./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label42+token_ring.08.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 63182f13 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label42+token_ring.08.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 9803c0f5a18eedfb3ad16cce49537bdc49a8790d5c61a825350a143730d73381 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-12 23:53:00,040 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-12 23:53:00,042 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-12 23:53:00,075 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-12 23:53:00,076 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-12 23:53:00,078 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-12 23:53:00,079 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-12 23:53:00,082 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-12 23:53:00,084 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-12 23:53:00,086 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-12 23:53:00,087 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-12 23:53:00,088 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-12 23:53:00,089 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-12 23:53:00,090 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-12 23:53:00,092 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-12 23:53:00,093 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-12 23:53:00,094 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-12 23:53:00,095 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-12 23:53:00,097 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-12 23:53:00,100 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-12 23:53:00,102 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-12 23:53:00,103 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-12 23:53:00,105 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-12 23:53:00,106 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-12 23:53:00,110 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-12 23:53:00,110 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-12 23:53:00,110 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-12 23:53:00,112 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-12 23:53:00,112 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-12 23:53:00,113 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-12 23:53:00,114 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-12 23:53:00,115 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-12 23:53:00,116 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-12 23:53:00,117 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-12 23:53:00,118 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-12 23:53:00,118 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-12 23:53:00,119 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-12 23:53:00,119 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-12 23:53:00,120 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-12 23:53:00,121 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-12 23:53:00,121 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-12 23:53:00,122 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-12 23:53:00,147 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-12 23:53:00,148 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-12 23:53:00,149 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-12 23:53:00,149 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-12 23:53:00,149 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-12 23:53:00,149 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-12 23:53:00,149 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-12 23:53:00,150 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-12 23:53:00,150 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-12 23:53:00,150 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-12 23:53:00,150 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-12 23:53:00,151 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-12 23:53:00,151 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-12 23:53:00,151 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-12 23:53:00,151 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-12 23:53:00,152 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-12 23:53:00,152 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-12 23:53:00,153 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-12 23:53:00,153 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-12 23:53:00,153 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-12 23:53:00,153 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-12 23:53:00,154 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-12 23:53:00,154 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-12 23:53:00,154 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-12 23:53:00,154 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-12 23:53:00,154 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-12 23:53:00,155 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-12 23:53:00,155 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-12 23:53:00,155 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-12 23:53:00,155 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-12 23:53:00,156 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-12 23:53:00,156 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 23:53:00,156 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-12 23:53:00,156 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-12 23:53:00,157 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-12 23:53:00,157 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-12 23:53:00,157 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-12 23:53:00,157 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-12 23:53:00,157 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-12 23:53:00,158 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-12 23:53:00,158 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_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9803c0f5a18eedfb3ad16cce49537bdc49a8790d5c61a825350a143730d73381 [2021-11-12 23:53:00,450 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-12 23:53:00,471 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-12 23:53:00,474 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-12 23:53:00,475 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-12 23:53:00,476 INFO L275 PluginConnector]: CDTParser initialized [2021-11-12 23:53:00,477 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/combinations/Problem05_label42+token_ring.08.cil-2.c [2021-11-12 23:53:00,561 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/data/16b706bdf/cf0d949e60a04e2ca7e8870ad2b54878/FLAGdffb283e1 [2021-11-12 23:53:01,711 INFO L306 CDTParser]: Found 1 translation units. [2021-11-12 23:53:01,712 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/sv-benchmarks/c/combinations/Problem05_label42+token_ring.08.cil-2.c [2021-11-12 23:53:01,770 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/data/16b706bdf/cf0d949e60a04e2ca7e8870ad2b54878/FLAGdffb283e1 [2021-11-12 23:53:01,963 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/data/16b706bdf/cf0d949e60a04e2ca7e8870ad2b54878 [2021-11-12 23:53:01,968 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-12 23:53:01,970 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-12 23:53:01,973 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-12 23:53:01,973 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-12 23:53:01,976 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-12 23:53:01,978 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 11:53:01" (1/1) ... [2021-11-12 23:53:01,980 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@23eaccfc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:53:01, skipping insertion in model container [2021-11-12 23:53:01,981 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 11:53:01" (1/1) ... [2021-11-12 23:53:01,988 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-12 23:53:02,260 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 23:53:04,668 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_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/sv-benchmarks/c/combinations/Problem05_label42+token_ring.08.cil-2.c[378560,378573] [2021-11-12 23:53:04,708 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_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/sv-benchmarks/c/combinations/Problem05_label42+token_ring.08.cil-2.c[383339,383352] [2021-11-12 23:53:05,023 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 23:53:05,034 INFO L203 MainTranslator]: Completed pre-run [2021-11-12 23:53:06,270 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_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/sv-benchmarks/c/combinations/Problem05_label42+token_ring.08.cil-2.c[378560,378573] [2021-11-12 23:53:06,278 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_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/sv-benchmarks/c/combinations/Problem05_label42+token_ring.08.cil-2.c[383339,383352] [2021-11-12 23:53:06,314 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 23:53:06,431 INFO L208 MainTranslator]: Completed translation [2021-11-12 23:53:06,431 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:53:06 WrapperNode [2021-11-12 23:53:06,431 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-12 23:53:06,433 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-12 23:53:06,433 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-12 23:53:06,433 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-12 23:53:06,441 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:53:06" (1/1) ... [2021-11-12 23:53:06,588 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:53:06" (1/1) ... [2021-11-12 23:53:07,050 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-12 23:53:07,051 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-12 23:53:07,051 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-12 23:53:07,051 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-12 23:53:07,062 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:53:06" (1/1) ... [2021-11-12 23:53:07,062 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:53:06" (1/1) ... [2021-11-12 23:53:07,257 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:53:06" (1/1) ... [2021-11-12 23:53:07,257 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:53:06" (1/1) ... [2021-11-12 23:53:07,611 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:53:06" (1/1) ... [2021-11-12 23:53:07,709 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:53:06" (1/1) ... [2021-11-12 23:53:07,760 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:53:06" (1/1) ... [2021-11-12 23:53:07,876 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-12 23:53:07,878 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-12 23:53:07,878 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-12 23:53:07,878 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-12 23:53:07,880 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:53:06" (1/1) ... [2021-11-12 23:53:07,888 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 23:53:07,900 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:53:07,918 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-12 23:53:07,946 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-12 23:53:07,972 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-12 23:53:07,973 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-12 23:53:07,973 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-12 23:53:07,973 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-12 23:53:07,973 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-12 23:53:07,973 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-12 23:53:07,974 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-12 23:53:07,974 INFO L130 BoogieDeclarations]: Found specification of procedure error [2021-11-12 23:53:07,974 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2021-11-12 23:53:07,974 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-12 23:53:07,974 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-12 23:53:07,974 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-12 23:53:07,975 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-12 23:53:07,975 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-12 23:53:07,975 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-12 23:53:07,975 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-12 23:53:07,975 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-12 23:53:07,975 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-12 23:53:18,407 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-12 23:53:18,407 INFO L299 CfgBuilder]: Removed 12 assume(true) statements. [2021-11-12 23:53:18,415 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 11:53:18 BoogieIcfgContainer [2021-11-12 23:53:18,415 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-12 23:53:18,419 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-12 23:53:18,419 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-12 23:53:18,424 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-12 23:53:18,424 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 11:53:01" (1/3) ... [2021-11-12 23:53:18,425 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17a29f3f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 11:53:18, skipping insertion in model container [2021-11-12 23:53:18,425 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:53:06" (2/3) ... [2021-11-12 23:53:18,426 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17a29f3f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 11:53:18, skipping insertion in model container [2021-11-12 23:53:18,426 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 11:53:18" (3/3) ... [2021-11-12 23:53:18,427 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem05_label42+token_ring.08.cil-2.c [2021-11-12 23:53:18,433 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-12 23:53:18,433 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-12 23:53:18,507 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-12 23:53:18,517 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-12 23:53:18,517 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-12 23:53:18,581 INFO L276 IsEmpty]: Start isEmpty. Operand has 1793 states, 1759 states have (on average 1.9641841955656623) internal successors, (3455), 1764 states have internal predecessors, (3455), 24 states have call successors, (24), 7 states have call predecessors, (24), 7 states have return successors, (24), 23 states have call predecessors, (24), 24 states have call successors, (24) [2021-11-12 23:53:18,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-12 23:53:18,592 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:53:18,592 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:53:18,593 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:53:18,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:53:18,599 INFO L85 PathProgramCache]: Analyzing trace with hash 1600950352, now seen corresponding path program 1 times [2021-11-12 23:53:18,607 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:53:18,608 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [383292963] [2021-11-12 23:53:18,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:53:18,609 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:53:18,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:53:18,944 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:53:18,945 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:53:18,945 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [383292963] [2021-11-12 23:53:18,946 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [383292963] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:53:18,946 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:53:18,946 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-12 23:53:18,948 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194651933] [2021-11-12 23:53:18,949 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:53:18,953 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:53:18,953 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:53:18,979 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:53:18,980 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-12 23:53:18,988 INFO L87 Difference]: Start difference. First operand has 1793 states, 1759 states have (on average 1.9641841955656623) internal successors, (3455), 1764 states have internal predecessors, (3455), 24 states have call successors, (24), 7 states have call predecessors, (24), 7 states have return successors, (24), 23 states have call predecessors, (24), 24 states have call successors, (24) Second operand has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-12 23:53:20,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:53:20,145 INFO L93 Difference]: Finished difference Result 3712 states and 7223 transitions. [2021-11-12 23:53:20,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 23:53:20,148 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 56 [2021-11-12 23:53:20,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:53:20,174 INFO L225 Difference]: With dead ends: 3712 [2021-11-12 23:53:20,174 INFO L226 Difference]: Without dead ends: 1918 [2021-11-12 23:53:20,183 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-12 23:53:20,187 INFO L933 BasicCegarLoop]: 3398 mSDtfsCounter, 3655 mSDsluCounter, 3599 mSDsCounter, 0 mSdLazyCounter, 666 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 658.62ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3655 SdHoareTripleChecker+Valid, 6712 SdHoareTripleChecker+Invalid, 680 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 34.86ms SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 666 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 901.43ms IncrementalHoareTripleChecker+Time [2021-11-12 23:53:20,189 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3655 Valid, 6712 Invalid, 680 Unknown, 0 Unchecked, 34.86ms Time], IncrementalHoareTripleChecker [14 Valid, 666 Invalid, 0 Unknown, 0 Unchecked, 901.43ms Time] [2021-11-12 23:53:20,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1918 states. [2021-11-12 23:53:20,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1918 to 1917. [2021-11-12 23:53:20,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1917 states, 1861 states have (on average 1.9333691563675444) internal successors, (3598), 1865 states have internal predecessors, (3598), 42 states have call successors, (42), 13 states have call predecessors, (42), 12 states have return successors, (40), 39 states have call predecessors, (40), 40 states have call successors, (40) [2021-11-12 23:53:20,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1917 states to 1917 states and 3680 transitions. [2021-11-12 23:53:20,366 INFO L78 Accepts]: Start accepts. Automaton has 1917 states and 3680 transitions. Word has length 56 [2021-11-12 23:53:20,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:53:20,367 INFO L470 AbstractCegarLoop]: Abstraction has 1917 states and 3680 transitions. [2021-11-12 23:53:20,367 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-12 23:53:20,367 INFO L276 IsEmpty]: Start isEmpty. Operand 1917 states and 3680 transitions. [2021-11-12 23:53:20,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-12 23:53:20,380 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:53:20,381 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-12 23:53:20,381 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-12 23:53:20,382 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:53:20,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:53:20,383 INFO L85 PathProgramCache]: Analyzing trace with hash 2068278992, now seen corresponding path program 1 times [2021-11-12 23:53:20,383 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:53:20,383 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1251609978] [2021-11-12 23:53:20,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:53:20,384 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:53:20,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:53:20,652 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 23:53:20,653 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:53:20,654 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1251609978] [2021-11-12 23:53:20,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1251609978] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:53:20,655 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [249417411] [2021-11-12 23:53:20,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:53:20,655 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:53:20,656 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:53:20,662 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:53:20,680 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-12 23:53:20,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:53:20,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 781 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:53:20,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:53:21,154 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-12 23:53:21,154 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:53:21,390 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-12 23:53:21,391 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [249417411] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:53:21,391 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:53:21,391 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 23:53:21,392 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1545771417] [2021-11-12 23:53:21,393 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:53:21,394 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:53:21,394 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:53:21,395 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:53:21,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:53:21,395 INFO L87 Difference]: Start difference. First operand 1917 states and 3680 transitions. Second operand has 3 states, 3 states have (on average 25.0) internal successors, (75), 2 states have internal predecessors, (75), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:53:21,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:53:21,965 INFO L93 Difference]: Finished difference Result 2452 states and 4499 transitions. [2021-11-12 23:53:21,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:53:21,966 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 2 states have internal predecessors, (75), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 109 [2021-11-12 23:53:21,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:53:21,987 INFO L225 Difference]: With dead ends: 2452 [2021-11-12 23:53:21,988 INFO L226 Difference]: Without dead ends: 2181 [2021-11-12 23:53:21,990 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 215 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:53:21,992 INFO L933 BasicCegarLoop]: 3289 mSDtfsCounter, 3455 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 295 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 328.32ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3455 SdHoareTripleChecker+Valid, 3461 SdHoareTripleChecker+Invalid, 297 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 16.40ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 295 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 444.55ms IncrementalHoareTripleChecker+Time [2021-11-12 23:53:21,993 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3455 Valid, 3461 Invalid, 297 Unknown, 0 Unchecked, 16.40ms Time], IncrementalHoareTripleChecker [2 Valid, 295 Invalid, 0 Unknown, 0 Unchecked, 444.55ms Time] [2021-11-12 23:53:22,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2181 states. [2021-11-12 23:53:22,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2181 to 2175. [2021-11-12 23:53:22,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2175 states, 2073 states have (on average 1.8876025084418717) internal successors, (3913), 2078 states have internal predecessors, (3913), 76 states have call successors, (76), 25 states have call predecessors, (76), 24 states have return successors, (74), 72 states have call predecessors, (74), 74 states have call successors, (74) [2021-11-12 23:53:22,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2175 states to 2175 states and 4063 transitions. [2021-11-12 23:53:22,112 INFO L78 Accepts]: Start accepts. Automaton has 2175 states and 4063 transitions. Word has length 109 [2021-11-12 23:53:22,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:53:22,113 INFO L470 AbstractCegarLoop]: Abstraction has 2175 states and 4063 transitions. [2021-11-12 23:53:22,114 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 2 states have internal predecessors, (75), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:53:22,114 INFO L276 IsEmpty]: Start isEmpty. Operand 2175 states and 4063 transitions. [2021-11-12 23:53:22,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-12 23:53:22,122 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:53:22,122 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-12 23:53:22,162 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-12 23:53:22,349 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:53:22,349 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:53:22,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:53:22,350 INFO L85 PathProgramCache]: Analyzing trace with hash 1191451952, now seen corresponding path program 1 times [2021-11-12 23:53:22,350 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:53:22,350 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1949336723] [2021-11-12 23:53:22,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:53:22,350 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:53:22,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:53:22,489 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 23:53:22,490 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:53:22,490 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1949336723] [2021-11-12 23:53:22,490 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1949336723] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:53:22,490 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [37793362] [2021-11-12 23:53:22,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:53:22,491 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:53:22,491 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:53:22,501 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:53:22,517 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-12 23:53:22,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:53:22,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 775 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:53:22,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:53:22,933 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-12 23:53:22,934 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:53:23,187 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-12 23:53:23,187 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [37793362] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:53:23,188 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:53:23,188 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 23:53:23,188 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1403147657] [2021-11-12 23:53:23,188 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:53:23,189 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:53:23,189 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:53:23,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:53:23,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:53:23,190 INFO L87 Difference]: Start difference. First operand 2175 states and 4063 transitions. Second operand has 3 states, 3 states have (on average 22.0) internal successors, (66), 2 states have internal predecessors, (66), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:53:23,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:53:23,764 INFO L93 Difference]: Finished difference Result 3220 states and 5658 transitions. [2021-11-12 23:53:23,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:53:23,765 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 2 states have internal predecessors, (66), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 109 [2021-11-12 23:53:23,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:53:23,914 INFO L225 Difference]: With dead ends: 3220 [2021-11-12 23:53:23,914 INFO L226 Difference]: Without dead ends: 2691 [2021-11-12 23:53:23,917 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 215 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:53:23,918 INFO L933 BasicCegarLoop]: 3288 mSDtfsCounter, 3464 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 295 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 360.62ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3464 SdHoareTripleChecker+Valid, 3460 SdHoareTripleChecker+Invalid, 297 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 16.75ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 295 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 433.71ms IncrementalHoareTripleChecker+Time [2021-11-12 23:53:23,919 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3464 Valid, 3460 Invalid, 297 Unknown, 0 Unchecked, 16.75ms Time], IncrementalHoareTripleChecker [2 Valid, 295 Invalid, 0 Unknown, 0 Unchecked, 433.71ms Time] [2021-11-12 23:53:23,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2691 states. [2021-11-12 23:53:24,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2691 to 2683. [2021-11-12 23:53:24,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2683 states, 2491 states have (on average 1.818948213568848) internal successors, (4531), 2498 states have internal predecessors, (4531), 142 states have call successors, (142), 49 states have call predecessors, (142), 48 states have return successors, (140), 136 states have call predecessors, (140), 140 states have call successors, (140) [2021-11-12 23:53:24,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2683 states to 2683 states and 4813 transitions. [2021-11-12 23:53:24,026 INFO L78 Accepts]: Start accepts. Automaton has 2683 states and 4813 transitions. Word has length 109 [2021-11-12 23:53:24,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:53:24,026 INFO L470 AbstractCegarLoop]: Abstraction has 2683 states and 4813 transitions. [2021-11-12 23:53:24,027 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 2 states have internal predecessors, (66), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:53:24,027 INFO L276 IsEmpty]: Start isEmpty. Operand 2683 states and 4813 transitions. [2021-11-12 23:53:24,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-12 23:53:24,031 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:53:24,031 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-12 23:53:24,070 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-12 23:53:24,251 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:53:24,251 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:53:24,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:53:24,252 INFO L85 PathProgramCache]: Analyzing trace with hash 1966447312, now seen corresponding path program 1 times [2021-11-12 23:53:24,252 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:53:24,252 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1991223200] [2021-11-12 23:53:24,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:53:24,253 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:53:24,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:53:24,325 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 23:53:24,325 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:53:24,325 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1991223200] [2021-11-12 23:53:24,326 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1991223200] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:53:24,329 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [601424625] [2021-11-12 23:53:24,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:53:24,331 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:53:24,331 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:53:24,332 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:53:24,361 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-12 23:53:24,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:53:24,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 769 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:53:24,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:53:24,783 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-12 23:53:24,783 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:53:25,055 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-12 23:53:25,055 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [601424625] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:53:25,055 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:53:25,055 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 23:53:25,056 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500665747] [2021-11-12 23:53:25,056 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:53:25,057 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:53:25,057 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:53:25,057 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:53:25,057 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:53:25,058 INFO L87 Difference]: Start difference. First operand 2683 states and 4813 transitions. Second operand has 3 states, 3 states have (on average 23.0) internal successors, (69), 2 states have internal predecessors, (69), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:53:25,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:53:25,593 INFO L93 Difference]: Finished difference Result 4732 states and 7926 transitions. [2021-11-12 23:53:25,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:53:25,594 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.0) internal successors, (69), 2 states have internal predecessors, (69), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 109 [2021-11-12 23:53:25,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:53:25,620 INFO L225 Difference]: With dead ends: 4732 [2021-11-12 23:53:25,620 INFO L226 Difference]: Without dead ends: 3695 [2021-11-12 23:53:25,625 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 215 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:53:25,627 INFO L933 BasicCegarLoop]: 3253 mSDtfsCounter, 3461 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 291 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 320.35ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3461 SdHoareTripleChecker+Valid, 3425 SdHoareTripleChecker+Invalid, 293 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 12.65ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 291 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 385.20ms IncrementalHoareTripleChecker+Time [2021-11-12 23:53:25,628 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3461 Valid, 3425 Invalid, 293 Unknown, 0 Unchecked, 12.65ms Time], IncrementalHoareTripleChecker [2 Valid, 291 Invalid, 0 Unknown, 0 Unchecked, 385.20ms Time] [2021-11-12 23:53:25,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3695 states. [2021-11-12 23:53:25,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3695 to 3683. [2021-11-12 23:53:25,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3683 states, 3315 states have (on average 1.7324283559577678) internal successors, (5743), 3326 states have internal predecessors, (5743), 270 states have call successors, (270), 97 states have call predecessors, (270), 96 states have return successors, (268), 260 states have call predecessors, (268), 268 states have call successors, (268) [2021-11-12 23:53:25,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3683 states to 3683 states and 6281 transitions. [2021-11-12 23:53:25,783 INFO L78 Accepts]: Start accepts. Automaton has 3683 states and 6281 transitions. Word has length 109 [2021-11-12 23:53:25,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:53:25,784 INFO L470 AbstractCegarLoop]: Abstraction has 3683 states and 6281 transitions. [2021-11-12 23:53:25,784 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.0) internal successors, (69), 2 states have internal predecessors, (69), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:53:25,784 INFO L276 IsEmpty]: Start isEmpty. Operand 3683 states and 6281 transitions. [2021-11-12 23:53:25,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-12 23:53:25,792 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:53:25,792 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-12 23:53:25,827 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-12 23:53:26,009 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:53:26,009 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:53:26,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:53:26,009 INFO L85 PathProgramCache]: Analyzing trace with hash -695336656, now seen corresponding path program 1 times [2021-11-12 23:53:26,010 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:53:26,010 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [461142419] [2021-11-12 23:53:26,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:53:26,010 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:53:26,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:53:26,134 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 23:53:26,134 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:53:26,135 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [461142419] [2021-11-12 23:53:26,135 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [461142419] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:53:26,135 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [802280286] [2021-11-12 23:53:26,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:53:26,135 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:53:26,136 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:53:26,137 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:53:26,156 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-12 23:53:26,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:53:26,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 763 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:53:26,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:53:26,568 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-12 23:53:26,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:53:26,814 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-12 23:53:26,814 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [802280286] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:53:26,814 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:53:26,815 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 23:53:26,815 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200710180] [2021-11-12 23:53:26,815 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:53:26,816 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:53:26,816 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:53:26,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:53:26,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:53:26,817 INFO L87 Difference]: Start difference. First operand 3683 states and 6281 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:53:27,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:53:27,389 INFO L93 Difference]: Finished difference Result 7708 states and 12362 transitions. [2021-11-12 23:53:27,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:53:27,390 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 109 [2021-11-12 23:53:27,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:53:27,432 INFO L225 Difference]: With dead ends: 7708 [2021-11-12 23:53:27,432 INFO L226 Difference]: Without dead ends: 5671 [2021-11-12 23:53:27,441 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 215 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:53:27,444 INFO L933 BasicCegarLoop]: 3253 mSDtfsCounter, 3449 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 291 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 321.98ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3449 SdHoareTripleChecker+Valid, 3425 SdHoareTripleChecker+Invalid, 293 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 10.42ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 291 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 385.30ms IncrementalHoareTripleChecker+Time [2021-11-12 23:53:27,444 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3449 Valid, 3425 Invalid, 293 Unknown, 0 Unchecked, 10.42ms Time], IncrementalHoareTripleChecker [2 Valid, 291 Invalid, 0 Unknown, 0 Unchecked, 385.30ms Time] [2021-11-12 23:53:27,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5671 states. [2021-11-12 23:53:27,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5671 to 5651. [2021-11-12 23:53:27,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5651 states, 4939 states have (on average 1.643855031382871) internal successors, (8119), 4958 states have internal predecessors, (8119), 518 states have call successors, (518), 193 states have call predecessors, (518), 192 states have return successors, (516), 500 states have call predecessors, (516), 516 states have call successors, (516) [2021-11-12 23:53:27,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5651 states to 5651 states and 9153 transitions. [2021-11-12 23:53:27,708 INFO L78 Accepts]: Start accepts. Automaton has 5651 states and 9153 transitions. Word has length 109 [2021-11-12 23:53:27,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:53:27,708 INFO L470 AbstractCegarLoop]: Abstraction has 5651 states and 9153 transitions. [2021-11-12 23:53:27,708 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:53:27,709 INFO L276 IsEmpty]: Start isEmpty. Operand 5651 states and 9153 transitions. [2021-11-12 23:53:27,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-12 23:53:27,719 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:53:27,719 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-12 23:53:27,760 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-12 23:53:27,933 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:53:27,933 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:53:27,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:53:27,933 INFO L85 PathProgramCache]: Analyzing trace with hash -1618675824, now seen corresponding path program 1 times [2021-11-12 23:53:27,933 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:53:27,934 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [143469281] [2021-11-12 23:53:27,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:53:27,934 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:53:27,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:53:28,021 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-12 23:53:28,021 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:53:28,022 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [143469281] [2021-11-12 23:53:28,022 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [143469281] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:53:28,022 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:53:28,022 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-12 23:53:28,022 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418940585] [2021-11-12 23:53:28,022 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:53:28,023 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:53:28,023 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:53:28,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:53:28,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:53:28,034 INFO L87 Difference]: Start difference. First operand 5651 states and 9153 transitions. Second operand has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-12 23:53:28,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:53:28,837 INFO L93 Difference]: Finished difference Result 8775 states and 13908 transitions. [2021-11-12 23:53:28,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:53:28,839 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 109 [2021-11-12 23:53:28,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:53:28,916 INFO L225 Difference]: With dead ends: 8775 [2021-11-12 23:53:28,916 INFO L226 Difference]: Without dead ends: 6707 [2021-11-12 23:53:28,925 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:53:28,927 INFO L933 BasicCegarLoop]: 3331 mSDtfsCounter, 91 mSDsluCounter, 3490 mSDsCounter, 0 mSdLazyCounter, 522 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 371.59ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 6576 SdHoareTripleChecker+Invalid, 522 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 9.57ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 522 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 441.02ms IncrementalHoareTripleChecker+Time [2021-11-12 23:53:28,927 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 6576 Invalid, 522 Unknown, 0 Unchecked, 9.57ms Time], IncrementalHoareTripleChecker [0 Valid, 522 Invalid, 0 Unknown, 0 Unchecked, 441.02ms Time] [2021-11-12 23:53:28,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6707 states. [2021-11-12 23:53:29,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6707 to 6371. [2021-11-12 23:53:29,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6371 states, 5627 states have (on average 1.6532788341922873) internal successors, (9303), 5646 states have internal predecessors, (9303), 534 states have call successors, (534), 209 states have call predecessors, (534), 208 states have return successors, (532), 516 states have call predecessors, (532), 532 states have call successors, (532) [2021-11-12 23:53:29,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6371 states to 6371 states and 10369 transitions. [2021-11-12 23:53:29,224 INFO L78 Accepts]: Start accepts. Automaton has 6371 states and 10369 transitions. Word has length 109 [2021-11-12 23:53:29,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:53:29,225 INFO L470 AbstractCegarLoop]: Abstraction has 6371 states and 10369 transitions. [2021-11-12 23:53:29,225 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-12 23:53:29,225 INFO L276 IsEmpty]: Start isEmpty. Operand 6371 states and 10369 transitions. [2021-11-12 23:53:29,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-12 23:53:29,247 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:53:29,248 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:53:29,248 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-12 23:53:29,248 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:53:29,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:53:29,249 INFO L85 PathProgramCache]: Analyzing trace with hash -413572576, now seen corresponding path program 1 times [2021-11-12 23:53:29,249 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:53:29,250 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1072491275] [2021-11-12 23:53:29,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:53:29,251 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:53:29,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:53:29,343 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-12 23:53:29,344 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:53:29,344 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1072491275] [2021-11-12 23:53:29,344 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1072491275] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:53:29,344 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:53:29,345 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-12 23:53:29,348 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1970045781] [2021-11-12 23:53:29,348 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:53:29,349 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:53:29,349 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:53:29,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:53:29,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:53:29,350 INFO L87 Difference]: Start difference. First operand 6371 states and 10369 transitions. Second operand has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 23:53:30,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:53:30,032 INFO L93 Difference]: Finished difference Result 15676 states and 24586 transitions. [2021-11-12 23:53:30,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:53:30,033 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 147 [2021-11-12 23:53:30,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:53:30,076 INFO L225 Difference]: With dead ends: 15676 [2021-11-12 23:53:30,076 INFO L226 Difference]: Without dead ends: 10951 [2021-11-12 23:53:30,096 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:53:30,097 INFO L933 BasicCegarLoop]: 3255 mSDtfsCounter, 3451 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 307.71ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3451 SdHoareTripleChecker+Valid, 3427 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 9.33ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 365.62ms IncrementalHoareTripleChecker+Time [2021-11-12 23:53:30,097 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3451 Valid, 3427 Invalid, 291 Unknown, 0 Unchecked, 9.33ms Time], IncrementalHoareTripleChecker [2 Valid, 289 Invalid, 0 Unknown, 0 Unchecked, 365.62ms Time] [2021-11-12 23:53:30,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10951 states. [2021-11-12 23:53:30,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10951 to 10899. [2021-11-12 23:53:30,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10899 states, 9451 states have (on average 1.5887207702888584) internal successors, (15015), 9486 states have internal predecessors, (15015), 1030 states have call successors, (1030), 417 states have call predecessors, (1030), 416 states have return successors, (1028), 996 states have call predecessors, (1028), 1028 states have call successors, (1028) [2021-11-12 23:53:30,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10899 states to 10899 states and 17073 transitions. [2021-11-12 23:53:30,580 INFO L78 Accepts]: Start accepts. Automaton has 10899 states and 17073 transitions. Word has length 147 [2021-11-12 23:53:30,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:53:30,580 INFO L470 AbstractCegarLoop]: Abstraction has 10899 states and 17073 transitions. [2021-11-12 23:53:30,581 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 23:53:30,581 INFO L276 IsEmpty]: Start isEmpty. Operand 10899 states and 17073 transitions. [2021-11-12 23:53:30,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-12 23:53:30,614 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:53:30,614 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:53:30,614 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-12 23:53:30,614 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:53:30,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:53:30,615 INFO L85 PathProgramCache]: Analyzing trace with hash 2044885871, now seen corresponding path program 1 times [2021-11-12 23:53:30,615 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:53:30,615 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [323982603] [2021-11-12 23:53:30,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:53:30,616 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:53:30,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:53:30,699 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-12 23:53:30,699 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:53:30,699 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [323982603] [2021-11-12 23:53:30,699 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [323982603] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:53:30,700 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:53:30,700 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-12 23:53:30,700 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1697515341] [2021-11-12 23:53:30,700 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:53:30,701 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:53:30,701 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:53:30,701 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:53:30,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:53:30,702 INFO L87 Difference]: Start difference. First operand 10899 states and 17073 transitions. Second operand has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 23:53:31,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:53:31,752 INFO L93 Difference]: Finished difference Result 29116 states and 44698 transitions. [2021-11-12 23:53:31,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:53:31,753 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 147 [2021-11-12 23:53:31,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:53:31,847 INFO L225 Difference]: With dead ends: 29116 [2021-11-12 23:53:31,847 INFO L226 Difference]: Without dead ends: 19863 [2021-11-12 23:53:31,890 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:53:31,891 INFO L933 BasicCegarLoop]: 3255 mSDtfsCounter, 3453 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 323.81ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3453 SdHoareTripleChecker+Valid, 3427 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.37ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 385.88ms IncrementalHoareTripleChecker+Time [2021-11-12 23:53:31,891 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3453 Valid, 3427 Invalid, 291 Unknown, 0 Unchecked, 8.37ms Time], IncrementalHoareTripleChecker [2 Valid, 289 Invalid, 0 Unknown, 0 Unchecked, 385.88ms Time] [2021-11-12 23:53:31,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19863 states. [2021-11-12 23:53:32,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19863 to 19763. [2021-11-12 23:53:32,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19763 states, 16939 states have (on average 1.5419446248302733) internal successors, (26119), 17006 states have internal predecessors, (26119), 1990 states have call successors, (1990), 833 states have call predecessors, (1990), 832 states have return successors, (1988), 1924 states have call predecessors, (1988), 1988 states have call successors, (1988) [2021-11-12 23:53:32,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19763 states to 19763 states and 30097 transitions. [2021-11-12 23:53:32,952 INFO L78 Accepts]: Start accepts. Automaton has 19763 states and 30097 transitions. Word has length 147 [2021-11-12 23:53:32,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:53:32,952 INFO L470 AbstractCegarLoop]: Abstraction has 19763 states and 30097 transitions. [2021-11-12 23:53:32,953 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 23:53:32,953 INFO L276 IsEmpty]: Start isEmpty. Operand 19763 states and 30097 transitions. [2021-11-12 23:53:33,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-12 23:53:33,016 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:53:33,016 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:53:33,017 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-12 23:53:33,017 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:53:33,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:53:33,017 INFO L85 PathProgramCache]: Analyzing trace with hash -125961756, now seen corresponding path program 1 times [2021-11-12 23:53:33,018 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:53:33,018 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2779081] [2021-11-12 23:53:33,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:53:33,018 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:53:33,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:53:33,116 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-12 23:53:33,117 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:53:33,117 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2779081] [2021-11-12 23:53:33,117 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2779081] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:53:33,117 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:53:33,118 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-12 23:53:33,118 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2109910881] [2021-11-12 23:53:33,118 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:53:33,118 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:53:33,119 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:53:33,119 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:53:33,119 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:53:33,120 INFO L87 Difference]: Start difference. First operand 19763 states and 30097 transitions. Second operand has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 23:53:34,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:53:34,788 INFO L93 Difference]: Finished difference Result 55420 states and 83738 transitions. [2021-11-12 23:53:34,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:53:34,789 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 147 [2021-11-12 23:53:34,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:53:34,964 INFO L225 Difference]: With dead ends: 55420 [2021-11-12 23:53:34,965 INFO L226 Difference]: Without dead ends: 37303 [2021-11-12 23:53:35,043 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:53:35,045 INFO L933 BasicCegarLoop]: 3255 mSDtfsCounter, 3455 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 312.96ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3455 SdHoareTripleChecker+Valid, 3427 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.64ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 372.99ms IncrementalHoareTripleChecker+Time [2021-11-12 23:53:35,046 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3455 Valid, 3427 Invalid, 291 Unknown, 0 Unchecked, 8.64ms Time], IncrementalHoareTripleChecker [2 Valid, 289 Invalid, 0 Unknown, 0 Unchecked, 372.99ms Time] [2021-11-12 23:53:35,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37303 states. [2021-11-12 23:53:36,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37303 to 37107. [2021-11-12 23:53:36,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37107 states, 31595 states have (on average 1.5093210951099858) internal successors, (47687), 31726 states have internal predecessors, (47687), 3846 states have call successors, (3846), 1665 states have call predecessors, (3846), 1664 states have return successors, (3844), 3716 states have call predecessors, (3844), 3844 states have call successors, (3844) [2021-11-12 23:53:36,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37107 states to 37107 states and 55377 transitions. [2021-11-12 23:53:36,658 INFO L78 Accepts]: Start accepts. Automaton has 37107 states and 55377 transitions. Word has length 147 [2021-11-12 23:53:36,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:53:36,659 INFO L470 AbstractCegarLoop]: Abstraction has 37107 states and 55377 transitions. [2021-11-12 23:53:36,659 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 23:53:36,660 INFO L276 IsEmpty]: Start isEmpty. Operand 37107 states and 55377 transitions. [2021-11-12 23:53:36,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-12 23:53:36,762 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:53:36,763 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:53:36,763 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-12 23:53:36,763 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:53:36,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:53:36,764 INFO L85 PathProgramCache]: Analyzing trace with hash 1071392994, now seen corresponding path program 1 times [2021-11-12 23:53:36,764 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:53:36,764 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1204743250] [2021-11-12 23:53:36,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:53:36,765 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:53:36,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:53:36,841 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-12 23:53:36,842 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:53:36,842 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1204743250] [2021-11-12 23:53:36,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1204743250] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:53:36,843 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:53:36,843 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-12 23:53:36,843 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1805078102] [2021-11-12 23:53:36,843 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:53:36,844 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:53:36,844 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:53:36,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:53:36,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:53:36,845 INFO L87 Difference]: Start difference. First operand 37107 states and 55377 transitions. Second operand has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 23:53:39,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:53:39,552 INFO L93 Difference]: Finished difference Result 106876 states and 159450 transitions. [2021-11-12 23:53:39,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:53:39,553 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 147 [2021-11-12 23:53:39,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:53:39,872 INFO L225 Difference]: With dead ends: 106876 [2021-11-12 23:53:39,873 INFO L226 Difference]: Without dead ends: 71415 [2021-11-12 23:53:40,167 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:53:40,168 INFO L933 BasicCegarLoop]: 3270 mSDtfsCounter, 3458 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 290 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 300.09ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3458 SdHoareTripleChecker+Valid, 3442 SdHoareTripleChecker+Invalid, 292 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.08ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 364.61ms IncrementalHoareTripleChecker+Time [2021-11-12 23:53:40,169 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3458 Valid, 3442 Invalid, 292 Unknown, 0 Unchecked, 7.08ms Time], IncrementalHoareTripleChecker [2 Valid, 290 Invalid, 0 Unknown, 0 Unchecked, 364.61ms Time] [2021-11-12 23:53:40,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71415 states. [2021-11-12 23:53:42,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71415 to 71027. [2021-11-12 23:53:42,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71027 states, 60267 states have (on average 1.485771649493089) internal successors, (89543), 60526 states have internal predecessors, (89543), 7430 states have call successors, (7430), 3329 states have call predecessors, (7430), 3328 states have return successors, (7428), 7172 states have call predecessors, (7428), 7428 states have call successors, (7428) [2021-11-12 23:53:43,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71027 states to 71027 states and 104401 transitions. [2021-11-12 23:53:43,053 INFO L78 Accepts]: Start accepts. Automaton has 71027 states and 104401 transitions. Word has length 147 [2021-11-12 23:53:43,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:53:43,053 INFO L470 AbstractCegarLoop]: Abstraction has 71027 states and 104401 transitions. [2021-11-12 23:53:43,054 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 23:53:43,054 INFO L276 IsEmpty]: Start isEmpty. Operand 71027 states and 104401 transitions. [2021-11-12 23:53:43,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2021-11-12 23:53:43,624 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:53:43,624 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-12 23:53:43,625 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-12 23:53:43,625 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:53:43,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:53:43,626 INFO L85 PathProgramCache]: Analyzing trace with hash -1576667521, now seen corresponding path program 1 times [2021-11-12 23:53:43,626 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:53:43,626 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1696122617] [2021-11-12 23:53:43,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:53:43,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:53:43,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:53:43,721 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-12 23:53:43,722 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:53:43,722 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1696122617] [2021-11-12 23:53:43,722 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1696122617] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:53:43,722 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:53:43,722 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-12 23:53:43,723 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2108195109] [2021-11-12 23:53:43,723 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:53:43,723 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:53:43,724 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:53:43,724 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:53:43,724 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:53:43,725 INFO L87 Difference]: Start difference. First operand 71027 states and 104401 transitions. Second operand has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 3 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-12 23:53:47,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:53:47,818 INFO L93 Difference]: Finished difference Result 184187 states and 274647 transitions. [2021-11-12 23:53:47,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:53:47,825 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 3 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 168 [2021-11-12 23:53:47,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:53:48,368 INFO L225 Difference]: With dead ends: 184187 [2021-11-12 23:53:48,368 INFO L226 Difference]: Without dead ends: 114807 [2021-11-12 23:53:48,565 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:53:48,566 INFO L933 BasicCegarLoop]: 3285 mSDtfsCounter, 109 mSDsluCounter, 3486 mSDsCounter, 0 mSdLazyCounter, 505 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 337.03ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 6528 SdHoareTripleChecker+Invalid, 508 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 9.24ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 505 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 411.63ms IncrementalHoareTripleChecker+Time [2021-11-12 23:53:48,567 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 6528 Invalid, 508 Unknown, 0 Unchecked, 9.24ms Time], IncrementalHoareTripleChecker [3 Valid, 505 Invalid, 0 Unknown, 0 Unchecked, 411.63ms Time] [2021-11-12 23:53:48,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114807 states. [2021-11-12 23:53:52,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114807 to 100731. [2021-11-12 23:53:52,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100731 states, 88431 states have (on average 1.551073718492384) internal successors, (137163), 88691 states have internal predecessors, (137163), 8200 states have call successors, (8200), 4099 states have call predecessors, (8200), 4098 states have return successors, (8198), 7941 states have call predecessors, (8198), 8198 states have call successors, (8198) [2021-11-12 23:53:53,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100731 states to 100731 states and 153561 transitions. [2021-11-12 23:53:53,073 INFO L78 Accepts]: Start accepts. Automaton has 100731 states and 153561 transitions. Word has length 168 [2021-11-12 23:53:53,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:53:53,074 INFO L470 AbstractCegarLoop]: Abstraction has 100731 states and 153561 transitions. [2021-11-12 23:53:53,075 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 3 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-12 23:53:53,075 INFO L276 IsEmpty]: Start isEmpty. Operand 100731 states and 153561 transitions. [2021-11-12 23:53:53,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2021-11-12 23:53:53,327 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:53:53,327 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-12 23:53:53,327 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-12 23:53:53,328 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:53:53,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:53:53,328 INFO L85 PathProgramCache]: Analyzing trace with hash 683844783, now seen corresponding path program 2 times [2021-11-12 23:53:53,328 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:53:53,329 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1408466711] [2021-11-12 23:53:53,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:53:53,329 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:53:53,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:53:53,458 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 15 proven. 59 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-12 23:53:53,458 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:53:53,459 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1408466711] [2021-11-12 23:53:53,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1408466711] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:53:53,459 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [283633861] [2021-11-12 23:53:53,459 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 23:53:53,459 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:53:53,459 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:53:53,460 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:53:53,485 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-12 23:53:53,648 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-12 23:53:53,648 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 23:53:53,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 654 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:53:53,656 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:53:53,949 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 76 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-12 23:53:53,949 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:53:54,274 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 21 proven. 0 refuted. 0 times theorem prover too weak. 101 trivial. 0 not checked. [2021-11-12 23:53:54,274 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [283633861] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:53:54,274 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-12 23:53:54,275 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 4] imperfect sequences [6] total 8 [2021-11-12 23:53:54,278 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192667001] [2021-11-12 23:53:54,278 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:53:54,280 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:53:54,281 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:53:54,282 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:53:54,282 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:53:54,283 INFO L87 Difference]: Start difference. First operand 100731 states and 153561 transitions. Second operand has 4 states, 4 states have (on average 27.75) internal successors, (111), 4 states have internal predecessors, (111), 3 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-12 23:53:57,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:53:57,807 INFO L93 Difference]: Finished difference Result 151683 states and 233439 transitions. [2021-11-12 23:53:57,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 23:53:57,808 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 27.75) internal successors, (111), 4 states have internal predecessors, (111), 3 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) Word has length 168 [2021-11-12 23:53:57,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:53:58,468 INFO L225 Difference]: With dead ends: 151683 [2021-11-12 23:53:58,468 INFO L226 Difference]: Without dead ends: 100991 [2021-11-12 23:53:58,571 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 348 GetRequests, 342 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:53:58,572 INFO L933 BasicCegarLoop]: 3402 mSDtfsCounter, 3652 mSDsluCounter, 3598 mSDsCounter, 0 mSdLazyCounter, 654 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 407.27ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3652 SdHoareTripleChecker+Valid, 6722 SdHoareTripleChecker+Invalid, 659 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 15.09ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 654 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 587.74ms IncrementalHoareTripleChecker+Time [2021-11-12 23:53:58,572 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3652 Valid, 6722 Invalid, 659 Unknown, 0 Unchecked, 15.09ms Time], IncrementalHoareTripleChecker [5 Valid, 654 Invalid, 0 Unknown, 0 Unchecked, 587.74ms Time] [2021-11-12 23:53:58,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100991 states. [2021-11-12 23:54:01,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100991 to 99707. [2021-11-12 23:54:01,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99707 states, 87407 states have (on average 1.5370279268250826) internal successors, (134347), 87667 states have internal predecessors, (134347), 8200 states have call successors, (8200), 4099 states have call predecessors, (8200), 4098 states have return successors, (8198), 7941 states have call predecessors, (8198), 8198 states have call successors, (8198) [2021-11-12 23:54:01,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99707 states to 99707 states and 150745 transitions. [2021-11-12 23:54:01,962 INFO L78 Accepts]: Start accepts. Automaton has 99707 states and 150745 transitions. Word has length 168 [2021-11-12 23:54:01,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:54:01,962 INFO L470 AbstractCegarLoop]: Abstraction has 99707 states and 150745 transitions. [2021-11-12 23:54:01,962 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 27.75) internal successors, (111), 4 states have internal predecessors, (111), 3 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-12 23:54:01,963 INFO L276 IsEmpty]: Start isEmpty. Operand 99707 states and 150745 transitions. [2021-11-12 23:54:02,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2021-11-12 23:54:02,220 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:54:02,221 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:54:02,255 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-12 23:54:02,449 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-12 23:54:02,449 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:54:02,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:54:02,450 INFO L85 PathProgramCache]: Analyzing trace with hash 1657333742, now seen corresponding path program 1 times [2021-11-12 23:54:02,450 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:54:02,450 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1764428196] [2021-11-12 23:54:02,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:54:02,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:54:02,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:54:02,624 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 15 proven. 57 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-12 23:54:02,625 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:54:02,625 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1764428196] [2021-11-12 23:54:02,625 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1764428196] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:54:02,625 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1287433878] [2021-11-12 23:54:02,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:54:02,626 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:54:02,626 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:54:02,627 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:54:02,646 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d6306cd-4aa4-48e7-b0c1-b4699b040c32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-12 23:54:02,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:54:02,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 1003 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:54:02,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:54:03,181 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 91 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-12 23:54:03,182 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:54:03,853 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-11-12 23:54:03,853 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1287433878] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:54:03,853 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-12 23:54:03,853 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [6] total 8 [2021-11-12 23:54:03,854 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418283651] [2021-11-12 23:54:03,854 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:54:03,854 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:54:03,854 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:54:03,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:54:03,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:54:03,855 INFO L87 Difference]: Start difference. First operand 99707 states and 150745 transitions. Second operand has 4 states, 4 states have (on average 33.5) internal successors, (134), 4 states have internal predecessors, (134), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) [2021-11-12 23:54:08,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:54:08,659 INFO L93 Difference]: Finished difference Result 199683 states and 301535 transitions. [2021-11-12 23:54:08,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 23:54:08,659 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 33.5) internal successors, (134), 4 states have internal predecessors, (134), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) Word has length 168 [2021-11-12 23:54:08,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted.