./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.3.3.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 63182f13 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.3.3.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 19261aa21d7ff8465246029ba19079abe08492ae10904d6c12d0346fe16f4773 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-13 01:34:21,331 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-13 01:34:21,334 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-13 01:34:21,388 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-13 01:34:21,389 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-13 01:34:21,394 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-13 01:34:21,396 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-13 01:34:21,400 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-13 01:34:21,402 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-13 01:34:21,408 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-13 01:34:21,409 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-13 01:34:21,411 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-13 01:34:21,412 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-13 01:34:21,414 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-13 01:34:21,416 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-13 01:34:21,421 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-13 01:34:21,423 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-13 01:34:21,424 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-13 01:34:21,426 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-13 01:34:21,435 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-13 01:34:21,437 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-13 01:34:21,438 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-13 01:34:21,442 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-13 01:34:21,443 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-13 01:34:21,454 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-13 01:34:21,454 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-13 01:34:21,455 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-13 01:34:21,457 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-13 01:34:21,458 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-13 01:34:21,459 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-13 01:34:21,460 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-13 01:34:21,461 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-13 01:34:21,463 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-13 01:34:21,465 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-13 01:34:21,466 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-13 01:34:21,467 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-13 01:34:21,467 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-13 01:34:21,468 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-13 01:34:21,468 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-13 01:34:21,469 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-13 01:34:21,470 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-13 01:34:21,471 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-13 01:34:21,501 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-13 01:34:21,501 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-13 01:34:21,502 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-13 01:34:21,502 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-13 01:34:21,503 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-13 01:34:21,503 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-13 01:34:21,503 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-13 01:34:21,504 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-13 01:34:21,504 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-13 01:34:21,504 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-13 01:34:21,504 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-13 01:34:21,505 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-13 01:34:21,505 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-13 01:34:21,505 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-13 01:34:21,505 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-13 01:34:21,506 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-13 01:34:21,506 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-13 01:34:21,507 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-13 01:34:21,507 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-13 01:34:21,507 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-13 01:34:21,508 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-13 01:34:21,508 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-13 01:34:21,508 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-13 01:34:21,508 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-13 01:34:21,509 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-13 01:34:21,509 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-13 01:34:21,509 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-13 01:34:21,509 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-13 01:34:21,510 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-13 01:34:21,510 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-13 01:34:21,510 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-13 01:34:21,510 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-13 01:34:21,511 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-13 01:34:21,511 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-13 01:34:21,511 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-13 01:34:21,512 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-13 01:34:21,512 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-13 01:34:21,512 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-13 01:34:21,512 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-13 01:34:21,513 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-13 01:34:21,513 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 19261aa21d7ff8465246029ba19079abe08492ae10904d6c12d0346fe16f4773 [2021-11-13 01:34:21,843 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-13 01:34:21,878 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-13 01:34:21,881 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-13 01:34:21,883 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-13 01:34:21,884 INFO L275 PluginConnector]: CDTParser initialized [2021-11-13 01:34:21,885 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.3.3.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c [2021-11-13 01:34:21,961 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/data/dd093211d/92f5e1039741436092057f9d0aaedbf5/FLAGd725a4a4c [2021-11-13 01:34:22,536 INFO L306 CDTParser]: Found 1 translation units. [2021-11-13 01:34:22,536 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.3.3.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c [2021-11-13 01:34:22,558 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/data/dd093211d/92f5e1039741436092057f9d0aaedbf5/FLAGd725a4a4c [2021-11-13 01:34:22,854 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/data/dd093211d/92f5e1039741436092057f9d0aaedbf5 [2021-11-13 01:34:22,857 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-13 01:34:22,862 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-13 01:34:22,867 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-13 01:34:22,867 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-13 01:34:22,871 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-13 01:34:22,872 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 01:34:22" (1/1) ... [2021-11-13 01:34:22,875 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@440efe48 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 01:34:22, skipping insertion in model container [2021-11-13 01:34:22,875 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 01:34:22" (1/1) ... [2021-11-13 01:34:22,884 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-13 01:34:22,957 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-13 01:34:23,195 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.3.3.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c[7806,7819] [2021-11-13 01:34:23,260 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-13 01:34:23,274 INFO L203 MainTranslator]: Completed pre-run [2021-11-13 01:34:23,380 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.3.3.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c[7806,7819] [2021-11-13 01:34:23,407 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-13 01:34:23,432 INFO L208 MainTranslator]: Completed translation [2021-11-13 01:34:23,433 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 01:34:23 WrapperNode [2021-11-13 01:34:23,433 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-13 01:34:23,434 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-13 01:34:23,434 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-13 01:34:23,435 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-13 01:34:23,444 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 01:34:23" (1/1) ... [2021-11-13 01:34:23,458 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 01:34:23" (1/1) ... [2021-11-13 01:34:23,523 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-13 01:34:23,541 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-13 01:34:23,541 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-13 01:34:23,544 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-13 01:34:23,554 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 01:34:23" (1/1) ... [2021-11-13 01:34:23,555 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 01:34:23" (1/1) ... [2021-11-13 01:34:23,578 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 01:34:23" (1/1) ... [2021-11-13 01:34:23,578 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 01:34:23" (1/1) ... [2021-11-13 01:34:23,593 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 01:34:23" (1/1) ... [2021-11-13 01:34:23,611 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 01:34:23" (1/1) ... [2021-11-13 01:34:23,614 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 01:34:23" (1/1) ... [2021-11-13 01:34:23,632 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-13 01:34:23,633 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-13 01:34:23,633 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-13 01:34:23,633 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-13 01:34:23,634 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 01:34:23" (1/1) ... [2021-11-13 01:34:23,643 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-13 01:34:23,655 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 01:34:23,670 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-13 01:34:23,691 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-13 01:34:23,729 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-13 01:34:23,729 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-13 01:34:23,729 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-13 01:34:23,729 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-13 01:34:24,768 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-13 01:34:24,769 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-13 01:34:24,772 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 01:34:24 BoogieIcfgContainer [2021-11-13 01:34:24,772 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-13 01:34:24,776 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-13 01:34:24,776 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-13 01:34:24,783 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-13 01:34:24,783 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.11 01:34:22" (1/3) ... [2021-11-13 01:34:24,784 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5507f123 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.11 01:34:24, skipping insertion in model container [2021-11-13 01:34:24,784 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 01:34:23" (2/3) ... [2021-11-13 01:34:24,785 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5507f123 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.11 01:34:24, skipping insertion in model container [2021-11-13 01:34:24,785 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 01:34:24" (3/3) ... [2021-11-13 01:34:24,786 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.3.3.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c [2021-11-13 01:34:24,792 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-13 01:34:24,792 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-13 01:34:24,852 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-13 01:34:24,863 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-13 01:34:24,863 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-13 01:34:24,880 INFO L276 IsEmpty]: Start isEmpty. Operand has 98 states, 96 states have (on average 1.7708333333333333) internal successors, (170), 97 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:24,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-13 01:34:24,888 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 01:34:24,889 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 01:34:24,889 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 01:34:24,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 01:34:24,895 INFO L85 PathProgramCache]: Analyzing trace with hash 566108884, now seen corresponding path program 1 times [2021-11-13 01:34:24,903 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 01:34:24,904 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1853684761] [2021-11-13 01:34:24,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 01:34:24,905 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 01:34:25,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 01:34:25,428 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 01:34:25,428 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 01:34:25,429 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1853684761] [2021-11-13 01:34:25,430 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1853684761] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 01:34:25,430 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 01:34:25,431 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-13 01:34:25,433 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802722708] [2021-11-13 01:34:25,433 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 01:34:25,439 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-13 01:34:25,440 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 01:34:25,475 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-13 01:34:25,476 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-13 01:34:25,479 INFO L87 Difference]: Start difference. First operand has 98 states, 96 states have (on average 1.7708333333333333) internal successors, (170), 97 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:25,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 01:34:25,602 INFO L93 Difference]: Finished difference Result 216 states and 361 transitions. [2021-11-13 01:34:25,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-13 01:34:25,606 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-13 01:34:25,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 01:34:25,626 INFO L225 Difference]: With dead ends: 216 [2021-11-13 01:34:25,627 INFO L226 Difference]: Without dead ends: 146 [2021-11-13 01:34:25,632 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-13 01:34:25,639 INFO L933 BasicCegarLoop]: 237 mSDtfsCounter, 109 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 48.92ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 362 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.49ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 60.46ms IncrementalHoareTripleChecker+Time [2021-11-13 01:34:25,641 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 362 Invalid, 20 Unknown, 0 Unchecked, 5.49ms Time], IncrementalHoareTripleChecker [2 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 60.46ms Time] [2021-11-13 01:34:25,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-11-13 01:34:25,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 144. [2021-11-13 01:34:25,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 143 states have (on average 1.5034965034965035) internal successors, (215), 143 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:25,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 215 transitions. [2021-11-13 01:34:25,704 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 215 transitions. Word has length 43 [2021-11-13 01:34:25,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 01:34:25,705 INFO L470 AbstractCegarLoop]: Abstraction has 144 states and 215 transitions. [2021-11-13 01:34:25,705 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:25,705 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 215 transitions. [2021-11-13 01:34:25,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-13 01:34:25,708 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 01:34:25,708 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 01:34:25,708 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-13 01:34:25,709 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 01:34:25,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 01:34:25,710 INFO L85 PathProgramCache]: Analyzing trace with hash -1914990475, now seen corresponding path program 1 times [2021-11-13 01:34:25,710 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 01:34:25,710 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [625620253] [2021-11-13 01:34:25,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 01:34:25,711 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 01:34:25,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 01:34:25,817 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 01:34:25,818 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 01:34:25,818 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [625620253] [2021-11-13 01:34:25,818 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [625620253] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 01:34:25,819 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 01:34:25,819 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-13 01:34:25,819 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [118763539] [2021-11-13 01:34:25,819 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 01:34:25,821 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-13 01:34:25,825 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 01:34:25,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-13 01:34:25,826 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-13 01:34:25,826 INFO L87 Difference]: Start difference. First operand 144 states and 215 transitions. Second operand has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:25,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 01:34:25,913 INFO L93 Difference]: Finished difference Result 321 states and 502 transitions. [2021-11-13 01:34:25,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-13 01:34:25,913 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-11-13 01:34:25,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 01:34:25,916 INFO L225 Difference]: With dead ends: 321 [2021-11-13 01:34:25,917 INFO L226 Difference]: Without dead ends: 209 [2021-11-13 01:34:25,918 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-13 01:34:25,920 INFO L933 BasicCegarLoop]: 127 mSDtfsCounter, 95 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 42.15ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.19ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 62.15ms IncrementalHoareTripleChecker+Time [2021-11-13 01:34:25,920 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 225 Invalid, 25 Unknown, 0 Unchecked, 2.19ms Time], IncrementalHoareTripleChecker [3 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 62.15ms Time] [2021-11-13 01:34:25,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2021-11-13 01:34:25,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 207. [2021-11-13 01:34:25,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 206 states have (on average 1.5242718446601942) internal successors, (314), 206 states have internal predecessors, (314), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:25,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 314 transitions. [2021-11-13 01:34:25,951 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 314 transitions. Word has length 45 [2021-11-13 01:34:25,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 01:34:25,951 INFO L470 AbstractCegarLoop]: Abstraction has 207 states and 314 transitions. [2021-11-13 01:34:25,952 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:25,952 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 314 transitions. [2021-11-13 01:34:25,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-13 01:34:25,954 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 01:34:25,954 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 01:34:25,954 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-13 01:34:25,955 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 01:34:25,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 01:34:25,956 INFO L85 PathProgramCache]: Analyzing trace with hash -1398553194, now seen corresponding path program 1 times [2021-11-13 01:34:25,956 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 01:34:25,956 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1462838619] [2021-11-13 01:34:25,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 01:34:25,957 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 01:34:26,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 01:34:26,111 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 01:34:26,111 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 01:34:26,112 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1462838619] [2021-11-13 01:34:26,112 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1462838619] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 01:34:26,112 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 01:34:26,113 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-13 01:34:26,113 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2046199612] [2021-11-13 01:34:26,113 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 01:34:26,114 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-13 01:34:26,114 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 01:34:26,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-13 01:34:26,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-13 01:34:26,115 INFO L87 Difference]: Start difference. First operand 207 states and 314 transitions. Second operand has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:26,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 01:34:26,180 INFO L93 Difference]: Finished difference Result 511 states and 805 transitions. [2021-11-13 01:34:26,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-13 01:34:26,182 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-13 01:34:26,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 01:34:26,186 INFO L225 Difference]: With dead ends: 511 [2021-11-13 01:34:26,186 INFO L226 Difference]: Without dead ends: 338 [2021-11-13 01:34:26,188 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-13 01:34:26,190 INFO L933 BasicCegarLoop]: 175 mSDtfsCounter, 95 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 33.14ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 276 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.65ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 38.76ms IncrementalHoareTripleChecker+Time [2021-11-13 01:34:26,190 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 276 Invalid, 16 Unknown, 0 Unchecked, 1.65ms Time], IncrementalHoareTripleChecker [2 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 38.76ms Time] [2021-11-13 01:34:26,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2021-11-13 01:34:26,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 336. [2021-11-13 01:34:26,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 336 states, 335 states have (on average 1.5552238805970149) internal successors, (521), 335 states have internal predecessors, (521), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:26,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 521 transitions. [2021-11-13 01:34:26,237 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 521 transitions. Word has length 47 [2021-11-13 01:34:26,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 01:34:26,238 INFO L470 AbstractCegarLoop]: Abstraction has 336 states and 521 transitions. [2021-11-13 01:34:26,239 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:26,239 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 521 transitions. [2021-11-13 01:34:26,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-13 01:34:26,241 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 01:34:26,241 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 01:34:26,241 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-13 01:34:26,242 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 01:34:26,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 01:34:26,243 INFO L85 PathProgramCache]: Analyzing trace with hash 1696286242, now seen corresponding path program 1 times [2021-11-13 01:34:26,243 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 01:34:26,243 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2131363693] [2021-11-13 01:34:26,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 01:34:26,244 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 01:34:26,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 01:34:26,356 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 01:34:26,357 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 01:34:26,357 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2131363693] [2021-11-13 01:34:26,358 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2131363693] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 01:34:26,358 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 01:34:26,358 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-13 01:34:26,358 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1247065265] [2021-11-13 01:34:26,359 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 01:34:26,359 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-13 01:34:26,360 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 01:34:26,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-13 01:34:26,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-13 01:34:26,361 INFO L87 Difference]: Start difference. First operand 336 states and 521 transitions. Second operand has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:26,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 01:34:26,437 INFO L93 Difference]: Finished difference Result 827 states and 1312 transitions. [2021-11-13 01:34:26,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-13 01:34:26,438 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-13 01:34:26,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 01:34:26,446 INFO L225 Difference]: With dead ends: 827 [2021-11-13 01:34:26,447 INFO L226 Difference]: Without dead ends: 525 [2021-11-13 01:34:26,451 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-13 01:34:26,461 INFO L933 BasicCegarLoop]: 136 mSDtfsCounter, 94 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 30.50ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 241 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.62ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 39.10ms IncrementalHoareTripleChecker+Time [2021-11-13 01:34:26,463 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [94 Valid, 241 Invalid, 13 Unknown, 0 Unchecked, 1.62ms Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 39.10ms Time] [2021-11-13 01:34:26,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 525 states. [2021-11-13 01:34:26,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 525 to 523. [2021-11-13 01:34:26,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 523 states, 522 states have (on average 1.5727969348659003) internal successors, (821), 522 states have internal predecessors, (821), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:26,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 523 states to 523 states and 821 transitions. [2021-11-13 01:34:26,529 INFO L78 Accepts]: Start accepts. Automaton has 523 states and 821 transitions. Word has length 49 [2021-11-13 01:34:26,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 01:34:26,529 INFO L470 AbstractCegarLoop]: Abstraction has 523 states and 821 transitions. [2021-11-13 01:34:26,530 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:26,530 INFO L276 IsEmpty]: Start isEmpty. Operand 523 states and 821 transitions. [2021-11-13 01:34:26,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-13 01:34:26,531 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 01:34:26,532 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 01:34:26,532 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-13 01:34:26,548 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 01:34:26,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 01:34:26,549 INFO L85 PathProgramCache]: Analyzing trace with hash -2030005373, now seen corresponding path program 1 times [2021-11-13 01:34:26,550 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 01:34:26,550 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [971129508] [2021-11-13 01:34:26,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 01:34:26,551 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 01:34:26,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 01:34:26,631 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 01:34:26,632 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 01:34:26,632 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [971129508] [2021-11-13 01:34:26,632 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [971129508] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 01:34:26,633 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 01:34:26,633 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-13 01:34:26,633 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509260693] [2021-11-13 01:34:26,633 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 01:34:26,634 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-13 01:34:26,634 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 01:34:26,635 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-13 01:34:26,635 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-13 01:34:26,635 INFO L87 Difference]: Start difference. First operand 523 states and 821 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:26,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 01:34:26,721 INFO L93 Difference]: Finished difference Result 1343 states and 2140 transitions. [2021-11-13 01:34:26,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-13 01:34:26,722 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-13 01:34:26,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 01:34:26,728 INFO L225 Difference]: With dead ends: 1343 [2021-11-13 01:34:26,728 INFO L226 Difference]: Without dead ends: 870 [2021-11-13 01:34:26,730 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-13 01:34:26,731 INFO L933 BasicCegarLoop]: 150 mSDtfsCounter, 89 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 33.04ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.88ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 38.73ms IncrementalHoareTripleChecker+Time [2021-11-13 01:34:26,732 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 252 Invalid, 16 Unknown, 0 Unchecked, 0.88ms Time], IncrementalHoareTripleChecker [2 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 38.73ms Time] [2021-11-13 01:34:26,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 870 states. [2021-11-13 01:34:26,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 870 to 868. [2021-11-13 01:34:26,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 868 states, 867 states have (on average 1.5767012687427913) internal successors, (1367), 867 states have internal predecessors, (1367), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:26,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 868 states to 868 states and 1367 transitions. [2021-11-13 01:34:26,786 INFO L78 Accepts]: Start accepts. Automaton has 868 states and 1367 transitions. Word has length 51 [2021-11-13 01:34:26,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 01:34:26,787 INFO L470 AbstractCegarLoop]: Abstraction has 868 states and 1367 transitions. [2021-11-13 01:34:26,787 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:26,787 INFO L276 IsEmpty]: Start isEmpty. Operand 868 states and 1367 transitions. [2021-11-13 01:34:26,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-13 01:34:26,789 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 01:34:26,789 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 01:34:26,789 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-13 01:34:26,789 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 01:34:26,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 01:34:26,790 INFO L85 PathProgramCache]: Analyzing trace with hash -745174181, now seen corresponding path program 1 times [2021-11-13 01:34:26,790 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 01:34:26,791 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [842825] [2021-11-13 01:34:26,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 01:34:26,791 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 01:34:26,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 01:34:26,845 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 01:34:26,845 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 01:34:26,845 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [842825] [2021-11-13 01:34:26,846 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [842825] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 01:34:26,846 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 01:34:26,846 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-13 01:34:26,846 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [401414536] [2021-11-13 01:34:26,846 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 01:34:26,847 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-13 01:34:26,847 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 01:34:26,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-13 01:34:26,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-13 01:34:26,848 INFO L87 Difference]: Start difference. First operand 868 states and 1367 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:26,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 01:34:26,979 INFO L93 Difference]: Finished difference Result 2175 states and 3463 transitions. [2021-11-13 01:34:26,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-13 01:34:26,980 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2021-11-13 01:34:26,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 01:34:26,990 INFO L225 Difference]: With dead ends: 2175 [2021-11-13 01:34:26,991 INFO L226 Difference]: Without dead ends: 1357 [2021-11-13 01:34:26,992 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-13 01:34:26,994 INFO L933 BasicCegarLoop]: 137 mSDtfsCounter, 88 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 27.43ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.84ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 32.83ms IncrementalHoareTripleChecker+Time [2021-11-13 01:34:26,995 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 243 Invalid, 13 Unknown, 0 Unchecked, 0.84ms Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 32.83ms Time] [2021-11-13 01:34:26,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1357 states. [2021-11-13 01:34:27,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1357 to 1355. [2021-11-13 01:34:27,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1355 states, 1354 states have (on average 1.5834564254062038) internal successors, (2144), 1354 states have internal predecessors, (2144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:27,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1355 states to 1355 states and 2144 transitions. [2021-11-13 01:34:27,079 INFO L78 Accepts]: Start accepts. Automaton has 1355 states and 2144 transitions. Word has length 53 [2021-11-13 01:34:27,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 01:34:27,079 INFO L470 AbstractCegarLoop]: Abstraction has 1355 states and 2144 transitions. [2021-11-13 01:34:27,080 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:27,080 INFO L276 IsEmpty]: Start isEmpty. Operand 1355 states and 2144 transitions. [2021-11-13 01:34:27,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-13 01:34:27,082 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 01:34:27,082 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 01:34:27,083 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-13 01:34:27,083 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 01:34:27,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 01:34:27,084 INFO L85 PathProgramCache]: Analyzing trace with hash -585568132, now seen corresponding path program 1 times [2021-11-13 01:34:27,084 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 01:34:27,084 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [95042198] [2021-11-13 01:34:27,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 01:34:27,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 01:34:27,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 01:34:27,205 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 01:34:27,206 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 01:34:27,206 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [95042198] [2021-11-13 01:34:27,206 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [95042198] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 01:34:27,206 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 01:34:27,207 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-13 01:34:27,207 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428065079] [2021-11-13 01:34:27,207 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 01:34:27,208 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 01:34:27,209 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 01:34:27,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 01:34:27,209 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-13 01:34:27,210 INFO L87 Difference]: Start difference. First operand 1355 states and 2144 transitions. Second operand has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:27,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 01:34:27,570 INFO L93 Difference]: Finished difference Result 3443 states and 5471 transitions. [2021-11-13 01:34:27,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-13 01:34:27,571 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-13 01:34:27,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 01:34:27,586 INFO L225 Difference]: With dead ends: 3443 [2021-11-13 01:34:27,586 INFO L226 Difference]: Without dead ends: 2154 [2021-11-13 01:34:27,589 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-13 01:34:27,590 INFO L933 BasicCegarLoop]: 134 mSDtfsCounter, 546 mSDsluCounter, 835 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 131.81ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 546 SdHoareTripleChecker+Valid, 959 SdHoareTripleChecker+Invalid, 139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.40ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 158.66ms IncrementalHoareTripleChecker+Time [2021-11-13 01:34:27,590 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [546 Valid, 959 Invalid, 139 Unknown, 0 Unchecked, 5.40ms Time], IncrementalHoareTripleChecker [5 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 158.66ms Time] [2021-11-13 01:34:27,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2154 states. [2021-11-13 01:34:27,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2154 to 2144. [2021-11-13 01:34:27,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2144 states, 2143 states have (on average 1.5762949136724218) internal successors, (3378), 2143 states have internal predecessors, (3378), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:27,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2144 states to 2144 states and 3378 transitions. [2021-11-13 01:34:27,752 INFO L78 Accepts]: Start accepts. Automaton has 2144 states and 3378 transitions. Word has length 55 [2021-11-13 01:34:27,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 01:34:27,754 INFO L470 AbstractCegarLoop]: Abstraction has 2144 states and 3378 transitions. [2021-11-13 01:34:27,754 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:27,754 INFO L276 IsEmpty]: Start isEmpty. Operand 2144 states and 3378 transitions. [2021-11-13 01:34:27,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-13 01:34:27,759 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 01:34:27,759 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 01:34:27,759 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-13 01:34:27,760 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 01:34:27,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 01:34:27,763 INFO L85 PathProgramCache]: Analyzing trace with hash -1035247094, now seen corresponding path program 1 times [2021-11-13 01:34:27,763 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 01:34:27,763 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2034274728] [2021-11-13 01:34:27,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 01:34:27,764 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 01:34:27,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 01:34:27,859 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 01:34:27,859 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 01:34:27,859 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2034274728] [2021-11-13 01:34:27,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2034274728] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 01:34:27,860 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 01:34:27,860 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-13 01:34:27,860 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [838035655] [2021-11-13 01:34:27,861 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 01:34:27,861 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-13 01:34:27,861 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 01:34:27,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-13 01:34:27,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-13 01:34:27,862 INFO L87 Difference]: Start difference. First operand 2144 states and 3378 transitions. Second operand has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:28,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 01:34:28,134 INFO L93 Difference]: Finished difference Result 4224 states and 6675 transitions. [2021-11-13 01:34:28,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-13 01:34:28,135 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-13 01:34:28,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 01:34:28,165 INFO L225 Difference]: With dead ends: 4224 [2021-11-13 01:34:28,165 INFO L226 Difference]: Without dead ends: 2146 [2021-11-13 01:34:28,207 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-13 01:34:28,208 INFO L933 BasicCegarLoop]: 127 mSDtfsCounter, 182 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 72.10ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 182 SdHoareTripleChecker+Valid, 347 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.08ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 117.10ms IncrementalHoareTripleChecker+Time [2021-11-13 01:34:28,209 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [182 Valid, 347 Invalid, 43 Unknown, 0 Unchecked, 4.08ms Time], IncrementalHoareTripleChecker [0 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 117.10ms Time] [2021-11-13 01:34:28,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2146 states. [2021-11-13 01:34:28,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2146 to 2144. [2021-11-13 01:34:28,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2144 states, 2143 states have (on average 1.570695286980868) internal successors, (3366), 2143 states have internal predecessors, (3366), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:28,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2144 states to 2144 states and 3366 transitions. [2021-11-13 01:34:28,392 INFO L78 Accepts]: Start accepts. Automaton has 2144 states and 3366 transitions. Word has length 56 [2021-11-13 01:34:28,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 01:34:28,392 INFO L470 AbstractCegarLoop]: Abstraction has 2144 states and 3366 transitions. [2021-11-13 01:34:28,393 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:28,393 INFO L276 IsEmpty]: Start isEmpty. Operand 2144 states and 3366 transitions. [2021-11-13 01:34:28,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-13 01:34:28,394 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 01:34:28,394 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 01:34:28,394 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-13 01:34:28,395 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 01:34:28,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 01:34:28,395 INFO L85 PathProgramCache]: Analyzing trace with hash -2085835005, now seen corresponding path program 1 times [2021-11-13 01:34:28,396 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 01:34:28,396 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [512893409] [2021-11-13 01:34:28,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 01:34:28,396 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 01:34:28,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 01:34:28,455 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 01:34:28,456 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 01:34:28,456 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [512893409] [2021-11-13 01:34:28,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [512893409] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 01:34:28,457 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 01:34:28,457 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-13 01:34:28,457 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1404682041] [2021-11-13 01:34:28,457 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 01:34:28,458 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-13 01:34:28,458 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 01:34:28,459 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-13 01:34:28,459 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-13 01:34:28,459 INFO L87 Difference]: Start difference. First operand 2144 states and 3366 transitions. Second operand has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:28,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 01:34:28,705 INFO L93 Difference]: Finished difference Result 4224 states and 6651 transitions. [2021-11-13 01:34:28,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-13 01:34:28,706 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-11-13 01:34:28,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 01:34:28,722 INFO L225 Difference]: With dead ends: 4224 [2021-11-13 01:34:28,723 INFO L226 Difference]: Without dead ends: 2146 [2021-11-13 01:34:28,726 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-13 01:34:28,727 INFO L933 BasicCegarLoop]: 131 mSDtfsCounter, 190 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 56.97ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 190 SdHoareTripleChecker+Valid, 353 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.78ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 68.23ms IncrementalHoareTripleChecker+Time [2021-11-13 01:34:28,728 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [190 Valid, 353 Invalid, 44 Unknown, 0 Unchecked, 1.78ms Time], IncrementalHoareTripleChecker [0 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 68.23ms Time] [2021-11-13 01:34:28,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2146 states. [2021-11-13 01:34:28,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2146 to 2144. [2021-11-13 01:34:28,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2144 states, 2143 states have (on average 1.565095660289314) internal successors, (3354), 2143 states have internal predecessors, (3354), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:28,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2144 states to 2144 states and 3354 transitions. [2021-11-13 01:34:28,886 INFO L78 Accepts]: Start accepts. Automaton has 2144 states and 3354 transitions. Word has length 57 [2021-11-13 01:34:28,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 01:34:28,886 INFO L470 AbstractCegarLoop]: Abstraction has 2144 states and 3354 transitions. [2021-11-13 01:34:28,887 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:28,887 INFO L276 IsEmpty]: Start isEmpty. Operand 2144 states and 3354 transitions. [2021-11-13 01:34:28,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-13 01:34:28,888 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 01:34:28,888 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 01:34:28,888 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-13 01:34:28,888 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 01:34:28,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 01:34:28,889 INFO L85 PathProgramCache]: Analyzing trace with hash -289763855, now seen corresponding path program 1 times [2021-11-13 01:34:28,889 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 01:34:28,889 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1794736094] [2021-11-13 01:34:28,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 01:34:28,890 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 01:34:28,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 01:34:28,970 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 01:34:28,971 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 01:34:28,971 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1794736094] [2021-11-13 01:34:28,971 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1794736094] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 01:34:28,971 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 01:34:28,972 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-13 01:34:28,972 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [317876901] [2021-11-13 01:34:28,972 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 01:34:28,973 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-13 01:34:28,973 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 01:34:28,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-13 01:34:28,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-13 01:34:28,978 INFO L87 Difference]: Start difference. First operand 2144 states and 3354 transitions. Second operand has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:29,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 01:34:29,206 INFO L93 Difference]: Finished difference Result 4224 states and 6627 transitions. [2021-11-13 01:34:29,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-13 01:34:29,207 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-11-13 01:34:29,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 01:34:29,221 INFO L225 Difference]: With dead ends: 4224 [2021-11-13 01:34:29,221 INFO L226 Difference]: Without dead ends: 2146 [2021-11-13 01:34:29,225 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-13 01:34:29,226 INFO L933 BasicCegarLoop]: 132 mSDtfsCounter, 188 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 51.82ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 188 SdHoareTripleChecker+Valid, 356 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.71ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 61.86ms IncrementalHoareTripleChecker+Time [2021-11-13 01:34:29,227 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [188 Valid, 356 Invalid, 43 Unknown, 0 Unchecked, 1.71ms Time], IncrementalHoareTripleChecker [0 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 61.86ms Time] [2021-11-13 01:34:29,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2146 states. [2021-11-13 01:34:29,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2146 to 2144. [2021-11-13 01:34:29,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2144 states, 2143 states have (on average 1.5594960335977601) internal successors, (3342), 2143 states have internal predecessors, (3342), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:29,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2144 states to 2144 states and 3342 transitions. [2021-11-13 01:34:29,374 INFO L78 Accepts]: Start accepts. Automaton has 2144 states and 3342 transitions. Word has length 58 [2021-11-13 01:34:29,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 01:34:29,374 INFO L470 AbstractCegarLoop]: Abstraction has 2144 states and 3342 transitions. [2021-11-13 01:34:29,374 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:29,374 INFO L276 IsEmpty]: Start isEmpty. Operand 2144 states and 3342 transitions. [2021-11-13 01:34:29,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-13 01:34:29,375 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 01:34:29,376 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 01:34:29,376 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-13 01:34:29,376 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 01:34:29,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 01:34:29,377 INFO L85 PathProgramCache]: Analyzing trace with hash -807501630, now seen corresponding path program 1 times [2021-11-13 01:34:29,377 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 01:34:29,377 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1476759754] [2021-11-13 01:34:29,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 01:34:29,378 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 01:34:29,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 01:34:29,557 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 01:34:29,558 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 01:34:29,558 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1476759754] [2021-11-13 01:34:29,558 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1476759754] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 01:34:29,558 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 01:34:29,559 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-13 01:34:29,559 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107043905] [2021-11-13 01:34:29,559 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 01:34:29,559 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 01:34:29,560 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 01:34:29,560 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 01:34:29,561 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-13 01:34:29,561 INFO L87 Difference]: Start difference. First operand 2144 states and 3342 transitions. Second operand has 5 states, 5 states have (on average 12.0) internal successors, (60), 5 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:29,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 01:34:29,870 INFO L93 Difference]: Finished difference Result 4224 states and 6603 transitions. [2021-11-13 01:34:29,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 01:34:29,871 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.0) internal successors, (60), 5 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-13 01:34:29,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 01:34:29,885 INFO L225 Difference]: With dead ends: 4224 [2021-11-13 01:34:29,886 INFO L226 Difference]: Without dead ends: 2146 [2021-11-13 01:34:29,890 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-13 01:34:29,890 INFO L933 BasicCegarLoop]: 130 mSDtfsCounter, 145 mSDsluCounter, 321 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 87.58ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 145 SdHoareTripleChecker+Valid, 448 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.71ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 103.37ms IncrementalHoareTripleChecker+Time [2021-11-13 01:34:29,891 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [145 Valid, 448 Invalid, 76 Unknown, 0 Unchecked, 1.71ms Time], IncrementalHoareTripleChecker [1 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 103.37ms Time] [2021-11-13 01:34:29,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2146 states. [2021-11-13 01:34:30,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2146 to 2144. [2021-11-13 01:34:30,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2144 states, 2143 states have (on average 1.5557629491367242) internal successors, (3334), 2143 states have internal predecessors, (3334), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:30,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2144 states to 2144 states and 3334 transitions. [2021-11-13 01:34:30,068 INFO L78 Accepts]: Start accepts. Automaton has 2144 states and 3334 transitions. Word has length 60 [2021-11-13 01:34:30,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 01:34:30,068 INFO L470 AbstractCegarLoop]: Abstraction has 2144 states and 3334 transitions. [2021-11-13 01:34:30,069 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.0) internal successors, (60), 5 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:30,069 INFO L276 IsEmpty]: Start isEmpty. Operand 2144 states and 3334 transitions. [2021-11-13 01:34:30,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-13 01:34:30,072 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 01:34:30,072 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 01:34:30,073 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-13 01:34:30,073 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 01:34:30,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 01:34:30,073 INFO L85 PathProgramCache]: Analyzing trace with hash 2077186613, now seen corresponding path program 1 times [2021-11-13 01:34:30,074 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 01:34:30,074 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1620876974] [2021-11-13 01:34:30,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 01:34:30,074 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 01:34:30,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 01:34:30,206 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 01:34:30,207 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 01:34:30,207 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1620876974] [2021-11-13 01:34:30,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1620876974] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 01:34:30,207 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 01:34:30,208 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-13 01:34:30,208 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1330669548] [2021-11-13 01:34:30,208 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 01:34:30,208 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 01:34:30,209 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 01:34:30,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 01:34:30,209 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-13 01:34:30,210 INFO L87 Difference]: Start difference. First operand 2144 states and 3334 transitions. Second operand has 5 states, 5 states have (on average 12.6) internal successors, (63), 5 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:30,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 01:34:30,542 INFO L93 Difference]: Finished difference Result 5396 states and 8389 transitions. [2021-11-13 01:34:30,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 01:34:30,543 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.6) internal successors, (63), 5 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 63 [2021-11-13 01:34:30,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 01:34:30,567 INFO L225 Difference]: With dead ends: 5396 [2021-11-13 01:34:30,568 INFO L226 Difference]: Without dead ends: 3318 [2021-11-13 01:34:30,572 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-13 01:34:30,573 INFO L933 BasicCegarLoop]: 135 mSDtfsCounter, 290 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 60.71ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 290 SdHoareTripleChecker+Valid, 361 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.32ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 71.83ms IncrementalHoareTripleChecker+Time [2021-11-13 01:34:30,574 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [290 Valid, 361 Invalid, 49 Unknown, 0 Unchecked, 2.32ms Time], IncrementalHoareTripleChecker [3 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 71.83ms Time] [2021-11-13 01:34:30,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3318 states. [2021-11-13 01:34:30,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3318 to 3316. [2021-11-13 01:34:30,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3316 states, 3315 states have (on average 1.5457013574660634) internal successors, (5124), 3315 states have internal predecessors, (5124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:30,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3316 states to 3316 states and 5124 transitions. [2021-11-13 01:34:30,829 INFO L78 Accepts]: Start accepts. Automaton has 3316 states and 5124 transitions. Word has length 63 [2021-11-13 01:34:30,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 01:34:30,830 INFO L470 AbstractCegarLoop]: Abstraction has 3316 states and 5124 transitions. [2021-11-13 01:34:30,830 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.6) internal successors, (63), 5 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:30,830 INFO L276 IsEmpty]: Start isEmpty. Operand 3316 states and 5124 transitions. [2021-11-13 01:34:30,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-13 01:34:30,831 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 01:34:30,831 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 01:34:30,831 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-13 01:34:30,832 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 01:34:30,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 01:34:30,832 INFO L85 PathProgramCache]: Analyzing trace with hash -20376734, now seen corresponding path program 1 times [2021-11-13 01:34:30,833 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 01:34:30,833 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2132546876] [2021-11-13 01:34:30,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 01:34:30,833 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 01:34:30,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 01:34:30,946 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 01:34:30,946 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 01:34:30,946 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2132546876] [2021-11-13 01:34:30,947 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2132546876] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 01:34:30,947 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 01:34:30,947 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-13 01:34:30,947 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2131018298] [2021-11-13 01:34:30,947 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 01:34:30,948 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-13 01:34:30,948 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 01:34:30,949 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-13 01:34:30,949 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-13 01:34:30,949 INFO L87 Difference]: Start difference. First operand 3316 states and 5124 transitions. Second operand has 6 states, 6 states have (on average 10.666666666666666) internal successors, (64), 6 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:31,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 01:34:31,371 INFO L93 Difference]: Finished difference Result 4050 states and 6223 transitions. [2021-11-13 01:34:31,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-13 01:34:31,372 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.666666666666666) internal successors, (64), 6 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-13 01:34:31,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 01:34:31,399 INFO L225 Difference]: With dead ends: 4050 [2021-11-13 01:34:31,399 INFO L226 Difference]: Without dead ends: 4048 [2021-11-13 01:34:31,401 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-13 01:34:31,402 INFO L933 BasicCegarLoop]: 275 mSDtfsCounter, 256 mSDsluCounter, 568 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 111.48ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 831 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.76ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 133.82ms IncrementalHoareTripleChecker+Time [2021-11-13 01:34:31,402 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [256 Valid, 831 Invalid, 105 Unknown, 0 Unchecked, 3.76ms Time], IncrementalHoareTripleChecker [2 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 133.82ms Time] [2021-11-13 01:34:31,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4048 states. [2021-11-13 01:34:31,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4048 to 3322. [2021-11-13 01:34:31,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3322 states, 3321 states have (on average 1.5429087624209576) internal successors, (5124), 3321 states have internal predecessors, (5124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:31,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3322 states to 3322 states and 5124 transitions. [2021-11-13 01:34:31,659 INFO L78 Accepts]: Start accepts. Automaton has 3322 states and 5124 transitions. Word has length 64 [2021-11-13 01:34:31,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 01:34:31,660 INFO L470 AbstractCegarLoop]: Abstraction has 3322 states and 5124 transitions. [2021-11-13 01:34:31,660 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.666666666666666) internal successors, (64), 6 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:31,660 INFO L276 IsEmpty]: Start isEmpty. Operand 3322 states and 5124 transitions. [2021-11-13 01:34:31,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-13 01:34:31,661 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 01:34:31,662 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 01:34:31,662 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-13 01:34:31,662 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 01:34:31,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 01:34:31,663 INFO L85 PathProgramCache]: Analyzing trace with hash 329424148, now seen corresponding path program 1 times [2021-11-13 01:34:31,663 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 01:34:31,663 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1472138577] [2021-11-13 01:34:31,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 01:34:31,663 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 01:34:31,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 01:34:32,431 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-13 01:34:32,431 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 01:34:32,432 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1472138577] [2021-11-13 01:34:32,432 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1472138577] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 01:34:32,432 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [809354023] [2021-11-13 01:34:32,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 01:34:32,433 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 01:34:32,433 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 01:34:32,436 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 01:34:32,441 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-13 01:34:32,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 01:34:32,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-13 01:34:32,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 01:34:33,561 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-13 01:34:33,562 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 01:34:34,204 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-13 01:34:34,205 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [809354023] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-13 01:34:34,205 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-13 01:34:34,206 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [10, 6] total 16 [2021-11-13 01:34:34,206 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537829704] [2021-11-13 01:34:34,206 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 01:34:34,207 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 01:34:34,208 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 01:34:34,208 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 01:34:34,208 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-13 01:34:34,209 INFO L87 Difference]: Start difference. First operand 3322 states and 5124 transitions. Second operand has 5 states, 5 states have (on average 14.2) internal successors, (71), 4 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:34,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 01:34:34,997 INFO L93 Difference]: Finished difference Result 9611 states and 14848 transitions. [2021-11-13 01:34:34,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 01:34:34,998 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 14.2) internal successors, (71), 4 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-13 01:34:34,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 01:34:35,043 INFO L225 Difference]: With dead ends: 9611 [2021-11-13 01:34:35,043 INFO L226 Difference]: Without dead ends: 6352 [2021-11-13 01:34:35,050 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 140 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-11-13 01:34:35,051 INFO L933 BasicCegarLoop]: 216 mSDtfsCounter, 312 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 43.02ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 312 SdHoareTripleChecker+Valid, 346 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.36ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 48.70ms IncrementalHoareTripleChecker+Time [2021-11-13 01:34:35,052 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [312 Valid, 346 Invalid, 24 Unknown, 0 Unchecked, 2.36ms Time], IncrementalHoareTripleChecker [1 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 48.70ms Time] [2021-11-13 01:34:35,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6352 states. [2021-11-13 01:34:35,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6352 to 6350. [2021-11-13 01:34:35,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6350 states, 6349 states have (on average 1.5364624350291385) internal successors, (9755), 6349 states have internal predecessors, (9755), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:35,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6350 states to 6350 states and 9755 transitions. [2021-11-13 01:34:35,708 INFO L78 Accepts]: Start accepts. Automaton has 6350 states and 9755 transitions. Word has length 74 [2021-11-13 01:34:35,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 01:34:35,709 INFO L470 AbstractCegarLoop]: Abstraction has 6350 states and 9755 transitions. [2021-11-13 01:34:35,709 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 14.2) internal successors, (71), 4 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:35,709 INFO L276 IsEmpty]: Start isEmpty. Operand 6350 states and 9755 transitions. [2021-11-13 01:34:35,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-13 01:34:35,711 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 01:34:35,711 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 01:34:35,755 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-13 01:34:35,912 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-13 01:34:35,913 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 01:34:35,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 01:34:35,913 INFO L85 PathProgramCache]: Analyzing trace with hash -1783789587, now seen corresponding path program 1 times [2021-11-13 01:34:35,914 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 01:34:35,914 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [990764880] [2021-11-13 01:34:35,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 01:34:35,914 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 01:34:35,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 01:34:35,968 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-13 01:34:35,969 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 01:34:35,969 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [990764880] [2021-11-13 01:34:35,969 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [990764880] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 01:34:35,970 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 01:34:35,970 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-13 01:34:35,973 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407114020] [2021-11-13 01:34:35,973 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 01:34:35,974 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-13 01:34:35,974 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 01:34:35,975 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-13 01:34:35,975 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-13 01:34:35,975 INFO L87 Difference]: Start difference. First operand 6350 states and 9755 transitions. Second operand has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:36,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 01:34:36,982 INFO L93 Difference]: Finished difference Result 14886 states and 22955 transitions. [2021-11-13 01:34:36,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-13 01:34:36,994 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2021-11-13 01:34:36,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 01:34:37,033 INFO L225 Difference]: With dead ends: 14886 [2021-11-13 01:34:37,034 INFO L226 Difference]: Without dead ends: 8594 [2021-11-13 01:34:37,044 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-13 01:34:37,045 INFO L933 BasicCegarLoop]: 145 mSDtfsCounter, 91 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 28.87ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 257 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.20ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 34.78ms IncrementalHoareTripleChecker+Time [2021-11-13 01:34:37,045 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 257 Invalid, 18 Unknown, 0 Unchecked, 1.20ms Time], IncrementalHoareTripleChecker [3 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 34.78ms Time] [2021-11-13 01:34:37,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8594 states. [2021-11-13 01:34:37,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8594 to 8592. [2021-11-13 01:34:37,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8592 states, 8591 states have (on average 1.5282272145268303) internal successors, (13129), 8591 states have internal predecessors, (13129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:37,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8592 states to 8592 states and 13129 transitions. [2021-11-13 01:34:37,897 INFO L78 Accepts]: Start accepts. Automaton has 8592 states and 13129 transitions. Word has length 75 [2021-11-13 01:34:37,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 01:34:37,897 INFO L470 AbstractCegarLoop]: Abstraction has 8592 states and 13129 transitions. [2021-11-13 01:34:37,898 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:37,898 INFO L276 IsEmpty]: Start isEmpty. Operand 8592 states and 13129 transitions. [2021-11-13 01:34:37,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-13 01:34:37,899 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 01:34:37,900 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 01:34:37,900 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-13 01:34:37,900 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 01:34:37,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 01:34:37,901 INFO L85 PathProgramCache]: Analyzing trace with hash -1046963442, now seen corresponding path program 1 times [2021-11-13 01:34:37,901 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 01:34:37,901 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [560026574] [2021-11-13 01:34:37,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 01:34:37,902 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 01:34:37,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 01:34:37,981 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-13 01:34:37,981 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 01:34:37,981 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [560026574] [2021-11-13 01:34:37,982 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [560026574] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 01:34:37,982 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 01:34:37,982 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-13 01:34:37,982 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502211645] [2021-11-13 01:34:37,983 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 01:34:37,983 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 01:34:37,983 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 01:34:37,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 01:34:37,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-13 01:34:37,984 INFO L87 Difference]: Start difference. First operand 8592 states and 13129 transitions. Second operand has 5 states, 5 states have (on average 15.0) internal successors, (75), 4 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:39,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 01:34:39,006 INFO L93 Difference]: Finished difference Result 17128 states and 26191 transitions. [2021-11-13 01:34:39,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 01:34:39,007 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 15.0) internal successors, (75), 4 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2021-11-13 01:34:39,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 01:34:39,036 INFO L225 Difference]: With dead ends: 17128 [2021-11-13 01:34:39,036 INFO L226 Difference]: Without dead ends: 8592 [2021-11-13 01:34:39,050 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-13 01:34:39,051 INFO L933 BasicCegarLoop]: 104 mSDtfsCounter, 334 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 50.15ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 334 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.65ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 59.75ms IncrementalHoareTripleChecker+Time [2021-11-13 01:34:39,052 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [334 Valid, 122 Invalid, 38 Unknown, 0 Unchecked, 1.65ms Time], IncrementalHoareTripleChecker [4 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 59.75ms Time] [2021-11-13 01:34:39,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8592 states. [2021-11-13 01:34:39,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8592 to 8592. [2021-11-13 01:34:39,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8592 states, 8591 states have (on average 1.511931090676289) internal successors, (12989), 8591 states have internal predecessors, (12989), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:39,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8592 states to 8592 states and 12989 transitions. [2021-11-13 01:34:39,933 INFO L78 Accepts]: Start accepts. Automaton has 8592 states and 12989 transitions. Word has length 78 [2021-11-13 01:34:39,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 01:34:39,934 INFO L470 AbstractCegarLoop]: Abstraction has 8592 states and 12989 transitions. [2021-11-13 01:34:39,934 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 15.0) internal successors, (75), 4 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:39,934 INFO L276 IsEmpty]: Start isEmpty. Operand 8592 states and 12989 transitions. [2021-11-13 01:34:39,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-13 01:34:39,936 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 01:34:39,936 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 01:34:39,936 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-13 01:34:39,937 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 01:34:39,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 01:34:39,937 INFO L85 PathProgramCache]: Analyzing trace with hash -1672225687, now seen corresponding path program 1 times [2021-11-13 01:34:39,938 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 01:34:39,938 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [55044135] [2021-11-13 01:34:39,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 01:34:39,938 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 01:34:39,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 01:34:40,685 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-13 01:34:40,685 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 01:34:40,685 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [55044135] [2021-11-13 01:34:40,685 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [55044135] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 01:34:40,685 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [332244841] [2021-11-13 01:34:40,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 01:34:40,686 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 01:34:40,686 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 01:34:40,687 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 01:34:40,708 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-13 01:34:40,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 01:34:40,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 390 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-13 01:34:40,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 01:34:41,791 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-13 01:34:41,791 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 01:34:42,459 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-13 01:34:42,460 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [332244841] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-13 01:34:42,460 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-13 01:34:42,460 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [10, 6] total 16 [2021-11-13 01:34:42,461 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289093954] [2021-11-13 01:34:42,461 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 01:34:42,461 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 01:34:42,461 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 01:34:42,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 01:34:42,462 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-13 01:34:42,462 INFO L87 Difference]: Start difference. First operand 8592 states and 12989 transitions. Second operand has 5 states, 5 states have (on average 14.8) internal successors, (74), 4 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:44,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 01:34:44,036 INFO L93 Difference]: Finished difference Result 24863 states and 37547 transitions. [2021-11-13 01:34:44,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 01:34:44,037 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 14.8) internal successors, (74), 4 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2021-11-13 01:34:44,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 01:34:44,092 INFO L225 Difference]: With dead ends: 24863 [2021-11-13 01:34:44,092 INFO L226 Difference]: Without dead ends: 16318 [2021-11-13 01:34:44,108 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 148 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-11-13 01:34:44,109 INFO L933 BasicCegarLoop]: 212 mSDtfsCounter, 324 mSDsluCounter, 118 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 38.69ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 324 SdHoareTripleChecker+Valid, 328 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.64ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 43.95ms IncrementalHoareTripleChecker+Time [2021-11-13 01:34:44,110 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [324 Valid, 328 Invalid, 23 Unknown, 0 Unchecked, 2.64ms Time], IncrementalHoareTripleChecker [1 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 43.95ms Time] [2021-11-13 01:34:44,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16318 states. [2021-11-13 01:34:45,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16318 to 16316. [2021-11-13 01:34:46,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16316 states, 16315 states have (on average 1.4984370211461846) internal successors, (24447), 16315 states have internal predecessors, (24447), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:46,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16316 states to 16316 states and 24447 transitions. [2021-11-13 01:34:46,055 INFO L78 Accepts]: Start accepts. Automaton has 16316 states and 24447 transitions. Word has length 78 [2021-11-13 01:34:46,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 01:34:46,055 INFO L470 AbstractCegarLoop]: Abstraction has 16316 states and 24447 transitions. [2021-11-13 01:34:46,056 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 14.8) internal successors, (74), 4 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:46,056 INFO L276 IsEmpty]: Start isEmpty. Operand 16316 states and 24447 transitions. [2021-11-13 01:34:46,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-13 01:34:46,058 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 01:34:46,058 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 01:34:46,112 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-13 01:34:46,272 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-13 01:34:46,272 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 01:34:46,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 01:34:46,273 INFO L85 PathProgramCache]: Analyzing trace with hash -139066846, now seen corresponding path program 1 times [2021-11-13 01:34:46,273 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 01:34:46,273 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [558846601] [2021-11-13 01:34:46,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 01:34:46,274 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 01:34:46,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 01:34:46,330 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-13 01:34:46,331 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 01:34:46,331 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [558846601] [2021-11-13 01:34:46,331 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [558846601] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 01:34:46,331 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 01:34:46,331 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-13 01:34:46,332 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924547240] [2021-11-13 01:34:46,332 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 01:34:46,333 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-13 01:34:46,333 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 01:34:46,333 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-13 01:34:46,333 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-13 01:34:46,334 INFO L87 Difference]: Start difference. First operand 16316 states and 24447 transitions. Second operand has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:48,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 01:34:48,351 INFO L93 Difference]: Finished difference Result 39544 states and 59605 transitions. [2021-11-13 01:34:48,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-13 01:34:48,352 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 79 [2021-11-13 01:34:48,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 01:34:48,421 INFO L225 Difference]: With dead ends: 39544 [2021-11-13 01:34:48,421 INFO L226 Difference]: Without dead ends: 23270 [2021-11-13 01:34:48,448 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-13 01:34:48,449 INFO L933 BasicCegarLoop]: 145 mSDtfsCounter, 95 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 34.19ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 254 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.24ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 40.16ms IncrementalHoareTripleChecker+Time [2021-11-13 01:34:48,449 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 254 Invalid, 19 Unknown, 0 Unchecked, 1.24ms Time], IncrementalHoareTripleChecker [3 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 40.16ms Time] [2021-11-13 01:34:48,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23270 states. [2021-11-13 01:34:50,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23270 to 23268. [2021-11-13 01:34:50,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23268 states, 23267 states have (on average 1.4917694588902737) internal successors, (34709), 23267 states have internal predecessors, (34709), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:50,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23268 states to 23268 states and 34709 transitions. [2021-11-13 01:34:50,801 INFO L78 Accepts]: Start accepts. Automaton has 23268 states and 34709 transitions. Word has length 79 [2021-11-13 01:34:50,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 01:34:50,801 INFO L470 AbstractCegarLoop]: Abstraction has 23268 states and 34709 transitions. [2021-11-13 01:34:50,801 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:50,801 INFO L276 IsEmpty]: Start isEmpty. Operand 23268 states and 34709 transitions. [2021-11-13 01:34:50,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-13 01:34:50,803 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 01:34:50,803 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 01:34:50,803 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-13 01:34:50,804 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 01:34:50,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 01:34:50,804 INFO L85 PathProgramCache]: Analyzing trace with hash -216121986, now seen corresponding path program 1 times [2021-11-13 01:34:50,805 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 01:34:50,805 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1158319095] [2021-11-13 01:34:50,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 01:34:50,805 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 01:34:50,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 01:34:52,696 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-13 01:34:52,696 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 01:34:52,696 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1158319095] [2021-11-13 01:34:52,696 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1158319095] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 01:34:52,697 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1092085415] [2021-11-13 01:34:52,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 01:34:52,697 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 01:34:52,697 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 01:34:52,701 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 01:34:52,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-13 01:34:52,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 01:34:52,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 397 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-13 01:34:52,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 01:34:53,874 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-13 01:34:53,874 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 01:34:54,594 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-13 01:34:54,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1092085415] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-13 01:34:54,595 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-13 01:34:54,595 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [10, 6] total 16 [2021-11-13 01:34:54,595 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2046999119] [2021-11-13 01:34:54,595 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 01:34:54,598 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 01:34:54,599 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 01:34:54,599 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 01:34:54,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-11-13 01:34:54,600 INFO L87 Difference]: Start difference. First operand 23268 states and 34709 transitions. Second operand has 5 states, 5 states have (on average 16.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:34:59,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 01:34:59,737 INFO L93 Difference]: Finished difference Result 68056 states and 101415 transitions. [2021-11-13 01:34:59,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 01:34:59,738 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 16.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2021-11-13 01:34:59,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 01:34:59,838 INFO L225 Difference]: With dead ends: 68056 [2021-11-13 01:34:59,838 INFO L226 Difference]: Without dead ends: 44882 [2021-11-13 01:34:59,872 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 156 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-11-13 01:34:59,873 INFO L933 BasicCegarLoop]: 210 mSDtfsCounter, 301 mSDsluCounter, 118 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 37.05ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 301 SdHoareTripleChecker+Valid, 326 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.67ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 44.68ms IncrementalHoareTripleChecker+Time [2021-11-13 01:34:59,873 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [301 Valid, 326 Invalid, 25 Unknown, 0 Unchecked, 2.67ms Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 44.68ms Time] [2021-11-13 01:34:59,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44882 states. [2021-11-13 01:35:04,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44882 to 44880. [2021-11-13 01:35:05,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44880 states, 44879 states have (on average 1.481784353483812) internal successors, (66501), 44879 states have internal predecessors, (66501), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:35:05,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44880 states to 44880 states and 66501 transitions. [2021-11-13 01:35:05,128 INFO L78 Accepts]: Start accepts. Automaton has 44880 states and 66501 transitions. Word has length 82 [2021-11-13 01:35:05,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 01:35:05,131 INFO L470 AbstractCegarLoop]: Abstraction has 44880 states and 66501 transitions. [2021-11-13 01:35:05,131 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 16.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:35:05,131 INFO L276 IsEmpty]: Start isEmpty. Operand 44880 states and 66501 transitions. [2021-11-13 01:35:05,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-13 01:35:05,134 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 01:35:05,134 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 01:35:05,187 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-13 01:35:05,354 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 01:35:05,355 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 01:35:05,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 01:35:05,355 INFO L85 PathProgramCache]: Analyzing trace with hash 895804263, now seen corresponding path program 1 times [2021-11-13 01:35:05,355 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 01:35:05,356 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1746138651] [2021-11-13 01:35:05,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 01:35:05,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 01:35:05,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 01:35:05,410 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-13 01:35:05,411 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 01:35:05,411 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1746138651] [2021-11-13 01:35:05,411 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1746138651] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 01:35:05,411 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 01:35:05,412 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-13 01:35:05,413 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1520678662] [2021-11-13 01:35:05,413 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 01:35:05,414 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-13 01:35:05,414 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 01:35:05,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-13 01:35:05,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-13 01:35:05,415 INFO L87 Difference]: Start difference. First operand 44880 states and 66501 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:35:12,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 01:35:12,177 INFO L93 Difference]: Finished difference Result 104796 states and 155759 transitions. [2021-11-13 01:35:12,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-13 01:35:12,178 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2021-11-13 01:35:12,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 01:35:12,336 INFO L225 Difference]: With dead ends: 104796 [2021-11-13 01:35:12,336 INFO L226 Difference]: Without dead ends: 60010 [2021-11-13 01:35:12,390 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-13 01:35:12,393 INFO L933 BasicCegarLoop]: 147 mSDtfsCounter, 75 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 32.19ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 258 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.18ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 38.16ms IncrementalHoareTripleChecker+Time [2021-11-13 01:35:12,394 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 258 Invalid, 17 Unknown, 0 Unchecked, 1.18ms Time], IncrementalHoareTripleChecker [3 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 38.16ms Time] [2021-11-13 01:35:12,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60010 states. [2021-11-13 01:35:19,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60010 to 60008. [2021-11-13 01:35:19,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60008 states, 60007 states have (on average 1.4736447414468312) internal successors, (88429), 60007 states have internal predecessors, (88429), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:35:19,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60008 states to 60008 states and 88429 transitions. [2021-11-13 01:35:19,323 INFO L78 Accepts]: Start accepts. Automaton has 60008 states and 88429 transitions. Word has length 83 [2021-11-13 01:35:19,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 01:35:19,323 INFO L470 AbstractCegarLoop]: Abstraction has 60008 states and 88429 transitions. [2021-11-13 01:35:19,323 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-13 01:35:19,323 INFO L276 IsEmpty]: Start isEmpty. Operand 60008 states and 88429 transitions. [2021-11-13 01:35:19,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-13 01:35:19,326 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 01:35:19,326 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 01:35:19,326 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-13 01:35:19,327 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 01:35:19,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 01:35:19,327 INFO L85 PathProgramCache]: Analyzing trace with hash 1934718099, now seen corresponding path program 1 times [2021-11-13 01:35:19,328 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 01:35:19,328 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [949797583] [2021-11-13 01:35:19,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 01:35:19,328 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 01:35:19,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 01:35:20,277 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-13 01:35:20,278 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 01:35:20,278 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [949797583] [2021-11-13 01:35:20,278 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [949797583] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 01:35:20,278 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [475807656] [2021-11-13 01:35:20,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 01:35:20,279 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 01:35:20,279 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 01:35:20,284 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 01:35:20,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6794c8ca-4155-45cd-9711-28028c8bfe77/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-13 01:35:20,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 01:35:20,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-13 01:35:20,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 01:35:21,741 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-13 01:35:21,742 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 01:35:22,502 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-13 01:35:22,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [475807656] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-13 01:35:22,503 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-13 01:35:22,503 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [10, 7] total 18 [2021-11-13 01:35:22,504 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859624042] [2021-11-13 01:35:22,504 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 01:35:22,505 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 01:35:22,505 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 01:35:22,505 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 01:35:22,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-11-13 01:35:22,506 INFO L87 Difference]: Start difference. First operand 60008 states and 88429 transitions. Second operand has 5 states, 5 states have (on average 16.6) internal successors, (83), 4 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)