./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/eca-rers2012/Problem03_label44.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 47ea0209 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem03_label44.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8 --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 37cccb3bf38aef2358990f5bb72c991902624e4b903b7b6aaef89921bb90a94d --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 00:53:09,574 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 00:53:09,576 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 00:53:09,637 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 00:53:09,638 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 00:53:09,643 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 00:53:09,646 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 00:53:09,651 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 00:53:09,654 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 00:53:09,662 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 00:53:09,664 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 00:53:09,666 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 00:53:09,666 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 00:53:09,670 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 00:53:09,673 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 00:53:09,679 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 00:53:09,680 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 00:53:09,681 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 00:53:09,683 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 00:53:09,686 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 00:53:09,691 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 00:53:09,692 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 00:53:09,696 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 00:53:09,697 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 00:53:09,709 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 00:53:09,709 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 00:53:09,710 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 00:53:09,712 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 00:53:09,713 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 00:53:09,715 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 00:53:09,716 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 00:53:09,717 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 00:53:09,720 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 00:53:09,721 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 00:53:09,723 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 00:53:09,723 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 00:53:09,724 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 00:53:09,724 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 00:53:09,724 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 00:53:09,725 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 00:53:09,726 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 00:53:09,727 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 00:53:09,779 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 00:53:09,780 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 00:53:09,780 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 00:53:09,781 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 00:53:09,781 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 00:53:09,781 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 00:53:09,781 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 00:53:09,781 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 00:53:09,781 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 00:53:09,782 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 00:53:09,782 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 00:53:09,782 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 00:53:09,782 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 00:53:09,782 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 00:53:09,783 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 00:53:09,783 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 00:53:09,784 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 00:53:09,784 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 00:53:09,784 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 00:53:09,784 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 00:53:09,784 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 00:53:09,784 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 00:53:09,784 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 00:53:09,785 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 00:53:09,785 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 00:53:09,785 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 00:53:09,785 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 00:53:09,785 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 00:53:09,785 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 00:53:09,785 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 00:53:09,786 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 00:53:09,786 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 00:53:09,786 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 00:53:09,786 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 00:53:09,787 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 00:53:09,787 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 00:53:09,787 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 00:53:09,787 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 00:53:09,787 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 00:53:09,788 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_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 37cccb3bf38aef2358990f5bb72c991902624e4b903b7b6aaef89921bb90a94d [2021-11-07 00:53:10,081 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 00:53:10,110 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 00:53:10,112 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 00:53:10,114 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 00:53:10,115 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 00:53:10,116 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/eca-rers2012/Problem03_label44.c [2021-11-07 00:53:10,194 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/data/3f7a02b7a/312d7083f673452bb6583decf9b3623e/FLAG7e49b843e [2021-11-07 00:53:10,921 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 00:53:10,923 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/sv-benchmarks/c/eca-rers2012/Problem03_label44.c [2021-11-07 00:53:10,947 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/data/3f7a02b7a/312d7083f673452bb6583decf9b3623e/FLAG7e49b843e [2021-11-07 00:53:11,077 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/data/3f7a02b7a/312d7083f673452bb6583decf9b3623e [2021-11-07 00:53:11,083 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 00:53:11,085 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 00:53:11,087 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 00:53:11,088 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 00:53:11,092 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 00:53:11,093 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:53:11" (1/1) ... [2021-11-07 00:53:11,097 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@78c8d487 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:11, skipping insertion in model container [2021-11-07 00:53:11,098 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:53:11" (1/1) ... [2021-11-07 00:53:11,106 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 00:53:11,216 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 00:53:11,954 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/sv-benchmarks/c/eca-rers2012/Problem03_label44.c[58121,58134] [2021-11-07 00:53:11,983 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:53:11,993 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 00:53:12,231 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/sv-benchmarks/c/eca-rers2012/Problem03_label44.c[58121,58134] [2021-11-07 00:53:12,244 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:53:12,265 INFO L208 MainTranslator]: Completed translation [2021-11-07 00:53:12,265 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:12 WrapperNode [2021-11-07 00:53:12,265 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 00:53:12,267 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 00:53:12,267 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 00:53:12,267 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 00:53:12,275 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:12" (1/1) ... [2021-11-07 00:53:12,329 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:12" (1/1) ... [2021-11-07 00:53:12,456 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 00:53:12,457 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 00:53:12,457 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 00:53:12,457 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 00:53:12,466 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:12" (1/1) ... [2021-11-07 00:53:12,467 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:12" (1/1) ... [2021-11-07 00:53:12,474 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:12" (1/1) ... [2021-11-07 00:53:12,475 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:12" (1/1) ... [2021-11-07 00:53:12,527 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:12" (1/1) ... [2021-11-07 00:53:12,541 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:12" (1/1) ... [2021-11-07 00:53:12,561 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:12" (1/1) ... [2021-11-07 00:53:12,577 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 00:53:12,578 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 00:53:12,579 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 00:53:12,579 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 00:53:12,580 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:12" (1/1) ... [2021-11-07 00:53:12,587 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 00:53:12,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 00:53:12,612 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 00:53:12,646 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 00:53:12,662 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-07 00:53:12,662 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 00:53:12,663 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 00:53:12,663 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 00:53:15,730 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 00:53:15,730 INFO L299 CfgBuilder]: Removed 7 assume(true) statements. [2021-11-07 00:53:15,735 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:53:15 BoogieIcfgContainer [2021-11-07 00:53:15,735 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 00:53:15,737 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 00:53:15,738 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 00:53:15,741 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 00:53:15,742 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 12:53:11" (1/3) ... [2021-11-07 00:53:15,743 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@530cf1fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:53:15, skipping insertion in model container [2021-11-07 00:53:15,744 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:53:12" (2/3) ... [2021-11-07 00:53:15,744 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@530cf1fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:53:15, skipping insertion in model container [2021-11-07 00:53:15,744 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:53:15" (3/3) ... [2021-11-07 00:53:15,748 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem03_label44.c [2021-11-07 00:53:15,758 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 00:53:15,758 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-07 00:53:15,848 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 00:53:15,858 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 [2021-11-07 00:53:15,859 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-07 00:53:15,879 INFO L276 IsEmpty]: Start isEmpty. Operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:15,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-07 00:53:15,893 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:15,893 INFO L513 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:53:15,894 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:53:15,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:15,900 INFO L85 PathProgramCache]: Analyzing trace with hash 209345463, now seen corresponding path program 1 times [2021-11-07 00:53:15,910 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:53:15,910 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1928737080] [2021-11-07 00:53:15,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:15,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:53:16,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:16,633 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:53:16,634 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:53:16,634 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1928737080] [2021-11-07 00:53:16,635 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1928737080] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:16,635 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:16,636 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-07 00:53:16,637 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45717689] [2021-11-07 00:53:16,643 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:53:16,643 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:53:16,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:53:16,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:53:16,663 INFO L87 Difference]: Start difference. First operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:17,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:17,856 INFO L93 Difference]: Finished difference Result 440 states and 860 transitions. [2021-11-07 00:53:17,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:53:17,858 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 143 [2021-11-07 00:53:17,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:17,876 INFO L225 Difference]: With dead ends: 440 [2021-11-07 00:53:17,876 INFO L226 Difference]: Without dead ends: 289 [2021-11-07 00:53:17,879 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:53:17,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2021-11-07 00:53:17,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 289. [2021-11-07 00:53:17,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 288 states have (on average 1.8055555555555556) internal successors, (520), 288 states have internal predecessors, (520), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:17,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 520 transitions. [2021-11-07 00:53:17,943 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 520 transitions. Word has length 143 [2021-11-07 00:53:17,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:17,944 INFO L470 AbstractCegarLoop]: Abstraction has 289 states and 520 transitions. [2021-11-07 00:53:17,945 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:17,945 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 520 transitions. [2021-11-07 00:53:17,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-11-07 00:53:17,950 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:17,950 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:53:17,950 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-07 00:53:17,951 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:53:17,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:17,952 INFO L85 PathProgramCache]: Analyzing trace with hash 1322621345, now seen corresponding path program 1 times [2021-11-07 00:53:17,952 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:53:17,952 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [366701445] [2021-11-07 00:53:17,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:17,953 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:53:17,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:18,090 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:53:18,091 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:53:18,091 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [366701445] [2021-11-07 00:53:18,091 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [366701445] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:18,092 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:18,092 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-07 00:53:18,092 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867313978] [2021-11-07 00:53:18,094 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:53:18,094 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:53:18,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:53:18,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:53:18,096 INFO L87 Difference]: Start difference. First operand 289 states and 520 transitions. Second operand has 3 states, 3 states have (on average 49.333333333333336) internal successors, (148), 2 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:18,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:18,920 INFO L93 Difference]: Finished difference Result 865 states and 1558 transitions. [2021-11-07 00:53:18,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:53:18,921 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 49.333333333333336) internal successors, (148), 2 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 148 [2021-11-07 00:53:18,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:18,927 INFO L225 Difference]: With dead ends: 865 [2021-11-07 00:53:18,927 INFO L226 Difference]: Without dead ends: 577 [2021-11-07 00:53:18,930 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:53:18,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 577 states. [2021-11-07 00:53:18,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 577 to 575. [2021-11-07 00:53:18,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 575 states, 574 states have (on average 1.6742160278745644) internal successors, (961), 574 states have internal predecessors, (961), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:18,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 575 states to 575 states and 961 transitions. [2021-11-07 00:53:18,969 INFO L78 Accepts]: Start accepts. Automaton has 575 states and 961 transitions. Word has length 148 [2021-11-07 00:53:18,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:18,969 INFO L470 AbstractCegarLoop]: Abstraction has 575 states and 961 transitions. [2021-11-07 00:53:18,970 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 49.333333333333336) internal successors, (148), 2 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:18,970 INFO L276 IsEmpty]: Start isEmpty. Operand 575 states and 961 transitions. [2021-11-07 00:53:18,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-11-07 00:53:18,977 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:18,978 INFO L513 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:53:18,978 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-07 00:53:18,978 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:53:18,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:18,979 INFO L85 PathProgramCache]: Analyzing trace with hash 1094385750, now seen corresponding path program 1 times [2021-11-07 00:53:18,980 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:53:18,980 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1856422258] [2021-11-07 00:53:18,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:18,981 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:53:19,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:19,097 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:53:19,098 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:53:19,098 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1856422258] [2021-11-07 00:53:19,099 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1856422258] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:19,099 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:19,105 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-07 00:53:19,105 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [199195604] [2021-11-07 00:53:19,106 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:53:19,106 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:53:19,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:53:19,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:53:19,107 INFO L87 Difference]: Start difference. First operand 575 states and 961 transitions. Second operand has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 2 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:19,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:19,917 INFO L93 Difference]: Finished difference Result 1721 states and 2880 transitions. [2021-11-07 00:53:19,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:53:19,918 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 2 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 151 [2021-11-07 00:53:19,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:19,927 INFO L225 Difference]: With dead ends: 1721 [2021-11-07 00:53:19,927 INFO L226 Difference]: Without dead ends: 1147 [2021-11-07 00:53:19,930 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:53:19,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1147 states. [2021-11-07 00:53:19,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1147 to 1147. [2021-11-07 00:53:19,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1147 states, 1146 states have (on average 1.6282722513089005) internal successors, (1866), 1146 states have internal predecessors, (1866), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:19,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1147 states to 1147 states and 1866 transitions. [2021-11-07 00:53:19,991 INFO L78 Accepts]: Start accepts. Automaton has 1147 states and 1866 transitions. Word has length 151 [2021-11-07 00:53:19,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:19,994 INFO L470 AbstractCegarLoop]: Abstraction has 1147 states and 1866 transitions. [2021-11-07 00:53:19,994 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 2 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:19,995 INFO L276 IsEmpty]: Start isEmpty. Operand 1147 states and 1866 transitions. [2021-11-07 00:53:20,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2021-11-07 00:53:20,003 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:20,004 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:53:20,005 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-07 00:53:20,005 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:53:20,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:20,007 INFO L85 PathProgramCache]: Analyzing trace with hash -316852773, now seen corresponding path program 1 times [2021-11-07 00:53:20,008 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:53:20,009 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [146680139] [2021-11-07 00:53:20,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:20,009 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:53:20,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:20,408 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 00:53:20,409 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:53:20,409 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [146680139] [2021-11-07 00:53:20,414 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [146680139] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:20,414 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:20,415 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:53:20,415 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [147773663] [2021-11-07 00:53:20,416 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:53:20,416 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:53:20,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:53:20,418 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:53:20,419 INFO L87 Difference]: Start difference. First operand 1147 states and 1866 transitions. Second operand has 4 states, 4 states have (on average 38.25) internal successors, (153), 3 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:21,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:21,404 INFO L93 Difference]: Finished difference Result 2434 states and 3994 transitions. [2021-11-07 00:53:21,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:53:21,405 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 38.25) internal successors, (153), 3 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 158 [2021-11-07 00:53:21,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:21,414 INFO L225 Difference]: With dead ends: 2434 [2021-11-07 00:53:21,414 INFO L226 Difference]: Without dead ends: 1147 [2021-11-07 00:53:21,417 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:53:21,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1147 states. [2021-11-07 00:53:21,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1147 to 1147. [2021-11-07 00:53:21,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1147 states, 1146 states have (on average 1.4607329842931938) internal successors, (1674), 1146 states have internal predecessors, (1674), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:21,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1147 states to 1147 states and 1674 transitions. [2021-11-07 00:53:21,457 INFO L78 Accepts]: Start accepts. Automaton has 1147 states and 1674 transitions. Word has length 158 [2021-11-07 00:53:21,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:21,458 INFO L470 AbstractCegarLoop]: Abstraction has 1147 states and 1674 transitions. [2021-11-07 00:53:21,458 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 38.25) internal successors, (153), 3 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:21,458 INFO L276 IsEmpty]: Start isEmpty. Operand 1147 states and 1674 transitions. [2021-11-07 00:53:21,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2021-11-07 00:53:21,463 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:21,463 INFO L513 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:53:21,464 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-07 00:53:21,464 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:53:21,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:21,465 INFO L85 PathProgramCache]: Analyzing trace with hash 10687328, now seen corresponding path program 1 times [2021-11-07 00:53:21,465 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:53:21,465 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [739170249] [2021-11-07 00:53:21,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:21,466 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:53:21,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:21,744 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 30 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:53:21,745 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:53:21,745 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [739170249] [2021-11-07 00:53:21,745 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [739170249] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:21,746 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:21,746 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:53:21,746 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [154679552] [2021-11-07 00:53:21,747 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:53:21,747 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:53:21,747 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:53:21,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:53:21,748 INFO L87 Difference]: Start difference. First operand 1147 states and 1674 transitions. Second operand has 4 states, 4 states have (on average 43.5) internal successors, (174), 3 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:22,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:22,917 INFO L93 Difference]: Finished difference Result 3006 states and 4395 transitions. [2021-11-07 00:53:22,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:53:22,918 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 43.5) internal successors, (174), 3 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 174 [2021-11-07 00:53:22,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:22,931 INFO L225 Difference]: With dead ends: 3006 [2021-11-07 00:53:22,931 INFO L226 Difference]: Without dead ends: 1719 [2021-11-07 00:53:22,933 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:53:22,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1719 states. [2021-11-07 00:53:22,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1719 to 1719. [2021-11-07 00:53:22,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1719 states, 1718 states have (on average 1.4365541327124562) internal successors, (2468), 1718 states have internal predecessors, (2468), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:22,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1719 states to 1719 states and 2468 transitions. [2021-11-07 00:53:22,991 INFO L78 Accepts]: Start accepts. Automaton has 1719 states and 2468 transitions. Word has length 174 [2021-11-07 00:53:22,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:22,992 INFO L470 AbstractCegarLoop]: Abstraction has 1719 states and 2468 transitions. [2021-11-07 00:53:22,992 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 43.5) internal successors, (174), 3 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:22,992 INFO L276 IsEmpty]: Start isEmpty. Operand 1719 states and 2468 transitions. [2021-11-07 00:53:22,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2021-11-07 00:53:22,998 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:22,998 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:53:22,998 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-07 00:53:22,999 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:53:22,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:22,999 INFO L85 PathProgramCache]: Analyzing trace with hash -1715219333, now seen corresponding path program 1 times [2021-11-07 00:53:23,000 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:53:23,000 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [614781030] [2021-11-07 00:53:23,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:23,000 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:53:23,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:23,127 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 31 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-07 00:53:23,129 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:53:23,129 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [614781030] [2021-11-07 00:53:23,130 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [614781030] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:23,130 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:23,130 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-07 00:53:23,131 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [356947169] [2021-11-07 00:53:23,131 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:53:23,132 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:53:23,134 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:53:23,136 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:53:23,137 INFO L87 Difference]: Start difference. First operand 1719 states and 2468 transitions. Second operand has 3 states, 3 states have (on average 57.333333333333336) internal successors, (172), 2 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:23,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:23,884 INFO L93 Difference]: Finished difference Result 5155 states and 7402 transitions. [2021-11-07 00:53:23,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:53:23,885 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 57.333333333333336) internal successors, (172), 2 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 176 [2021-11-07 00:53:23,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:23,905 INFO L225 Difference]: With dead ends: 5155 [2021-11-07 00:53:23,906 INFO L226 Difference]: Without dead ends: 3437 [2021-11-07 00:53:23,908 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:53:23,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3437 states. [2021-11-07 00:53:23,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3437 to 3435. [2021-11-07 00:53:24,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3435 states, 3434 states have (on average 1.40768782760629) internal successors, (4834), 3434 states have internal predecessors, (4834), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:24,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3435 states to 3435 states and 4834 transitions. [2021-11-07 00:53:24,016 INFO L78 Accepts]: Start accepts. Automaton has 3435 states and 4834 transitions. Word has length 176 [2021-11-07 00:53:24,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:24,017 INFO L470 AbstractCegarLoop]: Abstraction has 3435 states and 4834 transitions. [2021-11-07 00:53:24,017 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 57.333333333333336) internal successors, (172), 2 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:24,017 INFO L276 IsEmpty]: Start isEmpty. Operand 3435 states and 4834 transitions. [2021-11-07 00:53:24,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2021-11-07 00:53:24,026 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:24,027 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:53:24,027 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-07 00:53:24,027 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:53:24,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:24,028 INFO L85 PathProgramCache]: Analyzing trace with hash 1441036347, now seen corresponding path program 1 times [2021-11-07 00:53:24,028 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:53:24,034 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1864274161] [2021-11-07 00:53:24,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:24,034 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:53:24,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:24,293 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 37 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:53:24,294 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:53:24,294 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1864274161] [2021-11-07 00:53:24,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1864274161] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 00:53:24,295 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [401693414] [2021-11-07 00:53:24,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:24,295 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 00:53:24,296 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 00:53:24,299 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 00:53:24,322 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-07 00:53:24,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:24,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 428 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:53:24,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:53:25,160 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-07 00:53:25,161 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:53:25,814 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-07 00:53:25,815 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [401693414] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:25,815 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2021-11-07 00:53:25,815 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [4] total 6 [2021-11-07 00:53:25,816 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [28762081] [2021-11-07 00:53:25,816 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:53:25,817 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:53:25,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:53:25,818 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:53:25,818 INFO L87 Difference]: Start difference. First operand 3435 states and 4834 transitions. Second operand has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 3 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:26,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:26,561 INFO L93 Difference]: Finished difference Result 7727 states and 10950 transitions. [2021-11-07 00:53:26,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:53:26,562 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 3 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 181 [2021-11-07 00:53:26,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:26,590 INFO L225 Difference]: With dead ends: 7727 [2021-11-07 00:53:26,590 INFO L226 Difference]: Without dead ends: 4293 [2021-11-07 00:53:26,596 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 364 GetRequests, 359 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:53:26,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4293 states. [2021-11-07 00:53:26,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4293 to 4293. [2021-11-07 00:53:26,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4293 states, 4292 states have (on average 1.4051724137931034) internal successors, (6031), 4292 states have internal predecessors, (6031), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:26,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4293 states to 4293 states and 6031 transitions. [2021-11-07 00:53:26,739 INFO L78 Accepts]: Start accepts. Automaton has 4293 states and 6031 transitions. Word has length 181 [2021-11-07 00:53:26,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:26,740 INFO L470 AbstractCegarLoop]: Abstraction has 4293 states and 6031 transitions. [2021-11-07 00:53:26,740 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 3 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:26,740 INFO L276 IsEmpty]: Start isEmpty. Operand 4293 states and 6031 transitions. [2021-11-07 00:53:26,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2021-11-07 00:53:26,750 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:26,751 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:53:26,789 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-07 00:53:26,974 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-07 00:53:26,975 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:53:26,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:26,975 INFO L85 PathProgramCache]: Analyzing trace with hash 1930935373, now seen corresponding path program 1 times [2021-11-07 00:53:26,975 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:53:26,975 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [392608921] [2021-11-07 00:53:26,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:26,976 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:53:27,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:27,220 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 64 proven. 6 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 00:53:27,221 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:53:27,221 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [392608921] [2021-11-07 00:53:27,221 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [392608921] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 00:53:27,221 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1691793509] [2021-11-07 00:53:27,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:27,222 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 00:53:27,222 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 00:53:27,226 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 00:53:27,250 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-07 00:53:27,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:27,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 563 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:53:27,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:53:27,992 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 66 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-07 00:53:27,992 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:53:28,474 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 66 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-07 00:53:28,474 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1691793509] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:28,474 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2021-11-07 00:53:28,475 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [4] total 5 [2021-11-07 00:53:28,475 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235136946] [2021-11-07 00:53:28,476 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:53:28,476 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:53:28,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:53:28,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:53:28,477 INFO L87 Difference]: Start difference. First operand 4293 states and 6031 transitions. Second operand has 3 states, 3 states have (on average 59.666666666666664) internal successors, (179), 2 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:28,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:28,794 INFO L93 Difference]: Finished difference Result 12877 states and 18091 transitions. [2021-11-07 00:53:28,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:53:28,795 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 59.666666666666664) internal successors, (179), 2 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 196 [2021-11-07 00:53:28,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:28,852 INFO L225 Difference]: With dead ends: 12877 [2021-11-07 00:53:28,853 INFO L226 Difference]: Without dead ends: 8585 [2021-11-07 00:53:28,860 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 394 GetRequests, 389 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:53:28,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8585 states. [2021-11-07 00:53:29,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8585 to 8583. [2021-11-07 00:53:29,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8583 states, 8582 states have (on average 1.4006059193661151) internal successors, (12020), 8582 states have internal predecessors, (12020), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:29,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8583 states to 8583 states and 12020 transitions. [2021-11-07 00:53:29,239 INFO L78 Accepts]: Start accepts. Automaton has 8583 states and 12020 transitions. Word has length 196 [2021-11-07 00:53:29,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:29,240 INFO L470 AbstractCegarLoop]: Abstraction has 8583 states and 12020 transitions. [2021-11-07 00:53:29,240 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 59.666666666666664) internal successors, (179), 2 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:29,240 INFO L276 IsEmpty]: Start isEmpty. Operand 8583 states and 12020 transitions. [2021-11-07 00:53:29,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2021-11-07 00:53:29,261 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:29,262 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:53:29,304 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-07 00:53:29,490 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 00:53:29,491 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:53:29,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:29,492 INFO L85 PathProgramCache]: Analyzing trace with hash -1132194896, now seen corresponding path program 1 times [2021-11-07 00:53:29,492 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:53:29,492 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1681314281] [2021-11-07 00:53:29,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:29,492 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:53:29,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:29,734 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 65 proven. 6 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-07 00:53:29,735 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:53:29,735 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1681314281] [2021-11-07 00:53:29,735 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1681314281] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 00:53:29,735 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2145919937] [2021-11-07 00:53:29,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:29,736 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 00:53:29,736 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 00:53:29,737 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 00:53:29,763 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-07 00:53:30,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:30,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 519 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:53:30,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:53:30,750 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-07 00:53:30,751 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:53:31,389 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-07 00:53:31,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2145919937] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:31,390 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2021-11-07 00:53:31,390 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [4] total 6 [2021-11-07 00:53:31,391 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949525466] [2021-11-07 00:53:31,391 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:53:31,392 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:53:31,392 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:53:31,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:53:31,393 INFO L87 Difference]: Start difference. First operand 8583 states and 12020 transitions. Second operand has 3 states, 3 states have (on average 59.333333333333336) internal successors, (178), 3 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:32,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:32,391 INFO L93 Difference]: Finished difference Result 23743 states and 33284 transitions. [2021-11-07 00:53:32,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:53:32,392 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 59.333333333333336) internal successors, (178), 3 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 200 [2021-11-07 00:53:32,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:32,452 INFO L225 Difference]: With dead ends: 23743 [2021-11-07 00:53:32,453 INFO L226 Difference]: Without dead ends: 15161 [2021-11-07 00:53:32,466 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 397 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:53:32,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15161 states. [2021-11-07 00:53:32,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15161 to 15161. [2021-11-07 00:53:32,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15161 states, 15160 states have (on average 1.2450527704485488) internal successors, (18875), 15160 states have internal predecessors, (18875), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:33,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15161 states to 15161 states and 18875 transitions. [2021-11-07 00:53:33,052 INFO L78 Accepts]: Start accepts. Automaton has 15161 states and 18875 transitions. Word has length 200 [2021-11-07 00:53:33,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:33,053 INFO L470 AbstractCegarLoop]: Abstraction has 15161 states and 18875 transitions. [2021-11-07 00:53:33,054 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 59.333333333333336) internal successors, (178), 3 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:33,054 INFO L276 IsEmpty]: Start isEmpty. Operand 15161 states and 18875 transitions. [2021-11-07 00:53:33,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2021-11-07 00:53:33,085 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:33,085 INFO L513 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:53:33,125 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-07 00:53:33,302 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 00:53:33,303 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:53:33,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:33,303 INFO L85 PathProgramCache]: Analyzing trace with hash -445986388, now seen corresponding path program 1 times [2021-11-07 00:53:33,303 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:53:33,303 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1887236493] [2021-11-07 00:53:33,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:33,304 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:53:33,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:33,425 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 58 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:53:33,425 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:53:33,426 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1887236493] [2021-11-07 00:53:33,426 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1887236493] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:33,426 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:33,426 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-07 00:53:33,426 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803136374] [2021-11-07 00:53:33,427 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:53:33,427 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:53:33,428 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:53:33,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:53:33,429 INFO L87 Difference]: Start difference. First operand 15161 states and 18875 transitions. Second operand has 3 states, 3 states have (on average 67.33333333333333) internal successors, (202), 2 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:34,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:34,335 INFO L93 Difference]: Finished difference Result 35183 states and 44610 transitions. [2021-11-07 00:53:34,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:53:34,336 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 67.33333333333333) internal successors, (202), 2 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 202 [2021-11-07 00:53:34,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:34,380 INFO L225 Difference]: With dead ends: 35183 [2021-11-07 00:53:34,380 INFO L226 Difference]: Without dead ends: 20023 [2021-11-07 00:53:34,401 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:53:34,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20023 states. [2021-11-07 00:53:34,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20023 to 20023. [2021-11-07 00:53:34,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20023 states, 20022 states have (on average 1.192188592548197) internal successors, (23870), 20022 states have internal predecessors, (23870), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:34,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20023 states to 20023 states and 23870 transitions. [2021-11-07 00:53:34,920 INFO L78 Accepts]: Start accepts. Automaton has 20023 states and 23870 transitions. Word has length 202 [2021-11-07 00:53:34,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:34,921 INFO L470 AbstractCegarLoop]: Abstraction has 20023 states and 23870 transitions. [2021-11-07 00:53:34,921 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 67.33333333333333) internal successors, (202), 2 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:34,921 INFO L276 IsEmpty]: Start isEmpty. Operand 20023 states and 23870 transitions. [2021-11-07 00:53:34,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2021-11-07 00:53:34,945 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:34,945 INFO L513 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, 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:53:34,945 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-07 00:53:34,946 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:53:34,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:34,946 INFO L85 PathProgramCache]: Analyzing trace with hash -1334409962, now seen corresponding path program 1 times [2021-11-07 00:53:34,946 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:53:34,947 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [546103] [2021-11-07 00:53:34,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:34,948 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:53:35,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:35,066 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 74 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:53:35,066 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:53:35,066 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [546103] [2021-11-07 00:53:35,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [546103] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:35,067 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:35,067 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-07 00:53:35,067 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1457198268] [2021-11-07 00:53:35,068 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:53:35,068 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:53:35,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:53:35,069 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:53:35,069 INFO L87 Difference]: Start difference. First operand 20023 states and 23870 transitions. Second operand has 3 states, 3 states have (on average 72.66666666666667) internal successors, (218), 2 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:35,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:35,974 INFO L93 Difference]: Finished difference Result 47626 states and 56767 transitions. [2021-11-07 00:53:35,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:53:35,975 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 72.66666666666667) internal successors, (218), 2 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 218 [2021-11-07 00:53:35,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:36,041 INFO L225 Difference]: With dead ends: 47626 [2021-11-07 00:53:36,041 INFO L226 Difference]: Without dead ends: 27890 [2021-11-07 00:53:36,067 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:53:36,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27890 states. [2021-11-07 00:53:36,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27890 to 26458. [2021-11-07 00:53:36,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26458 states, 26457 states have (on average 1.1939751294553427) internal successors, (31589), 26457 states have internal predecessors, (31589), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:36,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26458 states to 26458 states and 31589 transitions. [2021-11-07 00:53:36,720 INFO L78 Accepts]: Start accepts. Automaton has 26458 states and 31589 transitions. Word has length 218 [2021-11-07 00:53:36,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:36,721 INFO L470 AbstractCegarLoop]: Abstraction has 26458 states and 31589 transitions. [2021-11-07 00:53:36,721 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 72.66666666666667) internal successors, (218), 2 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:36,721 INFO L276 IsEmpty]: Start isEmpty. Operand 26458 states and 31589 transitions. [2021-11-07 00:53:36,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 240 [2021-11-07 00:53:36,901 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:36,901 INFO L513 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, 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, 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, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:53:36,901 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-07 00:53:36,902 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:53:36,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:36,902 INFO L85 PathProgramCache]: Analyzing trace with hash 189647308, now seen corresponding path program 1 times [2021-11-07 00:53:36,902 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:53:36,903 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1858326534] [2021-11-07 00:53:36,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:36,903 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:53:37,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:37,192 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 95 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:53:37,192 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:53:37,193 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1858326534] [2021-11-07 00:53:37,193 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1858326534] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:37,193 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:37,193 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:53:37,193 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265751846] [2021-11-07 00:53:37,194 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:53:37,194 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:53:37,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:53:37,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:53:37,195 INFO L87 Difference]: Start difference. First operand 26458 states and 31589 transitions. Second operand has 3 states, 3 states have (on average 79.66666666666667) internal successors, (239), 3 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:38,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:38,145 INFO L93 Difference]: Finished difference Result 60494 states and 72126 transitions. [2021-11-07 00:53:38,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:53:38,146 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 79.66666666666667) internal successors, (239), 3 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 239 [2021-11-07 00:53:38,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:38,211 INFO L225 Difference]: With dead ends: 60494 [2021-11-07 00:53:38,211 INFO L226 Difference]: Without dead ends: 34609 [2021-11-07 00:53:38,230 INFO L786 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 [2021-11-07 00:53:38,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34609 states. [2021-11-07 00:53:38,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34609 to 34609. [2021-11-07 00:53:38,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34609 states, 34608 states have (on average 1.1673312528895052) internal successors, (40399), 34608 states have internal predecessors, (40399), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:39,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34609 states to 34609 states and 40399 transitions. [2021-11-07 00:53:39,165 INFO L78 Accepts]: Start accepts. Automaton has 34609 states and 40399 transitions. Word has length 239 [2021-11-07 00:53:39,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:39,166 INFO L470 AbstractCegarLoop]: Abstraction has 34609 states and 40399 transitions. [2021-11-07 00:53:39,166 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 79.66666666666667) internal successors, (239), 3 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:39,166 INFO L276 IsEmpty]: Start isEmpty. Operand 34609 states and 40399 transitions. [2021-11-07 00:53:39,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2021-11-07 00:53:39,202 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:39,202 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 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, 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, 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, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:53:39,203 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-07 00:53:39,203 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:53:39,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:39,204 INFO L85 PathProgramCache]: Analyzing trace with hash 1006210687, now seen corresponding path program 1 times [2021-11-07 00:53:39,204 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:53:39,204 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1066562822] [2021-11-07 00:53:39,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:39,204 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:53:39,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:39,351 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 117 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 00:53:39,352 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:53:39,352 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1066562822] [2021-11-07 00:53:39,352 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1066562822] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 00:53:39,352 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [903364621] [2021-11-07 00:53:39,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:39,353 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 00:53:39,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 00:53:39,354 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 00:53:39,381 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-07 00:53:39,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:39,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 540 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:53:39,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:53:40,684 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 112 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-07 00:53:40,685 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:53:41,292 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 112 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-07 00:53:41,293 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [903364621] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:41,293 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2021-11-07 00:53:41,293 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [3] total 5 [2021-11-07 00:53:41,296 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292004752] [2021-11-07 00:53:41,297 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:53:41,297 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:53:41,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:53:41,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-07 00:53:41,299 INFO L87 Difference]: Start difference. First operand 34609 states and 40399 transitions. Second operand has 3 states, 3 states have (on average 80.33333333333333) internal successors, (241), 3 states have internal predecessors, (241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:42,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:42,205 INFO L93 Difference]: Finished difference Result 72363 states and 85442 transitions. [2021-11-07 00:53:42,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:53:42,206 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 80.33333333333333) internal successors, (241), 3 states have internal predecessors, (241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 258 [2021-11-07 00:53:42,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:42,267 INFO L225 Difference]: With dead ends: 72363 [2021-11-07 00:53:42,267 INFO L226 Difference]: Without dead ends: 38327 [2021-11-07 00:53:42,284 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 513 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-07 00:53:42,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38327 states. [2021-11-07 00:53:42,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38327 to 38041. [2021-11-07 00:53:42,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38041 states, 38040 states have (on average 1.1827549947423766) internal successors, (44992), 38040 states have internal predecessors, (44992), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:43,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38041 states to 38041 states and 44992 transitions. [2021-11-07 00:53:43,012 INFO L78 Accepts]: Start accepts. Automaton has 38041 states and 44992 transitions. Word has length 258 [2021-11-07 00:53:43,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:43,012 INFO L470 AbstractCegarLoop]: Abstraction has 38041 states and 44992 transitions. [2021-11-07 00:53:43,013 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 80.33333333333333) internal successors, (241), 3 states have internal predecessors, (241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:43,013 INFO L276 IsEmpty]: Start isEmpty. Operand 38041 states and 44992 transitions. [2021-11-07 00:53:43,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 293 [2021-11-07 00:53:43,048 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:43,048 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 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, 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:53:43,088 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-07 00:53:43,274 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-07 00:53:43,275 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:53:43,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:43,275 INFO L85 PathProgramCache]: Analyzing trace with hash 1186316352, now seen corresponding path program 1 times [2021-11-07 00:53:43,275 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:53:43,275 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1247649943] [2021-11-07 00:53:43,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:43,276 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:53:43,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:43,585 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 184 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-07 00:53:43,585 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:53:43,586 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1247649943] [2021-11-07 00:53:43,588 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1247649943] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:43,588 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:53:43,588 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:53:43,588 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1279390070] [2021-11-07 00:53:43,589 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:53:43,589 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:53:43,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:53:43,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:53:43,591 INFO L87 Difference]: Start difference. First operand 38041 states and 44992 transitions. Second operand has 3 states, 3 states have (on average 86.33333333333333) internal successors, (259), 3 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:44,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:44,693 INFO L93 Difference]: Finished difference Result 81944 states and 97524 transitions. [2021-11-07 00:53:44,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:53:44,693 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 86.33333333333333) internal successors, (259), 3 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 292 [2021-11-07 00:53:44,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:44,789 INFO L225 Difference]: With dead ends: 81944 [2021-11-07 00:53:44,789 INFO L226 Difference]: Without dead ends: 44476 [2021-11-07 00:53:44,817 INFO L786 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 [2021-11-07 00:53:44,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44476 states. [2021-11-07 00:53:45,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44476 to 43332. [2021-11-07 00:53:45,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43332 states, 43331 states have (on average 1.168724469779142) internal successors, (50642), 43331 states have internal predecessors, (50642), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:45,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43332 states to 43332 states and 50642 transitions. [2021-11-07 00:53:45,694 INFO L78 Accepts]: Start accepts. Automaton has 43332 states and 50642 transitions. Word has length 292 [2021-11-07 00:53:45,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:45,695 INFO L470 AbstractCegarLoop]: Abstraction has 43332 states and 50642 transitions. [2021-11-07 00:53:45,695 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 86.33333333333333) internal successors, (259), 3 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:45,695 INFO L276 IsEmpty]: Start isEmpty. Operand 43332 states and 50642 transitions. [2021-11-07 00:53:45,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2021-11-07 00:53:45,742 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:45,742 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:53:45,742 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-07 00:53:45,743 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:53:45,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:45,743 INFO L85 PathProgramCache]: Analyzing trace with hash -429241737, now seen corresponding path program 1 times [2021-11-07 00:53:45,744 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:53:45,744 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1955324111] [2021-11-07 00:53:45,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:45,744 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:53:45,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:46,228 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 154 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:53:46,229 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:53:46,229 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1955324111] [2021-11-07 00:53:46,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1955324111] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 00:53:46,230 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1991777569] [2021-11-07 00:53:46,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:46,230 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 00:53:46,230 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 00:53:46,235 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 00:53:46,258 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-07 00:53:46,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:46,912 INFO L263 TraceCheckSpWp]: Trace formula consists of 552 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:53:46,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:53:48,176 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 212 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:53:48,176 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:53:49,106 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 212 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:53:49,106 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1991777569] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:49,106 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2021-11-07 00:53:49,107 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 7 [2021-11-07 00:53:49,107 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [676186006] [2021-11-07 00:53:49,108 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:53:49,108 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:53:49,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:53:49,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-07 00:53:49,110 INFO L87 Difference]: Start difference. First operand 43332 states and 50642 transitions. Second operand has 4 states, 4 states have (on average 74.5) internal successors, (298), 3 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:50,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:50,300 INFO L93 Difference]: Finished difference Result 96816 states and 113027 transitions. [2021-11-07 00:53:50,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:53:50,300 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 74.5) internal successors, (298), 3 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 298 [2021-11-07 00:53:50,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:50,389 INFO L225 Difference]: With dead ends: 96816 [2021-11-07 00:53:50,389 INFO L226 Difference]: Without dead ends: 54200 [2021-11-07 00:53:50,409 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 599 GetRequests, 593 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-07 00:53:50,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54200 states. [2021-11-07 00:53:51,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54200 to 52913. [2021-11-07 00:53:51,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52913 states, 52912 states have (on average 1.1389854853341397) internal successors, (60266), 52912 states have internal predecessors, (60266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:51,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52913 states to 52913 states and 60266 transitions. [2021-11-07 00:53:51,345 INFO L78 Accepts]: Start accepts. Automaton has 52913 states and 60266 transitions. Word has length 298 [2021-11-07 00:53:51,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:51,345 INFO L470 AbstractCegarLoop]: Abstraction has 52913 states and 60266 transitions. [2021-11-07 00:53:51,346 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 74.5) internal successors, (298), 3 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:51,346 INFO L276 IsEmpty]: Start isEmpty. Operand 52913 states and 60266 transitions. [2021-11-07 00:53:51,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2021-11-07 00:53:51,391 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:51,391 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 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, 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] [2021-11-07 00:53:51,427 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-07 00:53:51,606 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-07 00:53:51,606 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:53:51,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:51,607 INFO L85 PathProgramCache]: Analyzing trace with hash 956851396, now seen corresponding path program 1 times [2021-11-07 00:53:51,607 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:53:51,607 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1877876046] [2021-11-07 00:53:51,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:51,608 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:53:51,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:51,859 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 74 proven. 6 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2021-11-07 00:53:51,859 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:53:51,859 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1877876046] [2021-11-07 00:53:51,859 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1877876046] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 00:53:51,860 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [28019498] [2021-11-07 00:53:51,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:51,860 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 00:53:51,860 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 00:53:51,861 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 00:53:51,862 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-07 00:53:52,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:52,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 575 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-07 00:53:52,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:53:55,053 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 161 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-07 00:53:55,054 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:53:56,225 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 161 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-07 00:53:56,225 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [28019498] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:53:56,226 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2021-11-07 00:53:56,226 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [4] total 7 [2021-11-07 00:53:56,226 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715592845] [2021-11-07 00:53:56,227 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:53:56,227 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:53:56,227 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:53:56,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-07 00:53:56,230 INFO L87 Difference]: Start difference. First operand 52913 states and 60266 transitions. Second operand has 4 states, 4 states have (on average 103.25) internal successors, (413), 4 states have internal predecessors, (413), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:57,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:53:57,548 INFO L93 Difference]: Finished difference Result 114834 states and 130962 transitions. [2021-11-07 00:53:57,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:53:57,548 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 103.25) internal successors, (413), 4 states have internal predecessors, (413), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 305 [2021-11-07 00:53:57,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:53:57,636 INFO L225 Difference]: With dead ends: 114834 [2021-11-07 00:53:57,636 INFO L226 Difference]: Without dead ends: 62637 [2021-11-07 00:53:57,664 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 612 GetRequests, 607 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-07 00:53:57,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62637 states. [2021-11-07 00:53:58,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62637 to 62351. [2021-11-07 00:53:58,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62351 states, 62350 states have (on average 1.1179791499599037) internal successors, (69706), 62350 states have internal predecessors, (69706), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:58,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62351 states to 62351 states and 69706 transitions. [2021-11-07 00:53:58,991 INFO L78 Accepts]: Start accepts. Automaton has 62351 states and 69706 transitions. Word has length 305 [2021-11-07 00:53:58,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:53:58,997 INFO L470 AbstractCegarLoop]: Abstraction has 62351 states and 69706 transitions. [2021-11-07 00:53:58,997 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 103.25) internal successors, (413), 4 states have internal predecessors, (413), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:53:59,009 INFO L276 IsEmpty]: Start isEmpty. Operand 62351 states and 69706 transitions. [2021-11-07 00:53:59,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2021-11-07 00:53:59,042 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:53:59,042 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 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, 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, 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, 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] [2021-11-07 00:53:59,065 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-07 00:53:59,243 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-07 00:53:59,243 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:53:59,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:53:59,244 INFO L85 PathProgramCache]: Analyzing trace with hash 1854118609, now seen corresponding path program 1 times [2021-11-07 00:53:59,244 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:53:59,244 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1065511453] [2021-11-07 00:53:59,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:59,244 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:53:59,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:53:59,420 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 233 proven. 18 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-07 00:53:59,421 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:53:59,421 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1065511453] [2021-11-07 00:53:59,421 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1065511453] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 00:53:59,421 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1232737924] [2021-11-07 00:53:59,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:53:59,422 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 00:53:59,422 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 00:53:59,423 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 00:53:59,448 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-07 00:54:00,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:00,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 636 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:54:00,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:54:01,207 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 239 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-07 00:54:01,208 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:54:01,794 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 239 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-07 00:54:01,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1232737924] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:54:01,794 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2021-11-07 00:54:01,795 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [4] total 5 [2021-11-07 00:54:01,795 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [314325082] [2021-11-07 00:54:01,796 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:54:01,796 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:54:01,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:54:01,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-07 00:54:01,797 INFO L87 Difference]: Start difference. First operand 62351 states and 69706 transitions. Second operand has 3 states, 3 states have (on average 100.33333333333333) internal successors, (301), 3 states have internal predecessors, (301), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:02,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:54:02,793 INFO L93 Difference]: Finished difference Result 155162 states and 173358 transitions. [2021-11-07 00:54:02,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:54:02,794 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 100.33333333333333) internal successors, (301), 3 states have internal predecessors, (301), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 324 [2021-11-07 00:54:02,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:54:02,925 INFO L225 Difference]: With dead ends: 155162 [2021-11-07 00:54:02,925 INFO L226 Difference]: Without dead ends: 93527 [2021-11-07 00:54:02,968 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 650 GetRequests, 646 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-07 00:54:03,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93527 states. [2021-11-07 00:54:04,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93527 to 93525. [2021-11-07 00:54:04,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93525 states, 93524 states have (on average 1.1051922501176168) internal successors, (103362), 93524 states have internal predecessors, (103362), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:04,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93525 states to 93525 states and 103362 transitions. [2021-11-07 00:54:04,556 INFO L78 Accepts]: Start accepts. Automaton has 93525 states and 103362 transitions. Word has length 324 [2021-11-07 00:54:04,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:54:04,556 INFO L470 AbstractCegarLoop]: Abstraction has 93525 states and 103362 transitions. [2021-11-07 00:54:04,557 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 100.33333333333333) internal successors, (301), 3 states have internal predecessors, (301), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:04,557 INFO L276 IsEmpty]: Start isEmpty. Operand 93525 states and 103362 transitions. [2021-11-07 00:54:04,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2021-11-07 00:54:04,591 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:54:04,591 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 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] [2021-11-07 00:54:04,614 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-07 00:54:04,792 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-07 00:54:04,792 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:54:04,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:54:04,793 INFO L85 PathProgramCache]: Analyzing trace with hash 1518060826, now seen corresponding path program 1 times [2021-11-07 00:54:04,793 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:54:04,793 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1795297744] [2021-11-07 00:54:04,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:04,794 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:54:04,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:04,932 INFO L134 CoverageAnalysis]: Checked inductivity of 254 backedges. 146 proven. 0 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2021-11-07 00:54:04,935 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:54:04,935 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1795297744] [2021-11-07 00:54:04,935 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1795297744] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:54:04,935 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:54:04,936 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-07 00:54:04,936 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1238258405] [2021-11-07 00:54:04,936 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:54:04,937 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:54:04,937 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:54:04,937 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:54:04,937 INFO L87 Difference]: Start difference. First operand 93525 states and 103362 transitions. Second operand has 3 states, 3 states have (on average 72.66666666666667) internal successors, (218), 2 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:06,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:54:06,304 INFO L93 Difference]: Finished difference Result 186477 states and 206117 transitions. [2021-11-07 00:54:06,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:54:06,304 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 72.66666666666667) internal successors, (218), 2 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 325 [2021-11-07 00:54:06,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:54:06,399 INFO L225 Difference]: With dead ends: 186477 [2021-11-07 00:54:06,399 INFO L226 Difference]: Without dead ends: 93668 [2021-11-07 00:54:06,441 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:54:06,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93668 states. [2021-11-07 00:54:08,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93668 to 93668. [2021-11-07 00:54:08,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93668 states, 93667 states have (on average 1.1051063875217526) internal successors, (103512), 93667 states have internal predecessors, (103512), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:08,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93668 states to 93668 states and 103512 transitions. [2021-11-07 00:54:08,163 INFO L78 Accepts]: Start accepts. Automaton has 93668 states and 103512 transitions. Word has length 325 [2021-11-07 00:54:08,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:54:08,163 INFO L470 AbstractCegarLoop]: Abstraction has 93668 states and 103512 transitions. [2021-11-07 00:54:08,164 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 72.66666666666667) internal successors, (218), 2 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:08,164 INFO L276 IsEmpty]: Start isEmpty. Operand 93668 states and 103512 transitions. [2021-11-07 00:54:08,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 329 [2021-11-07 00:54:08,197 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:54:08,197 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 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] [2021-11-07 00:54:08,197 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-07 00:54:08,198 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:54:08,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:54:08,198 INFO L85 PathProgramCache]: Analyzing trace with hash 1740057677, now seen corresponding path program 1 times [2021-11-07 00:54:08,198 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:54:08,198 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [454308783] [2021-11-07 00:54:08,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:08,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:54:08,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:08,340 INFO L134 CoverageAnalysis]: Checked inductivity of 279 backedges. 151 proven. 6 refuted. 0 times theorem prover too weak. 122 trivial. 0 not checked. [2021-11-07 00:54:08,341 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:54:08,341 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [454308783] [2021-11-07 00:54:08,341 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [454308783] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 00:54:08,341 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1997441423] [2021-11-07 00:54:08,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:08,342 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 00:54:08,342 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 00:54:08,346 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 00:54:08,365 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-07 00:54:09,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:09,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 648 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:54:09,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:54:11,049 INFO L134 CoverageAnalysis]: Checked inductivity of 279 backedges. 157 proven. 0 refuted. 0 times theorem prover too weak. 122 trivial. 0 not checked. [2021-11-07 00:54:11,049 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:54:12,723 INFO L134 CoverageAnalysis]: Checked inductivity of 279 backedges. 157 proven. 0 refuted. 0 times theorem prover too weak. 122 trivial. 0 not checked. [2021-11-07 00:54:12,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1997441423] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:54:12,724 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2021-11-07 00:54:12,725 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [3] total 6 [2021-11-07 00:54:12,725 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1333797802] [2021-11-07 00:54:12,728 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:54:12,729 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:54:12,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:54:12,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:54:12,730 INFO L87 Difference]: Start difference. First operand 93668 states and 103512 transitions. Second operand has 4 states, 4 states have (on average 69.75) internal successors, (279), 4 states have internal predecessors, (279), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:14,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:54:14,369 INFO L93 Difference]: Finished difference Result 200205 states and 221214 transitions. [2021-11-07 00:54:14,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:54:14,369 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 69.75) internal successors, (279), 4 states have internal predecessors, (279), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 328 [2021-11-07 00:54:14,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:54:14,497 INFO L225 Difference]: With dead ends: 200205 [2021-11-07 00:54:14,497 INFO L226 Difference]: Without dead ends: 107396 [2021-11-07 00:54:14,524 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 657 GetRequests, 653 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:54:14,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107396 states. [2021-11-07 00:54:16,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107396 to 97958. [2021-11-07 00:54:16,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97958 states, 97957 states have (on average 1.1015343467031453) internal successors, (107903), 97957 states have internal predecessors, (107903), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:16,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97958 states to 97958 states and 107903 transitions. [2021-11-07 00:54:16,504 INFO L78 Accepts]: Start accepts. Automaton has 97958 states and 107903 transitions. Word has length 328 [2021-11-07 00:54:16,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:54:16,504 INFO L470 AbstractCegarLoop]: Abstraction has 97958 states and 107903 transitions. [2021-11-07 00:54:16,504 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 69.75) internal successors, (279), 4 states have internal predecessors, (279), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:16,504 INFO L276 IsEmpty]: Start isEmpty. Operand 97958 states and 107903 transitions. [2021-11-07 00:54:16,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2021-11-07 00:54:16,541 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:54:16,541 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 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, 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, 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, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:54:16,569 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-11-07 00:54:16,742 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 00:54:16,743 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:54:16,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:54:16,743 INFO L85 PathProgramCache]: Analyzing trace with hash -906920781, now seen corresponding path program 1 times [2021-11-07 00:54:16,743 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:54:16,743 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1066076389] [2021-11-07 00:54:16,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:16,744 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:54:16,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:16,973 INFO L134 CoverageAnalysis]: Checked inductivity of 307 backedges. 111 proven. 6 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-11-07 00:54:16,973 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:54:16,973 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1066076389] [2021-11-07 00:54:16,974 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1066076389] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 00:54:16,974 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1178578096] [2021-11-07 00:54:16,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:16,974 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 00:54:16,974 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 00:54:16,975 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 00:54:17,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-07 00:54:18,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:18,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 661 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-07 00:54:18,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:54:21,142 INFO L134 CoverageAnalysis]: Checked inductivity of 307 backedges. 117 proven. 0 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-11-07 00:54:21,156 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:54:23,377 INFO L134 CoverageAnalysis]: Checked inductivity of 307 backedges. 117 proven. 0 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-11-07 00:54:23,377 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1178578096] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:54:23,378 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2021-11-07 00:54:23,378 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [4] total 9 [2021-11-07 00:54:23,378 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517453191] [2021-11-07 00:54:23,379 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 00:54:23,379 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:54:23,380 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 00:54:23,380 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-07 00:54:23,380 INFO L87 Difference]: Start difference. First operand 97958 states and 107903 transitions. Second operand has 7 states, 7 states have (on average 31.285714285714285) internal successors, (219), 6 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:25,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:54:25,312 INFO L93 Difference]: Finished difference Result 198642 states and 218571 transitions. [2021-11-07 00:54:25,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 00:54:25,312 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 31.285714285714285) internal successors, (219), 6 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 330 [2021-11-07 00:54:25,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:54:25,427 INFO L225 Difference]: With dead ends: 198642 [2021-11-07 00:54:25,427 INFO L226 Difference]: Without dead ends: 101686 [2021-11-07 00:54:25,456 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 664 GetRequests, 654 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=92, Unknown=0, NotChecked=0, Total=132 [2021-11-07 00:54:25,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101686 states. [2021-11-07 00:54:27,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101686 to 99531. [2021-11-07 00:54:27,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99531 states, 99530 states have (on average 1.1006731638701899) internal successors, (109550), 99530 states have internal predecessors, (109550), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:27,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99531 states to 99531 states and 109550 transitions. [2021-11-07 00:54:27,535 INFO L78 Accepts]: Start accepts. Automaton has 99531 states and 109550 transitions. Word has length 330 [2021-11-07 00:54:27,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:54:27,535 INFO L470 AbstractCegarLoop]: Abstraction has 99531 states and 109550 transitions. [2021-11-07 00:54:27,536 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 31.285714285714285) internal successors, (219), 6 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:27,536 INFO L276 IsEmpty]: Start isEmpty. Operand 99531 states and 109550 transitions. [2021-11-07 00:54:27,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2021-11-07 00:54:27,567 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:54:27,567 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 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, 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] [2021-11-07 00:54:27,594 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-11-07 00:54:27,768 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a692a209-c7ac-4b0d-ae7e-72acc911c8b1/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable19 [2021-11-07 00:54:27,768 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:54:27,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:54:27,769 INFO L85 PathProgramCache]: Analyzing trace with hash 1163146312, now seen corresponding path program 1 times [2021-11-07 00:54:27,769 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:54:27,769 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2042129759] [2021-11-07 00:54:27,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:27,769 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:54:27,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:27,961 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 251 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 00:54:27,962 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:54:27,962 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2042129759] [2021-11-07 00:54:27,962 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2042129759] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:54:27,962 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:54:27,962 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:54:27,963 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [312558881] [2021-11-07 00:54:27,963 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:54:27,963 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:54:27,964 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:54:27,964 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:54:27,964 INFO L87 Difference]: Start difference. First operand 99531 states and 109550 transitions. Second operand has 3 states, 3 states have (on average 108.33333333333333) internal successors, (325), 3 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:29,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:54:29,741 INFO L93 Difference]: Finished difference Result 248541 states and 272808 transitions. [2021-11-07 00:54:29,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:54:29,742 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 108.33333333333333) internal successors, (325), 3 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 330 [2021-11-07 00:54:29,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:54:29,926 INFO L225 Difference]: With dead ends: 248541 [2021-11-07 00:54:29,926 INFO L226 Difference]: Without dead ends: 151585 [2021-11-07 00:54:29,973 INFO L786 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 [2021-11-07 00:54:30,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151585 states. [2021-11-07 00:54:32,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151585 to 150010. [2021-11-07 00:54:32,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150010 states, 150009 states have (on average 1.0915078428627616) internal successors, (163736), 150009 states have internal predecessors, (163736), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:32,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150010 states to 150010 states and 163736 transitions. [2021-11-07 00:54:32,643 INFO L78 Accepts]: Start accepts. Automaton has 150010 states and 163736 transitions. Word has length 330 [2021-11-07 00:54:32,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:54:32,644 INFO L470 AbstractCegarLoop]: Abstraction has 150010 states and 163736 transitions. [2021-11-07 00:54:32,644 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 108.33333333333333) internal successors, (325), 3 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:32,644 INFO L276 IsEmpty]: Start isEmpty. Operand 150010 states and 163736 transitions. [2021-11-07 00:54:32,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 344 [2021-11-07 00:54:32,718 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:54:32,718 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 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, 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, 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, 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] [2021-11-07 00:54:32,718 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-11-07 00:54:32,718 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:54:32,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:54:32,719 INFO L85 PathProgramCache]: Analyzing trace with hash 22150206, now seen corresponding path program 1 times [2021-11-07 00:54:32,719 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 00:54:32,719 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [447948955] [2021-11-07 00:54:32,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:32,719 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 00:54:33,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:33,473 INFO L134 CoverageAnalysis]: Checked inductivity of 348 backedges. 287 proven. 0 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-07 00:54:33,473 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 00:54:33,474 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [447948955] [2021-11-07 00:54:33,474 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [447948955] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 00:54:33,474 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:54:33,474 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 00:54:33,474 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1404051704] [2021-11-07 00:54:33,476 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:54:33,477 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 00:54:33,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:54:33,478 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:54:33,478 INFO L87 Difference]: Start difference. First operand 150010 states and 163736 transitions. Second operand has 3 states, 3 states have (on average 97.0) internal successors, (291), 3 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:34,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:54:34,812 INFO L93 Difference]: Finished difference Result 291582 states and 319028 transitions. [2021-11-07 00:54:34,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:54:34,813 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 97.0) internal successors, (291), 3 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 343 [2021-11-07 00:54:34,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:54:35,560 INFO L225 Difference]: With dead ends: 291582 [2021-11-07 00:54:35,561 INFO L226 Difference]: Without dead ends: 142431 [2021-11-07 00:54:35,616 INFO L786 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 [2021-11-07 00:54:35,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142431 states.