./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/token_ring.14.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/token_ring.14.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P --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 78a96934dff25285973ef889167a345947d7e73ab8a2ec405d96bd61e690530f --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:49:56,029 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:49:56,033 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:49:56,098 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:49:56,099 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:49:56,104 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:49:56,106 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:49:56,111 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:49:56,114 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:49:56,121 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:49:56,123 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:49:56,125 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:49:56,126 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:49:56,129 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:49:56,132 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:49:56,136 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:49:56,138 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:49:56,140 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:49:56,143 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:49:56,152 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:49:56,154 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:49:56,156 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:49:56,160 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:49:56,162 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:49:56,173 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:49:56,173 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:49:56,174 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:49:56,176 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:49:56,177 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:49:56,179 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:49:56,180 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:49:56,181 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:49:56,184 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:49:56,185 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:49:56,187 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:49:56,188 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:49:56,189 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:49:56,189 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:49:56,190 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:49:56,191 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:49:56,192 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:49:56,193 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:49:56,245 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:49:56,246 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:49:56,247 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:49:56,247 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:49:56,248 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:49:56,249 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:49:56,249 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:49:56,249 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:49:56,250 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:49:56,250 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:49:56,252 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:49:56,252 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:49:56,252 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:49:56,253 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:49:56,253 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:49:56,253 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:49:56,254 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:49:56,254 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:49:56,256 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:49:56,256 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:49:56,257 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:49:56,257 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:49:56,257 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:49:56,258 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:49:56,258 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:49:56,258 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:49:56,260 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:49:56,261 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:49:56,261 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:49:56,262 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:49:56,262 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:49:56,262 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:49:56,263 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:49:56,263 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:49:56,264 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:49:56,264 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:49:56,264 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:49:56,265 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:49:56,265 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:49:56,265 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:49:56,266 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:49:56,266 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_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 78a96934dff25285973ef889167a345947d7e73ab8a2ec405d96bd61e690530f [2021-11-21 01:49:56,640 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:49:56,683 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:49:56,686 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:49:56,689 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:49:56,690 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:49:56,692 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/systemc/token_ring.14.cil.c [2021-11-21 01:49:56,777 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/data/fe4e6f3a1/e621323e28c2472e89f6f4f0ac13d550/FLAGa0fa1f87f [2021-11-21 01:49:57,436 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:49:57,437 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/sv-benchmarks/c/systemc/token_ring.14.cil.c [2021-11-21 01:49:57,458 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/data/fe4e6f3a1/e621323e28c2472e89f6f4f0ac13d550/FLAGa0fa1f87f [2021-11-21 01:49:57,729 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/data/fe4e6f3a1/e621323e28c2472e89f6f4f0ac13d550 [2021-11-21 01:49:57,733 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:49:57,734 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:49:57,738 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:49:57,741 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:49:57,746 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:49:57,747 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:49:57" (1/1) ... [2021-11-21 01:49:57,748 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5bde5ac5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:49:57, skipping insertion in model container [2021-11-21 01:49:57,749 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:49:57" (1/1) ... [2021-11-21 01:49:57,758 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:49:57,819 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:49:58,049 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/sv-benchmarks/c/systemc/token_ring.14.cil.c[669,682] [2021-11-21 01:49:58,254 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:49:58,266 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:49:58,281 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/sv-benchmarks/c/systemc/token_ring.14.cil.c[669,682] [2021-11-21 01:49:58,373 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:49:58,400 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:49:58,400 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:49:58 WrapperNode [2021-11-21 01:49:58,401 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:49:58,402 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:49:58,402 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:49:58,402 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:49:58,412 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:49:58" (1/1) ... [2021-11-21 01:49:58,429 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:49:58" (1/1) ... [2021-11-21 01:49:58,519 INFO L137 Inliner]: procedures = 52, calls = 68, calls flagged for inlining = 35, calls inlined = 35, statements flattened = 856 [2021-11-21 01:49:58,519 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:49:58,520 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:49:58,521 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:49:58,521 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:49:58,532 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:49:58" (1/1) ... [2021-11-21 01:49:58,532 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:49:58" (1/1) ... [2021-11-21 01:49:58,538 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:49:58" (1/1) ... [2021-11-21 01:49:58,538 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:49:58" (1/1) ... [2021-11-21 01:49:58,557 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:49:58" (1/1) ... [2021-11-21 01:49:58,585 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:49:58" (1/1) ... [2021-11-21 01:49:58,589 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:49:58" (1/1) ... [2021-11-21 01:49:58,620 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:49:58,621 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:49:58,622 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:49:58,622 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:49:58,623 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:49:58" (1/1) ... [2021-11-21 01:49:58,633 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:49:58,649 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:49:58,672 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:49:58,693 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:49:58,743 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:49:58,744 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-21 01:49:58,744 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-21 01:49:58,744 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-21 01:49:58,745 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-21 01:49:58,745 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-21 01:49:58,745 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-21 01:49:58,745 INFO L130 BoogieDeclarations]: Found specification of procedure error [2021-11-21 01:49:58,745 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2021-11-21 01:49:58,746 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-21 01:49:58,746 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-21 01:49:58,746 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-21 01:49:58,746 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-21 01:49:58,746 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-21 01:49:58,747 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-21 01:49:58,747 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:49:58,747 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:49:58,747 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:49:58,967 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:49:58,970 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:50:00,188 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:50:00,776 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:50:00,776 INFO L301 CfgBuilder]: Removed 15 assume(true) statements. [2021-11-21 01:50:00,780 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:50:00 BoogieIcfgContainer [2021-11-21 01:50:00,781 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:50:00,783 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:50:00,783 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:50:00,788 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:50:00,788 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:49:57" (1/3) ... [2021-11-21 01:50:00,789 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b391e7b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:50:00, skipping insertion in model container [2021-11-21 01:50:00,789 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:49:58" (2/3) ... [2021-11-21 01:50:00,790 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b391e7b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:50:00, skipping insertion in model container [2021-11-21 01:50:00,790 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:50:00" (3/3) ... [2021-11-21 01:50:00,792 INFO L111 eAbstractionObserver]: Analyzing ICFG token_ring.14.cil.c [2021-11-21 01:50:00,803 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:50:00,803 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:50:00,885 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:50:00,898 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 [2021-11-21 01:50:00,899 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:50:00,948 INFO L276 IsEmpty]: Start isEmpty. Operand has 194 states, 157 states have (on average 1.5668789808917198) internal successors, (246), 161 states have internal predecessors, (246), 28 states have call successors, (28), 7 states have call predecessors, (28), 7 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) [2021-11-21 01:50:00,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-21 01:50:00,962 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:00,964 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:50:00,965 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:50:00,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:00,972 INFO L85 PathProgramCache]: Analyzing trace with hash 505210802, now seen corresponding path program 1 times [2021-11-21 01:50:00,984 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:00,984 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [213854251] [2021-11-21 01:50:00,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:00,986 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:01,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:01,612 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:50:01,613 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:01,613 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [213854251] [2021-11-21 01:50:01,614 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [213854251] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:50:01,614 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:50:01,615 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 01:50:01,617 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496284687] [2021-11-21 01:50:01,618 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:50:01,628 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:50:01,630 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:01,676 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:50:01,678 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:50:01,684 INFO L87 Difference]: Start difference. First operand has 194 states, 157 states have (on average 1.5668789808917198) internal successors, (246), 161 states have internal predecessors, (246), 28 states have call successors, (28), 7 states have call predecessors, (28), 7 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) Second operand has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 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) [2021-11-21 01:50:02,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:02,435 INFO L93 Difference]: Finished difference Result 558 states and 902 transitions. [2021-11-21 01:50:02,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:50:02,438 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 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 67 [2021-11-21 01:50:02,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:02,466 INFO L225 Difference]: With dead ends: 558 [2021-11-21 01:50:02,466 INFO L226 Difference]: Without dead ends: 365 [2021-11-21 01:50:02,478 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 [2021-11-21 01:50:02,484 INFO L933 BasicCegarLoop]: 462 mSDtfsCounter, 516 mSDsluCounter, 455 mSDsCounter, 0 mSdLazyCounter, 298 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 516 SdHoareTripleChecker+Valid, 824 SdHoareTripleChecker+Invalid, 311 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 298 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:02,485 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [516 Valid, 824 Invalid, 311 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 298 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 01:50:02,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 365 states. [2021-11-21 01:50:02,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 365 to 364. [2021-11-21 01:50:02,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 364 states, 301 states have (on average 1.521594684385382) internal successors, (458), 304 states have internal predecessors, (458), 50 states have call successors, (50), 13 states have call predecessors, (50), 12 states have return successors, (48), 47 states have call predecessors, (48), 48 states have call successors, (48) [2021-11-21 01:50:02,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 556 transitions. [2021-11-21 01:50:02,589 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 556 transitions. Word has length 67 [2021-11-21 01:50:02,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:02,589 INFO L470 AbstractCegarLoop]: Abstraction has 364 states and 556 transitions. [2021-11-21 01:50:02,590 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 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) [2021-11-21 01:50:02,590 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 556 transitions. [2021-11-21 01:50:02,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-21 01:50:02,602 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:02,603 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, 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] [2021-11-21 01:50:02,603 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:50:02,604 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:50:02,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:02,605 INFO L85 PathProgramCache]: Analyzing trace with hash 1004924443, now seen corresponding path program 1 times [2021-11-21 01:50:02,605 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:02,606 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [705520335] [2021-11-21 01:50:02,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:02,606 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:02,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:02,892 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:50:02,895 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:02,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [705520335] [2021-11-21 01:50:02,896 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [705520335] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:02,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1659232486] [2021-11-21 01:50:02,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:02,898 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:02,898 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:02,909 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:02,935 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:50:03,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:03,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 999 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 01:50:03,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:03,635 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-21 01:50:03,636 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:50:03,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1659232486] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:50:03,636 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:50:03,637 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-21 01:50:03,638 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1119164665] [2021-11-21 01:50:03,638 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:50:03,640 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:50:03,640 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:03,641 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:50:03,641 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:50:03,642 INFO L87 Difference]: Start difference. First operand 364 states and 556 transitions. Second operand has 3 states, 3 states have (on average 34.0) internal successors, (102), 2 states have internal predecessors, (102), 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) [2021-11-21 01:50:03,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:03,840 INFO L93 Difference]: Finished difference Result 1075 states and 1671 transitions. [2021-11-21 01:50:03,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:50:03,841 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.0) internal successors, (102), 2 states have internal predecessors, (102), 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 136 [2021-11-21 01:50:03,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:03,852 INFO L225 Difference]: With dead ends: 1075 [2021-11-21 01:50:03,852 INFO L226 Difference]: Without dead ends: 716 [2021-11-21 01:50:03,855 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:50:03,857 INFO L933 BasicCegarLoop]: 304 mSDtfsCounter, 248 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 248 SdHoareTripleChecker+Valid, 537 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:03,858 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [248 Valid, 537 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:50:03,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 716 states. [2021-11-21 01:50:03,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 716 to 710. [2021-11-21 01:50:03,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 710 states, 593 states have (on average 1.5193929173693086) internal successors, (901), 597 states have internal predecessors, (901), 92 states have call successors, (92), 25 states have call predecessors, (92), 24 states have return successors, (90), 88 states have call predecessors, (90), 90 states have call successors, (90) [2021-11-21 01:50:03,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 710 states to 710 states and 1083 transitions. [2021-11-21 01:50:03,949 INFO L78 Accepts]: Start accepts. Automaton has 710 states and 1083 transitions. Word has length 136 [2021-11-21 01:50:03,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:03,950 INFO L470 AbstractCegarLoop]: Abstraction has 710 states and 1083 transitions. [2021-11-21 01:50:03,951 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.0) internal successors, (102), 2 states have internal predecessors, (102), 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) [2021-11-21 01:50:03,951 INFO L276 IsEmpty]: Start isEmpty. Operand 710 states and 1083 transitions. [2021-11-21 01:50:03,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-21 01:50:03,957 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:03,957 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, 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] [2021-11-21 01:50:04,007 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:50:04,183 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:04,183 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:50:04,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:04,184 INFO L85 PathProgramCache]: Analyzing trace with hash 1033810683, now seen corresponding path program 1 times [2021-11-21 01:50:04,184 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:04,185 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1294615567] [2021-11-21 01:50:04,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:04,185 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:04,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:04,451 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:50:04,452 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:04,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1294615567] [2021-11-21 01:50:04,453 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1294615567] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:04,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1893883851] [2021-11-21 01:50:04,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:04,454 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:04,454 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:04,455 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:04,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:50:04,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:04,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 993 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 01:50:04,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:05,051 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-21 01:50:05,051 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:50:05,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1893883851] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:50:05,051 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:50:05,052 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-21 01:50:05,052 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398371920] [2021-11-21 01:50:05,052 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:50:05,053 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:50:05,053 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:05,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:50:05,054 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:50:05,055 INFO L87 Difference]: Start difference. First operand 710 states and 1083 transitions. Second operand has 3 states, 3 states have (on average 30.0) internal successors, (90), 2 states have internal predecessors, (90), 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) [2021-11-21 01:50:05,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:05,283 INFO L93 Difference]: Finished difference Result 2107 states and 3270 transitions. [2021-11-21 01:50:05,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:50:05,284 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 2 states have internal predecessors, (90), 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 136 [2021-11-21 01:50:05,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:05,299 INFO L225 Difference]: With dead ends: 2107 [2021-11-21 01:50:05,299 INFO L226 Difference]: Without dead ends: 1402 [2021-11-21 01:50:05,304 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:50:05,306 INFO L933 BasicCegarLoop]: 303 mSDtfsCounter, 260 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 260 SdHoareTripleChecker+Valid, 536 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:05,306 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [260 Valid, 536 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:50:05,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1402 states. [2021-11-21 01:50:05,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1402 to 1394. [2021-11-21 01:50:05,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1394 states, 1171 states have (on average 1.515798462852263) internal successors, (1775), 1177 states have internal predecessors, (1775), 174 states have call successors, (174), 49 states have call predecessors, (174), 48 states have return successors, (172), 168 states have call predecessors, (172), 172 states have call successors, (172) [2021-11-21 01:50:05,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1394 states to 1394 states and 2121 transitions. [2021-11-21 01:50:05,464 INFO L78 Accepts]: Start accepts. Automaton has 1394 states and 2121 transitions. Word has length 136 [2021-11-21 01:50:05,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:05,465 INFO L470 AbstractCegarLoop]: Abstraction has 1394 states and 2121 transitions. [2021-11-21 01:50:05,465 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 2 states have internal predecessors, (90), 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) [2021-11-21 01:50:05,466 INFO L276 IsEmpty]: Start isEmpty. Operand 1394 states and 2121 transitions. [2021-11-21 01:50:05,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-21 01:50:05,475 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:05,475 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, 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] [2021-11-21 01:50:05,519 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:50:05,689 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:05,690 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:50:05,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:05,691 INFO L85 PathProgramCache]: Analyzing trace with hash 1861691355, now seen corresponding path program 1 times [2021-11-21 01:50:05,691 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:05,691 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [846933501] [2021-11-21 01:50:05,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:05,692 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:05,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:05,865 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:50:05,866 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:05,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [846933501] [2021-11-21 01:50:05,866 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [846933501] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:05,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [922318815] [2021-11-21 01:50:05,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:05,871 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:05,871 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:05,872 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:05,895 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:50:06,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:06,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 987 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 01:50:06,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:06,523 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:50:06,523 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:50:06,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [922318815] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:50:06,524 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:50:06,525 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-21 01:50:06,526 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677922666] [2021-11-21 01:50:06,526 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:50:06,529 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:50:06,529 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:06,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:50:06,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:50:06,530 INFO L87 Difference]: Start difference. First operand 1394 states and 2121 transitions. Second operand has 3 states, 3 states have (on average 36.0) internal successors, (108), 2 states have internal predecessors, (108), 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) [2021-11-21 01:50:06,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:06,849 INFO L93 Difference]: Finished difference Result 4147 states and 6418 transitions. [2021-11-21 01:50:06,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:50:06,854 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.0) internal successors, (108), 2 states have internal predecessors, (108), 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 136 [2021-11-21 01:50:06,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:06,883 INFO L225 Difference]: With dead ends: 4147 [2021-11-21 01:50:06,883 INFO L226 Difference]: Without dead ends: 2758 [2021-11-21 01:50:06,893 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:50:06,897 INFO L933 BasicCegarLoop]: 263 mSDtfsCounter, 242 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 242 SdHoareTripleChecker+Valid, 496 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:06,899 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [242 Valid, 496 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:50:06,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2758 states. [2021-11-21 01:50:07,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2758 to 2746. [2021-11-21 01:50:07,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2746 states, 2315 states have (on average 1.5114470842332612) internal successors, (3499), 2325 states have internal predecessors, (3499), 334 states have call successors, (334), 97 states have call predecessors, (334), 96 states have return successors, (332), 324 states have call predecessors, (332), 332 states have call successors, (332) [2021-11-21 01:50:07,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2746 states to 2746 states and 4165 transitions. [2021-11-21 01:50:07,148 INFO L78 Accepts]: Start accepts. Automaton has 2746 states and 4165 transitions. Word has length 136 [2021-11-21 01:50:07,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:07,149 INFO L470 AbstractCegarLoop]: Abstraction has 2746 states and 4165 transitions. [2021-11-21 01:50:07,149 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.0) internal successors, (108), 2 states have internal predecessors, (108), 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) [2021-11-21 01:50:07,150 INFO L276 IsEmpty]: Start isEmpty. Operand 2746 states and 4165 transitions. [2021-11-21 01:50:07,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-21 01:50:07,161 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:07,161 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, 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] [2021-11-21 01:50:07,207 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:50:07,387 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:07,387 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:50:07,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:07,388 INFO L85 PathProgramCache]: Analyzing trace with hash 1214059707, now seen corresponding path program 1 times [2021-11-21 01:50:07,388 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:07,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1032413314] [2021-11-21 01:50:07,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:07,389 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:07,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:07,495 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:50:07,496 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:07,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1032413314] [2021-11-21 01:50:07,496 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1032413314] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:07,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [824451585] [2021-11-21 01:50:07,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:07,497 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:07,497 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:07,498 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:07,519 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:50:07,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:07,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 981 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 01:50:07,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:08,106 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 01:50:08,107 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:50:08,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [824451585] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:50:08,107 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:50:08,107 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-21 01:50:08,108 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117701421] [2021-11-21 01:50:08,108 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:50:08,109 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:50:08,109 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:08,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:50:08,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:50:08,110 INFO L87 Difference]: Start difference. First operand 2746 states and 4165 transitions. Second operand has 3 states, 3 states have (on average 37.0) internal successors, (111), 2 states have internal predecessors, (111), 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) [2021-11-21 01:50:08,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:08,577 INFO L93 Difference]: Finished difference Result 8179 states and 12614 transitions. [2021-11-21 01:50:08,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:50:08,578 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.0) internal successors, (111), 2 states have internal predecessors, (111), 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 136 [2021-11-21 01:50:08,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:08,628 INFO L225 Difference]: With dead ends: 8179 [2021-11-21 01:50:08,628 INFO L226 Difference]: Without dead ends: 5438 [2021-11-21 01:50:08,643 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:50:08,644 INFO L933 BasicCegarLoop]: 263 mSDtfsCounter, 239 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 239 SdHoareTripleChecker+Valid, 496 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:08,645 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [239 Valid, 496 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:50:08,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5438 states. [2021-11-21 01:50:08,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5438 to 5418. [2021-11-21 01:50:08,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5418 states, 4579 states have (on average 1.5066608429788164) internal successors, (6899), 4597 states have internal predecessors, (6899), 646 states have call successors, (646), 193 states have call predecessors, (646), 192 states have return successors, (644), 628 states have call predecessors, (644), 644 states have call successors, (644) [2021-11-21 01:50:09,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5418 states to 5418 states and 8189 transitions. [2021-11-21 01:50:09,029 INFO L78 Accepts]: Start accepts. Automaton has 5418 states and 8189 transitions. Word has length 136 [2021-11-21 01:50:09,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:09,030 INFO L470 AbstractCegarLoop]: Abstraction has 5418 states and 8189 transitions. [2021-11-21 01:50:09,030 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.0) internal successors, (111), 2 states have internal predecessors, (111), 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) [2021-11-21 01:50:09,031 INFO L276 IsEmpty]: Start isEmpty. Operand 5418 states and 8189 transitions. [2021-11-21 01:50:09,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-21 01:50:09,047 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:09,047 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, 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] [2021-11-21 01:50:09,096 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:50:09,265 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:09,266 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:50:09,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:09,266 INFO L85 PathProgramCache]: Analyzing trace with hash -399944741, now seen corresponding path program 1 times [2021-11-21 01:50:09,266 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:09,267 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1608139107] [2021-11-21 01:50:09,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:09,267 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:09,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:09,369 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:50:09,370 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:09,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1608139107] [2021-11-21 01:50:09,370 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1608139107] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:09,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [582557011] [2021-11-21 01:50:09,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:09,371 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:09,371 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:09,372 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:09,395 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:50:09,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:09,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 975 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 01:50:09,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:10,011 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-21 01:50:10,012 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:50:10,012 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [582557011] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:50:10,012 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:50:10,013 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-21 01:50:10,013 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [844866487] [2021-11-21 01:50:10,013 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:50:10,014 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:50:10,014 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:10,014 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:50:10,015 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:50:10,015 INFO L87 Difference]: Start difference. First operand 5418 states and 8189 transitions. Second operand has 3 states, 3 states have (on average 28.0) internal successors, (84), 2 states have internal predecessors, (84), 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) [2021-11-21 01:50:10,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:10,695 INFO L93 Difference]: Finished difference Result 16147 states and 24806 transitions. [2021-11-21 01:50:10,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:50:10,696 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.0) internal successors, (84), 2 states have internal predecessors, (84), 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 136 [2021-11-21 01:50:10,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:10,792 INFO L225 Difference]: With dead ends: 16147 [2021-11-21 01:50:10,792 INFO L226 Difference]: Without dead ends: 10734 [2021-11-21 01:50:10,825 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:50:10,826 INFO L933 BasicCegarLoop]: 289 mSDtfsCounter, 266 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 266 SdHoareTripleChecker+Valid, 522 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:10,826 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [266 Valid, 522 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:50:10,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10734 states. [2021-11-21 01:50:11,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10734 to 10698. [2021-11-21 01:50:11,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10698 states, 9059 states have (on average 1.5016006181697759) internal successors, (13603), 9093 states have internal predecessors, (13603), 1254 states have call successors, (1254), 385 states have call predecessors, (1254), 384 states have return successors, (1252), 1220 states have call predecessors, (1252), 1252 states have call successors, (1252) [2021-11-21 01:50:11,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10698 states to 10698 states and 16109 transitions. [2021-11-21 01:50:11,639 INFO L78 Accepts]: Start accepts. Automaton has 10698 states and 16109 transitions. Word has length 136 [2021-11-21 01:50:11,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:11,639 INFO L470 AbstractCegarLoop]: Abstraction has 10698 states and 16109 transitions. [2021-11-21 01:50:11,640 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.0) internal successors, (84), 2 states have internal predecessors, (84), 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) [2021-11-21 01:50:11,640 INFO L276 IsEmpty]: Start isEmpty. Operand 10698 states and 16109 transitions. [2021-11-21 01:50:11,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-21 01:50:11,670 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:11,670 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, 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] [2021-11-21 01:50:11,719 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:50:11,887 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:11,887 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:50:11,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:11,889 INFO L85 PathProgramCache]: Analyzing trace with hash 1406050491, now seen corresponding path program 1 times [2021-11-21 01:50:11,889 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:11,889 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [848599464] [2021-11-21 01:50:11,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:11,890 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:11,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:12,005 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:50:12,005 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:12,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [848599464] [2021-11-21 01:50:12,006 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [848599464] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:12,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [81834720] [2021-11-21 01:50:12,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:12,007 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:12,007 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:12,008 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:12,031 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:50:12,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:12,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 969 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 01:50:12,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:12,714 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-21 01:50:12,714 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:50:12,715 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [81834720] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:50:12,716 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:50:12,716 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-21 01:50:12,717 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1695974305] [2021-11-21 01:50:12,717 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:50:12,718 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:50:12,718 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:12,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:50:12,719 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:50:12,720 INFO L87 Difference]: Start difference. First operand 10698 states and 16109 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) [2021-11-21 01:50:13,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:13,860 INFO L93 Difference]: Finished difference Result 31891 states and 48790 transitions. [2021-11-21 01:50:13,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:50:13,861 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 136 [2021-11-21 01:50:13,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:14,021 INFO L225 Difference]: With dead ends: 31891 [2021-11-21 01:50:14,022 INFO L226 Difference]: Without dead ends: 21198 [2021-11-21 01:50:14,085 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:50:14,087 INFO L933 BasicCegarLoop]: 299 mSDtfsCounter, 269 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 269 SdHoareTripleChecker+Valid, 532 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:14,087 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [269 Valid, 532 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:50:14,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21198 states. [2021-11-21 01:50:15,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21198 to 21130. [2021-11-21 01:50:15,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21130 states, 17923 states have (on average 1.4963454778775875) internal successors, (26819), 17989 states have internal predecessors, (26819), 2438 states have call successors, (2438), 769 states have call predecessors, (2438), 768 states have return successors, (2436), 2372 states have call predecessors, (2436), 2436 states have call successors, (2436) [2021-11-21 01:50:15,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21130 states to 21130 states and 31693 transitions. [2021-11-21 01:50:15,517 INFO L78 Accepts]: Start accepts. Automaton has 21130 states and 31693 transitions. Word has length 136 [2021-11-21 01:50:15,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:15,522 INFO L470 AbstractCegarLoop]: Abstraction has 21130 states and 31693 transitions. [2021-11-21 01:50:15,524 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) [2021-11-21 01:50:15,524 INFO L276 IsEmpty]: Start isEmpty. Operand 21130 states and 31693 transitions. [2021-11-21 01:50:15,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-21 01:50:15,584 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:15,585 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, 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] [2021-11-21 01:50:15,637 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 01:50:15,811 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:15,811 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:50:15,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:15,812 INFO L85 PathProgramCache]: Analyzing trace with hash 754690011, now seen corresponding path program 1 times [2021-11-21 01:50:15,812 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:15,813 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1447165132] [2021-11-21 01:50:15,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:15,813 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:15,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:15,958 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:50:15,958 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:15,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1447165132] [2021-11-21 01:50:15,959 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1447165132] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:15,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [72908514] [2021-11-21 01:50:15,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:15,960 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:15,960 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:15,961 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:15,995 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:50:16,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:16,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 963 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 01:50:16,262 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:16,613 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-21 01:50:16,613 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:50:16,614 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [72908514] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:50:16,614 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:50:16,614 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-21 01:50:16,615 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [929387651] [2021-11-21 01:50:16,615 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:50:16,616 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:50:16,616 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:16,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:50:16,617 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:50:16,617 INFO L87 Difference]: Start difference. First operand 21130 states and 31693 transitions. Second operand has 3 states, 3 states have (on average 32.0) internal successors, (96), 2 states have internal predecessors, (96), 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) [2021-11-21 01:50:18,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:18,662 INFO L93 Difference]: Finished difference Result 62995 states and 95958 transitions. [2021-11-21 01:50:18,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:50:18,663 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 2 states have internal predecessors, (96), 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 136 [2021-11-21 01:50:18,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:18,934 INFO L225 Difference]: With dead ends: 62995 [2021-11-21 01:50:18,934 INFO L226 Difference]: Without dead ends: 41870 [2021-11-21 01:50:19,020 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:50:19,021 INFO L933 BasicCegarLoop]: 263 mSDtfsCounter, 254 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 496 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:19,021 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [254 Valid, 496 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:50:19,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41870 states. [2021-11-21 01:50:21,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41870 to 41738. [2021-11-21 01:50:21,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41738 states, 35459 states have (on average 1.490933190445303) internal successors, (52867), 35589 states have internal predecessors, (52867), 4742 states have call successors, (4742), 1537 states have call predecessors, (4742), 1536 states have return successors, (4740), 4612 states have call predecessors, (4740), 4740 states have call successors, (4740) [2021-11-21 01:50:21,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41738 states to 41738 states and 62349 transitions. [2021-11-21 01:50:21,930 INFO L78 Accepts]: Start accepts. Automaton has 41738 states and 62349 transitions. Word has length 136 [2021-11-21 01:50:21,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:21,931 INFO L470 AbstractCegarLoop]: Abstraction has 41738 states and 62349 transitions. [2021-11-21 01:50:21,931 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 2 states have internal predecessors, (96), 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) [2021-11-21 01:50:21,931 INFO L276 IsEmpty]: Start isEmpty. Operand 41738 states and 62349 transitions. [2021-11-21 01:50:22,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-21 01:50:22,044 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:22,045 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, 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] [2021-11-21 01:50:22,094 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 01:50:22,259 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:22,259 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:50:22,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:22,260 INFO L85 PathProgramCache]: Analyzing trace with hash -1819982661, now seen corresponding path program 1 times [2021-11-21 01:50:22,260 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:22,260 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [35197315] [2021-11-21 01:50:22,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:22,261 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:22,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:22,483 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-21 01:50:22,484 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:22,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [35197315] [2021-11-21 01:50:22,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [35197315] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:50:22,484 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:50:22,485 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-21 01:50:22,485 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193078379] [2021-11-21 01:50:22,485 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:50:22,486 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 01:50:22,486 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:22,487 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 01:50:22,487 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:50:22,487 INFO L87 Difference]: Start difference. First operand 41738 states and 62349 transitions. Second operand has 6 states, 6 states have (on average 13.0) internal successors, (78), 6 states have internal predecessors, (78), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-21 01:50:27,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:27,873 INFO L93 Difference]: Finished difference Result 145938 states and 217620 transitions. [2021-11-21 01:50:27,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 01:50:27,874 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.0) internal successors, (78), 6 states have internal predecessors, (78), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 136 [2021-11-21 01:50:27,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:28,706 INFO L225 Difference]: With dead ends: 145938 [2021-11-21 01:50:28,707 INFO L226 Difference]: Without dead ends: 104206 [2021-11-21 01:50:29,093 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-21 01:50:29,094 INFO L933 BasicCegarLoop]: 266 mSDtfsCounter, 1082 mSDsluCounter, 726 mSDsCounter, 0 mSdLazyCounter, 371 mSolverCounterSat, 158 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1103 SdHoareTripleChecker+Valid, 874 SdHoareTripleChecker+Invalid, 529 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 158 IncrementalHoareTripleChecker+Valid, 371 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:29,095 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1103 Valid, 874 Invalid, 529 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [158 Valid, 371 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 01:50:29,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104206 states. [2021-11-21 01:50:34,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104206 to 81930. [2021-11-21 01:50:34,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81930 states, 69635 states have (on average 1.485273210310907) internal successors, (103427), 69893 states have internal predecessors, (103427), 9222 states have call successors, (9222), 3073 states have call predecessors, (9222), 3072 states have return successors, (9220), 8964 states have call predecessors, (9220), 9220 states have call successors, (9220) [2021-11-21 01:50:34,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81930 states to 81930 states and 121869 transitions. [2021-11-21 01:50:34,957 INFO L78 Accepts]: Start accepts. Automaton has 81930 states and 121869 transitions. Word has length 136 [2021-11-21 01:50:34,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:34,959 INFO L470 AbstractCegarLoop]: Abstraction has 81930 states and 121869 transitions. [2021-11-21 01:50:34,960 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.0) internal successors, (78), 6 states have internal predecessors, (78), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-21 01:50:34,960 INFO L276 IsEmpty]: Start isEmpty. Operand 81930 states and 121869 transitions. [2021-11-21 01:50:35,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2021-11-21 01:50:35,103 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:35,104 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:50:35,104 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-21 01:50:35,104 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:50:35,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:35,105 INFO L85 PathProgramCache]: Analyzing trace with hash -1660138999, now seen corresponding path program 1 times [2021-11-21 01:50:35,106 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:35,106 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [122987557] [2021-11-21 01:50:35,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:35,106 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:35,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:35,260 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 10 proven. 41 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-21 01:50:35,260 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:35,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [122987557] [2021-11-21 01:50:35,261 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [122987557] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:35,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1264694689] [2021-11-21 01:50:35,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:35,261 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:35,262 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:35,263 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:35,291 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 01:50:35,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:35,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 998 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 01:50:35,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:35,942 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-21 01:50:35,943 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:50:35,943 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1264694689] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:50:35,944 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:50:35,944 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-21 01:50:35,944 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474389178] [2021-11-21 01:50:35,945 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:50:35,946 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:50:35,946 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:35,947 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:50:35,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:50:35,948 INFO L87 Difference]: Start difference. First operand 81930 states and 121869 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-21 01:50:39,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:39,386 INFO L93 Difference]: Finished difference Result 145550 states and 220304 transitions. [2021-11-21 01:50:39,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:50:39,386 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 158 [2021-11-21 01:50:39,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:40,213 INFO L225 Difference]: With dead ends: 145550 [2021-11-21 01:50:40,214 INFO L226 Difference]: Without dead ends: 103562 [2021-11-21 01:50:40,376 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:50:40,378 INFO L933 BasicCegarLoop]: 373 mSDtfsCounter, 125 mSDsluCounter, 298 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 628 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:40,379 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [125 Valid, 628 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:50:40,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103562 states. [2021-11-21 01:50:45,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103562 to 97674. [2021-11-21 01:50:45,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97674 states, 84867 states have (on average 1.5293930503022377) internal successors, (129795), 85125 states have internal predecessors, (129795), 9478 states have call successors, (9478), 3329 states have call predecessors, (9478), 3328 states have return successors, (9476), 9220 states have call predecessors, (9476), 9476 states have call successors, (9476) [2021-11-21 01:50:45,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97674 states to 97674 states and 148749 transitions. [2021-11-21 01:50:45,910 INFO L78 Accepts]: Start accepts. Automaton has 97674 states and 148749 transitions. Word has length 158 [2021-11-21 01:50:45,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:50:45,911 INFO L470 AbstractCegarLoop]: Abstraction has 97674 states and 148749 transitions. [2021-11-21 01:50:45,911 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-21 01:50:45,912 INFO L276 IsEmpty]: Start isEmpty. Operand 97674 states and 148749 transitions. [2021-11-21 01:50:46,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2021-11-21 01:50:46,236 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:50:46,237 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, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:50:46,287 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 01:50:46,463 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:46,463 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:50:46,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:50:46,464 INFO L85 PathProgramCache]: Analyzing trace with hash 1122018212, now seen corresponding path program 1 times [2021-11-21 01:50:46,464 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:50:46,464 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1033106567] [2021-11-21 01:50:46,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:46,465 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:50:46,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:46,657 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 10 proven. 81 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2021-11-21 01:50:46,657 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:50:46,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1033106567] [2021-11-21 01:50:46,658 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1033106567] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:50:46,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1913419739] [2021-11-21 01:50:46,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:50:46,658 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:50:46,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:50:46,660 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:50:46,683 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 01:50:46,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:50:46,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 1262 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 01:50:47,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:50:47,632 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 101 proven. 0 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-21 01:50:47,632 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:50:47,633 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1913419739] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:50:47,633 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:50:47,633 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2021-11-21 01:50:47,633 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156198474] [2021-11-21 01:50:47,634 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:50:47,634 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:50:47,635 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:50:47,635 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:50:47,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:50:47,636 INFO L87 Difference]: Start difference. First operand 97674 states and 148749 transitions. Second operand has 3 states, 3 states have (on average 44.333333333333336) internal successors, (133), 2 states have internal predecessors, (133), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-21 01:50:55,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:50:55,061 INFO L93 Difference]: Finished difference Result 291475 states and 449302 transitions. [2021-11-21 01:50:55,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:50:55,062 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 44.333333333333336) internal successors, (133), 2 states have internal predecessors, (133), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 208 [2021-11-21 01:50:55,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:50:55,965 INFO L225 Difference]: With dead ends: 291475 [2021-11-21 01:50:55,966 INFO L226 Difference]: Without dead ends: 193806 [2021-11-21 01:50:56,316 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 210 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:50:56,317 INFO L933 BasicCegarLoop]: 263 mSDtfsCounter, 194 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 194 SdHoareTripleChecker+Valid, 496 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:50:56,318 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [194 Valid, 496 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:50:56,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193806 states. [2021-11-21 01:51:04,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193806 to 193034. [2021-11-21 01:51:04,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193034 states, 167939 states have (on average 1.5243808763896414) internal successors, (256003), 168453 states have internal predecessors, (256003), 18438 states have call successors, (18438), 6657 states have call predecessors, (18438), 6656 states have return successors, (18436), 17924 states have call predecessors, (18436), 18436 states have call successors, (18436) [2021-11-21 01:51:05,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193034 states to 193034 states and 292877 transitions. [2021-11-21 01:51:05,980 INFO L78 Accepts]: Start accepts. Automaton has 193034 states and 292877 transitions. Word has length 208 [2021-11-21 01:51:05,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:51:05,981 INFO L470 AbstractCegarLoop]: Abstraction has 193034 states and 292877 transitions. [2021-11-21 01:51:05,981 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 44.333333333333336) internal successors, (133), 2 states have internal predecessors, (133), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-21 01:51:05,981 INFO L276 IsEmpty]: Start isEmpty. Operand 193034 states and 292877 transitions. [2021-11-21 01:51:06,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2021-11-21 01:51:06,356 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:51:06,356 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, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:51:06,406 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 01:51:06,571 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:51:06,571 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:51:06,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:51:06,572 INFO L85 PathProgramCache]: Analyzing trace with hash -1006325717, now seen corresponding path program 1 times [2021-11-21 01:51:06,572 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:51:06,572 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [877956337] [2021-11-21 01:51:06,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:51:06,573 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:51:06,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:51:06,726 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 10 proven. 81 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2021-11-21 01:51:06,727 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:51:06,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [877956337] [2021-11-21 01:51:06,727 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [877956337] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:51:06,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1767180869] [2021-11-21 01:51:06,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:51:06,728 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:51:06,728 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:51:06,729 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:51:06,736 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78b37671-fec9-4c47-b1c5-7b18fbaa7bc1/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 01:51:07,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:51:07,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 1262 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 01:51:07,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:51:07,537 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 103 proven. 0 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-21 01:51:07,538 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:51:07,538 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1767180869] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:51:07,538 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:51:07,539 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2021-11-21 01:51:07,539 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1487060966] [2021-11-21 01:51:07,539 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:51:07,540 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:51:07,540 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:51:07,541 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:51:07,541 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:51:07,541 INFO L87 Difference]: Start difference. First operand 193034 states and 292877 transitions. Second operand has 3 states, 3 states have (on average 45.0) internal successors, (135), 2 states have internal predecessors, (135), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10)