./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.06.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.06.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V --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 fee2fbeec3a60e447cd74345d2f8a46dc28fcea89eab2880c2a2ccd5802bfaa0 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:43:24,601 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:43:24,604 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:43:24,658 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:43:24,658 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:43:24,663 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:43:24,665 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:43:24,669 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:43:24,672 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:43:24,679 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:43:24,680 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:43:24,682 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:43:24,682 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:43:24,685 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:43:24,688 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:43:24,697 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:43:24,699 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:43:24,700 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:43:24,703 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:43:24,709 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:43:24,712 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:43:24,713 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:43:24,716 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:43:24,717 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:43:24,729 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:43:24,729 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:43:24,730 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:43:24,732 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:43:24,732 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:43:24,734 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:43:24,734 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:43:24,735 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:43:24,737 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:43:24,738 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:43:24,739 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:43:24,740 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:43:24,740 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:43:24,741 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:43:24,741 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:43:24,742 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:43:24,742 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:43:24,743 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:43:24,784 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:43:24,784 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:43:24,785 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:43:24,785 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:43:24,786 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:43:24,792 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:43:24,792 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:43:24,792 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:43:24,793 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:43:24,793 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:43:24,794 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:43:24,794 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:43:24,794 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:43:24,795 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:43:24,795 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:43:24,795 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:43:24,795 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:43:24,795 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:43:24,796 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:43:24,797 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:43:24,797 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:43:24,797 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:43:24,797 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:43:24,797 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:43:24,798 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:43:24,798 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:43:24,798 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:43:24,798 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:43:24,799 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:43:24,799 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:43:24,799 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:43:24,799 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:43:24,800 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:43:24,800 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:43:24,800 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:43:24,800 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:43:24,801 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:43:24,801 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:43:24,801 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:43:24,801 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:43:24,802 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:43:24,802 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_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> fee2fbeec3a60e447cd74345d2f8a46dc28fcea89eab2880c2a2ccd5802bfaa0 [2021-11-23 02:43:25,072 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:43:25,098 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:43:25,100 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:43:25,102 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:43:25,102 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:43:25,104 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.06.cil-2.c [2021-11-23 02:43:25,170 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/data/3087edc49/5644973c21bb402da384f88c30567d16/FLAG6bf623817 [2021-11-23 02:43:25,648 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:43:25,649 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.06.cil-2.c [2021-11-23 02:43:25,668 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/data/3087edc49/5644973c21bb402da384f88c30567d16/FLAG6bf623817 [2021-11-23 02:43:25,984 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/data/3087edc49/5644973c21bb402da384f88c30567d16 [2021-11-23 02:43:25,986 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:43:25,987 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:43:25,990 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:43:25,991 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:43:25,994 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:43:25,995 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:43:25" (1/1) ... [2021-11-23 02:43:25,996 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@c24e415 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:43:25, skipping insertion in model container [2021-11-23 02:43:25,996 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:43:25" (1/1) ... [2021-11-23 02:43:26,015 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:43:26,094 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:43:26,277 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.06.cil-2.c[913,926] [2021-11-23 02:43:26,318 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.06.cil-2.c[5977,5990] [2021-11-23 02:43:26,389 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:43:26,399 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:43:26,411 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.06.cil-2.c[913,926] [2021-11-23 02:43:26,427 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.06.cil-2.c[5977,5990] [2021-11-23 02:43:26,489 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:43:26,529 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:43:26,530 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:43:26 WrapperNode [2021-11-23 02:43:26,530 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:43:26,537 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:43:26,537 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:43:26,537 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:43:26,545 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:43:26" (1/1) ... [2021-11-23 02:43:26,578 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:43:26" (1/1) ... [2021-11-23 02:43:26,629 INFO L137 Inliner]: procedures = 60, calls = 66, calls flagged for inlining = 35, calls inlined = 35, statements flattened = 707 [2021-11-23 02:43:26,629 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:43:26,630 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:43:26,630 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:43:26,630 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:43:26,637 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:43:26" (1/1) ... [2021-11-23 02:43:26,637 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:43:26" (1/1) ... [2021-11-23 02:43:26,641 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:43:26" (1/1) ... [2021-11-23 02:43:26,642 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:43:26" (1/1) ... [2021-11-23 02:43:26,655 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:43:26" (1/1) ... [2021-11-23 02:43:26,669 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:43:26" (1/1) ... [2021-11-23 02:43:26,673 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:43:26" (1/1) ... [2021-11-23 02:43:26,679 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:43:26,679 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:43:26,680 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:43:26,680 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:43:26,696 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:43:26" (1/1) ... [2021-11-23 02:43:26,710 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:43:26,738 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:43:26,761 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:43:26,791 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:43:26,810 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:43:26,811 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-23 02:43:26,811 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-23 02:43:26,811 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify_threads [2021-11-23 02:43:26,811 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify_threads [2021-11-23 02:43:26,811 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread1 [2021-11-23 02:43:26,811 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread1 [2021-11-23 02:43:26,812 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread2 [2021-11-23 02:43:26,812 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread2 [2021-11-23 02:43:26,812 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events2 [2021-11-23 02:43:26,812 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events2 [2021-11-23 02:43:26,812 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads2 [2021-11-23 02:43:26,812 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads2 [2021-11-23 02:43:26,812 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels2 [2021-11-23 02:43:26,813 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels2 [2021-11-23 02:43:26,813 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:43:26,813 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events2 [2021-11-23 02:43:26,813 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events2 [2021-11-23 02:43:26,813 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:43:26,813 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:43:26,813 INFO L130 BoogieDeclarations]: Found specification of procedure error1 [2021-11-23 02:43:26,814 INFO L138 BoogieDeclarations]: Found implementation of procedure error1 [2021-11-23 02:43:26,987 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:43:26,989 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:43:27,660 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:43:27,983 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:43:27,983 INFO L301 CfgBuilder]: Removed 13 assume(true) statements. [2021-11-23 02:43:27,988 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:43:27 BoogieIcfgContainer [2021-11-23 02:43:27,988 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:43:27,991 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:43:27,992 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:43:27,995 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:43:27,995 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:43:25" (1/3) ... [2021-11-23 02:43:27,996 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@487b7d05 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:43:27, skipping insertion in model container [2021-11-23 02:43:27,996 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:43:26" (2/3) ... [2021-11-23 02:43:27,997 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@487b7d05 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:43:27, skipping insertion in model container [2021-11-23 02:43:27,997 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:43:27" (3/3) ... [2021-11-23 02:43:27,998 INFO L111 eAbstractionObserver]: Analyzing ICFG pc_sfifo_1.cil-2+token_ring.06.cil-2.c [2021-11-23 02:43:28,007 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:43:28,007 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 02:43:28,047 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:43:28,053 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 [2021-11-23 02:43:28,053 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 02:43:28,075 INFO L276 IsEmpty]: Start isEmpty. Operand has 173 states, 135 states have (on average 1.548148148148148) internal successors, (209), 140 states have internal predecessors, (209), 26 states have call successors, (26), 9 states have call predecessors, (26), 9 states have return successors, (26), 25 states have call predecessors, (26), 26 states have call successors, (26) [2021-11-23 02:43:28,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-23 02:43:28,083 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:43:28,083 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] [2021-11-23 02:43:28,084 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:43:28,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:43:28,090 INFO L85 PathProgramCache]: Analyzing trace with hash -455419646, now seen corresponding path program 1 times [2021-11-23 02:43:28,099 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:43:28,100 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2062285937] [2021-11-23 02:43:28,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:28,101 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:43:28,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:28,346 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:43:28,347 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:43:28,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2062285937] [2021-11-23 02:43:28,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2062285937] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:43:28,348 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:43:28,348 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:43:28,350 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1421598152] [2021-11-23 02:43:28,351 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:43:28,355 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:43:28,356 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:43:28,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:43:28,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:43:28,406 INFO L87 Difference]: Start difference. First operand has 173 states, 135 states have (on average 1.548148148148148) internal successors, (209), 140 states have internal predecessors, (209), 26 states have call successors, (26), 9 states have call predecessors, (26), 9 states have return successors, (26), 25 states have call predecessors, (26), 26 states have call successors, (26) Second operand has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 02:43:28,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:43:28,661 INFO L93 Difference]: Finished difference Result 379 states and 570 transitions. [2021-11-23 02:43:28,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:43:28,664 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 28 [2021-11-23 02:43:28,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:43:28,687 INFO L225 Difference]: With dead ends: 379 [2021-11-23 02:43:28,687 INFO L226 Difference]: Without dead ends: 206 [2021-11-23 02:43:28,696 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 [2021-11-23 02:43:28,700 INFO L933 BasicCegarLoop]: 223 mSDtfsCounter, 228 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 228 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:43:28,702 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [228 Valid, 278 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:43:28,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2021-11-23 02:43:28,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 202. [2021-11-23 02:43:28,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 161 states have (on average 1.4658385093167703) internal successors, (236), 164 states have internal predecessors, (236), 29 states have call successors, (29), 11 states have call predecessors, (29), 10 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) [2021-11-23 02:43:28,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 292 transitions. [2021-11-23 02:43:28,794 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 292 transitions. Word has length 28 [2021-11-23 02:43:28,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:43:28,795 INFO L470 AbstractCegarLoop]: Abstraction has 202 states and 292 transitions. [2021-11-23 02:43:28,795 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 02:43:28,796 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 292 transitions. [2021-11-23 02:43:28,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-23 02:43:28,800 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:43:28,801 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] [2021-11-23 02:43:28,801 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:43:28,801 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:43:28,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:43:28,805 INFO L85 PathProgramCache]: Analyzing trace with hash 902911387, now seen corresponding path program 1 times [2021-11-23 02:43:28,805 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:43:28,806 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [975388414] [2021-11-23 02:43:28,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:28,806 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:43:28,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:28,910 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:43:28,910 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:43:28,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [975388414] [2021-11-23 02:43:28,910 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [975388414] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:43:28,911 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:43:28,911 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:43:28,911 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105044233] [2021-11-23 02:43:28,911 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:43:28,912 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:43:28,913 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:43:28,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:43:28,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:43:28,914 INFO L87 Difference]: Start difference. First operand 202 states and 292 transitions. Second operand has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 02:43:29,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:43:29,011 INFO L93 Difference]: Finished difference Result 358 states and 509 transitions. [2021-11-23 02:43:29,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:43:29,013 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 29 [2021-11-23 02:43:29,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:43:29,023 INFO L225 Difference]: With dead ends: 358 [2021-11-23 02:43:29,023 INFO L226 Difference]: Without dead ends: 277 [2021-11-23 02:43:29,028 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 [2021-11-23 02:43:29,030 INFO L933 BasicCegarLoop]: 210 mSDtfsCounter, 226 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 226 SdHoareTripleChecker+Valid, 263 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:43:29,031 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [226 Valid, 263 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:43:29,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2021-11-23 02:43:29,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 273. [2021-11-23 02:43:29,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 273 states, 221 states have (on average 1.4343891402714932) internal successors, (317), 224 states have internal predecessors, (317), 36 states have call successors, (36), 15 states have call predecessors, (36), 14 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-23 02:43:29,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 387 transitions. [2021-11-23 02:43:29,075 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 387 transitions. Word has length 29 [2021-11-23 02:43:29,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:43:29,076 INFO L470 AbstractCegarLoop]: Abstraction has 273 states and 387 transitions. [2021-11-23 02:43:29,076 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 02:43:29,076 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 387 transitions. [2021-11-23 02:43:29,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-23 02:43:29,083 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:43:29,084 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] [2021-11-23 02:43:29,084 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 02:43:29,085 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:43:29,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:43:29,086 INFO L85 PathProgramCache]: Analyzing trace with hash -1983091492, now seen corresponding path program 1 times [2021-11-23 02:43:29,086 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:43:29,087 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1806423276] [2021-11-23 02:43:29,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:29,087 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:43:29,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:29,136 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:43:29,137 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:43:29,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1806423276] [2021-11-23 02:43:29,137 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1806423276] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:43:29,137 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:43:29,137 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:43:29,138 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993274234] [2021-11-23 02:43:29,138 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:43:29,138 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:43:29,138 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:43:29,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:43:29,143 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:43:29,144 INFO L87 Difference]: Start difference. First operand 273 states and 387 transitions. Second operand has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 02:43:29,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:43:29,247 INFO L93 Difference]: Finished difference Result 513 states and 715 transitions. [2021-11-23 02:43:29,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:43:29,248 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 30 [2021-11-23 02:43:29,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:43:29,253 INFO L225 Difference]: With dead ends: 513 [2021-11-23 02:43:29,254 INFO L226 Difference]: Without dead ends: 361 [2021-11-23 02:43:29,257 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 [2021-11-23 02:43:29,263 INFO L933 BasicCegarLoop]: 220 mSDtfsCounter, 46 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 411 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:43:29,264 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 411 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:43:29,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 361 states. [2021-11-23 02:43:29,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 361 to 347. [2021-11-23 02:43:29,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 347 states, 284 states have (on average 1.4154929577464788) internal successors, (402), 289 states have internal predecessors, (402), 42 states have call successors, (42), 20 states have call predecessors, (42), 19 states have return successors, (40), 38 states have call predecessors, (40), 40 states have call successors, (40) [2021-11-23 02:43:29,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 347 states to 347 states and 484 transitions. [2021-11-23 02:43:29,302 INFO L78 Accepts]: Start accepts. Automaton has 347 states and 484 transitions. Word has length 30 [2021-11-23 02:43:29,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:43:29,303 INFO L470 AbstractCegarLoop]: Abstraction has 347 states and 484 transitions. [2021-11-23 02:43:29,303 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 02:43:29,303 INFO L276 IsEmpty]: Start isEmpty. Operand 347 states and 484 transitions. [2021-11-23 02:43:29,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 02:43:29,307 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:43:29,307 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 02:43:29,308 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 02:43:29,308 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:43:29,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:43:29,308 INFO L85 PathProgramCache]: Analyzing trace with hash 732093807, now seen corresponding path program 1 times [2021-11-23 02:43:29,309 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:43:29,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1599609772] [2021-11-23 02:43:29,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:29,309 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:43:29,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:29,394 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:43:29,394 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:43:29,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1599609772] [2021-11-23 02:43:29,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1599609772] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:43:29,395 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:43:29,395 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:43:29,395 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [627806895] [2021-11-23 02:43:29,395 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:43:29,396 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:43:29,396 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:43:29,397 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:43:29,397 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:43:29,397 INFO L87 Difference]: Start difference. First operand 347 states and 484 transitions. Second operand has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 02:43:29,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:43:29,527 INFO L93 Difference]: Finished difference Result 510 states and 702 transitions. [2021-11-23 02:43:29,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:43:29,528 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 43 [2021-11-23 02:43:29,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:43:29,531 INFO L225 Difference]: With dead ends: 510 [2021-11-23 02:43:29,532 INFO L226 Difference]: Without dead ends: 352 [2021-11-23 02:43:29,532 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 [2021-11-23 02:43:29,538 INFO L933 BasicCegarLoop]: 239 mSDtfsCounter, 32 mSDsluCounter, 237 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 443 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:43:29,541 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 443 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:43:29,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2021-11-23 02:43:29,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 341. [2021-11-23 02:43:29,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 341 states, 278 states have (on average 1.39568345323741) internal successors, (388), 283 states have internal predecessors, (388), 42 states have call successors, (42), 20 states have call predecessors, (42), 19 states have return successors, (40), 38 states have call predecessors, (40), 40 states have call successors, (40) [2021-11-23 02:43:29,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 341 states and 470 transitions. [2021-11-23 02:43:29,568 INFO L78 Accepts]: Start accepts. Automaton has 341 states and 470 transitions. Word has length 43 [2021-11-23 02:43:29,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:43:29,568 INFO L470 AbstractCegarLoop]: Abstraction has 341 states and 470 transitions. [2021-11-23 02:43:29,569 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 02:43:29,569 INFO L276 IsEmpty]: Start isEmpty. Operand 341 states and 470 transitions. [2021-11-23 02:43:29,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-23 02:43:29,573 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:43:29,573 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 02:43:29,573 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 02:43:29,574 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:43:29,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:43:29,574 INFO L85 PathProgramCache]: Analyzing trace with hash -637766533, now seen corresponding path program 1 times [2021-11-23 02:43:29,574 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:43:29,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1333884422] [2021-11-23 02:43:29,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:29,575 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:43:29,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:29,618 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 02:43:29,618 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:43:29,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1333884422] [2021-11-23 02:43:29,619 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1333884422] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:43:29,619 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:43:29,619 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:43:29,619 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1270688385] [2021-11-23 02:43:29,619 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:43:29,620 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:43:29,620 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:43:29,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:43:29,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:43:29,621 INFO L87 Difference]: Start difference. First operand 341 states and 470 transitions. Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-23 02:43:29,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:43:29,731 INFO L93 Difference]: Finished difference Result 590 states and 794 transitions. [2021-11-23 02:43:29,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:43:29,732 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 46 [2021-11-23 02:43:29,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:43:29,735 INFO L225 Difference]: With dead ends: 590 [2021-11-23 02:43:29,735 INFO L226 Difference]: Without dead ends: 387 [2021-11-23 02:43:29,736 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 [2021-11-23 02:43:29,737 INFO L933 BasicCegarLoop]: 209 mSDtfsCounter, 212 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 261 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:43:29,738 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [212 Valid, 261 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:43:29,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2021-11-23 02:43:29,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 387. [2021-11-23 02:43:29,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 387 states, 317 states have (on average 1.359621451104101) internal successors, (431), 322 states have internal predecessors, (431), 46 states have call successors, (46), 23 states have call predecessors, (46), 22 states have return successors, (44), 42 states have call predecessors, (44), 44 states have call successors, (44) [2021-11-23 02:43:29,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 387 states to 387 states and 521 transitions. [2021-11-23 02:43:29,768 INFO L78 Accepts]: Start accepts. Automaton has 387 states and 521 transitions. Word has length 46 [2021-11-23 02:43:29,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:43:29,769 INFO L470 AbstractCegarLoop]: Abstraction has 387 states and 521 transitions. [2021-11-23 02:43:29,769 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-23 02:43:29,769 INFO L276 IsEmpty]: Start isEmpty. Operand 387 states and 521 transitions. [2021-11-23 02:43:29,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 02:43:29,771 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:43:29,771 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 02:43:29,771 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 02:43:29,772 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:43:29,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:43:29,772 INFO L85 PathProgramCache]: Analyzing trace with hash 1190874642, now seen corresponding path program 1 times [2021-11-23 02:43:29,773 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:43:29,773 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [144779210] [2021-11-23 02:43:29,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:29,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:43:29,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:29,865 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 02:43:29,865 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:43:29,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [144779210] [2021-11-23 02:43:29,866 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [144779210] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:43:29,866 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:43:29,866 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:43:29,866 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [788616224] [2021-11-23 02:43:29,867 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:43:29,867 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:43:29,867 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:43:29,868 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:43:29,868 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:43:29,868 INFO L87 Difference]: Start difference. First operand 387 states and 521 transitions. Second operand has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 02:43:30,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:43:30,047 INFO L93 Difference]: Finished difference Result 427 states and 568 transitions. [2021-11-23 02:43:30,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:43:30,047 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 47 [2021-11-23 02:43:30,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:43:30,052 INFO L225 Difference]: With dead ends: 427 [2021-11-23 02:43:30,052 INFO L226 Difference]: Without dead ends: 424 [2021-11-23 02:43:30,053 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:43:30,054 INFO L933 BasicCegarLoop]: 218 mSDtfsCounter, 392 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 392 SdHoareTripleChecker+Valid, 259 SdHoareTripleChecker+Invalid, 149 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:43:30,054 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [392 Valid, 259 Invalid, 149 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:43:30,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2021-11-23 02:43:30,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 386. [2021-11-23 02:43:30,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 386 states, 317 states have (on average 1.3533123028391167) internal successors, (429), 321 states have internal predecessors, (429), 45 states have call successors, (45), 23 states have call predecessors, (45), 22 states have return successors, (44), 42 states have call predecessors, (44), 44 states have call successors, (44) [2021-11-23 02:43:30,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 386 states to 386 states and 518 transitions. [2021-11-23 02:43:30,088 INFO L78 Accepts]: Start accepts. Automaton has 386 states and 518 transitions. Word has length 47 [2021-11-23 02:43:30,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:43:30,088 INFO L470 AbstractCegarLoop]: Abstraction has 386 states and 518 transitions. [2021-11-23 02:43:30,089 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 02:43:30,089 INFO L276 IsEmpty]: Start isEmpty. Operand 386 states and 518 transitions. [2021-11-23 02:43:30,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-23 02:43:30,091 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:43:30,091 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] [2021-11-23 02:43:30,105 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 02:43:30,105 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:43:30,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:43:30,106 INFO L85 PathProgramCache]: Analyzing trace with hash 1670102418, now seen corresponding path program 1 times [2021-11-23 02:43:30,106 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:43:30,106 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1182621259] [2021-11-23 02:43:30,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:30,106 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:43:30,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:30,171 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:43:30,171 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:43:30,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1182621259] [2021-11-23 02:43:30,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1182621259] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:43:30,172 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:43:30,172 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:43:30,172 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311591478] [2021-11-23 02:43:30,172 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:43:30,172 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:43:30,173 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:43:30,173 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:43:30,173 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:43:30,173 INFO L87 Difference]: Start difference. First operand 386 states and 518 transitions. Second operand has 5 states, 5 states have (on average 7.8) internal successors, (39), 5 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) [2021-11-23 02:43:30,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:43:30,792 INFO L93 Difference]: Finished difference Result 934 states and 1395 transitions. [2021-11-23 02:43:30,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:43:30,792 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.8) internal successors, (39), 5 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 [2021-11-23 02:43:30,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:43:30,801 INFO L225 Difference]: With dead ends: 934 [2021-11-23 02:43:30,801 INFO L226 Difference]: Without dead ends: 819 [2021-11-23 02:43:30,802 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:43:30,803 INFO L933 BasicCegarLoop]: 383 mSDtfsCounter, 875 mSDsluCounter, 618 mSDsCounter, 0 mSdLazyCounter, 438 mSolverCounterSat, 198 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 886 SdHoareTripleChecker+Valid, 886 SdHoareTripleChecker+Invalid, 636 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 198 IncrementalHoareTripleChecker+Valid, 438 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:43:30,803 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [886 Valid, 886 Invalid, 636 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [198 Valid, 438 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:43:30,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 819 states. [2021-11-23 02:43:30,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 819 to 808. [2021-11-23 02:43:30,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 808 states, 654 states have (on average 1.4174311926605505) internal successors, (927), 661 states have internal predecessors, (927), 106 states have call successors, (106), 47 states have call predecessors, (106), 46 states have return successors, (143), 100 states have call predecessors, (143), 105 states have call successors, (143) [2021-11-23 02:43:30,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 808 states to 808 states and 1176 transitions. [2021-11-23 02:43:30,900 INFO L78 Accepts]: Start accepts. Automaton has 808 states and 1176 transitions. Word has length 49 [2021-11-23 02:43:30,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:43:30,900 INFO L470 AbstractCegarLoop]: Abstraction has 808 states and 1176 transitions. [2021-11-23 02:43:30,900 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.8) internal successors, (39), 5 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) [2021-11-23 02:43:30,901 INFO L276 IsEmpty]: Start isEmpty. Operand 808 states and 1176 transitions. [2021-11-23 02:43:30,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-23 02:43:30,902 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:43:30,902 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 02:43:30,902 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 02:43:30,903 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:43:30,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:43:30,903 INFO L85 PathProgramCache]: Analyzing trace with hash -1738544674, now seen corresponding path program 1 times [2021-11-23 02:43:30,903 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:43:30,904 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [647920725] [2021-11-23 02:43:30,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:30,904 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:43:30,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:30,994 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 02:43:30,995 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:43:30,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [647920725] [2021-11-23 02:43:30,995 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [647920725] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:43:30,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [957674020] [2021-11-23 02:43:30,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:30,996 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:43:30,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:43:31,004 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:43:31,012 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:43:31,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:31,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 02:43:31,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:43:31,700 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:43:31,700 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:43:31,903 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 02:43:31,904 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [957674020] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:43:31,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1405716720] [2021-11-23 02:43:31,926 INFO L159 IcfgInterpreter]: Started Sifa with 40 locations of interest [2021-11-23 02:43:31,926 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:43:31,931 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:43:31,937 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:43:31,937 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:43:36,113 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 125 for LOIs [2021-11-23 02:43:36,134 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 140 for LOIs [2021-11-23 02:43:36,163 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify_threads with input of size 296 for LOIs [2021-11-23 02:43:38,116 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:43:56,512 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9793#(and (= ~T6_E~0 2) (= ~t6_i~0 0) (= ~t5_i~0 0) (= 0 ~t5_pc~0) (= ~E_4~0 2) (= ~t1_pc~0 0) (= ~T4_E~0 2) (= 0 ~t4_st~0) (= ~T1_E~0 2) (= ~T5_E~0 2) (= ~m_st~0 0) (= ~E_5~0 2) (= ~q_free~0 1) (<= 0 ~p_num_write~0) (= ~T2_E~0 2) (= 1 ~c_dr_i~0) (= 0 ~t6_pc~0) (= 0 ~t5_st~0) (= ~E_3~0 2) (= 0 ~t3_pc~0) (= 0 ~t6_st~0) (= ~t2_i~0 0) (= ~E_6~0 2) (= ~t4_i~0 0) (= ~t1_st~0 0) (= ~c_num_read~0 1) (<= ~p_num_write~0 1) (= ~m_i~0 0) (not (= ~c_num_read~0 ~p_num_write~0)) (<= 0 (+ ~q_buf_0~0 2147483648)) (= ~p_dw_pc~0 1) (= ~q_write_ev~0 2) (= ~E_2~0 2) (= ~p_dw_st~0 0) (= ~c_last_read~0 ~q_buf_0~0) (= ~T3_E~0 2) (= ~local~0 0) (= ~t3_i~0 0) (= ~token~0 0) (= ~q_read_ev~0 2) (= ~c_dr_pc~0 0) (= ~m_pc~0 0) (= ~p_dw_i~0 1) (= 0 ~t2_pc~0) (= |#NULL.offset| 0) (= ~c_last_read~0 ~p_last_write~0) (<= ~p_last_write~0 2147483647) (= ~E_M~0 2) (= ~a_t~0 0) (= 0 ~t2_st~0) (= 0 ~t4_pc~0) (= ~E_1~0 2) (= 0 ~t3_st~0) (= ~M_E~0 2) (<= 0 |#StackHeapBarrier|) (= ~t1_i~0 0) (= |#NULL.base| 0))' at error location [2021-11-23 02:43:56,512 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:43:56,516 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:43:56,516 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 4] total 7 [2021-11-23 02:43:56,516 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633086337] [2021-11-23 02:43:56,516 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:43:56,517 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:43:56,517 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:43:56,517 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:43:56,521 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=1072, Unknown=0, NotChecked=0, Total=1190 [2021-11-23 02:43:56,521 INFO L87 Difference]: Start difference. First operand 808 states and 1176 transitions. Second operand has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 6 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-23 02:43:56,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:43:56,854 INFO L93 Difference]: Finished difference Result 1251 states and 1744 transitions. [2021-11-23 02:43:56,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:43:56,854 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 6 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 48 [2021-11-23 02:43:56,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:43:56,863 INFO L225 Difference]: With dead ends: 1251 [2021-11-23 02:43:56,863 INFO L226 Difference]: Without dead ends: 1248 [2021-11-23 02:43:56,864 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 109 SyntacticMatches, 5 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 18.4s TimeCoverageRelationStatistics Valid=118, Invalid=1072, Unknown=0, NotChecked=0, Total=1190 [2021-11-23 02:43:56,865 INFO L933 BasicCegarLoop]: 272 mSDtfsCounter, 397 mSDsluCounter, 604 mSDsCounter, 0 mSdLazyCounter, 304 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 397 SdHoareTripleChecker+Valid, 779 SdHoareTripleChecker+Invalid, 316 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 304 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:43:56,865 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [397 Valid, 779 Invalid, 316 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 304 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:43:56,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1248 states. [2021-11-23 02:43:56,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1248 to 1017. [2021-11-23 02:43:56,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1017 states, 831 states have (on average 1.3959085439229844) internal successors, (1160), 840 states have internal predecessors, (1160), 125 states have call successors, (125), 60 states have call predecessors, (125), 59 states have return successors, (162), 117 states have call predecessors, (162), 124 states have call successors, (162) [2021-11-23 02:43:56,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1017 states to 1017 states and 1447 transitions. [2021-11-23 02:43:56,936 INFO L78 Accepts]: Start accepts. Automaton has 1017 states and 1447 transitions. Word has length 48 [2021-11-23 02:43:56,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:43:56,936 INFO L470 AbstractCegarLoop]: Abstraction has 1017 states and 1447 transitions. [2021-11-23 02:43:56,936 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 6 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-23 02:43:56,937 INFO L276 IsEmpty]: Start isEmpty. Operand 1017 states and 1447 transitions. [2021-11-23 02:43:56,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 02:43:56,939 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:43:56,939 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 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] [2021-11-23 02:43:56,978 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:43:57,168 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-23 02:43:57,168 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:43:57,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:43:57,168 INFO L85 PathProgramCache]: Analyzing trace with hash -2056894165, now seen corresponding path program 2 times [2021-11-23 02:43:57,169 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:43:57,169 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2022689217] [2021-11-23 02:43:57,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:57,169 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:43:57,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:57,207 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 02:43:57,207 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:43:57,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2022689217] [2021-11-23 02:43:57,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2022689217] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:43:57,208 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:43:57,208 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:43:57,208 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1598035637] [2021-11-23 02:43:57,208 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:43:57,208 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:43:57,209 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:43:57,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:43:57,209 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:43:57,209 INFO L87 Difference]: Start difference. First operand 1017 states and 1447 transitions. Second operand has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-23 02:43:57,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:43:57,311 INFO L93 Difference]: Finished difference Result 1347 states and 1880 transitions. [2021-11-23 02:43:57,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:43:57,312 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 61 [2021-11-23 02:43:57,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:43:57,318 INFO L225 Difference]: With dead ends: 1347 [2021-11-23 02:43:57,319 INFO L226 Difference]: Without dead ends: 959 [2021-11-23 02:43:57,320 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 [2021-11-23 02:43:57,321 INFO L933 BasicCegarLoop]: 229 mSDtfsCounter, 225 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 225 SdHoareTripleChecker+Valid, 274 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:43:57,321 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [225 Valid, 274 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:43:57,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 959 states. [2021-11-23 02:43:57,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 959 to 950. [2021-11-23 02:43:57,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 950 states, 774 states have (on average 1.3940568475452197) internal successors, (1079), 784 states have internal predecessors, (1079), 119 states have call successors, (119), 56 states have call predecessors, (119), 55 states have return successors, (156), 110 states have call predecessors, (156), 118 states have call successors, (156) [2021-11-23 02:43:57,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 950 states to 950 states and 1354 transitions. [2021-11-23 02:43:57,386 INFO L78 Accepts]: Start accepts. Automaton has 950 states and 1354 transitions. Word has length 61 [2021-11-23 02:43:57,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:43:57,386 INFO L470 AbstractCegarLoop]: Abstraction has 950 states and 1354 transitions. [2021-11-23 02:43:57,387 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-23 02:43:57,387 INFO L276 IsEmpty]: Start isEmpty. Operand 950 states and 1354 transitions. [2021-11-23 02:43:57,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-23 02:43:57,389 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:43:57,389 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 02:43:57,390 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-23 02:43:57,390 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:43:57,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:43:57,390 INFO L85 PathProgramCache]: Analyzing trace with hash 2016258702, now seen corresponding path program 1 times [2021-11-23 02:43:57,391 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:43:57,391 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1484944137] [2021-11-23 02:43:57,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:57,391 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:43:57,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:57,442 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 16 proven. 14 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 02:43:57,442 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:43:57,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1484944137] [2021-11-23 02:43:57,442 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1484944137] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:43:57,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [5469307] [2021-11-23 02:43:57,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:57,443 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:43:57,443 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:43:57,444 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:43:57,463 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:43:57,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:57,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 385 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:43:57,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:43:57,652 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:43:57,652 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:43:57,653 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [5469307] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:43:57,653 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:43:57,653 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-23 02:43:57,653 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498082284] [2021-11-23 02:43:57,653 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:43:57,654 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:43:57,654 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:43:57,654 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:43:57,654 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:43:57,655 INFO L87 Difference]: Start difference. First operand 950 states and 1354 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-23 02:43:57,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:43:57,757 INFO L93 Difference]: Finished difference Result 1077 states and 1513 transitions. [2021-11-23 02:43:57,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:43:57,758 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 73 [2021-11-23 02:43:57,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:43:57,765 INFO L225 Difference]: With dead ends: 1077 [2021-11-23 02:43:57,765 INFO L226 Difference]: Without dead ends: 543 [2021-11-23 02:43:57,770 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:43:57,771 INFO L933 BasicCegarLoop]: 221 mSDtfsCounter, 25 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 414 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:43:57,772 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 414 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:43:57,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 543 states. [2021-11-23 02:43:57,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 543 to 543. [2021-11-23 02:43:57,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 543 states, 431 states have (on average 1.4779582366589328) internal successors, (637), 435 states have internal predecessors, (637), 81 states have call successors, (81), 30 states have call predecessors, (81), 30 states have return successors, (119), 78 states have call predecessors, (119), 81 states have call successors, (119) [2021-11-23 02:43:57,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 543 states to 543 states and 837 transitions. [2021-11-23 02:43:57,811 INFO L78 Accepts]: Start accepts. Automaton has 543 states and 837 transitions. Word has length 73 [2021-11-23 02:43:57,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:43:57,812 INFO L470 AbstractCegarLoop]: Abstraction has 543 states and 837 transitions. [2021-11-23 02:43:57,812 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-23 02:43:57,812 INFO L276 IsEmpty]: Start isEmpty. Operand 543 states and 837 transitions. [2021-11-23 02:43:57,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 02:43:57,815 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:43:57,816 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] [2021-11-23 02:43:57,851 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:43:58,031 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-23 02:43:58,032 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:43:58,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:43:58,032 INFO L85 PathProgramCache]: Analyzing trace with hash -446555561, now seen corresponding path program 1 times [2021-11-23 02:43:58,032 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:43:58,032 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1045255843] [2021-11-23 02:43:58,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:58,033 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:43:58,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:58,085 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:43:58,085 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:43:58,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1045255843] [2021-11-23 02:43:58,086 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1045255843] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:43:58,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [853940974] [2021-11-23 02:43:58,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:58,086 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:43:58,086 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:43:58,096 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:43:58,100 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:43:58,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:58,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 632 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:43:58,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:43:58,374 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 02:43:58,374 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:43:58,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [853940974] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:43:58,375 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:43:58,375 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:43:58,375 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690637941] [2021-11-23 02:43:58,375 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:43:58,376 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:43:58,377 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:43:58,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:43:58,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:43:58,378 INFO L87 Difference]: Start difference. First operand 543 states and 837 transitions. Second operand has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 2 states have internal predecessors, (70), 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) [2021-11-23 02:43:58,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:43:58,512 INFO L93 Difference]: Finished difference Result 1601 states and 2539 transitions. [2021-11-23 02:43:58,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:43:58,513 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 2 states have internal predecessors, (70), 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 [2021-11-23 02:43:58,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:43:58,521 INFO L225 Difference]: With dead ends: 1601 [2021-11-23 02:43:58,522 INFO L226 Difference]: Without dead ends: 1064 [2021-11-23 02:43:58,525 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:43:58,525 INFO L933 BasicCegarLoop]: 163 mSDtfsCounter, 142 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 299 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:43:58,526 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [142 Valid, 299 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:43:58,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1064 states. [2021-11-23 02:43:58,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1064 to 1057. [2021-11-23 02:43:58,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1057 states, 843 states have (on average 1.4709371293001186) internal successors, (1240), 850 states have internal predecessors, (1240), 153 states have call successors, (153), 60 states have call predecessors, (153), 60 states have return successors, (225), 147 states have call predecessors, (225), 153 states have call successors, (225) [2021-11-23 02:43:58,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1057 states to 1057 states and 1618 transitions. [2021-11-23 02:43:58,607 INFO L78 Accepts]: Start accepts. Automaton has 1057 states and 1618 transitions. Word has length 94 [2021-11-23 02:43:58,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:43:58,607 INFO L470 AbstractCegarLoop]: Abstraction has 1057 states and 1618 transitions. [2021-11-23 02:43:58,607 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 2 states have internal predecessors, (70), 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) [2021-11-23 02:43:58,608 INFO L276 IsEmpty]: Start isEmpty. Operand 1057 states and 1618 transitions. [2021-11-23 02:43:58,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 02:43:58,617 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:43:58,617 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] [2021-11-23 02:43:58,644 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-23 02:43:58,828 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:43:58,828 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:43:58,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:43:58,828 INFO L85 PathProgramCache]: Analyzing trace with hash 569871735, now seen corresponding path program 1 times [2021-11-23 02:43:58,828 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:43:58,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [189123932] [2021-11-23 02:43:58,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:58,829 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:43:58,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:58,884 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:43:58,884 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:43:58,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [189123932] [2021-11-23 02:43:58,885 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [189123932] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:43:58,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [700824329] [2021-11-23 02:43:58,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:58,885 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:43:58,885 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:43:58,886 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:43:58,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:43:59,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:59,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 626 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:43:59,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:43:59,201 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 02:43:59,201 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:43:59,202 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [700824329] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:43:59,202 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:43:59,202 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:43:59,204 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1706352849] [2021-11-23 02:43:59,204 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:43:59,205 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:43:59,205 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:43:59,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:43:59,206 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:43:59,206 INFO L87 Difference]: Start difference. First operand 1057 states and 1618 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 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) [2021-11-23 02:43:59,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:43:59,385 INFO L93 Difference]: Finished difference Result 3128 states and 4920 transitions. [2021-11-23 02:43:59,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:43:59,385 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 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 [2021-11-23 02:43:59,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:43:59,402 INFO L225 Difference]: With dead ends: 3128 [2021-11-23 02:43:59,402 INFO L226 Difference]: Without dead ends: 2077 [2021-11-23 02:43:59,408 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:43:59,410 INFO L933 BasicCegarLoop]: 160 mSDtfsCounter, 148 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 296 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:43:59,410 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [148 Valid, 296 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:43:59,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2077 states. [2021-11-23 02:43:59,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2077 to 2065. [2021-11-23 02:43:59,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2065 states, 1652 states have (on average 1.4624697336561743) internal successors, (2416), 1665 states have internal predecessors, (2416), 292 states have call successors, (292), 120 states have call predecessors, (292), 120 states have return successors, (428), 280 states have call predecessors, (428), 292 states have call successors, (428) [2021-11-23 02:43:59,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2065 states to 2065 states and 3136 transitions. [2021-11-23 02:43:59,591 INFO L78 Accepts]: Start accepts. Automaton has 2065 states and 3136 transitions. Word has length 94 [2021-11-23 02:43:59,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:43:59,591 INFO L470 AbstractCegarLoop]: Abstraction has 2065 states and 3136 transitions. [2021-11-23 02:43:59,592 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 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) [2021-11-23 02:43:59,592 INFO L276 IsEmpty]: Start isEmpty. Operand 2065 states and 3136 transitions. [2021-11-23 02:43:59,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 02:43:59,596 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:43:59,597 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] [2021-11-23 02:43:59,634 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:43:59,812 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-23 02:43:59,812 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:43:59,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:43:59,812 INFO L85 PathProgramCache]: Analyzing trace with hash -466474857, now seen corresponding path program 1 times [2021-11-23 02:43:59,812 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:43:59,812 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1986899233] [2021-11-23 02:43:59,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:59,813 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:43:59,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:59,876 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:43:59,876 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:43:59,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1986899233] [2021-11-23 02:43:59,877 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1986899233] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:43:59,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [901052623] [2021-11-23 02:43:59,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:59,877 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:43:59,877 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:43:59,892 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:43:59,908 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:44:00,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:44:00,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 620 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:44:00,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:44:00,160 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 02:44:00,161 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:44:00,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [901052623] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:44:00,161 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:44:00,161 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:44:00,161 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1616738932] [2021-11-23 02:44:00,161 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:44:00,162 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:44:00,162 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:44:00,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:44:00,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:44:00,163 INFO L87 Difference]: Start difference. First operand 2065 states and 3136 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) [2021-11-23 02:44:00,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:44:00,464 INFO L93 Difference]: Finished difference Result 6122 states and 9541 transitions. [2021-11-23 02:44:00,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:44:00,465 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 [2021-11-23 02:44:00,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:44:00,501 INFO L225 Difference]: With dead ends: 6122 [2021-11-23 02:44:00,501 INFO L226 Difference]: Without dead ends: 4063 [2021-11-23 02:44:00,513 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:44:00,514 INFO L933 BasicCegarLoop]: 172 mSDtfsCounter, 154 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 154 SdHoareTripleChecker+Valid, 308 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:44:00,514 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [154 Valid, 308 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:44:00,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4063 states. [2021-11-23 02:44:00,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4063 to 4041. [2021-11-23 02:44:00,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4041 states, 3240 states have (on average 1.4530864197530864) internal successors, (4708), 3265 states have internal predecessors, (4708), 560 states have call successors, (560), 240 states have call predecessors, (560), 240 states have return successors, (816), 536 states have call predecessors, (816), 560 states have call successors, (816) [2021-11-23 02:44:00,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4041 states to 4041 states and 6084 transitions. [2021-11-23 02:44:00,794 INFO L78 Accepts]: Start accepts. Automaton has 4041 states and 6084 transitions. Word has length 94 [2021-11-23 02:44:00,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:44:00,795 INFO L470 AbstractCegarLoop]: Abstraction has 4041 states and 6084 transitions. [2021-11-23 02:44:00,795 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) [2021-11-23 02:44:00,795 INFO L276 IsEmpty]: Start isEmpty. Operand 4041 states and 6084 transitions. [2021-11-23 02:44:00,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 02:44:00,802 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:44:00,803 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] [2021-11-23 02:44:00,841 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:44:01,024 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-23 02:44:01,024 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:44:01,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:44:01,024 INFO L85 PathProgramCache]: Analyzing trace with hash -1785467977, now seen corresponding path program 1 times [2021-11-23 02:44:01,024 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:44:01,024 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [722031900] [2021-11-23 02:44:01,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:44:01,025 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:44:01,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:44:01,130 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:44:01,130 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:44:01,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [722031900] [2021-11-23 02:44:01,131 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [722031900] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:44:01,131 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:44:01,131 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:44:01,131 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1596705702] [2021-11-23 02:44:01,131 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:44:01,132 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:44:01,132 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:44:01,133 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:44:01,133 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:44:01,133 INFO L87 Difference]: Start difference. First operand 4041 states and 6084 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) [2021-11-23 02:44:01,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:44:01,461 INFO L93 Difference]: Finished difference Result 8203 states and 12641 transitions. [2021-11-23 02:44:01,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:44:01,463 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 [2021-11-23 02:44:01,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:44:01,505 INFO L225 Difference]: With dead ends: 8203 [2021-11-23 02:44:01,505 INFO L226 Difference]: Without dead ends: 4969 [2021-11-23 02:44:01,521 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 [2021-11-23 02:44:01,521 INFO L933 BasicCegarLoop]: 223 mSDtfsCounter, 74 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 375 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:44:01,522 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 375 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:44:01,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4969 states. [2021-11-23 02:44:01,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4969 to 4601. [2021-11-23 02:44:01,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4601 states, 3768 states have (on average 1.489384288747346) internal successors, (5612), 3793 states have internal predecessors, (5612), 576 states have call successors, (576), 256 states have call predecessors, (576), 256 states have return successors, (832), 552 states have call predecessors, (832), 576 states have call successors, (832) [2021-11-23 02:44:01,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4601 states to 4601 states and 7020 transitions. [2021-11-23 02:44:01,943 INFO L78 Accepts]: Start accepts. Automaton has 4601 states and 7020 transitions. Word has length 94 [2021-11-23 02:44:01,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:44:01,944 INFO L470 AbstractCegarLoop]: Abstraction has 4601 states and 7020 transitions. [2021-11-23 02:44:01,944 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) [2021-11-23 02:44:01,945 INFO L276 IsEmpty]: Start isEmpty. Operand 4601 states and 7020 transitions. [2021-11-23 02:44:01,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-23 02:44:01,964 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:44:01,966 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] [2021-11-23 02:44:01,966 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-23 02:44:01,967 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:44:01,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:44:01,967 INFO L85 PathProgramCache]: Analyzing trace with hash 1758120286, now seen corresponding path program 1 times [2021-11-23 02:44:01,967 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:44:01,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1806085563] [2021-11-23 02:44:01,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:44:01,968 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:44:02,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:44:02,053 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-23 02:44:02,053 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:44:02,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1806085563] [2021-11-23 02:44:02,054 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1806085563] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:44:02,054 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:44:02,054 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:44:02,054 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329853820] [2021-11-23 02:44:02,054 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:44:02,055 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:44:02,055 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:44:02,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:44:02,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:44:02,056 INFO L87 Difference]: Start difference. First operand 4601 states and 7020 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) [2021-11-23 02:44:02,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:44:02,618 INFO L93 Difference]: Finished difference Result 13614 states and 21197 transitions. [2021-11-23 02:44:02,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:44:02,619 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 [2021-11-23 02:44:02,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:44:02,753 INFO L225 Difference]: With dead ends: 13614 [2021-11-23 02:44:02,753 INFO L226 Difference]: Without dead ends: 9019 [2021-11-23 02:44:02,774 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 [2021-11-23 02:44:02,776 INFO L933 BasicCegarLoop]: 162 mSDtfsCounter, 144 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 144 SdHoareTripleChecker+Valid, 298 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:44:02,776 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [144 Valid, 298 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:44:02,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9019 states. [2021-11-23 02:44:03,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9019 to 8961. [2021-11-23 02:44:03,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8961 states, 7340 states have (on average 1.4762942779291552) internal successors, (10836), 7389 states have internal predecessors, (10836), 1108 states have call successors, (1108), 512 states have call predecessors, (1108), 512 states have return successors, (1588), 1060 states have call predecessors, (1588), 1108 states have call successors, (1588) [2021-11-23 02:44:03,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8961 states to 8961 states and 13532 transitions. [2021-11-23 02:44:03,456 INFO L78 Accepts]: Start accepts. Automaton has 8961 states and 13532 transitions. Word has length 126 [2021-11-23 02:44:03,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:44:03,457 INFO L470 AbstractCegarLoop]: Abstraction has 8961 states and 13532 transitions. [2021-11-23 02:44:03,458 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) [2021-11-23 02:44:03,458 INFO L276 IsEmpty]: Start isEmpty. Operand 8961 states and 13532 transitions. [2021-11-23 02:44:03,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-23 02:44:03,487 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:44:03,488 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] [2021-11-23 02:44:03,488 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-23 02:44:03,488 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:44:03,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:44:03,489 INFO L85 PathProgramCache]: Analyzing trace with hash 977928537, now seen corresponding path program 1 times [2021-11-23 02:44:03,489 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:44:03,489 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1255877372] [2021-11-23 02:44:03,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:44:03,489 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:44:03,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:44:03,561 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-23 02:44:03,562 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:44:03,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1255877372] [2021-11-23 02:44:03,562 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1255877372] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:44:03,562 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:44:03,562 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:44:03,563 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252686815] [2021-11-23 02:44:03,563 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:44:03,563 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:44:03,563 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:44:03,564 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:44:03,564 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:44:03,564 INFO L87 Difference]: Start difference. First operand 8961 states and 13532 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) [2021-11-23 02:44:04,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:44:04,722 INFO L93 Difference]: Finished difference Result 26518 states and 40817 transitions. [2021-11-23 02:44:04,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:44:04,723 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 [2021-11-23 02:44:04,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:44:04,830 INFO L225 Difference]: With dead ends: 26518 [2021-11-23 02:44:04,830 INFO L226 Difference]: Without dead ends: 17563 [2021-11-23 02:44:04,883 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 [2021-11-23 02:44:04,884 INFO L933 BasicCegarLoop]: 164 mSDtfsCounter, 146 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 300 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:44:04,884 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [146 Valid, 300 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:44:04,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17563 states. [2021-11-23 02:44:06,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17563 to 17449. [2021-11-23 02:44:06,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17449 states, 14292 states have (on average 1.4623565631122306) internal successors, (20900), 14389 states have internal predecessors, (20900), 2132 states have call successors, (2132), 1024 states have call predecessors, (2132), 1024 states have return successors, (3028), 2036 states have call predecessors, (3028), 2132 states have call successors, (3028) [2021-11-23 02:44:06,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17449 states to 17449 states and 26060 transitions. [2021-11-23 02:44:06,166 INFO L78 Accepts]: Start accepts. Automaton has 17449 states and 26060 transitions. Word has length 126 [2021-11-23 02:44:06,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:44:06,167 INFO L470 AbstractCegarLoop]: Abstraction has 17449 states and 26060 transitions. [2021-11-23 02:44:06,167 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) [2021-11-23 02:44:06,168 INFO L276 IsEmpty]: Start isEmpty. Operand 17449 states and 26060 transitions. [2021-11-23 02:44:06,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-23 02:44:06,243 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:44:06,244 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] [2021-11-23 02:44:06,244 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-23 02:44:06,244 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:44:06,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:44:06,245 INFO L85 PathProgramCache]: Analyzing trace with hash -1775335772, now seen corresponding path program 1 times [2021-11-23 02:44:06,245 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:44:06,245 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [546215886] [2021-11-23 02:44:06,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:44:06,245 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:44:06,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:44:06,331 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-23 02:44:06,331 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:44:06,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [546215886] [2021-11-23 02:44:06,332 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [546215886] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:44:06,332 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:44:06,332 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:44:06,332 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468494208] [2021-11-23 02:44:06,332 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:44:06,333 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:44:06,333 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:44:06,334 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:44:06,334 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:44:06,334 INFO L87 Difference]: Start difference. First operand 17449 states and 26060 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (10), 1 states have call predecessors, (10), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:44:07,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:44:07,917 INFO L93 Difference]: Finished difference Result 45677 states and 69550 transitions. [2021-11-23 02:44:07,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:44:07,918 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (10), 1 states have call predecessors, (10), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 145 [2021-11-23 02:44:07,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:44:08,067 INFO L225 Difference]: With dead ends: 45677 [2021-11-23 02:44:08,067 INFO L226 Difference]: Without dead ends: 28235 [2021-11-23 02:44:08,118 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 [2021-11-23 02:44:08,119 INFO L933 BasicCegarLoop]: 186 mSDtfsCounter, 84 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 336 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:44:08,120 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 336 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:44:08,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28235 states. [2021-11-23 02:44:09,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28235 to 24225. [2021-11-23 02:44:09,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24225 states, 20616 states have (on average 1.5261932479627474) internal successors, (31464), 20714 states have internal predecessors, (31464), 2358 states have call successors, (2358), 1250 states have call predecessors, (2358), 1250 states have return successors, (3254), 2261 states have call predecessors, (3254), 2358 states have call successors, (3254) [2021-11-23 02:44:09,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24225 states to 24225 states and 37076 transitions. [2021-11-23 02:44:09,811 INFO L78 Accepts]: Start accepts. Automaton has 24225 states and 37076 transitions. Word has length 145 [2021-11-23 02:44:09,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:44:09,811 INFO L470 AbstractCegarLoop]: Abstraction has 24225 states and 37076 transitions. [2021-11-23 02:44:09,812 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (10), 1 states have call predecessors, (10), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:44:09,812 INFO L276 IsEmpty]: Start isEmpty. Operand 24225 states and 37076 transitions. [2021-11-23 02:44:09,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-23 02:44:09,936 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:44:09,936 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] [2021-11-23 02:44:09,936 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-23 02:44:09,936 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:44:09,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:44:09,937 INFO L85 PathProgramCache]: Analyzing trace with hash 48964234, now seen corresponding path program 2 times [2021-11-23 02:44:09,937 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:44:09,937 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1507147489] [2021-11-23 02:44:09,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:44:09,938 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:44:09,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:44:10,005 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 20 proven. 6 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-23 02:44:10,005 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:44:10,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1507147489] [2021-11-23 02:44:10,006 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1507147489] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:44:10,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [344917739] [2021-11-23 02:44:10,006 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:44:10,006 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:44:10,007 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:44:10,012 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:44:10,034 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:44:10,153 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 02:44:10,153 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:44:10,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 539 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:44:10,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:44:10,400 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-23 02:44:10,401 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:44:10,401 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [344917739] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:44:10,401 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:44:10,401 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-23 02:44:10,403 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950675051] [2021-11-23 02:44:10,403 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:44:10,403 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:44:10,404 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:44:10,404 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:44:10,404 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:44:10,404 INFO L87 Difference]: Start difference. First operand 24225 states and 37076 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 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) [2021-11-23 02:44:11,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:44:11,818 INFO L93 Difference]: Finished difference Result 43100 states and 65657 transitions. [2021-11-23 02:44:11,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:44:11,819 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 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 [2021-11-23 02:44:11,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:44:11,937 INFO L225 Difference]: With dead ends: 43100 [2021-11-23 02:44:11,937 INFO L226 Difference]: Without dead ends: 28906 [2021-11-23 02:44:11,981 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:44:11,982 INFO L933 BasicCegarLoop]: 168 mSDtfsCounter, 140 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 207 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:44:11,982 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [140 Valid, 207 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:44:12,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28906 states. [2021-11-23 02:44:13,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28906 to 28906. [2021-11-23 02:44:13,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28906 states, 24822 states have (on average 1.4795745709451293) internal successors, (36726), 24920 states have internal predecessors, (36726), 2515 states have call successors, (2515), 1567 states have call predecessors, (2515), 1568 states have return successors, (3537), 2419 states have call predecessors, (3537), 2515 states have call successors, (3537) [2021-11-23 02:44:13,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28906 states to 28906 states and 42778 transitions. [2021-11-23 02:44:13,771 INFO L78 Accepts]: Start accepts. Automaton has 28906 states and 42778 transitions. Word has length 145 [2021-11-23 02:44:13,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:44:13,771 INFO L470 AbstractCegarLoop]: Abstraction has 28906 states and 42778 transitions. [2021-11-23 02:44:13,771 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 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) [2021-11-23 02:44:13,772 INFO L276 IsEmpty]: Start isEmpty. Operand 28906 states and 42778 transitions. [2021-11-23 02:44:13,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-23 02:44:13,825 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:44:13,826 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] [2021-11-23 02:44:13,862 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 02:44:14,039 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-23 02:44:14,040 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:44:14,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:44:14,040 INFO L85 PathProgramCache]: Analyzing trace with hash 1100413323, now seen corresponding path program 1 times [2021-11-23 02:44:14,040 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:44:14,040 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1171585635] [2021-11-23 02:44:14,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:44:14,041 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:44:14,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:44:14,112 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 20 proven. 6 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-23 02:44:14,113 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:44:14,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1171585635] [2021-11-23 02:44:14,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1171585635] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:44:14,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [824362599] [2021-11-23 02:44:14,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:44:14,113 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:44:14,114 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:44:14,114 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:44:14,135 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:44:14,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:44:14,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 822 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:44:14,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:44:14,522 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 77 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 02:44:14,522 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:44:14,523 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [824362599] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:44:14,523 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:44:14,523 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-23 02:44:14,523 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840126140] [2021-11-23 02:44:14,524 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:44:14,526 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:44:14,526 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:44:14,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:44:14,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:44:14,527 INFO L87 Difference]: Start difference. First operand 28906 states and 42778 transitions. Second operand has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 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) [2021-11-23 02:44:16,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:44:16,107 INFO L93 Difference]: Finished difference Result 55515 states and 83060 transitions. [2021-11-23 02:44:16,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:44:16,107 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 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 [2021-11-23 02:44:16,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:44:16,237 INFO L225 Difference]: With dead ends: 55515 [2021-11-23 02:44:16,237 INFO L226 Difference]: Without dead ends: 40793 [2021-11-23 02:44:16,276 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:44:16,277 INFO L933 BasicCegarLoop]: 253 mSDtfsCounter, 111 mSDsluCounter, 179 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 407 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:44:16,277 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [111 Valid, 407 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:44:16,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40793 states. [2021-11-23 02:44:18,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40793 to 35242. [2021-11-23 02:44:18,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35242 states, 30710 states have (on average 1.5131878866818627) internal successors, (46470), 30808 states have internal predecessors, (46470), 2739 states have call successors, (2739), 1791 states have call predecessors, (2739), 1792 states have return successors, (3761), 2643 states have call predecessors, (3761), 2739 states have call successors, (3761) [2021-11-23 02:44:18,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35242 states to 35242 states and 52970 transitions. [2021-11-23 02:44:18,322 INFO L78 Accepts]: Start accepts. Automaton has 35242 states and 52970 transitions. Word has length 145 [2021-11-23 02:44:18,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:44:18,323 INFO L470 AbstractCegarLoop]: Abstraction has 35242 states and 52970 transitions. [2021-11-23 02:44:18,323 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 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) [2021-11-23 02:44:18,323 INFO L276 IsEmpty]: Start isEmpty. Operand 35242 states and 52970 transitions. [2021-11-23 02:44:18,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-23 02:44:18,386 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:44:18,386 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] [2021-11-23 02:44:18,423 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:44:18,599 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:44:18,600 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:44:18,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:44:18,600 INFO L85 PathProgramCache]: Analyzing trace with hash 359085540, now seen corresponding path program 2 times [2021-11-23 02:44:18,600 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:44:18,600 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [986859390] [2021-11-23 02:44:18,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:44:18,601 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:44:18,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:44:18,675 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 43 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-23 02:44:18,675 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:44:18,676 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [986859390] [2021-11-23 02:44:18,676 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [986859390] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:44:18,676 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1459055602] [2021-11-23 02:44:18,676 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:44:18,677 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:44:18,677 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:44:18,678 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:44:18,698 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 02:44:18,819 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 02:44:18,820 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:44:18,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 553 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:44:18,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:44:19,040 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 70 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 02:44:19,041 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:44:19,041 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1459055602] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:44:19,041 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:44:19,041 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 02:44:19,041 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974765354] [2021-11-23 02:44:19,041 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:44:19,042 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:44:19,042 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:44:19,042 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:44:19,043 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:44:19,043 INFO L87 Difference]: Start difference. First operand 35242 states and 52970 transitions. Second operand has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 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) [2021-11-23 02:44:20,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:44:20,982 INFO L93 Difference]: Finished difference Result 70885 states and 108141 transitions. [2021-11-23 02:44:20,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:44:20,983 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 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 145 [2021-11-23 02:44:20,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:44:21,150 INFO L225 Difference]: With dead ends: 70885 [2021-11-23 02:44:21,150 INFO L226 Difference]: Without dead ends: 50228 [2021-11-23 02:44:21,205 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:44:21,206 INFO L933 BasicCegarLoop]: 288 mSDtfsCounter, 158 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 158 SdHoareTripleChecker+Valid, 427 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:44:21,206 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [158 Valid, 427 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:44:21,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50228 states. [2021-11-23 02:44:23,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50228 to 49650. [2021-11-23 02:44:23,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49650 states, 43299 states have (on average 1.5103120164437978) internal successors, (65395), 43429 states have internal predecessors, (65395), 3825 states have call successors, (3825), 2525 states have call predecessors, (3825), 2525 states have return successors, (5770), 3696 states have call predecessors, (5770), 3825 states have call successors, (5770) [2021-11-23 02:44:24,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49650 states to 49650 states and 74990 transitions. [2021-11-23 02:44:24,010 INFO L78 Accepts]: Start accepts. Automaton has 49650 states and 74990 transitions. Word has length 145 [2021-11-23 02:44:24,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:44:24,011 INFO L470 AbstractCegarLoop]: Abstraction has 49650 states and 74990 transitions. [2021-11-23 02:44:24,011 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 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) [2021-11-23 02:44:24,011 INFO L276 IsEmpty]: Start isEmpty. Operand 49650 states and 74990 transitions. [2021-11-23 02:44:24,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-23 02:44:24,079 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:44:24,080 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] [2021-11-23 02:44:24,116 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 02:44:24,299 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:44:24,300 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:44:24,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:44:24,300 INFO L85 PathProgramCache]: Analyzing trace with hash 1516846048, now seen corresponding path program 1 times [2021-11-23 02:44:24,300 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:44:24,300 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [906609915] [2021-11-23 02:44:24,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:44:24,301 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:44:24,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:44:24,404 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 10 proven. 41 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-23 02:44:24,404 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:44:24,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [906609915] [2021-11-23 02:44:24,405 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [906609915] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:44:24,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1105409927] [2021-11-23 02:44:24,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:44:24,405 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:44:24,405 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:44:24,408 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:44:24,427 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 02:44:24,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:44:24,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 831 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:44:24,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:44:24,815 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 83 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:44:24,815 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:44:24,815 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1105409927] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:44:24,815 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:44:24,816 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-11-23 02:44:24,816 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548142864] [2021-11-23 02:44:24,816 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:44:24,816 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:44:24,816 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:44:24,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:44:24,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:44:24,817 INFO L87 Difference]: Start difference. First operand 49650 states and 74990 transitions. Second operand has 4 states, 4 states have (on average 28.0) internal successors, (112), 4 states have internal predecessors, (112), 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) [2021-11-23 02:44:28,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:44:28,987 INFO L93 Difference]: Finished difference Result 149379 states and 226327 transitions. [2021-11-23 02:44:28,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:44:28,987 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 28.0) internal successors, (112), 4 states have internal predecessors, (112), 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 145 [2021-11-23 02:44:28,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:44:29,368 INFO L225 Difference]: With dead ends: 149379 [2021-11-23 02:44:29,368 INFO L226 Difference]: Without dead ends: 99736 [2021-11-23 02:44:29,470 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:44:29,473 INFO L933 BasicCegarLoop]: 301 mSDtfsCounter, 173 mSDsluCounter, 495 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 173 SdHoareTripleChecker+Valid, 721 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:44:29,473 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [173 Valid, 721 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:44:29,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99736 states. [2021-11-23 02:44:34,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99736 to 99272. [2021-11-23 02:44:34,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99272 states, 86475 states have (on average 1.4825440878866725) internal successors, (128203), 86958 states have internal predecessors, (128203), 7528 states have call successors, (7528), 5044 states have call predecessors, (7528), 5268 states have return successors, (14192), 7270 states have call predecessors, (14192), 7528 states have call successors, (14192) [2021-11-23 02:44:34,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99272 states to 99272 states and 149923 transitions. [2021-11-23 02:44:34,500 INFO L78 Accepts]: Start accepts. Automaton has 99272 states and 149923 transitions. Word has length 145 [2021-11-23 02:44:34,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:44:34,501 INFO L470 AbstractCegarLoop]: Abstraction has 99272 states and 149923 transitions. [2021-11-23 02:44:34,501 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 28.0) internal successors, (112), 4 states have internal predecessors, (112), 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) [2021-11-23 02:44:34,501 INFO L276 IsEmpty]: Start isEmpty. Operand 99272 states and 149923 transitions. [2021-11-23 02:44:34,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-23 02:44:34,642 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:44:34,643 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] [2021-11-23 02:44:34,678 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-11-23 02:44:34,855 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:44:34,856 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:44:34,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:44:34,856 INFO L85 PathProgramCache]: Analyzing trace with hash -1871364801, now seen corresponding path program 2 times [2021-11-23 02:44:34,856 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:44:34,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1193456095] [2021-11-23 02:44:34,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:44:34,857 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:44:34,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:44:34,937 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 10 proven. 42 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-23 02:44:34,938 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:44:34,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1193456095] [2021-11-23 02:44:34,938 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1193456095] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:44:34,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1312844386] [2021-11-23 02:44:34,939 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:44:34,939 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:44:34,939 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:44:34,944 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:44:34,969 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f86f9969-ea33-4e18-8e8a-3c5366d95154/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 02:44:35,085 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 02:44:35,085 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:44:35,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 542 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:44:35,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:44:35,292 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 83 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:44:35,292 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:44:35,292 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1312844386] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:44:35,292 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:44:35,293 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 02:44:35,293 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720919397] [2021-11-23 02:44:35,293 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:44:35,293 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:44:35,294 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:44:35,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:44:35,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:44:35,294 INFO L87 Difference]: Start difference. First operand 99272 states and 149923 transitions. Second operand has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 3 states have internal predecessors, (112), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:44:41,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:44:41,208 INFO L93 Difference]: Finished difference Result 198761 states and 310761 transitions. [2021-11-23 02:44:41,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:44:41,210 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 3 states have internal predecessors, (112), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 145 [2021-11-23 02:44:41,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:44:41,637 INFO L225 Difference]: With dead ends: 198761 [2021-11-23 02:44:41,637 INFO L226 Difference]: Without dead ends: 146758 [2021-11-23 02:44:42,069 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:44:42,074 INFO L933 BasicCegarLoop]: 175 mSDtfsCounter, 141 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 141 SdHoareTripleChecker+Valid, 311 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:44:42,074 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [141 Valid, 311 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:44:42,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146758 states.