./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/token_ring.13.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4e7fbc69 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/token_ring.13.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW --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 1b2c6a3c4af8091017033117c21d8fbc40cee2009788b890a114045d77587077 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-4e7fbc6 [2022-11-23 13:46:09,134 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-23 13:46:09,136 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-23 13:46:09,176 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-23 13:46:09,177 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-23 13:46:09,180 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-23 13:46:09,182 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-23 13:46:09,184 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-23 13:46:09,185 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-23 13:46:09,186 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-23 13:46:09,187 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-23 13:46:09,189 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-23 13:46:09,190 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-23 13:46:09,195 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-23 13:46:09,197 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-23 13:46:09,199 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-23 13:46:09,200 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-23 13:46:09,203 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-23 13:46:09,206 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-23 13:46:09,213 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-23 13:46:09,216 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-23 13:46:09,218 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-23 13:46:09,219 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-23 13:46:09,220 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-23 13:46:09,230 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-23 13:46:09,230 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-23 13:46:09,231 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-23 13:46:09,232 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-23 13:46:09,232 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-23 13:46:09,233 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-23 13:46:09,233 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-23 13:46:09,234 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-23 13:46:09,235 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-23 13:46:09,236 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-23 13:46:09,237 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-23 13:46:09,237 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-23 13:46:09,241 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-23 13:46:09,243 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-23 13:46:09,243 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-23 13:46:09,245 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-23 13:46:09,245 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-23 13:46:09,246 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-23 13:46:09,283 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-23 13:46:09,284 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-23 13:46:09,284 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-23 13:46:09,284 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-23 13:46:09,285 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-23 13:46:09,285 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-23 13:46:09,286 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-23 13:46:09,286 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-23 13:46:09,286 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-23 13:46:09,286 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-23 13:46:09,287 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-23 13:46:09,287 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-23 13:46:09,288 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-23 13:46:09,288 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-23 13:46:09,288 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-23 13:46:09,288 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-23 13:46:09,288 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-23 13:46:09,288 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-23 13:46:09,289 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-23 13:46:09,289 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-23 13:46:09,290 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-23 13:46:09,290 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-23 13:46:09,290 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-23 13:46:09,290 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-23 13:46:09,290 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-23 13:46:09,290 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-23 13:46:09,291 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-23 13:46:09,291 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-23 13:46:09,291 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-23 13:46:09,291 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-23 13:46:09,292 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-23 13:46:09,292 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-23 13:46:09,292 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 13:46:09,292 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-23 13:46:09,292 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-23 13:46:09,293 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-23 13:46:09,293 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-23 13:46:09,293 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-23 13:46:09,294 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-23 13:46:09,294 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-23 13:46:09,294 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-23 13:46:09,294 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1b2c6a3c4af8091017033117c21d8fbc40cee2009788b890a114045d77587077 [2022-11-23 13:46:09,564 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-23 13:46:09,592 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-23 13:46:09,596 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-23 13:46:09,597 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-23 13:46:09,598 INFO L275 PluginConnector]: CDTParser initialized [2022-11-23 13:46:09,599 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/../../sv-benchmarks/c/systemc/token_ring.13.cil-1.c [2022-11-23 13:46:12,686 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-23 13:46:12,998 INFO L351 CDTParser]: Found 1 translation units. [2022-11-23 13:46:12,999 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/sv-benchmarks/c/systemc/token_ring.13.cil-1.c [2022-11-23 13:46:13,011 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/data/15a3956a8/3fb3249123f74763a3bc6e1f67dc6721/FLAGd6aaee976 [2022-11-23 13:46:13,025 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/data/15a3956a8/3fb3249123f74763a3bc6e1f67dc6721 [2022-11-23 13:46:13,028 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-23 13:46:13,029 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-23 13:46:13,031 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-23 13:46:13,031 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-23 13:46:13,035 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-23 13:46:13,036 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 01:46:13" (1/1) ... [2022-11-23 13:46:13,037 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@248777b2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:46:13, skipping insertion in model container [2022-11-23 13:46:13,037 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 01:46:13" (1/1) ... [2022-11-23 13:46:13,045 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-23 13:46:13,094 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-23 13:46:13,239 WARN L237 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_83a01645-bdc2-4c73-9f22-ae114b7a1668/sv-benchmarks/c/systemc/token_ring.13.cil-1.c[671,684] [2022-11-23 13:46:13,415 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 13:46:13,451 INFO L203 MainTranslator]: Completed pre-run [2022-11-23 13:46:13,464 WARN L237 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_83a01645-bdc2-4c73-9f22-ae114b7a1668/sv-benchmarks/c/systemc/token_ring.13.cil-1.c[671,684] [2022-11-23 13:46:13,588 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 13:46:13,624 INFO L208 MainTranslator]: Completed translation [2022-11-23 13:46:13,624 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:46:13 WrapperNode [2022-11-23 13:46:13,624 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-23 13:46:13,625 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-23 13:46:13,625 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-23 13:46:13,625 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-23 13:46:13,632 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:46:13" (1/1) ... [2022-11-23 13:46:13,647 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:46:13" (1/1) ... [2022-11-23 13:46:13,717 INFO L138 Inliner]: procedures = 54, calls = 71, calls flagged for inlining = 37, calls inlined = 37, statements flattened = 916 [2022-11-23 13:46:13,718 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-23 13:46:13,718 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-23 13:46:13,719 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-23 13:46:13,719 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-23 13:46:13,748 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:46:13" (1/1) ... [2022-11-23 13:46:13,750 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:46:13" (1/1) ... [2022-11-23 13:46:13,755 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:46:13" (1/1) ... [2022-11-23 13:46:13,770 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:46:13" (1/1) ... [2022-11-23 13:46:13,783 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:46:13" (1/1) ... [2022-11-23 13:46:13,812 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:46:13" (1/1) ... [2022-11-23 13:46:13,820 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:46:13" (1/1) ... [2022-11-23 13:46:13,823 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:46:13" (1/1) ... [2022-11-23 13:46:13,834 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-23 13:46:13,838 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-23 13:46:13,839 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-23 13:46:13,839 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-23 13:46:13,840 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:46:13" (1/1) ... [2022-11-23 13:46:13,846 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 13:46:13,858 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:46:13,881 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-23 13:46:13,894 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-23 13:46:13,938 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-23 13:46:13,938 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2022-11-23 13:46:13,938 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2022-11-23 13:46:13,939 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2022-11-23 13:46:13,939 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2022-11-23 13:46:13,939 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2022-11-23 13:46:13,939 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2022-11-23 13:46:13,939 INFO L130 BoogieDeclarations]: Found specification of procedure error [2022-11-23 13:46:13,939 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2022-11-23 13:46:13,940 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2022-11-23 13:46:13,940 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2022-11-23 13:46:13,940 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2022-11-23 13:46:13,940 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2022-11-23 13:46:13,940 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2022-11-23 13:46:13,941 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2022-11-23 13:46:13,941 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-23 13:46:13,941 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-23 13:46:13,941 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-23 13:46:14,142 INFO L235 CfgBuilder]: Building ICFG [2022-11-23 13:46:14,144 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-23 13:46:15,207 INFO L276 CfgBuilder]: Performing block encoding [2022-11-23 13:46:15,907 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-23 13:46:15,908 INFO L300 CfgBuilder]: Removed 16 assume(true) statements. [2022-11-23 13:46:15,911 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 01:46:15 BoogieIcfgContainer [2022-11-23 13:46:15,912 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-23 13:46:15,914 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-23 13:46:15,915 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-23 13:46:15,918 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-23 13:46:15,918 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 01:46:13" (1/3) ... [2022-11-23 13:46:15,920 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@350ea68c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 01:46:15, skipping insertion in model container [2022-11-23 13:46:15,920 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:46:13" (2/3) ... [2022-11-23 13:46:15,921 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@350ea68c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 01:46:15, skipping insertion in model container [2022-11-23 13:46:15,922 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 01:46:15" (3/3) ... [2022-11-23 13:46:15,926 INFO L112 eAbstractionObserver]: Analyzing ICFG token_ring.13.cil-1.c [2022-11-23 13:46:15,945 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-23 13:46:15,946 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-23 13:46:16,015 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-23 13:46:16,022 INFO L357 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@c46156c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-23 13:46:16,022 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-23 13:46:16,028 INFO L276 IsEmpty]: Start isEmpty. Operand has 205 states, 167 states have (on average 1.5688622754491017) internal successors, (262), 171 states have internal predecessors, (262), 29 states have call successors, (29), 7 states have call predecessors, (29), 7 states have return successors, (29), 28 states have call predecessors, (29), 29 states have call successors, (29) [2022-11-23 13:46:16,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-11-23 13:46:16,044 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:46:16,044 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:46:16,045 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:46:16,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:46:16,050 INFO L85 PathProgramCache]: Analyzing trace with hash -1630160683, now seen corresponding path program 1 times [2022-11-23 13:46:16,060 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:46:16,061 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1132930074] [2022-11-23 13:46:16,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:46:16,062 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:46:16,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:46:16,699 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 13:46:16,699 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:46:16,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1132930074] [2022-11-23 13:46:16,701 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1132930074] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:46:16,701 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 13:46:16,701 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-23 13:46:16,703 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142362537] [2022-11-23 13:46:16,703 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:46:16,708 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-23 13:46:16,708 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:46:16,741 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-23 13:46:16,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 13:46:16,747 INFO L87 Difference]: Start difference. First operand has 205 states, 167 states have (on average 1.5688622754491017) internal successors, (262), 171 states have internal predecessors, (262), 29 states have call successors, (29), 7 states have call predecessors, (29), 7 states have return successors, (29), 28 states have call predecessors, (29), 29 states have call successors, (29) Second operand has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 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) [2022-11-23 13:46:17,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:46:17,348 INFO L93 Difference]: Finished difference Result 591 states and 958 transitions. [2022-11-23 13:46:17,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 13:46:17,351 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 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 70 [2022-11-23 13:46:17,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:46:17,363 INFO L225 Difference]: With dead ends: 591 [2022-11-23 13:46:17,363 INFO L226 Difference]: Without dead ends: 387 [2022-11-23 13:46:17,368 INFO L412 NwaCegarLoop]: 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 [2022-11-23 13:46:17,372 INFO L413 NwaCegarLoop]: 491 mSDtfsCounter, 549 mSDsluCounter, 387 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 549 SdHoareTripleChecker+Valid, 878 SdHoareTripleChecker+Invalid, 329 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-23 13:46:17,373 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [549 Valid, 878 Invalid, 329 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-23 13:46:17,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2022-11-23 13:46:17,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 386. [2022-11-23 13:46:17,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 386 states, 321 states have (on average 1.5264797507788161) internal successors, (490), 324 states have internal predecessors, (490), 52 states have call successors, (52), 13 states have call predecessors, (52), 12 states have return successors, (50), 49 states have call predecessors, (50), 50 states have call successors, (50) [2022-11-23 13:46:17,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 386 states to 386 states and 592 transitions. [2022-11-23 13:46:17,457 INFO L78 Accepts]: Start accepts. Automaton has 386 states and 592 transitions. Word has length 70 [2022-11-23 13:46:17,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:46:17,458 INFO L495 AbstractCegarLoop]: Abstraction has 386 states and 592 transitions. [2022-11-23 13:46:17,458 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 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) [2022-11-23 13:46:17,459 INFO L276 IsEmpty]: Start isEmpty. Operand 386 states and 592 transitions. [2022-11-23 13:46:17,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2022-11-23 13:46:17,476 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:46:17,476 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:46:17,476 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-23 13:46:17,477 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:46:17,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:46:17,477 INFO L85 PathProgramCache]: Analyzing trace with hash -1138477103, now seen corresponding path program 1 times [2022-11-23 13:46:17,478 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:46:17,478 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1602405116] [2022-11-23 13:46:17,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:46:17,482 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:46:17,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:46:17,981 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-23 13:46:17,981 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:46:17,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1602405116] [2022-11-23 13:46:17,982 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1602405116] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 13:46:17,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [555751187] [2022-11-23 13:46:17,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:46:17,983 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:46:17,983 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:46:17,992 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 13:46:18,014 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-23 13:46:18,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:46:18,305 INFO L263 TraceCheckSpWp]: Trace formula consists of 1063 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 13:46:18,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 13:46:18,418 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-23 13:46:18,418 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 13:46:18,418 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [555751187] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:46:18,419 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 13:46:18,419 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-23 13:46:18,420 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1787786885] [2022-11-23 13:46:18,420 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:46:18,421 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 13:46:18,421 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:46:18,422 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 13:46:18,422 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:46:18,422 INFO L87 Difference]: Start difference. First operand 386 states and 592 transitions. Second operand has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 2 states have internal predecessors, (106), 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) [2022-11-23 13:46:18,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:46:18,638 INFO L93 Difference]: Finished difference Result 1141 states and 1781 transitions. [2022-11-23 13:46:18,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 13:46:18,638 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 2 states have internal predecessors, (106), 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 143 [2022-11-23 13:46:18,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:46:18,649 INFO L225 Difference]: With dead ends: 1141 [2022-11-23 13:46:18,649 INFO L226 Difference]: Without dead ends: 760 [2022-11-23 13:46:18,651 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:46:18,653 INFO L413 NwaCegarLoop]: 319 mSDtfsCounter, 266 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 266 SdHoareTripleChecker+Valid, 566 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 13:46:18,653 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [266 Valid, 566 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 13:46:18,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 760 states. [2022-11-23 13:46:18,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 760 to 754. [2022-11-23 13:46:18,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 754 states, 633 states have (on average 1.5244865718799367) internal successors, (965), 637 states have internal predecessors, (965), 96 states have call successors, (96), 25 states have call predecessors, (96), 24 states have return successors, (94), 92 states have call predecessors, (94), 94 states have call successors, (94) [2022-11-23 13:46:18,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 754 states to 754 states and 1155 transitions. [2022-11-23 13:46:18,741 INFO L78 Accepts]: Start accepts. Automaton has 754 states and 1155 transitions. Word has length 143 [2022-11-23 13:46:18,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:46:18,742 INFO L495 AbstractCegarLoop]: Abstraction has 754 states and 1155 transitions. [2022-11-23 13:46:18,742 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.333333333333336) internal successors, (106), 2 states have internal predecessors, (106), 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) [2022-11-23 13:46:18,743 INFO L276 IsEmpty]: Start isEmpty. Operand 754 states and 1155 transitions. [2022-11-23 13:46:18,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2022-11-23 13:46:18,751 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:46:18,752 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:46:18,766 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-23 13:46:18,962 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:46:18,963 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:46:18,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:46:18,963 INFO L85 PathProgramCache]: Analyzing trace with hash -2125159409, now seen corresponding path program 1 times [2022-11-23 13:46:18,964 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:46:18,964 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [21145626] [2022-11-23 13:46:18,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:46:18,964 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:46:19,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:46:19,336 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-23 13:46:19,336 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:46:19,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [21145626] [2022-11-23 13:46:19,337 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [21145626] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 13:46:19,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1102474493] [2022-11-23 13:46:19,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:46:19,342 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:46:19,342 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:46:19,343 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 13:46:19,362 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-23 13:46:19,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:46:19,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 1057 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 13:46:19,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 13:46:19,746 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-23 13:46:19,746 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 13:46:19,747 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1102474493] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:46:19,747 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 13:46:19,747 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-23 13:46:19,747 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47057308] [2022-11-23 13:46:19,747 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:46:19,748 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 13:46:19,748 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:46:19,749 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 13:46:19,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:46:19,749 INFO L87 Difference]: Start difference. First operand 754 states and 1155 transitions. Second operand has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 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) [2022-11-23 13:46:19,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:46:19,991 INFO L93 Difference]: Finished difference Result 2239 states and 3490 transitions. [2022-11-23 13:46:19,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 13:46:19,992 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 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 143 [2022-11-23 13:46:19,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:46:20,000 INFO L225 Difference]: With dead ends: 2239 [2022-11-23 13:46:20,001 INFO L226 Difference]: Without dead ends: 1490 [2022-11-23 13:46:20,004 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:46:20,005 INFO L413 NwaCegarLoop]: 289 mSDtfsCounter, 260 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 260 SdHoareTripleChecker+Valid, 536 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 13:46:20,005 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [260 Valid, 536 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 111 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 13:46:20,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1490 states. [2022-11-23 13:46:20,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1490 to 1482. [2022-11-23 13:46:20,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1482 states, 1251 states have (on average 1.5211830535571542) internal successors, (1903), 1257 states have internal predecessors, (1903), 182 states have call successors, (182), 49 states have call predecessors, (182), 48 states have return successors, (180), 176 states have call predecessors, (180), 180 states have call successors, (180) [2022-11-23 13:46:20,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1482 states to 1482 states and 2265 transitions. [2022-11-23 13:46:20,126 INFO L78 Accepts]: Start accepts. Automaton has 1482 states and 2265 transitions. Word has length 143 [2022-11-23 13:46:20,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:46:20,126 INFO L495 AbstractCegarLoop]: Abstraction has 1482 states and 2265 transitions. [2022-11-23 13:46:20,127 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 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) [2022-11-23 13:46:20,127 INFO L276 IsEmpty]: Start isEmpty. Operand 1482 states and 2265 transitions. [2022-11-23 13:46:20,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2022-11-23 13:46:20,140 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:46:20,140 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:46:20,148 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-23 13:46:20,348 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:46:20,349 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:46:20,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:46:20,349 INFO L85 PathProgramCache]: Analyzing trace with hash 1566742221, now seen corresponding path program 1 times [2022-11-23 13:46:20,350 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:46:20,350 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [801190144] [2022-11-23 13:46:20,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:46:20,350 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:46:20,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:46:20,557 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-23 13:46:20,558 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:46:20,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [801190144] [2022-11-23 13:46:20,561 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [801190144] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 13:46:20,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [466532555] [2022-11-23 13:46:20,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:46:20,565 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:46:20,565 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:46:20,566 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 13:46:20,576 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-23 13:46:20,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:46:20,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 1051 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 13:46:20,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 13:46:20,895 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-23 13:46:20,895 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 13:46:20,895 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [466532555] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:46:20,896 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 13:46:20,896 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-23 13:46:20,896 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [711276760] [2022-11-23 13:46:20,896 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:46:20,897 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 13:46:20,897 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:46:20,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 13:46:20,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:46:20,898 INFO L87 Difference]: Start difference. First operand 1482 states and 2265 transitions. Second operand has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 2 states have internal predecessors, (88), 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) [2022-11-23 13:46:21,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:46:21,226 INFO L93 Difference]: Finished difference Result 4411 states and 6858 transitions. [2022-11-23 13:46:21,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 13:46:21,229 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 2 states have internal predecessors, (88), 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 143 [2022-11-23 13:46:21,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:46:21,243 INFO L225 Difference]: With dead ends: 4411 [2022-11-23 13:46:21,243 INFO L226 Difference]: Without dead ends: 2934 [2022-11-23 13:46:21,249 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:46:21,250 INFO L413 NwaCegarLoop]: 317 mSDtfsCounter, 284 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 284 SdHoareTripleChecker+Valid, 564 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 13:46:21,251 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [284 Valid, 564 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 13:46:21,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2934 states. [2022-11-23 13:46:21,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2934 to 2922. [2022-11-23 13:46:21,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2922 states, 2475 states have (on average 1.5171717171717172) internal successors, (3755), 2485 states have internal predecessors, (3755), 350 states have call successors, (350), 97 states have call predecessors, (350), 96 states have return successors, (348), 340 states have call predecessors, (348), 348 states have call successors, (348) [2022-11-23 13:46:21,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2922 states to 2922 states and 4453 transitions. [2022-11-23 13:46:21,416 INFO L78 Accepts]: Start accepts. Automaton has 2922 states and 4453 transitions. Word has length 143 [2022-11-23 13:46:21,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:46:21,416 INFO L495 AbstractCegarLoop]: Abstraction has 2922 states and 4453 transitions. [2022-11-23 13:46:21,417 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 2 states have internal predecessors, (88), 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) [2022-11-23 13:46:21,417 INFO L276 IsEmpty]: Start isEmpty. Operand 2922 states and 4453 transitions. [2022-11-23 13:46:21,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2022-11-23 13:46:21,424 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:46:21,424 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:46:21,439 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-23 13:46:21,631 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:46:21,632 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:46:21,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:46:21,632 INFO L85 PathProgramCache]: Analyzing trace with hash -418140277, now seen corresponding path program 1 times [2022-11-23 13:46:21,632 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:46:21,632 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [912083486] [2022-11-23 13:46:21,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:46:21,633 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:46:21,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:46:21,872 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-23 13:46:21,872 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:46:21,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [912083486] [2022-11-23 13:46:21,873 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [912083486] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 13:46:21,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1855577530] [2022-11-23 13:46:21,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:46:21,873 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:46:21,873 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:46:21,874 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 13:46:21,888 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-23 13:46:22,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:46:22,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 1045 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 13:46:22,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 13:46:22,241 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-23 13:46:22,241 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 13:46:22,241 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1855577530] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:46:22,241 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 13:46:22,242 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-23 13:46:22,242 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1583172988] [2022-11-23 13:46:22,242 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:46:22,242 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 13:46:22,243 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:46:22,243 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 13:46:22,243 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:46:22,243 INFO L87 Difference]: Start difference. First operand 2922 states and 4453 transitions. Second operand has 3 states, 3 states have (on average 38.333333333333336) internal successors, (115), 2 states have internal predecessors, (115), 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) [2022-11-23 13:46:22,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:46:22,715 INFO L93 Difference]: Finished difference Result 8707 states and 13494 transitions. [2022-11-23 13:46:22,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 13:46:22,716 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 38.333333333333336) internal successors, (115), 2 states have internal predecessors, (115), 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 143 [2022-11-23 13:46:22,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:46:22,758 INFO L225 Difference]: With dead ends: 8707 [2022-11-23 13:46:22,759 INFO L226 Difference]: Without dead ends: 5790 [2022-11-23 13:46:22,772 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:46:22,773 INFO L413 NwaCegarLoop]: 278 mSDtfsCounter, 257 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 257 SdHoareTripleChecker+Valid, 525 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 13:46:22,774 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [257 Valid, 525 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 13:46:22,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5790 states. [2022-11-23 13:46:23,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5790 to 5770. [2022-11-23 13:46:23,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5770 states, 4899 states have (on average 1.5127577056542152) internal successors, (7411), 4917 states have internal predecessors, (7411), 678 states have call successors, (678), 193 states have call predecessors, (678), 192 states have return successors, (676), 660 states have call predecessors, (676), 676 states have call successors, (676) [2022-11-23 13:46:23,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5770 states to 5770 states and 8765 transitions. [2022-11-23 13:46:23,162 INFO L78 Accepts]: Start accepts. Automaton has 5770 states and 8765 transitions. Word has length 143 [2022-11-23 13:46:23,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:46:23,162 INFO L495 AbstractCegarLoop]: Abstraction has 5770 states and 8765 transitions. [2022-11-23 13:46:23,162 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 38.333333333333336) internal successors, (115), 2 states have internal predecessors, (115), 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) [2022-11-23 13:46:23,162 INFO L276 IsEmpty]: Start isEmpty. Operand 5770 states and 8765 transitions. [2022-11-23 13:46:23,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2022-11-23 13:46:23,175 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:46:23,176 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:46:23,188 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-23 13:46:23,384 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:46:23,384 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:46:23,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:46:23,384 INFO L85 PathProgramCache]: Analyzing trace with hash -1154292339, now seen corresponding path program 1 times [2022-11-23 13:46:23,385 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:46:23,385 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1877626053] [2022-11-23 13:46:23,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:46:23,385 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:46:23,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:46:23,576 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-23 13:46:23,576 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:46:23,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1877626053] [2022-11-23 13:46:23,577 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1877626053] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 13:46:23,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1121027968] [2022-11-23 13:46:23,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:46:23,577 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:46:23,577 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:46:23,579 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 13:46:23,598 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-23 13:46:23,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:46:23,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 1039 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 13:46:23,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 13:46:23,893 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-23 13:46:23,893 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 13:46:23,893 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1121027968] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:46:23,893 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 13:46:23,893 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-23 13:46:23,894 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454909533] [2022-11-23 13:46:23,894 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:46:23,894 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 13:46:23,894 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:46:23,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 13:46:23,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:46:23,895 INFO L87 Difference]: Start difference. First operand 5770 states and 8765 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 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) [2022-11-23 13:46:24,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:46:24,538 INFO L93 Difference]: Finished difference Result 17203 states and 26566 transitions. [2022-11-23 13:46:24,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 13:46:24,539 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 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 143 [2022-11-23 13:46:24,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:46:24,595 INFO L225 Difference]: With dead ends: 17203 [2022-11-23 13:46:24,595 INFO L226 Difference]: Without dead ends: 11438 [2022-11-23 13:46:24,618 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:46:24,619 INFO L413 NwaCegarLoop]: 315 mSDtfsCounter, 287 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 287 SdHoareTripleChecker+Valid, 562 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 13:46:24,620 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [287 Valid, 562 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 13:46:24,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11438 states. [2022-11-23 13:46:25,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11438 to 11402. [2022-11-23 13:46:25,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11402 states, 9699 states have (on average 1.5080936178987525) internal successors, (14627), 9733 states have internal predecessors, (14627), 1318 states have call successors, (1318), 385 states have call predecessors, (1318), 384 states have return successors, (1316), 1284 states have call predecessors, (1316), 1316 states have call successors, (1316) [2022-11-23 13:46:25,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11402 states to 11402 states and 17261 transitions. [2022-11-23 13:46:25,367 INFO L78 Accepts]: Start accepts. Automaton has 11402 states and 17261 transitions. Word has length 143 [2022-11-23 13:46:25,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:46:25,367 INFO L495 AbstractCegarLoop]: Abstraction has 11402 states and 17261 transitions. [2022-11-23 13:46:25,368 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 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) [2022-11-23 13:46:25,368 INFO L276 IsEmpty]: Start isEmpty. Operand 11402 states and 17261 transitions. [2022-11-23 13:46:25,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2022-11-23 13:46:25,390 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:46:25,391 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:46:25,403 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-23 13:46:25,598 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-23 13:46:25,598 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:46:25,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:46:25,599 INFO L85 PathProgramCache]: Analyzing trace with hash 320941071, now seen corresponding path program 1 times [2022-11-23 13:46:25,599 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:46:25,599 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1625091774] [2022-11-23 13:46:25,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:46:25,599 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:46:25,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:46:25,857 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-23 13:46:25,857 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:46:25,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1625091774] [2022-11-23 13:46:25,858 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1625091774] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 13:46:25,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1288415067] [2022-11-23 13:46:25,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:46:25,858 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:46:25,858 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:46:25,859 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 13:46:25,882 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-23 13:46:26,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:46:26,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 1033 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 13:46:26,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 13:46:26,194 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-23 13:46:26,195 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 13:46:26,195 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1288415067] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:46:26,195 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 13:46:26,195 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-23 13:46:26,196 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [627460709] [2022-11-23 13:46:26,196 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:46:26,196 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 13:46:26,196 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:46:26,197 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 13:46:26,197 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:46:26,197 INFO L87 Difference]: Start difference. First operand 11402 states and 17261 transitions. Second operand has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 2 states have internal predecessors, (94), 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) [2022-11-23 13:46:27,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:46:27,276 INFO L93 Difference]: Finished difference Result 34003 states and 52310 transitions. [2022-11-23 13:46:27,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 13:46:27,285 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 2 states have internal predecessors, (94), 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 143 [2022-11-23 13:46:27,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:46:27,415 INFO L225 Difference]: With dead ends: 34003 [2022-11-23 13:46:27,415 INFO L226 Difference]: Without dead ends: 22606 [2022-11-23 13:46:27,461 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:46:27,462 INFO L413 NwaCegarLoop]: 278 mSDtfsCounter, 278 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 278 SdHoareTripleChecker+Valid, 525 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 13:46:27,463 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [278 Valid, 525 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 13:46:27,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22606 states. [2022-11-23 13:46:28,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22606 to 22538. [2022-11-23 13:46:28,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22538 states, 19203 states have (on average 1.5032546997864917) internal successors, (28867), 19269 states have internal predecessors, (28867), 2566 states have call successors, (2566), 769 states have call predecessors, (2566), 768 states have return successors, (2564), 2500 states have call predecessors, (2564), 2564 states have call successors, (2564) [2022-11-23 13:46:28,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22538 states to 22538 states and 33997 transitions. [2022-11-23 13:46:28,963 INFO L78 Accepts]: Start accepts. Automaton has 22538 states and 33997 transitions. Word has length 143 [2022-11-23 13:46:28,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:46:28,964 INFO L495 AbstractCegarLoop]: Abstraction has 22538 states and 33997 transitions. [2022-11-23 13:46:28,964 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 2 states have internal predecessors, (94), 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) [2022-11-23 13:46:28,964 INFO L276 IsEmpty]: Start isEmpty. Operand 22538 states and 33997 transitions. [2022-11-23 13:46:29,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2022-11-23 13:46:29,015 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:46:29,016 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:46:29,024 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-11-23 13:46:29,223 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-23 13:46:29,224 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:46:29,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:46:29,225 INFO L85 PathProgramCache]: Analyzing trace with hash -1697961139, now seen corresponding path program 1 times [2022-11-23 13:46:29,225 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:46:29,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1527403138] [2022-11-23 13:46:29,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:46:29,225 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:46:29,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:46:29,557 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-23 13:46:29,557 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:46:29,557 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1527403138] [2022-11-23 13:46:29,557 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1527403138] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 13:46:29,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [118072510] [2022-11-23 13:46:29,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:46:29,558 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:46:29,558 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:46:29,559 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 13:46:29,581 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-23 13:46:29,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:46:29,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 1027 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 13:46:29,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 13:46:29,899 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-23 13:46:29,899 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 13:46:29,900 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [118072510] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:46:29,900 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 13:46:29,900 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-23 13:46:29,900 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1928677951] [2022-11-23 13:46:29,900 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:46:29,901 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 13:46:29,901 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:46:29,902 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 13:46:29,902 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:46:29,902 INFO L87 Difference]: Start difference. First operand 22538 states and 33997 transitions. Second operand has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 2 states have internal predecessors, (100), 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) [2022-11-23 13:46:32,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:46:32,194 INFO L93 Difference]: Finished difference Result 67219 states and 102998 transitions. [2022-11-23 13:46:32,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 13:46:32,195 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 2 states have internal predecessors, (100), 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 143 [2022-11-23 13:46:32,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:46:32,459 INFO L225 Difference]: With dead ends: 67219 [2022-11-23 13:46:32,459 INFO L226 Difference]: Without dead ends: 44686 [2022-11-23 13:46:32,553 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:46:32,554 INFO L413 NwaCegarLoop]: 278 mSDtfsCounter, 272 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 272 SdHoareTripleChecker+Valid, 525 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 13:46:32,555 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [272 Valid, 525 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 13:46:32,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44686 states. [2022-11-23 13:46:34,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44686 to 44554. [2022-11-23 13:46:34,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44554 states, 38019 states have (on average 1.4982771772008732) internal successors, (56963), 38149 states have internal predecessors, (56963), 4998 states have call successors, (4998), 1537 states have call predecessors, (4998), 1536 states have return successors, (4996), 4868 states have call predecessors, (4996), 4996 states have call successors, (4996) [2022-11-23 13:46:34,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44554 states to 44554 states and 66957 transitions. [2022-11-23 13:46:34,774 INFO L78 Accepts]: Start accepts. Automaton has 44554 states and 66957 transitions. Word has length 143 [2022-11-23 13:46:34,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:46:34,774 INFO L495 AbstractCegarLoop]: Abstraction has 44554 states and 66957 transitions. [2022-11-23 13:46:34,775 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 2 states have internal predecessors, (100), 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) [2022-11-23 13:46:34,775 INFO L276 IsEmpty]: Start isEmpty. Operand 44554 states and 66957 transitions. [2022-11-23 13:46:34,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2022-11-23 13:46:34,855 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:46:34,855 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:46:34,865 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-23 13:46:35,062 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_83a01645-bdc2-4c73-9f22-ae114b7a1668/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:46:35,063 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:46:35,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:46:35,063 INFO L85 PathProgramCache]: Analyzing trace with hash -1396903669, now seen corresponding path program 1 times [2022-11-23 13:46:35,063 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:46:35,064 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1502522630] [2022-11-23 13:46:35,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:46:35,064 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:46:35,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:46:36,100 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2022-11-23 13:46:36,101 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:46:36,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1502522630] [2022-11-23 13:46:36,101 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1502522630] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:46:36,101 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 13:46:36,102 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-23 13:46:36,102 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1682758446] [2022-11-23 13:46:36,102 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:46:36,103 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-23 13:46:36,103 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:46:36,104 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-23 13:46:36,104 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:46:36,104 INFO L87 Difference]: Start difference. First operand 44554 states and 66957 transitions. Second operand has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 6 states have internal predecessors, (82), 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) [2022-11-23 13:46:41,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:46:41,668 INFO L93 Difference]: Finished difference Result 156434 states and 234772 transitions. [2022-11-23 13:46:41,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-23 13:46:41,669 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 6 states have internal predecessors, (82), 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 143 [2022-11-23 13:46:41,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:46:42,375 INFO L225 Difference]: With dead ends: 156434 [2022-11-23 13:46:42,375 INFO L226 Difference]: Without dead ends: 111886 [2022-11-23 13:46:42,858 INFO L412 NwaCegarLoop]: 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 [2022-11-23 13:46:42,861 INFO L413 NwaCegarLoop]: 285 mSDtfsCounter, 1234 mSDsluCounter, 505 mSDsCounter, 0 mSdLazyCounter, 325 mSolverCounterSat, 151 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1256 SdHoareTripleChecker+Valid, 790 SdHoareTripleChecker+Invalid, 476 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 151 IncrementalHoareTripleChecker+Valid, 325 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-23 13:46:42,862 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1256 Valid, 790 Invalid, 476 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [151 Valid, 325 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-23 13:46:43,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111886 states. [2022-11-23 13:46:47,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111886 to 87562. [2022-11-23 13:46:48,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87562 states, 74755 states have (on average 1.493130894254565) internal successors, (111619), 75013 states have internal predecessors, (111619), 9734 states have call successors, (9734), 3073 states have call predecessors, (9734), 3072 states have return successors, (9732), 9476 states have call predecessors, (9732), 9732 states have call successors, (9732) [2022-11-23 13:46:48,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87562 states to 87562 states and 131085 transitions. [2022-11-23 13:46:48,525 INFO L78 Accepts]: Start accepts. Automaton has 87562 states and 131085 transitions. Word has length 143 [2022-11-23 13:46:48,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:46:48,526 INFO L495 AbstractCegarLoop]: Abstraction has 87562 states and 131085 transitions. [2022-11-23 13:46:48,526 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 6 states have internal predecessors, (82), 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) [2022-11-23 13:46:48,527 INFO L276 IsEmpty]: Start isEmpty. Operand 87562 states and 131085 transitions. [2022-11-23 13:46:48,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2022-11-23 13:46:48,729 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:46:48,729 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:46:48,729 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-11-23 13:46:48,730 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:46:48,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:46:48,730 INFO L85 PathProgramCache]: Analyzing trace with hash 1181035217, now seen corresponding path program 1 times [2022-11-23 13:46:48,730 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:46:48,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2119522165] [2022-11-23 13:46:48,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:46:48,731 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:46:48,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:46:49,864 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2022-11-23 13:46:49,865 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:46:49,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2119522165] [2022-11-23 13:46:49,865 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2119522165] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:46:49,865 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 13:46:49,866 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-23 13:46:49,866 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [838226449] [2022-11-23 13:46:49,866 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:46:49,867 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-23 13:46:49,867 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:46:49,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-23 13:46:49,868 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:46:49,868 INFO L87 Difference]: Start difference. First operand 87562 states and 131085 transitions. Second operand has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 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) [2022-11-23 13:46:58,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:46:58,518 INFO L93 Difference]: Finished difference Result 240402 states and 360339 transitions. [2022-11-23 13:46:58,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-23 13:46:58,519 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 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 144 [2022-11-23 13:46:58,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:46:59,438 INFO L225 Difference]: With dead ends: 240402 [2022-11-23 13:46:59,439 INFO L226 Difference]: Without dead ends: 152846 [2022-11-23 13:47:00,025 INFO L412 NwaCegarLoop]: 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 [2022-11-23 13:47:00,025 INFO L413 NwaCegarLoop]: 271 mSDtfsCounter, 1092 mSDsluCounter, 565 mSDsCounter, 0 mSdLazyCounter, 321 mSolverCounterSat, 165 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1098 SdHoareTripleChecker+Valid, 836 SdHoareTripleChecker+Invalid, 486 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 165 IncrementalHoareTripleChecker+Valid, 321 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-23 13:47:00,027 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1098 Valid, 836 Invalid, 486 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [165 Valid, 321 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-23 13:47:00,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152846 states.