11-12 22:24:47,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:24:47,622 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 94 [2021-11-12 22:24:47,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:24:47,653 INFO L225 Difference]: With dead ends: 4595 [2021-11-12 22:24:47,654 INFO L226 Difference]: Without dead ends: 3745 [2021-11-12 22:24:47,659 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 22:24:47,660 INFO L933 BasicCegarLoop]: 3276 mSDtfsCounter, 73 mSDsluCounter, 3444 mSDsCounter, 0 mSdLazyCounter, 504 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 411.74ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 6482 SdHoareTripleChecker+Invalid, 504 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 14.45ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 504 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 507.38ms IncrementalHoareTripleChecker+Time [2021-11-12 22:24:47,660 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 6482 Invalid, 504 Unknown, 0 Unchecked, 14.45ms Time], IncrementalHoareTripleChecker [0 Valid, 504 Invalid, 0 Unknown, 0 Unchecked, 507.38ms Time] [2021-11-12 22:24:47,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3745 states. [2021-11-12 22:24:47,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3745 to 3589. [2021-11-12 22:24:47,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3589 states, 3239 states have (on average 1.7409694350108058) internal successors, (5639), 3249 states have internal predecessors, (5639), 244 states have call successors, (244), 104 states have call predecessors, (244), 104 states have return successors, (244), 236 states have call predecessors, (244), 244 states have call successors, (244) [2021-11-12 22:24:47,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3589 states to 3589 states and 6127 transitions. [2021-11-12 22:24:47,819 INFO L78 Accepts]: Start accepts. Automaton has 3589 states and 6127 transitions. Word has length 94 [2021-11-12 22:24:47,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:24:47,819 INFO L470 AbstractCegarLoop]: Abstraction has 3589 states and 6127 transitions. [2021-11-12 22:24:47,820 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-12 22:24:47,820 INFO L276 IsEmpty]: Start isEmpty. Operand 3589 states and 6127 transitions. [2021-11-12 22:24:47,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-12 22:24:47,829 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:24:47,830 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:24:47,830 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-12 22:24:47,830 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:24:47,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:24:47,831 INFO L85 PathProgramCache]: Analyzing trace with hash 1405561213, now seen corresponding path program 1 times [2021-11-12 22:24:47,831 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:24:47,831 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1216007358] [2021-11-12 22:24:47,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:24:47,832 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:24:47,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:24:47,922 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-12 22:24:47,923 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:24:47,923 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1216007358] [2021-11-12 22:24:47,923 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1216007358] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:24:47,923 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:24:47,924 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-12 22:24:47,924 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2103178280] [2021-11-12 22:24:47,924 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:24:47,925 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:24:47,925 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:24:47,925 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:24:47,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 22:24:47,926 INFO L87 Difference]: Start difference. First operand 3589 states and 6127 transitions. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 22:24:48,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:24:48,585 INFO L93 Difference]: Finished difference Result 7402 states and 11820 transitions. [2021-11-12 22:24:48,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:24:48,585 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 126 [2021-11-12 22:24:48,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:24:48,629 INFO L225 Difference]: With dead ends: 7402 [2021-11-12 22:24:48,629 INFO L226 Difference]: Without dead ends: 5459 [2021-11-12 22:24:48,639 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 22:24:48,640 INFO L933 BasicCegarLoop]: 3216 mSDtfsCounter, 3409 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 339.37ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3409 SdHoareTripleChecker+Valid, 3351 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 10.56ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 404.99ms IncrementalHoareTripleChecker+Time [2021-11-12 22:24:48,643 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3409 Valid, 3351 Invalid, 277 Unknown, 0 Unchecked, 10.56ms Time], IncrementalHoareTripleChecker [2 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 404.99ms Time] [2021-11-12 22:24:48,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5459 states. [2021-11-12 22:24:48,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5459 to 5433. [2021-11-12 22:24:48,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5433 states, 4755 states have (on average 1.6502628811777076) internal successors, (7847), 4773 states have internal predecessors, (7847), 468 states have call successors, (468), 208 states have call predecessors, (468), 208 states have return successors, (468), 452 states have call predecessors, (468), 468 states have call successors, (468) [2021-11-12 22:24:48,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5433 states to 5433 states and 8783 transitions. [2021-11-12 22:24:48,923 INFO L78 Accepts]: Start accepts. Automaton has 5433 states and 8783 transitions. Word has length 126 [2021-11-12 22:24:48,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:24:48,925 INFO L470 AbstractCegarLoop]: Abstraction has 5433 states and 8783 transitions. [2021-11-12 22:24:48,926 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 22:24:48,926 INFO L276 IsEmpty]: Start isEmpty. Operand 5433 states and 8783 transitions. [2021-11-12 22:24:48,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-12 22:24:48,942 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:24:48,944 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:24:48,944 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-12 22:24:48,945 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:24:48,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:24:48,945 INFO L85 PathProgramCache]: Analyzing trace with hash 468975276, now seen corresponding path program 1 times [2021-11-12 22:24:48,945 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:24:48,946 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1158448380] [2021-11-12 22:24:48,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:24:48,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:24:48,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:24:49,053 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-12 22:24:49,053 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:24:49,053 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1158448380] [2021-11-12 22:24:49,053 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1158448380] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:24:49,054 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:24:49,054 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-12 22:24:49,054 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842767791] [2021-11-12 22:24:49,055 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:24:49,055 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:24:49,055 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:24:49,056 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:24:49,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 22:24:49,059 INFO L87 Difference]: Start difference. First operand 5433 states and 8783 transitions. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 22:24:49,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:24:49,744 INFO L93 Difference]: Finished difference Result 12862 states and 19764 transitions. [2021-11-12 22:24:49,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:24:49,745 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 126 [2021-11-12 22:24:49,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:24:50,068 INFO L225 Difference]: With dead ends: 12862 [2021-11-12 22:24:50,069 INFO L226 Difference]: Without dead ends: 9075 [2021-11-12 22:24:50,084 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 22:24:50,085 INFO L933 BasicCegarLoop]: 3216 mSDtfsCounter, 3411 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 317.80ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3411 SdHoareTripleChecker+Valid, 3351 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.04ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 378.47ms IncrementalHoareTripleChecker+Time [2021-11-12 22:24:50,085 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3411 Valid, 3351 Invalid, 277 Unknown, 0 Unchecked, 8.04ms Time], IncrementalHoareTripleChecker [2 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 378.47ms Time] [2021-11-12 22:24:50,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9075 states. [2021-11-12 22:24:50,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9075 to 9025. [2021-11-12 22:24:50,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9025 states, 7707 states have (on average 1.5703905540417802) internal successors, (12103), 7741 states have internal predecessors, (12103), 900 states have call successors, (900), 416 states have call predecessors, (900), 416 states have return successors, (900), 868 states have call predecessors, (900), 900 states have call successors, (900) [2021-11-12 22:24:50,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9025 states to 9025 states and 13903 transitions. [2021-11-12 22:24:50,653 INFO L78 Accepts]: Start accepts. Automaton has 9025 states and 13903 transitions. Word has length 126 [2021-11-12 22:24:50,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:24:50,655 INFO L470 AbstractCegarLoop]: Abstraction has 9025 states and 13903 transitions. [2021-11-12 22:24:50,655 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 22:24:50,655 INFO L276 IsEmpty]: Start isEmpty. Operand 9025 states and 13903 transitions. [2021-11-12 22:24:50,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-12 22:24:50,690 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:24:50,690 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:24:50,691 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-12 22:24:50,691 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:24:50,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:24:50,692 INFO L85 PathProgramCache]: Analyzing trace with hash -1924048076, now seen corresponding path program 1 times [2021-11-12 22:24:50,692 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:24:50,693 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [609186766] [2021-11-12 22:24:50,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:24:50,693 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:24:50,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:24:50,800 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-12 22:24:50,800 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:24:50,800 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [609186766] [2021-11-12 22:24:50,801 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [609186766] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:24:50,801 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:24:50,801 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-12 22:24:50,801 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [134651100] [2021-11-12 22:24:50,801 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:24:50,802 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:24:50,803 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:24:50,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:24:50,803 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 22:24:50,803 INFO L87 Difference]: Start difference. First operand 9025 states and 13903 transitions. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 22:24:51,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:24:51,867 INFO L93 Difference]: Finished difference Result 23494 states and 35060 transitions. [2021-11-12 22:24:51,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:24:51,868 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 126 [2021-11-12 22:24:51,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:24:51,966 INFO L225 Difference]: With dead ends: 23494 [2021-11-12 22:24:51,967 INFO L226 Difference]: Without dead ends: 16115 [2021-11-12 22:24:52,010 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 22:24:52,011 INFO L933 BasicCegarLoop]: 3230 mSDtfsCounter, 3414 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 382.33ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3414 SdHoareTripleChecker+Valid, 3365 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 11.54ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 453.82ms IncrementalHoareTripleChecker+Time [2021-11-12 22:24:52,011 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3414 Valid, 3365 Invalid, 277 Unknown, 0 Unchecked, 11.54ms Time], IncrementalHoareTripleChecker [2 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 453.82ms Time] [2021-11-12 22:24:52,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16115 states. [2021-11-12 22:24:52,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16115 to 16017. [2021-11-12 22:24:52,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16017 states, 13451 states have (on average 1.5088097539216414) internal successors, (20295), 13517 states have internal predecessors, (20295), 1732 states have call successors, (1732), 832 states have call predecessors, (1732), 832 states have return successors, (1732), 1668 states have call predecessors, (1732), 1732 states have call successors, (1732) [2021-11-12 22:24:53,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16017 states to 16017 states and 23759 transitions. [2021-11-12 22:24:53,012 INFO L78 Accepts]: Start accepts. Automaton has 16017 states and 23759 transitions. Word has length 126 [2021-11-12 22:24:53,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:24:53,012 INFO L470 AbstractCegarLoop]: Abstraction has 16017 states and 23759 transitions. [2021-11-12 22:24:53,012 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 22:24:53,013 INFO L276 IsEmpty]: Start isEmpty. Operand 16017 states and 23759 transitions. [2021-11-12 22:24:53,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-12 22:24:53,076 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:24:53,076 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:24:53,076 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-12 22:24:53,077 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:24:53,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:24:53,077 INFO L85 PathProgramCache]: Analyzing trace with hash 1666018246, now seen corresponding path program 1 times [2021-11-12 22:24:53,077 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:24:53,078 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [598867686] [2021-11-12 22:24:53,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:24:53,078 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:24:53,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:24:53,151 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 20 proven. 6 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2021-11-12 22:24:53,152 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:24:53,152 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [598867686] [2021-11-12 22:24:53,152 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [598867686] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:24:53,152 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1872586763] [2021-11-12 22:24:53,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:24:53,153 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:24:53,153 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:24:53,154 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:24:53,176 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-12 22:24:53,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:24:53,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 823 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:24:53,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:24:53,635 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 79 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-12 22:24:53,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:24:53,966 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2021-11-12 22:24:53,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1872586763] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:24:53,967 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-12 22:24:53,967 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 7 [2021-11-12 22:24:53,968 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475249254] [2021-11-12 22:24:53,968 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:24:53,969 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 22:24:53,969 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:24:53,969 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 22:24:53,969 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:24:53,970 INFO L87 Difference]: Start difference. First operand 16017 states and 23759 transitions. Second operand has 4 states, 4 states have (on average 28.5) internal successors, (114), 4 states have internal predecessors, (114), 4 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) [2021-11-12 22:24:55,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:24:55,321 INFO L93 Difference]: Finished difference Result 30805 states and 45105 transitions. [2021-11-12 22:24:55,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 22:24:55,321 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 28.5) internal successors, (114), 4 states have internal predecessors, (114), 4 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) Word has length 145 [2021-11-12 22:24:55,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:24:55,427 INFO L225 Difference]: With dead ends: 30805 [2021-11-12 22:24:55,427 INFO L226 Difference]: Without dead ends: 23427 [2021-11-12 22:24:55,459 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 288 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:24:55,543 INFO L933 BasicCegarLoop]: 3314 mSDtfsCounter, 254 mSDsluCounter, 3487 mSDsCounter, 0 mSdLazyCounter, 516 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 425.55ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 6558 SdHoareTripleChecker+Invalid, 530 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 17.61ms SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 516 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 519.76ms IncrementalHoareTripleChecker+Time [2021-11-12 22:24:55,544 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [254 Valid, 6558 Invalid, 530 Unknown, 0 Unchecked, 17.61ms Time], IncrementalHoareTripleChecker [14 Valid, 516 Invalid, 0 Unknown, 0 Unchecked, 519.76ms Time] [2021-11-12 22:24:55,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23427 states. [2021-11-12 22:24:56,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23427 to 18913. [2021-11-12 22:24:56,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18913 states, 16155 states have (on average 1.5355617455896007) internal successors, (24807), 16221 states have internal predecessors, (24807), 1828 states have call successors, (1828), 928 states have call predecessors, (1828), 928 states have return successors, (1828), 1764 states have call predecessors, (1828), 1828 states have call successors, (1828) [2021-11-12 22:24:56,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18913 states to 18913 states and 28463 transitions. [2021-11-12 22:24:56,678 INFO L78 Accepts]: Start accepts. Automaton has 18913 states and 28463 transitions. Word has length 145 [2021-11-12 22:24:56,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:24:56,679 INFO L470 AbstractCegarLoop]: Abstraction has 18913 states and 28463 transitions. [2021-11-12 22:24:56,679 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 28.5) internal successors, (114), 4 states have internal predecessors, (114), 4 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) [2021-11-12 22:24:56,680 INFO L276 IsEmpty]: Start isEmpty. Operand 18913 states and 28463 transitions. [2021-11-12 22:24:56,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-12 22:24:56,754 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:24:56,754 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:24:56,799 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-12 22:24:56,969 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-12 22:24:56,970 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:24:56,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:24:56,970 INFO L85 PathProgramCache]: Analyzing trace with hash -1265653626, now seen corresponding path program 2 times [2021-11-12 22:24:56,970 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:24:56,970 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1648989913] [2021-11-12 22:24:56,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:24:56,971 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:24:56,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:24:57,097 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 10 proven. 45 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-12 22:24:57,098 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:24:57,098 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1648989913] [2021-11-12 22:24:57,098 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1648989913] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:24:57,098 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1021606534] [2021-11-12 22:24:57,098 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:24:57,099 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:24:57,099 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:24:57,102 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:24:57,121 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-12 22:24:57,286 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-12 22:24:57,286 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:24:57,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 537 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 22:24:57,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:24:57,645 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 64 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-12 22:24:57,646 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:24:57,943 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 21 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-12 22:24:57,944 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1021606534] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:24:57,944 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-12 22:24:57,944 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 4] imperfect sequences [6] total 8 [2021-11-12 22:24:57,944 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1735280237] [2021-11-12 22:24:57,945 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:24:57,945 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 22:24:57,946 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:24:57,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 22:24:57,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-12 22:24:57,946 INFO L87 Difference]: Start difference. First operand 18913 states and 28463 transitions. Second operand has 4 states, 4 states have (on average 24.25) internal successors, (97), 4 states have internal predecessors, (97), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-12 22:24:59,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:24:59,208 INFO L93 Difference]: Finished difference Result 29253 states and 44337 transitions. [2021-11-12 22:24:59,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 22:24:59,209 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 24.25) internal successors, (97), 4 states have internal predecessors, (97), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) Word has length 145 [2021-11-12 22:24:59,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:24:59,286 INFO L225 Difference]: With dead ends: 29253 [2021-11-12 22:24:59,286 INFO L226 Difference]: Without dead ends: 18979 [2021-11-12 22:24:59,326 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 290 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-12 22:24:59,327 INFO L933 BasicCegarLoop]: 3328 mSDtfsCounter, 3570 mSDsluCounter, 3522 mSDsCounter, 0 mSdLazyCounter, 614 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 448.55ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3570 SdHoareTripleChecker+Valid, 6586 SdHoareTripleChecker+Invalid, 619 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 26.48ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 614 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 542.46ms IncrementalHoareTripleChecker+Time [2021-11-12 22:24:59,328 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3570 Valid, 6586 Invalid, 619 Unknown, 0 Unchecked, 26.48ms Time], IncrementalHoareTripleChecker [5 Valid, 614 Invalid, 0 Unknown, 0 Unchecked, 542.46ms Time] [2021-11-12 22:24:59,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18979 states. [2021-11-12 22:25:00,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18979 to 18849. [2021-11-12 22:25:00,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18849 states, 16091 states have (on average 1.5217823628115095) internal successors, (24487), 16157 states have internal predecessors, (24487), 1828 states have call successors, (1828), 928 states have call predecessors, (1828), 928 states have return successors, (1828), 1764 states have call predecessors, (1828), 1828 states have call successors, (1828) [2021-11-12 22:25:00,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18849 states to 18849 states and 28143 transitions. [2021-11-12 22:25:00,184 INFO L78 Accepts]: Start accepts. Automaton has 18849 states and 28143 transitions. Word has length 145 [2021-11-12 22:25:00,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:25:00,185 INFO L470 AbstractCegarLoop]: Abstraction has 18849 states and 28143 transitions. [2021-11-12 22:25:00,185 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 24.25) internal successors, (97), 4 states have internal predecessors, (97), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-12 22:25:00,186 INFO L276 IsEmpty]: Start isEmpty. Operand 18849 states and 28143 transitions. [2021-11-12 22:25:00,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-12 22:25:00,229 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:25:00,229 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:25:00,276 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-12 22:25:00,457 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:25:00,458 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:25:00,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:25:00,458 INFO L85 PathProgramCache]: Analyzing trace with hash -785340024, now seen corresponding path program 1 times [2021-11-12 22:25:00,458 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:25:00,458 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [400033164] [2021-11-12 22:25:00,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:25:00,459 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:25:00,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:25:00,774 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 43 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-12 22:25:00,775 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:25:00,775 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [400033164] [2021-11-12 22:25:00,775 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [400033164] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:25:00,775 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1368058653] [2021-11-12 22:25:00,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:25:00,776 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:25:00,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:25:00,777 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:25:00,796 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-12 22:25:00,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:25:00,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 829 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 22:25:00,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:25:01,204 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 80 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-12 22:25:01,204 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:25:01,464 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 43 proven. 20 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-12 22:25:01,465 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1368058653] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 22:25:01,465 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:25:01,465 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6, 4] total 8 [2021-11-12 22:25:01,466 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [831004145] [2021-11-12 22:25:01,466 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:25:01,466 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:25:01,467 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:25:01,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:25:01,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-12 22:25:01,468 INFO L87 Difference]: Start difference. First operand 18849 states and 28143 transitions. Second operand has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-12 22:25:02,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:25:02,708 INFO L93 Difference]: Finished difference Result 27757 states and 41601 transitions. [2021-11-12 22:25:02,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:25:02,709 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 145 [2021-11-12 22:25:02,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:25:02,775 INFO L225 Difference]: With dead ends: 27757 [2021-11-12 22:25:02,775 INFO L226 Difference]: Without dead ends: 18915 [2021-11-12 22:25:02,797 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 290 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-12 22:25:02,799 INFO L933 BasicCegarLoop]: 3313 mSDtfsCounter, 138 mSDsluCounter, 3431 mSDsCounter, 0 mSdLazyCounter, 512 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 474.25ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 6505 SdHoareTripleChecker+Invalid, 514 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 12.15ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 512 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 553.03ms IncrementalHoareTripleChecker+Time [2021-11-12 22:25:02,799 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 6505 Invalid, 514 Unknown, 0 Unchecked, 12.15ms Time], IncrementalHoareTripleChecker [2 Valid, 512 Invalid, 0 Unknown, 0 Unchecked, 553.03ms Time] [2021-11-12 22:25:02,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18915 states. [2021-11-12 22:25:03,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18915 to 18689. [2021-11-12 22:25:03,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18689 states, 15931 states have (on average 1.5049274998430733) internal successors, (23975), 15997 states have internal predecessors, (23975), 1828 states have call successors, (1828), 928 states have call predecessors, (1828), 928 states have return successors, (1828), 1764 states have call predecessors, (1828), 1828 states have call successors, (1828) [2021-11-12 22:25:03,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18689 states to 18689 states and 27631 transitions. [2021-11-12 22:25:03,599 INFO L78 Accepts]: Start accepts. Automaton has 18689 states and 27631 transitions. Word has length 145 [2021-11-12 22:25:03,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:25:03,600 INFO L470 AbstractCegarLoop]: Abstraction has 18689 states and 27631 transitions. [2021-11-12 22:25:03,600 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-12 22:25:03,600 INFO L276 IsEmpty]: Start isEmpty. Operand 18689 states and 27631 transitions. [2021-11-12 22:25:03,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-12 22:25:03,641 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:25:03,641 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:25:03,684 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-12 22:25:03,869 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:25:03,870 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:25:03,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:25:03,870 INFO L85 PathProgramCache]: Analyzing trace with hash 326190150, now seen corresponding path program 1 times [2021-11-12 22:25:03,870 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:25:03,870 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [421150863] [2021-11-12 22:25:03,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:25:03,871 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:25:03,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:25:03,965 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 10 proven. 41 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-12 22:25:03,965 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:25:03,966 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [421150863] [2021-11-12 22:25:03,966 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [421150863] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:25:03,966 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1538814047] [2021-11-12 22:25:03,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:25:03,966 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:25:03,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:25:03,967 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:25:03,988 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-12 22:25:04,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:25:04,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 835 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:25:04,147 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:25:04,439 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 70 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-12 22:25:04,439 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:25:04,736 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 56 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-12 22:25:04,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1538814047] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:25:04,736 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-12 22:25:04,737 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 4] imperfect sequences [6] total 8 [2021-11-12 22:25:04,737 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [627945659] [2021-11-12 22:25:04,737 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:25:04,738 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 22:25:04,738 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:25:04,739 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 22:25:04,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-12 22:25:04,739 INFO L87 Difference]: Start difference. First operand 18689 states and 27631 transitions. Second operand has 4 states, 4 states have (on average 30.25) internal successors, (121), 4 states have internal predecessors, (121), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-12 22:25:06,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:25:06,159 INFO L93 Difference]: Finished difference Result 31061 states and 44714 transitions. [2021-11-12 22:25:06,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 22:25:06,160 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 30.25) internal successors, (121), 4 states have internal predecessors, (121), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) Word has length 145 [2021-11-12 22:25:06,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:25:06,252 INFO L225 Difference]: With dead ends: 31061 [2021-11-12 22:25:06,253 INFO L226 Difference]: Without dead ends: 22459 [2021-11-12 22:25:06,278 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 289 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-12 22:25:06,279 INFO L933 BasicCegarLoop]: 3236 mSDtfsCounter, 3446 mSDsluCounter, 3437 mSDsCounter, 0 mSdLazyCounter, 547 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 410.10ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3446 SdHoareTripleChecker+Valid, 6429 SdHoareTripleChecker+Invalid, 552 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 21.72ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 547 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 496.04ms IncrementalHoareTripleChecker+Time [2021-11-12 22:25:06,280 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3446 Valid, 6429 Invalid, 552 Unknown, 0 Unchecked, 21.72ms Time], IncrementalHoareTripleChecker [5 Valid, 547 Invalid, 0 Unknown, 0 Unchecked, 496.04ms Time] [2021-11-12 22:25:06,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22459 states. [2021-11-12 22:25:07,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22459 to 22459. [2021-11-12 22:25:07,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22459 states, 19321 states have (on average 1.4494591377257906) internal successors, (28005), 19387 states have internal predecessors, (28005), 1954 states have call successors, (1954), 1182 states have call predecessors, (1954), 1182 states have return successors, (1954), 1890 states have call predecessors, (1954), 1954 states have call successors, (1954) [2021-11-12 22:25:07,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22459 states to 22459 states and 31913 transitions. [2021-11-12 22:25:07,372 INFO L78 Accepts]: Start accepts. Automaton has 22459 states and 31913 transitions. Word has length 145 [2021-11-12 22:25:07,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:25:07,373 INFO L470 AbstractCegarLoop]: Abstraction has 22459 states and 31913 transitions. [2021-11-12 22:25:07,373 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 30.25) internal successors, (121), 4 states have internal predecessors, (121), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-12 22:25:07,374 INFO L276 IsEmpty]: Start isEmpty. Operand 22459 states and 31913 transitions. [2021-11-12 22:25:07,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-12 22:25:07,422 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:25:07,422 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:25:07,465 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-12 22:25:07,641 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-12 22:25:07,642 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:25:07,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:25:07,642 INFO L85 PathProgramCache]: Analyzing trace with hash 1050922349, now seen corresponding path program 1 times [2021-11-12 22:25:07,642 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:25:07,642 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1008647164] [2021-11-12 22:25:07,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:25:07,643 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:25:07,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:25:07,734 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 10 proven. 42 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-12 22:25:07,734 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:25:07,734 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1008647164] [2021-11-12 22:25:07,735 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1008647164] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:25:07,735 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [58240859] [2021-11-12 22:25:07,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:25:07,735 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:25:07,735 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:25:07,736 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:25:07,757 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-12 22:25:07,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:25:07,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 834 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-12 22:25:07,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:25:08,211 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 87 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-12 22:25:08,212 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:25:08,613 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 37 proven. 19 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-12 22:25:08,613 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [58240859] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 22:25:08,613 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:25:08,613 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6, 4] total 8 [2021-11-12 22:25:08,614 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1500165072] [2021-11-12 22:25:08,614 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:25:08,614 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 22:25:08,615 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:25:08,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 22:25:08,615 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-12 22:25:08,616 INFO L87 Difference]: Start difference. First operand 22459 states and 31913 transitions. Second operand has 4 states, 4 states have (on average 29.0) internal successors, (116), 4 states have internal predecessors, (116), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-12 22:25:10,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:25:10,762 INFO L93 Difference]: Finished difference Result 64557 states and 89721 transitions. [2021-11-12 22:25:10,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 22:25:10,763 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 29.0) internal successors, (116), 4 states have internal predecessors, (116), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 146 [2021-11-12 22:25:10,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:25:10,958 INFO L225 Difference]: With dead ends: 64557 [2021-11-12 22:25:10,959 INFO L226 Difference]: Without dead ends: 43745 [2021-11-12 22:25:11,014 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 292 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-12 22:25:11,015 INFO L933 BasicCegarLoop]: 3357 mSDtfsCounter, 3435 mSDsluCounter, 3754 mSDsCounter, 0 mSdLazyCounter, 575 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 416.65ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3435 SdHoareTripleChecker+Valid, 6825 SdHoareTripleChecker+Invalid, 578 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 19.40ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 575 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 502.12ms IncrementalHoareTripleChecker+Time [2021-11-12 22:25:11,016 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3435 Valid, 6825 Invalid, 578 Unknown, 0 Unchecked, 19.40ms Time], IncrementalHoareTripleChecker [3 Valid, 575 Invalid, 0 Unknown, 0 Unchecked, 502.12ms Time] [2021-11-12 22:25:11,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43745 states. [2021-11-12 22:25:12,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43745 to 43679. [2021-11-12 22:25:12,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43679 states, 37413 states have (on average 1.4130115200598723) internal successors, (52865), 37607 states have internal predecessors, (52865), 3838 states have call successors, (3838), 2362 states have call predecessors, (3838), 2426 states have return successors, (4030), 3710 states have call predecessors, (4030), 3838 states have call successors, (4030) [2021-11-12 22:25:12,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43679 states to 43679 states and 60733 transitions. [2021-11-12 22:25:12,969 INFO L78 Accepts]: Start accepts. Automaton has 43679 states and 60733 transitions. Word has length 146 [2021-11-12 22:25:12,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:25:12,970 INFO L470 AbstractCegarLoop]: Abstraction has 43679 states and 60733 transitions. [2021-11-12 22:25:12,970 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 29.0) internal successors, (116), 4 states have internal predecessors, (116), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-12 22:25:12,971 INFO L276 IsEmpty]: Start isEmpty. Operand 43679 states and 60733 transitions. [2021-11-12 22:25:13,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-12 22:25:13,090 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:25:13,090 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:25:13,132 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-12 22:25:13,313 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:25:13,314 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:25:13,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:25:13,314 INFO L85 PathProgramCache]: Analyzing trace with hash -1304733148, now seen corresponding path program 1 times [2021-11-12 22:25:13,314 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:25:13,314 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1062458119] [2021-11-12 22:25:13,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:25:13,315 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:25:13,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:25:13,399 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 43 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-12 22:25:13,400 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:25:13,400 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1062458119] [2021-11-12 22:25:13,400 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1062458119] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:25:13,400 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1759976637] [2021-11-12 22:25:13,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:25:13,401 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:25:13,401 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:25:13,402 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:25:13,421 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-12 22:25:13,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:25:13,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 831 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 22:25:13,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:25:13,894 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-12 22:25:13,895 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:25:14,190 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2021-11-12 22:25:14,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1759976637] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:25:14,191 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-12 22:25:14,191 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [6] total 7 [2021-11-12 22:25:14,191 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706462356] [2021-11-12 22:25:14,192 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:25:14,192 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:25:14,193 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:25:14,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:25:14,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:25:14,193 INFO L87 Difference]: Start difference. First operand 43679 states and 60733 transitions. Second operand has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 3 states have internal predecessors, (110), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2021-11-12 22:25:16,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:25:16,677 INFO L93 Difference]: Finished difference Result 101577 states and 142240 transitions. [2021-11-12 22:25:16,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:25:16,678 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 3 states have internal predecessors, (110), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 146 [2021-11-12 22:25:16,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:25:16,938 INFO L225 Difference]: With dead ends: 101577 [2021-11-12 22:25:16,938 INFO L226 Difference]: Without dead ends: 59545 [2021-11-12 22:25:17,018 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 293 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:25:17,019 INFO L933 BasicCegarLoop]: 3225 mSDtfsCounter, 75 mSDsluCounter, 3434 mSDsCounter, 0 mSdLazyCounter, 489 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 484.70ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 6422 SdHoareTripleChecker+Invalid, 491 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.12ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 489 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 551.02ms IncrementalHoareTripleChecker+Time [2021-11-12 22:25:17,020 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 6422 Invalid, 491 Unknown, 0 Unchecked, 7.12ms Time], IncrementalHoareTripleChecker [2 Valid, 489 Invalid, 0 Unknown, 0 Unchecked, 551.02ms Time] [2021-11-12 22:25:17,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59545 states. [2021-11-12 22:25:19,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59545 to 49227. [2021-11-12 22:25:19,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49227 states, 42571 states have (on average 1.438890324399239) internal successors, (61255), 42767 states have internal predecessors, (61255), 4033 states have call successors, (4033), 2557 states have call predecessors, (4033), 2621 states have return successors, (4225), 3903 states have call predecessors, (4225), 4033 states have call successors, (4225) [2021-11-12 22:25:19,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49227 states to 49227 states and 69513 transitions. [2021-11-12 22:25:19,240 INFO L78 Accepts]: Start accepts. Automaton has 49227 states and 69513 transitions. Word has length 146 [2021-11-12 22:25:19,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:25:19,241 INFO L470 AbstractCegarLoop]: Abstraction has 49227 states and 69513 transitions. [2021-11-12 22:25:19,241 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 3 states have internal predecessors, (110), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2021-11-12 22:25:19,241 INFO L276 IsEmpty]: Start isEmpty. Operand 49227 states and 69513 transitions. [2021-11-12 22:25:19,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-12 22:25:19,328 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:25:19,328 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:25:19,372 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-11-12 22:25:19,553 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:25:19,554 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:25:19,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:25:19,554 INFO L85 PathProgramCache]: Analyzing trace with hash 813887363, now seen corresponding path program 1 times [2021-11-12 22:25:19,554 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:25:19,554 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [456598366] [2021-11-12 22:25:19,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:25:19,554 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:25:19,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:25:19,878 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 13 proven. 43 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-12 22:25:19,878 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:25:19,878 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [456598366] [2021-11-12 22:25:19,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [456598366] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:25:19,879 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1339737038] [2021-11-12 22:25:19,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:25:19,879 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:25:19,879 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:25:19,890 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:25:19,920 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-12 22:25:20,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:25:20,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 838 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-12 22:25:20,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:25:20,520 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 60 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-12 22:25:20,520 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:25:21,010 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 13 proven. 43 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-12 22:25:21,010 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1339737038] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 22:25:21,011 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:25:21,011 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 5] total 8 [2021-11-12 22:25:21,011 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107787825] [2021-11-12 22:25:21,011 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:25:21,012 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 22:25:21,012 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:25:21,012 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 22:25:21,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-12 22:25:21,013 INFO L87 Difference]: Start difference. First operand 49227 states and 69513 transitions. Second operand has 6 states, 6 states have (on average 15.333333333333334) internal successors, (92), 6 states have internal predecessors, (92), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 22:25:23,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:25:23,384 INFO L93 Difference]: Finished difference Result 87102 states and 121700 transitions. [2021-11-12 22:25:23,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-12 22:25:23,384 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.333333333333334) internal successors, (92), 6 states have internal predecessors, (92), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 147 [2021-11-12 22:25:23,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:25:23,528 INFO L225 Difference]: With dead ends: 87102 [2021-11-12 22:25:23,529 INFO L226 Difference]: Without dead ends: 39522 [2021-11-12 22:25:23,603 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 294 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=50, Invalid=82, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:25:23,605 INFO L933 BasicCegarLoop]: 3209 mSDtfsCounter, 3710 mSDsluCounter, 6872 mSDsCounter, 0 mSdLazyCounter, 832 mSolverCounterSat, 117 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 589.88ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3725 SdHoareTripleChecker+Valid, 9597 SdHoareTripleChecker+Invalid, 949 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 25.46ms SdHoareTripleChecker+Time, 117 IncrementalHoareTripleChecker+Valid, 832 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 714.02ms IncrementalHoareTripleChecker+Time [2021-11-12 22:25:23,605 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3725 Valid, 9597 Invalid, 949 Unknown, 0 Unchecked, 25.46ms Time], IncrementalHoareTripleChecker [117 Valid, 832 Invalid, 0 Unknown, 0 Unchecked, 714.02ms Time] [2021-11-12 22:25:23,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39522 states. [2021-11-12 22:25:25,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39522 to 38140. [2021-11-12 22:25:25,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38140 states, 33039 states have (on average 1.4396622173794607) internal successors, (47565), 33202 states have internal predecessors, (47565), 3049 states have call successors, (3049), 1922 states have call predecessors, (3049), 2050 states have return successors, (3177), 3016 states have call predecessors, (3177), 3049 states have call successors, (3177) [2021-11-12 22:25:25,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38140 states to 38140 states and 53791 transitions. [2021-11-12 22:25:25,430 INFO L78 Accepts]: Start accepts. Automaton has 38140 states and 53791 transitions. Word has length 147 [2021-11-12 22:25:25,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:25:25,430 INFO L470 AbstractCegarLoop]: Abstraction has 38140 states and 53791 transitions. [2021-11-12 22:25:25,431 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.333333333333334) internal successors, (92), 6 states have internal predecessors, (92), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 22:25:25,431 INFO L276 IsEmpty]: Start isEmpty. Operand 38140 states and 53791 transitions. [2021-11-12 22:25:25,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-11-12 22:25:25,497 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:25:25,498 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:25:25,540 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-12 22:25:25,725 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-12 22:25:25,726 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:25:25,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:25:25,726 INFO L85 PathProgramCache]: Analyzing trace with hash 1680422409, now seen corresponding path program 2 times [2021-11-12 22:25:25,726 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:25:25,726 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [737128916] [2021-11-12 22:25:25,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:25:25,727 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:25:25,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:25:25,817 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 14 proven. 43 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-12 22:25:25,817 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:25:25,818 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [737128916] [2021-11-12 22:25:25,818 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [737128916] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:25:25,818 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2002191418] [2021-11-12 22:25:25,818 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:25:25,818 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:25:25,819 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:25:25,820 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:25:25,841 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-12 22:25:26,007 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-12 22:25:26,007 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:25:26,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 784 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 22:25:26,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:25:26,301 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 75 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-12 22:25:26,301 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:25:26,586 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 39 proven. 20 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-12 22:25:26,587 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2002191418] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 22:25:26,587 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:25:26,587 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6, 4] total 8 [2021-11-12 22:25:26,587 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1366006232] [2021-11-12 22:25:26,587 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:25:26,588 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:25:26,588 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:25:26,588 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:25:26,588 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-12 22:25:26,588 INFO L87 Difference]: Start difference. First operand 38140 states and 53791 transitions. Second operand has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-12 22:25:28,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:25:28,083 INFO L93 Difference]: Finished difference Result 50539 states and 71165 transitions. [2021-11-12 22:25:28,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:25:28,084 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 148 [2021-11-12 22:25:28,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:25:28,185 INFO L225 Difference]: With dead ends: 50539 [2021-11-12 22:25:28,186 INFO L226 Difference]: Without dead ends: 36572 [2021-11-12 22:25:28,220 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 296 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-12 22:25:28,221 INFO L933 BasicCegarLoop]: 3219 mSDtfsCounter, 40 mSDsluCounter, 3433 mSDsCounter, 0 mSdLazyCounter, 493 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 281.42ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 6415 SdHoareTripleChecker+Invalid, 493 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.91ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 493 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 360.29ms IncrementalHoareTripleChecker+Time [2021-11-12 22:25:28,221 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 6415 Invalid, 493 Unknown, 0 Unchecked, 5.91ms Time], IncrementalHoareTripleChecker [0 Valid, 493 Invalid, 0 Unknown, 0 Unchecked, 360.29ms Time] [2021-11-12 22:25:28,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36572 states. [2021-11-12 22:25:29,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36572 to 34460. [2021-11-12 22:25:29,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34460 states, 29743 states have (on average 1.4625626197760817) internal successors, (43501), 29810 states have internal predecessors, (43501), 2921 states have call successors, (2921), 1794 states have call predecessors, (2921), 1794 states have return successors, (2921), 2856 states have call predecessors, (2921), 2921 states have call successors, (2921) [2021-11-12 22:25:29,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34460 states to 34460 states and 49343 transitions. [2021-11-12 22:25:29,886 INFO L78 Accepts]: Start accepts. Automaton has 34460 states and 49343 transitions. Word has length 148 [2021-11-12 22:25:29,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:25:29,886 INFO L470 AbstractCegarLoop]: Abstraction has 34460 states and 49343 transitions. [2021-11-12 22:25:29,886 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 3 states have internal predecessors, (103), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-12 22:25:29,886 INFO L276 IsEmpty]: Start isEmpty. Operand 34460 states and 49343 transitions. [2021-11-12 22:25:29,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-11-12 22:25:29,948 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:25:29,948 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:25:29,977 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-12 22:25:30,157 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-12 22:25:30,158 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:25:30,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:25:30,158 INFO L85 PathProgramCache]: Analyzing trace with hash -1119400770, now seen corresponding path program 1 times [2021-11-12 22:25:30,158 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:25:30,158 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [298715081] [2021-11-12 22:25:30,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:25:30,158 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:25:30,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:25:30,259 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 15 proven. 43 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-12 22:25:30,262 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:25:30,262 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [298715081] [2021-11-12 22:25:30,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [298715081] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:25:30,263 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [738368128] [2021-11-12 22:25:30,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:25:30,263 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:25:30,264 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:25:30,264 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:25:30,269 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-12 22:25:30,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:25:30,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 845 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-12 22:25:30,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:25:30,731 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 64 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-12 22:25:30,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:25:31,186 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 17 proven. 43 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-12 22:25:31,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [738368128] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 22:25:31,186 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:25:31,187 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 5] total 11 [2021-11-12 22:25:31,187 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2029158148] [2021-11-12 22:25:31,187 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:25:31,188 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 22:25:31,188 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:25:31,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 22:25:31,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-12 22:25:31,189 INFO L87 Difference]: Start difference. First operand 34460 states and 49343 transitions. Second operand has 6 states, 6 states have (on average 16.0) internal successors, (96), 6 states have internal predecessors, (96), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 22:25:33,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:25:33,773 INFO L93 Difference]: Finished difference Result 82716 states and 117005 transitions. [2021-11-12 22:25:33,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-12 22:25:33,773 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.0) internal successors, (96), 6 states have internal predecessors, (96), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 148 [2021-11-12 22:25:33,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:25:33,901 INFO L225 Difference]: With dead ends: 82716 [2021-11-12 22:25:33,901 INFO L226 Difference]: Without dead ends: 49954 [2021-11-12 22:25:33,941 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 293 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2021-11-12 22:25:33,942 INFO L933 BasicCegarLoop]: 3200 mSDtfsCounter, 7114 mSDsluCounter, 6762 mSDsCounter, 0 mSdLazyCounter, 777 mSolverCounterSat, 166 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 512.11ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 7129 SdHoareTripleChecker+Valid, 9498 SdHoareTripleChecker+Invalid, 943 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 17.41ms SdHoareTripleChecker+Time, 166 IncrementalHoareTripleChecker+Valid, 777 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 622.01ms IncrementalHoareTripleChecker+Time [2021-11-12 22:25:33,942 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7129 Valid, 9498 Invalid, 943 Unknown, 0 Unchecked, 17.41ms Time], IncrementalHoareTripleChecker [166 Valid, 777 Invalid, 0 Unknown, 0 Unchecked, 622.01ms Time] [2021-11-12 22:25:33,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49954 states. [2021-11-12 22:25:36,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49954 to 49952. [2021-11-12 22:25:36,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49952 states, 42939 states have (on average 1.438529076131256) internal successors, (61769), 43038 states have internal predecessors, (61769), 4325 states have call successors, (4325), 2686 states have call predecessors, (4325), 2686 states have return successors, (4325), 4228 states have call predecessors, (4325), 4325 states have call successors, (4325) [2021-11-12 22:25:36,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49952 states to 49952 states and 70419 transitions. [2021-11-12 22:25:36,445 INFO L78 Accepts]: Start accepts. Automaton has 49952 states and 70419 transitions. Word has length 148 [2021-11-12 22:25:36,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:25:36,446 INFO L470 AbstractCegarLoop]: Abstraction has 49952 states and 70419 transitions. [2021-11-12 22:25:36,446 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.0) internal successors, (96), 6 states have internal predecessors, (96), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 22:25:36,446 INFO L276 IsEmpty]: Start isEmpty. Operand 49952 states and 70419 transitions. [2021-11-12 22:25:36,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2021-11-12 22:25:36,511 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:25:36,511 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:25:36,536 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-12 22:25:36,712 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-12 22:25:36,712 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:25:36,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:25:36,713 INFO L85 PathProgramCache]: Analyzing trace with hash -1347455624, now seen corresponding path program 1 times [2021-11-12 22:25:36,713 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:25:36,713 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1017123743] [2021-11-12 22:25:36,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:25:36,713 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:25:36,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:25:36,798 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 15 proven. 43 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-12 22:25:36,799 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:25:36,799 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1017123743] [2021-11-12 22:25:36,799 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1017123743] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:25:36,799 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1434820810] [2021-11-12 22:25:36,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:25:36,800 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:25:36,800 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:25:36,801 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:25:36,832 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ac0d799-cc5c-4d90-981c-cc4e30ed1ed8/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-12 22:25:36,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:25:36,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 859 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-12 22:25:36,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:25:37,294 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 66 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-12 22:25:37,294 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:25:37,732 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 19 proven. 43 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-12 22:25:37,733 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1434820810] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 22:25:37,734 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:25:37,734 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 5] total 11 [2021-11-12 22:25:37,734 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271350239] [2021-11-12 22:25:37,734 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:25:37,735 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 22:25:37,735 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:25:37,735 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 22:25:37,736 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-12 22:25:37,736 INFO L87 Difference]: Start difference. First operand 49952 states and 70419 transitions. Second operand has 6 states, 6 states have (on average 16.5) internal successors, (99), 6 states have internal predecessors, (99), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9)