./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/token_ring.03.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/token_ring.03.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V --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 4996a252ab084c920e1b9a19c3119ce328d4cb97d6d45029062c9dac50449e19 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:42:42,274 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:42:42,278 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:42:42,343 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:42:42,344 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:42:42,349 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:42:42,351 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:42:42,356 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:42:42,359 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:42:42,365 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:42:42,367 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:42:42,369 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:42:42,369 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:42:42,373 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:42:42,375 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:42:42,381 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:42:42,383 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:42:42,384 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:42:42,387 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:42:42,398 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:42:42,400 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:42:42,402 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:42:42,406 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:42:42,407 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:42:42,411 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:42:42,412 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:42:42,413 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:42:42,415 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:42:42,416 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:42:42,418 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:42:42,418 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:42:42,419 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:42:42,422 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:42:42,423 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:42:42,425 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:42:42,425 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:42:42,426 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:42:42,427 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:42:42,427 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:42:42,428 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:42:42,429 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:42:42,430 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:42:42,478 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:42:42,478 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:42:42,479 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:42:42,479 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:42:42,480 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:42:42,487 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:42:42,488 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:42:42,488 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:42:42,488 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:42:42,488 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:42:42,490 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:42:42,490 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:42:42,490 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:42:42,491 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:42:42,491 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:42:42,491 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:42:42,492 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:42:42,492 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:42:42,493 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:42:42,493 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:42:42,493 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:42:42,493 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:42:42,494 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:42:42,494 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:42:42,494 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:42:42,494 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:42:42,495 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:42:42,495 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:42:42,496 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:42:42,496 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:42:42,496 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:42:42,497 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:42:42,497 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:42:42,497 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:42:42,497 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:42:42,498 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:42:42,498 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:42:42,498 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:42:42,498 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:42:42,499 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:42:42,499 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:42:42,499 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_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4996a252ab084c920e1b9a19c3119ce328d4cb97d6d45029062c9dac50449e19 [2021-11-23 02:42:42,775 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:42:42,801 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:42:42,805 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:42:42,806 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:42:42,807 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:42:42,809 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/systemc/token_ring.03.cil-2.c [2021-11-23 02:42:42,892 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/data/534b33deb/8c732ee403bd4ec8889521ffe0bafbc9/FLAGa447649cf [2021-11-23 02:42:43,435 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:42:43,451 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/sv-benchmarks/c/systemc/token_ring.03.cil-2.c [2021-11-23 02:42:43,472 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/data/534b33deb/8c732ee403bd4ec8889521ffe0bafbc9/FLAGa447649cf [2021-11-23 02:42:43,747 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/data/534b33deb/8c732ee403bd4ec8889521ffe0bafbc9 [2021-11-23 02:42:43,750 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:42:43,751 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:42:43,753 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:42:43,754 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:42:43,757 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:42:43,758 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:42:43" (1/1) ... [2021-11-23 02:42:43,759 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1bca1d9b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:42:43, skipping insertion in model container [2021-11-23 02:42:43,760 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:42:43" (1/1) ... [2021-11-23 02:42:43,767 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:42:43,802 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:42:43,977 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/sv-benchmarks/c/systemc/token_ring.03.cil-2.c[671,684] [2021-11-23 02:42:44,048 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:42:44,057 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:42:44,083 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/sv-benchmarks/c/systemc/token_ring.03.cil-2.c[671,684] [2021-11-23 02:42:44,166 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:42:44,203 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:42:44,203 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:42:44 WrapperNode [2021-11-23 02:42:44,203 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:42:44,205 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:42:44,205 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:42:44,205 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:42:44,213 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:42:44" (1/1) ... [2021-11-23 02:42:44,237 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:42:44" (1/1) ... [2021-11-23 02:42:44,293 INFO L137 Inliner]: procedures = 34, calls = 40, calls flagged for inlining = 18, calls inlined = 18, statements flattened = 331 [2021-11-23 02:42:44,300 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:42:44,301 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:42:44,301 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:42:44,301 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:42:44,311 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:42:44" (1/1) ... [2021-11-23 02:42:44,312 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:42:44" (1/1) ... [2021-11-23 02:42:44,323 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:42:44" (1/1) ... [2021-11-23 02:42:44,324 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:42:44" (1/1) ... [2021-11-23 02:42:44,338 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:42:44" (1/1) ... [2021-11-23 02:42:44,352 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:42:44" (1/1) ... [2021-11-23 02:42:44,361 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:42:44" (1/1) ... [2021-11-23 02:42:44,365 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:42:44,379 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:42:44,383 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:42:44,384 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:42:44,385 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:42:44" (1/1) ... [2021-11-23 02:42:44,397 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:42:44,410 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:42:44,423 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:42:44,428 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:42:44,472 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:42:44,473 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-23 02:42:44,473 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-23 02:42:44,473 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-23 02:42:44,473 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-23 02:42:44,473 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-23 02:42:44,474 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-23 02:42:44,474 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-23 02:42:44,474 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-23 02:42:44,474 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-23 02:42:44,474 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-23 02:42:44,475 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:42:44,475 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-23 02:42:44,475 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-23 02:42:44,475 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:42:44,475 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:42:44,563 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:42:44,565 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:42:45,002 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:42:45,232 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:42:45,233 INFO L301 CfgBuilder]: Removed 6 assume(true) statements. [2021-11-23 02:42:45,236 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:42:45 BoogieIcfgContainer [2021-11-23 02:42:45,236 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:42:45,238 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:42:45,239 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:42:45,242 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:42:45,243 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:42:43" (1/3) ... [2021-11-23 02:42:45,244 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3af37d62 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:42:45, skipping insertion in model container [2021-11-23 02:42:45,244 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:42:44" (2/3) ... [2021-11-23 02:42:45,244 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3af37d62 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:42:45, skipping insertion in model container [2021-11-23 02:42:45,245 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:42:45" (3/3) ... [2021-11-23 02:42:45,246 INFO L111 eAbstractionObserver]: Analyzing ICFG token_ring.03.cil-2.c [2021-11-23 02:42:45,253 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:42:45,253 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:42:45,309 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:42:45,318 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 [2021-11-23 02:42:45,319 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:42:45,343 INFO L276 IsEmpty]: Start isEmpty. Operand has 89 states, 64 states have (on average 1.5) internal successors, (96), 66 states have internal predecessors, (96), 17 states have call successors, (17), 6 states have call predecessors, (17), 6 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-23 02:42:45,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-23 02:42:45,353 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:42:45,354 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] [2021-11-23 02:42:45,354 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:42:45,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:42:45,362 INFO L85 PathProgramCache]: Analyzing trace with hash 988164258, now seen corresponding path program 1 times [2021-11-23 02:42:45,374 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:42:45,375 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [712459334] [2021-11-23 02:42:45,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:42:45,377 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:42:45,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:42:45,633 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:42:45,634 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:42:45,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [712459334] [2021-11-23 02:42:45,635 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [712459334] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:42:45,635 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:42:45,635 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:42:45,637 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [834479687] [2021-11-23 02:42:45,652 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:42:45,657 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:42:45,657 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:42:45,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:42:45,710 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:42:45,714 INFO L87 Difference]: Start difference. First operand has 89 states, 64 states have (on average 1.5) internal successors, (96), 66 states have internal predecessors, (96), 17 states have call successors, (17), 6 states have call predecessors, (17), 6 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) Second operand has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 02:42:46,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:42:46,125 INFO L93 Difference]: Finished difference Result 251 states and 373 transitions. [2021-11-23 02:42:46,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:42:46,128 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 39 [2021-11-23 02:42:46,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:42:46,139 INFO L225 Difference]: With dead ends: 251 [2021-11-23 02:42:46,140 INFO L226 Difference]: Without dead ends: 163 [2021-11-23 02:42:46,144 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:42:46,148 INFO L933 BasicCegarLoop]: 184 mSDtfsCounter, 215 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 215 SdHoareTripleChecker+Valid, 306 SdHoareTripleChecker+Invalid, 171 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:42:46,150 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [215 Valid, 306 Invalid, 171 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 160 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:42:46,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2021-11-23 02:42:46,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 162. [2021-11-23 02:42:46,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 119 states have (on average 1.411764705882353) internal successors, (168), 121 states have internal predecessors, (168), 30 states have call successors, (30), 12 states have call predecessors, (30), 12 states have return successors, (30), 29 states have call predecessors, (30), 30 states have call successors, (30) [2021-11-23 02:42:46,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 228 transitions. [2021-11-23 02:42:46,227 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 228 transitions. Word has length 39 [2021-11-23 02:42:46,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:42:46,228 INFO L470 AbstractCegarLoop]: Abstraction has 162 states and 228 transitions. [2021-11-23 02:42:46,228 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 02:42:46,228 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 228 transitions. [2021-11-23 02:42:46,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-23 02:42:46,234 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:42:46,234 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:42:46,235 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:42:46,235 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:42:46,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:42:46,236 INFO L85 PathProgramCache]: Analyzing trace with hash 39532403, now seen corresponding path program 1 times [2021-11-23 02:42:46,237 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:42:46,237 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2079980187] [2021-11-23 02:42:46,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:42:46,237 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:42:46,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:42:46,417 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 02:42:46,417 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:42:46,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2079980187] [2021-11-23 02:42:46,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2079980187] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:42:46,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1580703640] [2021-11-23 02:42:46,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:42:46,419 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:42:46,419 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:42:46,423 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:42:46,427 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:42:46,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:42:46,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 386 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:42:46,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:42:46,817 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:42:46,817 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:42:46,817 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1580703640] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:42:46,818 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:42:46,818 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2021-11-23 02:42:46,819 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152797237] [2021-11-23 02:42:46,819 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:42:46,820 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:42:46,821 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:42:46,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:42:46,822 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:42:46,822 INFO L87 Difference]: Start difference. First operand 162 states and 228 transitions. Second operand has 3 states, 3 states have (on average 15.0) internal successors, (45), 2 states have internal predecessors, (45), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:42:46,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:42:46,933 INFO L93 Difference]: Finished difference Result 469 states and 669 transitions. [2021-11-23 02:42:46,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:42:46,934 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 2 states have internal predecessors, (45), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 72 [2021-11-23 02:42:46,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:42:46,941 INFO L225 Difference]: With dead ends: 469 [2021-11-23 02:42:46,941 INFO L226 Difference]: Without dead ends: 312 [2021-11-23 02:42:46,944 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:42:46,946 INFO L933 BasicCegarLoop]: 135 mSDtfsCounter, 100 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 226 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:42:46,947 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [100 Valid, 226 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:42:46,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2021-11-23 02:42:47,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 308. [2021-11-23 02:42:47,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 308 states, 229 states have (on average 1.4017467248908297) internal successors, (321), 232 states have internal predecessors, (321), 54 states have call successors, (54), 24 states have call predecessors, (54), 24 states have return successors, (54), 52 states have call predecessors, (54), 54 states have call successors, (54) [2021-11-23 02:42:47,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 308 states to 308 states and 429 transitions. [2021-11-23 02:42:47,049 INFO L78 Accepts]: Start accepts. Automaton has 308 states and 429 transitions. Word has length 72 [2021-11-23 02:42:47,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:42:47,050 INFO L470 AbstractCegarLoop]: Abstraction has 308 states and 429 transitions. [2021-11-23 02:42:47,050 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 2 states have internal predecessors, (45), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:42:47,051 INFO L276 IsEmpty]: Start isEmpty. Operand 308 states and 429 transitions. [2021-11-23 02:42:47,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-23 02:42:47,058 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:42:47,059 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:42:47,102 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:42:47,287 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:42:47,288 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:42:47,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:42:47,288 INFO L85 PathProgramCache]: Analyzing trace with hash 686067441, now seen corresponding path program 1 times [2021-11-23 02:42:47,289 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:42:47,289 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [164085440] [2021-11-23 02:42:47,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:42:47,290 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:42:47,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:42:47,389 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 02:42:47,390 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:42:47,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [164085440] [2021-11-23 02:42:47,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [164085440] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:42:47,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [640413024] [2021-11-23 02:42:47,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:42:47,391 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:42:47,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:42:47,392 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:42:47,411 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:42:47,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:42:47,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:42:47,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:42:47,663 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 02:42:47,663 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:42:47,663 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [640413024] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:42:47,664 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:42:47,664 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:42:47,664 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1728366987] [2021-11-23 02:42:47,665 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:42:47,665 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:42:47,665 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:42:47,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:42:47,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:42:47,667 INFO L87 Difference]: Start difference. First operand 308 states and 429 transitions. Second operand has 3 states, 3 states have (on average 16.0) internal successors, (48), 2 states have internal predecessors, (48), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:42:47,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:42:47,821 INFO L93 Difference]: Finished difference Result 901 states and 1272 transitions. [2021-11-23 02:42:47,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:42:47,822 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 2 states have internal predecessors, (48), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 72 [2021-11-23 02:42:47,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:42:47,835 INFO L225 Difference]: With dead ends: 901 [2021-11-23 02:42:47,835 INFO L226 Difference]: Without dead ends: 598 [2021-11-23 02:42:47,842 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:42:47,846 INFO L933 BasicCegarLoop]: 134 mSDtfsCounter, 97 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:42:47,848 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [97 Valid, 225 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:42:47,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 598 states. [2021-11-23 02:42:47,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 598 to 592. [2021-11-23 02:42:47,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 592 states, 443 states have (on average 1.3882618510158014) internal successors, (615), 448 states have internal predecessors, (615), 100 states have call successors, (100), 48 states have call predecessors, (100), 48 states have return successors, (100), 96 states have call predecessors, (100), 100 states have call successors, (100) [2021-11-23 02:42:47,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 592 states to 592 states and 815 transitions. [2021-11-23 02:42:47,946 INFO L78 Accepts]: Start accepts. Automaton has 592 states and 815 transitions. Word has length 72 [2021-11-23 02:42:47,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:42:47,947 INFO L470 AbstractCegarLoop]: Abstraction has 592 states and 815 transitions. [2021-11-23 02:42:47,947 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 2 states have internal predecessors, (48), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:42:47,947 INFO L276 IsEmpty]: Start isEmpty. Operand 592 states and 815 transitions. [2021-11-23 02:42:47,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-23 02:42:47,959 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:42:47,959 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:42:47,998 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:42:48,179 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:42:48,179 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:42:48,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:42:48,180 INFO L85 PathProgramCache]: Analyzing trace with hash 1192269875, now seen corresponding path program 1 times [2021-11-23 02:42:48,180 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:42:48,181 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1726158489] [2021-11-23 02:42:48,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:42:48,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:42:48,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:42:48,393 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:42:48,393 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:42:48,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1726158489] [2021-11-23 02:42:48,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1726158489] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:42:48,394 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:42:48,394 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:42:48,395 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1855502965] [2021-11-23 02:42:48,395 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:42:48,395 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:42:48,396 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:42:48,396 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:42:48,397 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:42:48,397 INFO L87 Difference]: Start difference. First operand 592 states and 815 transitions. Second operand has 6 states, 6 states have (on average 7.0) internal successors, (42), 6 states have internal predecessors, (42), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 02:42:48,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:42:48,792 INFO L93 Difference]: Finished difference Result 1876 states and 2586 transitions. [2021-11-23 02:42:48,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 02:42:48,793 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 7.0) internal successors, (42), 6 states have internal predecessors, (42), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 72 [2021-11-23 02:42:48,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:42:48,812 INFO L225 Difference]: With dead ends: 1876 [2021-11-23 02:42:48,812 INFO L226 Difference]: Without dead ends: 1290 [2021-11-23 02:42:48,815 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:42:48,819 INFO L933 BasicCegarLoop]: 119 mSDtfsCounter, 321 mSDsluCounter, 265 mSDsCounter, 0 mSdLazyCounter, 206 mSolverCounterSat, 92 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 333 SdHoareTripleChecker+Valid, 341 SdHoareTripleChecker+Invalid, 298 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:42:48,822 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [333 Valid, 341 Invalid, 298 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [92 Valid, 206 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:42:48,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1290 states. [2021-11-23 02:42:48,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1290 to 1128. [2021-11-23 02:42:48,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1128 states, 843 states have (on average 1.3701067615658362) internal successors, (1155), 852 states have internal predecessors, (1155), 188 states have call successors, (188), 96 states have call predecessors, (188), 96 states have return successors, (188), 180 states have call predecessors, (188), 188 states have call successors, (188) [2021-11-23 02:42:48,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1128 states to 1128 states and 1531 transitions. [2021-11-23 02:42:48,972 INFO L78 Accepts]: Start accepts. Automaton has 1128 states and 1531 transitions. Word has length 72 [2021-11-23 02:42:48,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:42:48,974 INFO L470 AbstractCegarLoop]: Abstraction has 1128 states and 1531 transitions. [2021-11-23 02:42:48,978 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 7.0) internal successors, (42), 6 states have internal predecessors, (42), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 02:42:48,979 INFO L276 IsEmpty]: Start isEmpty. Operand 1128 states and 1531 transitions. [2021-11-23 02:42:48,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-23 02:42:48,985 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:42:48,986 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:42:48,986 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 02:42:48,987 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:42:48,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:42:48,990 INFO L85 PathProgramCache]: Analyzing trace with hash 1395425187, now seen corresponding path program 1 times [2021-11-23 02:42:48,995 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:42:48,995 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2057438399] [2021-11-23 02:42:48,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:42:48,996 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:42:49,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:42:49,189 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:42:49,189 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:42:49,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2057438399] [2021-11-23 02:42:49,190 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2057438399] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:42:49,190 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:42:49,190 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:42:49,191 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130939066] [2021-11-23 02:42:49,199 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:42:49,200 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:42:49,200 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:42:49,201 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:42:49,201 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:42:49,201 INFO L87 Difference]: Start difference. First operand 1128 states and 1531 transitions. Second operand has 6 states, 6 states have (on average 7.166666666666667) internal successors, (43), 6 states have internal predecessors, (43), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 02:42:49,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:42:49,607 INFO L93 Difference]: Finished difference Result 2884 states and 3933 transitions. [2021-11-23 02:42:49,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 02:42:49,608 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 7.166666666666667) internal successors, (43), 6 states have internal predecessors, (43), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 73 [2021-11-23 02:42:49,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:42:49,622 INFO L225 Difference]: With dead ends: 2884 [2021-11-23 02:42:49,622 INFO L226 Difference]: Without dead ends: 1762 [2021-11-23 02:42:49,625 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:42:49,626 INFO L933 BasicCegarLoop]: 107 mSDtfsCounter, 294 mSDsluCounter, 260 mSDsCounter, 0 mSdLazyCounter, 198 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 300 SdHoareTripleChecker+Valid, 329 SdHoareTripleChecker+Invalid, 298 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:42:49,627 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [300 Valid, 329 Invalid, 298 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 198 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:42:49,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1762 states. [2021-11-23 02:42:49,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1762 to 1656. [2021-11-23 02:42:49,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1656 states, 1235 states have (on average 1.3562753036437247) internal successors, (1675), 1248 states have internal predecessors, (1675), 276 states have call successors, (276), 144 states have call predecessors, (276), 144 states have return successors, (276), 264 states have call predecessors, (276), 276 states have call successors, (276) [2021-11-23 02:42:49,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1656 states to 1656 states and 2227 transitions. [2021-11-23 02:42:49,759 INFO L78 Accepts]: Start accepts. Automaton has 1656 states and 2227 transitions. Word has length 73 [2021-11-23 02:42:49,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:42:49,759 INFO L470 AbstractCegarLoop]: Abstraction has 1656 states and 2227 transitions. [2021-11-23 02:42:49,760 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 7.166666666666667) internal successors, (43), 6 states have internal predecessors, (43), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 02:42:49,760 INFO L276 IsEmpty]: Start isEmpty. Operand 1656 states and 2227 transitions. [2021-11-23 02:42:49,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-23 02:42:49,764 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:42:49,764 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:42:49,764 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 02:42:49,765 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:42:49,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:42:49,765 INFO L85 PathProgramCache]: Analyzing trace with hash 362479671, now seen corresponding path program 1 times [2021-11-23 02:42:49,766 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:42:49,766 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [967228528] [2021-11-23 02:42:49,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:42:49,766 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:42:49,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:42:49,816 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:42:49,816 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:42:49,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [967228528] [2021-11-23 02:42:49,817 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [967228528] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:42:49,817 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:42:49,817 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:42:49,817 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [64717539] [2021-11-23 02:42:49,817 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:42:49,818 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:42:49,818 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:42:49,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:42:49,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:42:49,819 INFO L87 Difference]: Start difference. First operand 1656 states and 2227 transitions. Second operand has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 02:42:50,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:42:50,042 INFO L93 Difference]: Finished difference Result 2914 states and 3962 transitions. [2021-11-23 02:42:50,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:42:50,045 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 74 [2021-11-23 02:42:50,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:42:50,061 INFO L225 Difference]: With dead ends: 2914 [2021-11-23 02:42:50,061 INFO L226 Difference]: Without dead ends: 2064 [2021-11-23 02:42:50,067 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 [2021-11-23 02:42:50,071 INFO L933 BasicCegarLoop]: 151 mSDtfsCounter, 45 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 255 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:42:50,071 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 255 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:42:50,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2064 states. [2021-11-23 02:42:50,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2064 to 1870. [2021-11-23 02:42:50,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1870 states, 1425 states have (on average 1.3803508771929824) internal successors, (1967), 1438 states have internal predecessors, (1967), 288 states have call successors, (288), 156 states have call predecessors, (288), 156 states have return successors, (288), 276 states have call predecessors, (288), 288 states have call successors, (288) [2021-11-23 02:42:50,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1870 states to 1870 states and 2543 transitions. [2021-11-23 02:42:50,233 INFO L78 Accepts]: Start accepts. Automaton has 1870 states and 2543 transitions. Word has length 74 [2021-11-23 02:42:50,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:42:50,234 INFO L470 AbstractCegarLoop]: Abstraction has 1870 states and 2543 transitions. [2021-11-23 02:42:50,234 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 02:42:50,235 INFO L276 IsEmpty]: Start isEmpty. Operand 1870 states and 2543 transitions. [2021-11-23 02:42:50,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-23 02:42:50,246 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:42:50,246 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:42:50,247 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 02:42:50,247 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:42:50,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:42:50,247 INFO L85 PathProgramCache]: Analyzing trace with hash -1643608469, now seen corresponding path program 1 times [2021-11-23 02:42:50,248 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:42:50,250 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1056330470] [2021-11-23 02:42:50,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:42:50,250 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:42:50,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:42:50,316 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 02:42:50,316 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:42:50,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1056330470] [2021-11-23 02:42:50,318 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1056330470] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:42:50,318 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:42:50,318 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:42:50,318 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807082237] [2021-11-23 02:42:50,319 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:42:50,320 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:42:50,320 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:42:50,320 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:42:50,321 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:42:50,321 INFO L87 Difference]: Start difference. First operand 1870 states and 2543 transitions. Second operand has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:42:50,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:42:50,561 INFO L93 Difference]: Finished difference Result 4662 states and 6380 transitions. [2021-11-23 02:42:50,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:42:50,562 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 96 [2021-11-23 02:42:50,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:42:50,583 INFO L225 Difference]: With dead ends: 4662 [2021-11-23 02:42:50,583 INFO L226 Difference]: Without dead ends: 2797 [2021-11-23 02:42:50,590 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 [2021-11-23 02:42:50,591 INFO L933 BasicCegarLoop]: 135 mSDtfsCounter, 93 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 226 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:42:50,592 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [93 Valid, 226 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:42:50,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2797 states. [2021-11-23 02:42:50,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2797 to 2777. [2021-11-23 02:42:50,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2777 states, 2118 states have (on average 1.3640226628895185) internal successors, (2889), 2137 states have internal predecessors, (2889), 424 states have call successors, (424), 234 states have call predecessors, (424), 234 states have return successors, (424), 406 states have call predecessors, (424), 424 states have call successors, (424) [2021-11-23 02:42:50,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2777 states to 2777 states and 3737 transitions. [2021-11-23 02:42:50,832 INFO L78 Accepts]: Start accepts. Automaton has 2777 states and 3737 transitions. Word has length 96 [2021-11-23 02:42:50,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:42:50,833 INFO L470 AbstractCegarLoop]: Abstraction has 2777 states and 3737 transitions. [2021-11-23 02:42:50,833 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:42:50,833 INFO L276 IsEmpty]: Start isEmpty. Operand 2777 states and 3737 transitions. [2021-11-23 02:42:50,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 02:42:50,846 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:42:50,848 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:42:50,849 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 02:42:50,849 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:42:50,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:42:50,850 INFO L85 PathProgramCache]: Analyzing trace with hash -779664507, now seen corresponding path program 1 times [2021-11-23 02:42:50,850 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:42:50,850 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1866752193] [2021-11-23 02:42:50,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:42:50,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:42:50,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:42:50,971 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-23 02:42:50,971 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:42:50,971 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1866752193] [2021-11-23 02:42:50,972 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1866752193] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:42:50,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [367929668] [2021-11-23 02:42:50,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:42:50,972 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:42:50,973 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:42:50,975 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:42:50,999 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:42:51,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:42:51,106 INFO L263 TraceCheckSpWp]: Trace formula consists of 525 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:42:51,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:42:51,271 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 56 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 02:42:51,271 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:42:51,271 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [367929668] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:42:51,271 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:42:51,272 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-23 02:42:51,272 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [676958983] [2021-11-23 02:42:51,272 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:42:51,272 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:42:51,273 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:42:51,273 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:42:51,273 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:42:51,273 INFO L87 Difference]: Start difference. First operand 2777 states and 3737 transitions. Second operand has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 3 states have internal predecessors, (76), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:42:51,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:42:51,513 INFO L93 Difference]: Finished difference Result 5252 states and 7137 transitions. [2021-11-23 02:42:51,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:42:51,514 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 3 states have internal predecessors, (76), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 111 [2021-11-23 02:42:51,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:42:51,539 INFO L225 Difference]: With dead ends: 5252 [2021-11-23 02:42:51,539 INFO L226 Difference]: Without dead ends: 3400 [2021-11-23 02:42:51,546 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:42:51,546 INFO L933 BasicCegarLoop]: 160 mSDtfsCounter, 60 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 266 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:42:51,547 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 266 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:42:51,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3400 states. [2021-11-23 02:42:51,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3400 to 3068. [2021-11-23 02:42:51,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3068 states, 2373 states have (on average 1.381795195954488) internal successors, (3279), 2392 states have internal predecessors, (3279), 442 states have call successors, (442), 252 states have call predecessors, (442), 252 states have return successors, (442), 424 states have call predecessors, (442), 442 states have call successors, (442) [2021-11-23 02:42:51,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3068 states to 3068 states and 4163 transitions. [2021-11-23 02:42:51,757 INFO L78 Accepts]: Start accepts. Automaton has 3068 states and 4163 transitions. Word has length 111 [2021-11-23 02:42:51,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:42:51,758 INFO L470 AbstractCegarLoop]: Abstraction has 3068 states and 4163 transitions. [2021-11-23 02:42:51,758 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 3 states have internal predecessors, (76), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:42:51,758 INFO L276 IsEmpty]: Start isEmpty. Operand 3068 states and 4163 transitions. [2021-11-23 02:42:51,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-23 02:42:51,770 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:42:51,770 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:42:51,810 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:42:51,995 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:42:51,995 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:42:51,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:42:51,996 INFO L85 PathProgramCache]: Analyzing trace with hash -1152981882, now seen corresponding path program 2 times [2021-11-23 02:42:51,996 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:42:51,996 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [571081973] [2021-11-23 02:42:51,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:42:51,996 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:42:52,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:42:52,074 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 10 proven. 25 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-23 02:42:52,074 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:42:52,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [571081973] [2021-11-23 02:42:52,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [571081973] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:42:52,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1308888639] [2021-11-23 02:42:52,075 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:42:52,076 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:42:52,076 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:42:52,077 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:42:52,095 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:42:52,228 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 02:42:52,228 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:42:52,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 482 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 02:42:52,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:42:52,657 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 16 proven. 6 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 02:42:52,658 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:42:53,407 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-23 02:42:53,407 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1308888639] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:42:53,408 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:42:53,408 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 6] total 13 [2021-11-23 02:42:53,408 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [712971215] [2021-11-23 02:42:53,408 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:42:53,409 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:42:53,409 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:42:53,410 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:42:53,410 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:42:53,410 INFO L87 Difference]: Start difference. First operand 3068 states and 4163 transitions. Second operand has 6 states, 6 states have (on average 10.0) internal successors, (60), 6 states have internal predecessors, (60), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-11-23 02:42:53,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:42:53,903 INFO L93 Difference]: Finished difference Result 7527 states and 10177 transitions. [2021-11-23 02:42:53,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:42:53,904 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.0) internal successors, (60), 6 states have internal predecessors, (60), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) Word has length 111 [2021-11-23 02:42:53,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:42:53,942 INFO L225 Difference]: With dead ends: 7527 [2021-11-23 02:42:53,943 INFO L226 Difference]: Without dead ends: 4465 [2021-11-23 02:42:53,953 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 219 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2021-11-23 02:42:53,955 INFO L933 BasicCegarLoop]: 121 mSDtfsCounter, 313 mSDsluCounter, 143 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 110 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 325 SdHoareTripleChecker+Valid, 241 SdHoareTripleChecker+Invalid, 192 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 110 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:42:53,956 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [325 Valid, 241 Invalid, 192 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [110 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:42:53,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4465 states. [2021-11-23 02:42:54,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4465 to 4463. [2021-11-23 02:42:54,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4463 states, 3432 states have (on average 1.354020979020979) internal successors, (4647), 3460 states have internal predecessors, (4647), 652 states have call successors, (652), 378 states have call predecessors, (652), 378 states have return successors, (652), 625 states have call predecessors, (652), 652 states have call successors, (652) [2021-11-23 02:42:54,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4463 states to 4463 states and 5951 transitions. [2021-11-23 02:42:54,352 INFO L78 Accepts]: Start accepts. Automaton has 4463 states and 5951 transitions. Word has length 111 [2021-11-23 02:42:54,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:42:54,352 INFO L470 AbstractCegarLoop]: Abstraction has 4463 states and 5951 transitions. [2021-11-23 02:42:54,352 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.0) internal successors, (60), 6 states have internal predecessors, (60), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-11-23 02:42:54,353 INFO L276 IsEmpty]: Start isEmpty. Operand 4463 states and 5951 transitions. [2021-11-23 02:42:54,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 02:42:54,368 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:42:54,368 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:42:54,410 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:42:54,595 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:42:54,595 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:42:54,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:42:54,596 INFO L85 PathProgramCache]: Analyzing trace with hash 1341230879, now seen corresponding path program 1 times [2021-11-23 02:42:54,596 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:42:54,596 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1944429433] [2021-11-23 02:42:54,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:42:54,597 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:42:54,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:42:54,674 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 20 proven. 4 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-23 02:42:54,674 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:42:54,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1944429433] [2021-11-23 02:42:54,676 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1944429433] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:42:54,676 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1046617604] [2021-11-23 02:42:54,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:42:54,676 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:42:54,676 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:42:54,682 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:42:54,699 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:42:54,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:42:54,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 539 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:42:54,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:42:54,964 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 57 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 02:42:54,964 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:42:54,965 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1046617604] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:42:54,965 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:42:54,965 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-23 02:42:54,965 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384012164] [2021-11-23 02:42:54,966 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:42:54,966 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:42:54,966 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:42:54,967 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:42:54,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:42:54,967 INFO L87 Difference]: Start difference. First operand 4463 states and 5951 transitions. Second operand has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:42:55,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:42:55,339 INFO L93 Difference]: Finished difference Result 8514 states and 11449 transitions. [2021-11-23 02:42:55,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:42:55,340 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 113 [2021-11-23 02:42:55,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:42:55,381 INFO L225 Difference]: With dead ends: 8514 [2021-11-23 02:42:55,381 INFO L226 Difference]: Without dead ends: 5542 [2021-11-23 02:42:55,392 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:42:55,393 INFO L933 BasicCegarLoop]: 165 mSDtfsCounter, 65 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 271 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:42:55,394 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 271 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:42:55,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5542 states. [2021-11-23 02:42:55,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5542 to 4982. [2021-11-23 02:42:55,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4982 states, 3879 states have (on average 1.3642691415313226) internal successors, (5292), 3907 states have internal predecessors, (5292), 688 states have call successors, (688), 414 states have call predecessors, (688), 414 states have return successors, (688), 661 states have call predecessors, (688), 688 states have call successors, (688) [2021-11-23 02:42:55,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4982 states to 4982 states and 6668 transitions. [2021-11-23 02:42:55,810 INFO L78 Accepts]: Start accepts. Automaton has 4982 states and 6668 transitions. Word has length 113 [2021-11-23 02:42:55,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:42:55,810 INFO L470 AbstractCegarLoop]: Abstraction has 4982 states and 6668 transitions. [2021-11-23 02:42:55,812 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:42:55,812 INFO L276 IsEmpty]: Start isEmpty. Operand 4982 states and 6668 transitions. [2021-11-23 02:42:55,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 02:42:55,828 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:42:55,829 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:42:55,867 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:42:56,043 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-23 02:42:56,044 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:42:56,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:42:56,044 INFO L85 PathProgramCache]: Analyzing trace with hash 468430558, now seen corresponding path program 2 times [2021-11-23 02:42:56,044 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:42:56,044 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1226495090] [2021-11-23 02:42:56,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:42:56,045 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:42:56,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:42:56,112 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 10 proven. 25 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 02:42:56,113 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:42:56,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1226495090] [2021-11-23 02:42:56,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1226495090] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:42:56,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [142044057] [2021-11-23 02:42:56,113 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:42:56,114 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:42:56,114 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:42:56,115 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:42:56,135 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:42:56,238 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 02:42:56,238 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:42:56,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 489 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 02:42:56,245 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:42:56,666 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 23 proven. 23 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:42:56,666 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:42:57,050 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-23 02:42:57,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [142044057] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:42:57,051 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:42:57,051 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6, 7] total 14 [2021-11-23 02:42:57,051 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55121112] [2021-11-23 02:42:57,051 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:42:57,052 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:42:57,052 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:42:57,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:42:57,053 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2021-11-23 02:42:57,053 INFO L87 Difference]: Start difference. First operand 4982 states and 6668 transitions. Second operand has 4 states, 4 states have (on average 15.5) internal successors, (62), 4 states have internal predecessors, (62), 3 states have call successors, (9), 1 states have call predecessors, (9), 3 states have return successors, (10), 4 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:42:57,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:42:57,601 INFO L93 Difference]: Finished difference Result 9913 states and 13398 transitions. [2021-11-23 02:42:57,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:42:57,602 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.5) internal successors, (62), 4 states have internal predecessors, (62), 3 states have call successors, (9), 1 states have call predecessors, (9), 3 states have return successors, (10), 4 states have call predecessors, (10), 3 states have call successors, (10) Word has length 113 [2021-11-23 02:42:57,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:42:57,649 INFO L225 Difference]: With dead ends: 9913 [2021-11-23 02:42:57,650 INFO L226 Difference]: Without dead ends: 6422 [2021-11-23 02:42:57,663 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 220 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2021-11-23 02:42:57,664 INFO L933 BasicCegarLoop]: 140 mSDtfsCounter, 111 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 271 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:42:57,665 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [111 Valid, 271 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:42:57,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6422 states. [2021-11-23 02:42:58,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6422 to 6230. [2021-11-23 02:42:58,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6230 states, 5019 states have (on average 1.3460848774656307) internal successors, (6756), 5047 states have internal predecessors, (6756), 706 states have call successors, (706), 504 states have call predecessors, (706), 504 states have return successors, (754), 679 states have call predecessors, (754), 706 states have call successors, (754) [2021-11-23 02:42:58,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6230 states to 6230 states and 8216 transitions. [2021-11-23 02:42:58,156 INFO L78 Accepts]: Start accepts. Automaton has 6230 states and 8216 transitions. Word has length 113 [2021-11-23 02:42:58,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:42:58,156 INFO L470 AbstractCegarLoop]: Abstraction has 6230 states and 8216 transitions. [2021-11-23 02:42:58,156 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.5) internal successors, (62), 4 states have internal predecessors, (62), 3 states have call successors, (9), 1 states have call predecessors, (9), 3 states have return successors, (10), 4 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:42:58,157 INFO L276 IsEmpty]: Start isEmpty. Operand 6230 states and 8216 transitions. [2021-11-23 02:42:58,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 02:42:58,176 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:42:58,176 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:42:58,220 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 02:42:58,403 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-23 02:42:58,403 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:42:58,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:42:58,404 INFO L85 PathProgramCache]: Analyzing trace with hash -763677826, now seen corresponding path program 1 times [2021-11-23 02:42:58,404 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:42:58,404 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [514002262] [2021-11-23 02:42:58,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:42:58,405 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:42:58,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:42:58,487 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 02:42:58,487 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:42:58,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [514002262] [2021-11-23 02:42:58,487 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [514002262] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:42:58,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1770500347] [2021-11-23 02:42:58,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:42:58,488 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:42:58,488 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:42:58,489 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:42:58,511 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:42:58,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:42:58,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 536 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:42:58,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:42:58,787 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 62 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:42:58,787 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:42:58,787 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1770500347] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:42:58,788 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:42:58,788 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 02:42:58,788 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835577104] [2021-11-23 02:42:58,788 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:42:58,789 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:42:58,790 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:42:58,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:42:58,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:42:58,791 INFO L87 Difference]: Start difference. First operand 6230 states and 8216 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:42:59,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:42:59,255 INFO L93 Difference]: Finished difference Result 10440 states and 14070 transitions. [2021-11-23 02:42:59,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:42:59,255 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 113 [2021-11-23 02:42:59,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:42:59,309 INFO L225 Difference]: With dead ends: 10440 [2021-11-23 02:42:59,309 INFO L226 Difference]: Without dead ends: 6250 [2021-11-23 02:42:59,325 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:42:59,327 INFO L933 BasicCegarLoop]: 169 mSDtfsCounter, 88 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 262 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:42:59,327 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 262 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:42:59,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6250 states. [2021-11-23 02:42:59,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6250 to 6170. [2021-11-23 02:42:59,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6170 states, 4959 states have (on average 1.3139745916515426) internal successors, (6516), 4987 states have internal predecessors, (6516), 706 states have call successors, (706), 504 states have call predecessors, (706), 504 states have return successors, (754), 679 states have call predecessors, (754), 706 states have call successors, (754) [2021-11-23 02:42:59,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6170 states to 6170 states and 7976 transitions. [2021-11-23 02:42:59,830 INFO L78 Accepts]: Start accepts. Automaton has 6170 states and 7976 transitions. Word has length 113 [2021-11-23 02:42:59,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:42:59,831 INFO L470 AbstractCegarLoop]: Abstraction has 6170 states and 7976 transitions. [2021-11-23 02:42:59,831 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:42:59,831 INFO L276 IsEmpty]: Start isEmpty. Operand 6170 states and 7976 transitions. [2021-11-23 02:42:59,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 02:42:59,851 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:42:59,851 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:42:59,893 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:43:00,067 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-23 02:43:00,067 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:43:00,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:43:00,068 INFO L85 PathProgramCache]: Analyzing trace with hash -1128683810, now seen corresponding path program 1 times [2021-11-23 02:43:00,068 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:43:00,068 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1254540430] [2021-11-23 02:43:00,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:00,068 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:43:00,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:00,140 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 10 proven. 25 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 02:43:00,140 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:43:00,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1254540430] [2021-11-23 02:43:00,141 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1254540430] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:43:00,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1888026743] [2021-11-23 02:43:00,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:00,142 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:43:00,142 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:43:00,143 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:43:00,159 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 02:43:00,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:00,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 542 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:43:00,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:43:00,476 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:43:00,477 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:43:00,477 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1888026743] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:43:00,477 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:43:00,477 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 02:43:00,478 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392942159] [2021-11-23 02:43:00,478 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:43:00,478 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:43:00,479 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:43:00,479 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:43:00,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:43:00,480 INFO L87 Difference]: Start difference. First operand 6170 states and 7976 transitions. Second operand has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 3 states have internal predecessors, (76), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:43:01,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:43:01,005 INFO L93 Difference]: Finished difference Result 11251 states and 14618 transitions. [2021-11-23 02:43:01,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:43:01,006 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 3 states have internal predecessors, (76), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 113 [2021-11-23 02:43:01,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:43:01,040 INFO L225 Difference]: With dead ends: 11251 [2021-11-23 02:43:01,040 INFO L226 Difference]: Without dead ends: 7151 [2021-11-23 02:43:01,055 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:43:01,056 INFO L933 BasicCegarLoop]: 112 mSDtfsCounter, 99 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:43:01,057 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [99 Valid, 135 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:43:01,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7151 states. [2021-11-23 02:43:01,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7151 to 7151. [2021-11-23 02:43:01,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7151 states, 5826 states have (on average 1.2868177136972194) internal successors, (7497), 5854 states have internal predecessors, (7497), 736 states have call successors, (736), 588 states have call predecessors, (736), 588 states have return successors, (784), 709 states have call predecessors, (784), 736 states have call successors, (784) [2021-11-23 02:43:01,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7151 states to 7151 states and 9017 transitions. [2021-11-23 02:43:01,654 INFO L78 Accepts]: Start accepts. Automaton has 7151 states and 9017 transitions. Word has length 113 [2021-11-23 02:43:01,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:43:01,655 INFO L470 AbstractCegarLoop]: Abstraction has 7151 states and 9017 transitions. [2021-11-23 02:43:01,656 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 3 states have internal predecessors, (76), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:43:01,656 INFO L276 IsEmpty]: Start isEmpty. Operand 7151 states and 9017 transitions. [2021-11-23 02:43:01,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-23 02:43:01,676 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:43:01,677 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:43:01,721 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 02:43:01,892 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-23 02:43:01,893 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:43:01,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:43:01,893 INFO L85 PathProgramCache]: Analyzing trace with hash -918604943, now seen corresponding path program 1 times [2021-11-23 02:43:01,893 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:43:01,894 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1059015345] [2021-11-23 02:43:01,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:01,894 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:43:01,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:01,970 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 02:43:01,970 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:43:01,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1059015345] [2021-11-23 02:43:01,971 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1059015345] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:43:01,971 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2074866096] [2021-11-23 02:43:01,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:01,971 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:43:01,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:43:01,973 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:43:01,995 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 02:43:02,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:02,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 541 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:43:02,108 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:43:02,305 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:43:02,305 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:43:02,306 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2074866096] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:43:02,306 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:43:02,306 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 02:43:02,306 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1029418792] [2021-11-23 02:43:02,307 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:43:02,307 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:43:02,307 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:43:02,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:43:02,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:43:02,308 INFO L87 Difference]: Start difference. First operand 7151 states and 9017 transitions. Second operand has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:43:02,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:43:02,803 INFO L93 Difference]: Finished difference Result 12068 states and 15528 transitions. [2021-11-23 02:43:02,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:43:02,803 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 114 [2021-11-23 02:43:02,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:43:02,833 INFO L225 Difference]: With dead ends: 12068 [2021-11-23 02:43:02,833 INFO L226 Difference]: Without dead ends: 7099 [2021-11-23 02:43:02,848 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:43:02,849 INFO L933 BasicCegarLoop]: 182 mSDtfsCounter, 87 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 274 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:43:02,850 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 274 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:43:02,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7099 states. [2021-11-23 02:43:03,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7099 to 7043. [2021-11-23 02:43:03,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7043 states, 5730 states have (on average 1.2581151832460733) internal successors, (7209), 5746 states have internal predecessors, (7209), 736 states have call successors, (736), 588 states have call predecessors, (736), 576 states have return successors, (772), 709 states have call predecessors, (772), 736 states have call successors, (772) [2021-11-23 02:43:03,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7043 states to 7043 states and 8717 transitions. [2021-11-23 02:43:03,403 INFO L78 Accepts]: Start accepts. Automaton has 7043 states and 8717 transitions. Word has length 114 [2021-11-23 02:43:03,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:43:03,404 INFO L470 AbstractCegarLoop]: Abstraction has 7043 states and 8717 transitions. [2021-11-23 02:43:03,404 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:43:03,404 INFO L276 IsEmpty]: Start isEmpty. Operand 7043 states and 8717 transitions. [2021-11-23 02:43:03,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-23 02:43:03,423 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:43:03,423 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:43:03,467 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 02:43:03,651 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-23 02:43:03,651 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:43:03,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:43:03,652 INFO L85 PathProgramCache]: Analyzing trace with hash -1796748787, now seen corresponding path program 1 times [2021-11-23 02:43:03,652 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:43:03,652 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2193078] [2021-11-23 02:43:03,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:03,652 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:43:03,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:03,733 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-23 02:43:03,733 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:43:03,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2193078] [2021-11-23 02:43:03,734 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2193078] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:43:03,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2039723483] [2021-11-23 02:43:03,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:03,734 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:43:03,735 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:43:03,736 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:43:03,755 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 02:43:03,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:03,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 545 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:43:03,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:43:04,100 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 61 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 02:43:04,100 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:43:04,101 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2039723483] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:43:04,101 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:43:04,101 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-11-23 02:43:04,101 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202161308] [2021-11-23 02:43:04,101 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:43:04,102 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:43:04,103 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:43:04,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:43:04,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:43:04,104 INFO L87 Difference]: Start difference. First operand 7043 states and 8717 transitions. Second operand has 4 states, 4 states have (on average 21.5) internal successors, (86), 4 states have internal predecessors, (86), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-23 02:43:04,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:43:04,575 INFO L93 Difference]: Finished difference Result 10154 states and 12597 transitions. [2021-11-23 02:43:04,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:43:04,576 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 21.5) internal successors, (86), 4 states have internal predecessors, (86), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 116 [2021-11-23 02:43:04,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:43:04,605 INFO L225 Difference]: With dead ends: 10154 [2021-11-23 02:43:04,605 INFO L226 Difference]: Without dead ends: 7527 [2021-11-23 02:43:04,617 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:43:04,619 INFO L933 BasicCegarLoop]: 170 mSDtfsCounter, 104 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 424 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:43:04,620 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [104 Valid, 424 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:43:04,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7527 states. [2021-11-23 02:43:05,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7527 to 7303. [2021-11-23 02:43:05,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7303 states, 5940 states have (on average 1.2533670033670035) internal successors, (7445), 5974 states have internal predecessors, (7445), 744 states have call successors, (744), 594 states have call predecessors, (744), 618 states have return successors, (816), 735 states have call predecessors, (816), 744 states have call successors, (816) [2021-11-23 02:43:05,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7303 states to 7303 states and 9005 transitions. [2021-11-23 02:43:05,134 INFO L78 Accepts]: Start accepts. Automaton has 7303 states and 9005 transitions. Word has length 116 [2021-11-23 02:43:05,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:43:05,135 INFO L470 AbstractCegarLoop]: Abstraction has 7303 states and 9005 transitions. [2021-11-23 02:43:05,135 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 21.5) internal successors, (86), 4 states have internal predecessors, (86), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-23 02:43:05,135 INFO L276 IsEmpty]: Start isEmpty. Operand 7303 states and 9005 transitions. [2021-11-23 02:43:05,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-23 02:43:05,160 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:43:05,160 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:43:05,200 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 02:43:05,379 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-23 02:43:05,379 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:43:05,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:43:05,380 INFO L85 PathProgramCache]: Analyzing trace with hash 263649726, now seen corresponding path program 1 times [2021-11-23 02:43:05,380 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:43:05,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2108589001] [2021-11-23 02:43:05,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:05,381 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:43:05,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:05,457 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-23 02:43:05,457 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:43:05,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2108589001] [2021-11-23 02:43:05,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2108589001] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:43:05,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1026748454] [2021-11-23 02:43:05,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:05,458 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:43:05,458 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:43:05,459 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:43:05,480 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 02:43:05,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:05,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 544 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:43:05,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:43:05,777 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 56 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 02:43:05,777 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:43:05,778 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1026748454] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:43:05,778 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:43:05,778 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 02:43:05,779 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [71291570] [2021-11-23 02:43:05,779 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:43:05,780 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:43:05,780 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:43:05,780 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:43:05,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:43:05,781 INFO L87 Difference]: Start difference. First operand 7303 states and 9005 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:43:06,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:43:06,274 INFO L93 Difference]: Finished difference Result 9996 states and 12452 transitions. [2021-11-23 02:43:06,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:43:06,275 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), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 117 [2021-11-23 02:43:06,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:43:06,306 INFO L225 Difference]: With dead ends: 9996 [2021-11-23 02:43:06,306 INFO L226 Difference]: Without dead ends: 7045 [2021-11-23 02:43:06,320 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:43:06,321 INFO L933 BasicCegarLoop]: 115 mSDtfsCounter, 21 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 213 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:43:06,322 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 213 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:43:06,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7045 states. [2021-11-23 02:43:06,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7045 to 6625. [2021-11-23 02:43:06,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6625 states, 5370 states have (on average 1.2562383612662942) internal successors, (6746), 5377 states have internal predecessors, (6746), 708 states have call successors, (708), 558 states have call predecessors, (708), 546 states have return successors, (744), 690 states have call predecessors, (744), 708 states have call successors, (744) [2021-11-23 02:43:06,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6625 states to 6625 states and 8198 transitions. [2021-11-23 02:43:06,894 INFO L78 Accepts]: Start accepts. Automaton has 6625 states and 8198 transitions. Word has length 117 [2021-11-23 02:43:06,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:43:06,895 INFO L470 AbstractCegarLoop]: Abstraction has 6625 states and 8198 transitions. [2021-11-23 02:43:06,895 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), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:43:06,895 INFO L276 IsEmpty]: Start isEmpty. Operand 6625 states and 8198 transitions. [2021-11-23 02:43:06,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-23 02:43:06,921 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:43:06,921 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:43:06,959 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 02:43:07,143 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-23 02:43:07,143 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:43:07,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:43:07,144 INFO L85 PathProgramCache]: Analyzing trace with hash -584897462, now seen corresponding path program 1 times [2021-11-23 02:43:07,144 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:43:07,144 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [684321966] [2021-11-23 02:43:07,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:07,145 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:43:07,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:07,207 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-23 02:43:07,208 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:43:07,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [684321966] [2021-11-23 02:43:07,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [684321966] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:43:07,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1978098236] [2021-11-23 02:43:07,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:07,209 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:43:07,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:43:07,210 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:43:07,234 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 02:43:07,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:07,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 549 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:43:07,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:43:07,523 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 56 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 02:43:07,523 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:43:07,523 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1978098236] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:43:07,523 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:43:07,524 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 02:43:07,524 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202314953] [2021-11-23 02:43:07,524 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:43:07,525 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:43:07,525 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:43:07,526 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:43:07,526 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:43:07,527 INFO L87 Difference]: Start difference. First operand 6625 states and 8198 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:43:08,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:43:08,028 INFO L93 Difference]: Finished difference Result 15683 states and 19643 transitions. [2021-11-23 02:43:08,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:43:08,028 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 117 [2021-11-23 02:43:08,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:43:08,062 INFO L225 Difference]: With dead ends: 15683 [2021-11-23 02:43:08,062 INFO L226 Difference]: Without dead ends: 9120 [2021-11-23 02:43:08,078 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:43:08,079 INFO L933 BasicCegarLoop]: 124 mSDtfsCounter, 48 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 219 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:43:08,080 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 219 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:43:08,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9120 states. [2021-11-23 02:43:08,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9120 to 7317. [2021-11-23 02:43:08,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7317 states, 5964 states have (on average 1.266934942991281) internal successors, (7556), 5972 states have internal predecessors, (7556), 757 states have call successors, (757), 607 states have call predecessors, (757), 595 states have return successors, (793), 738 states have call predecessors, (793), 757 states have call successors, (793) [2021-11-23 02:43:08,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7317 states to 7317 states and 9106 transitions. [2021-11-23 02:43:08,579 INFO L78 Accepts]: Start accepts. Automaton has 7317 states and 9106 transitions. Word has length 117 [2021-11-23 02:43:08,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:43:08,580 INFO L470 AbstractCegarLoop]: Abstraction has 7317 states and 9106 transitions. [2021-11-23 02:43:08,580 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:43:08,580 INFO L276 IsEmpty]: Start isEmpty. Operand 7317 states and 9106 transitions. [2021-11-23 02:43:08,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-23 02:43:08,601 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:43:08,601 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:43:08,641 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 02:43:08,815 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:43:08,815 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:43:08,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:43:08,816 INFO L85 PathProgramCache]: Analyzing trace with hash 413587060, now seen corresponding path program 1 times [2021-11-23 02:43:08,816 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:43:08,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1066637182] [2021-11-23 02:43:08,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:08,816 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:43:08,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:08,899 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 41 proven. 17 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 02:43:08,899 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:43:08,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1066637182] [2021-11-23 02:43:08,900 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1066637182] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:43:08,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1262668668] [2021-11-23 02:43:08,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:08,900 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:43:08,901 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:43:08,902 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:43:08,921 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 02:43:09,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:09,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 02:43:09,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:43:09,252 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 77 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:43:09,252 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:43:09,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1262668668] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:43:09,253 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:43:09,253 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5] total 6 [2021-11-23 02:43:09,253 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609826631] [2021-11-23 02:43:09,253 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:43:09,254 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:43:09,254 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:43:09,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:43:09,255 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:43:09,255 INFO L87 Difference]: Start difference. First operand 7317 states and 9106 transitions. Second operand has 6 states, 6 states have (on average 16.0) internal successors, (96), 6 states have internal predecessors, (96), 5 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2021-11-23 02:43:10,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:43:10,040 INFO L93 Difference]: Finished difference Result 14378 states and 17965 transitions. [2021-11-23 02:43:10,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 02:43:10,041 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.0) internal successors, (96), 6 states have internal predecessors, (96), 5 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) Word has length 118 [2021-11-23 02:43:10,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:43:10,074 INFO L225 Difference]: With dead ends: 14378 [2021-11-23 02:43:10,075 INFO L226 Difference]: Without dead ends: 9372 [2021-11-23 02:43:10,087 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:43:10,087 INFO L933 BasicCegarLoop]: 169 mSDtfsCounter, 188 mSDsluCounter, 235 mSDsCounter, 0 mSdLazyCounter, 198 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 203 SdHoareTripleChecker+Valid, 368 SdHoareTripleChecker+Invalid, 251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:43:10,088 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [203 Valid, 368 Invalid, 251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 198 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:43:10,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9372 states. [2021-11-23 02:43:10,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9372 to 8837. [2021-11-23 02:43:10,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8837 states, 7184 states have (on average 1.257238307349666) internal successors, (9032), 7180 states have internal predecessors, (9032), 937 states have call successors, (937), 745 states have call predecessors, (937), 715 states have return successors, (991), 912 states have call predecessors, (991), 937 states have call successors, (991) [2021-11-23 02:43:10,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8837 states to 8837 states and 10960 transitions. [2021-11-23 02:43:10,692 INFO L78 Accepts]: Start accepts. Automaton has 8837 states and 10960 transitions. Word has length 118 [2021-11-23 02:43:10,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:43:10,693 INFO L470 AbstractCegarLoop]: Abstraction has 8837 states and 10960 transitions. [2021-11-23 02:43:10,693 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.0) internal successors, (96), 6 states have internal predecessors, (96), 5 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2021-11-23 02:43:10,693 INFO L276 IsEmpty]: Start isEmpty. Operand 8837 states and 10960 transitions. [2021-11-23 02:43:10,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 02:43:10,706 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:43:10,706 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:43:10,750 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 02:43:10,919 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-23 02:43:10,919 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:43:10,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:43:10,920 INFO L85 PathProgramCache]: Analyzing trace with hash -399675774, now seen corresponding path program 1 times [2021-11-23 02:43:10,920 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:43:10,920 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [169198034] [2021-11-23 02:43:10,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:10,920 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:43:10,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:10,972 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 24 proven. 1 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-23 02:43:10,973 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:43:10,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [169198034] [2021-11-23 02:43:10,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [169198034] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:43:10,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1784904099] [2021-11-23 02:43:10,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:10,974 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:43:10,974 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:43:10,975 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:43:10,995 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 02:43:11,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:11,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 538 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:43:11,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:43:11,281 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 60 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 02:43:11,281 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:43:11,281 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1784904099] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:43:11,282 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:43:11,282 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-23 02:43:11,282 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068888062] [2021-11-23 02:43:11,282 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:43:11,284 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:43:11,284 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:43:11,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:43:11,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:43:11,285 INFO L87 Difference]: Start difference. First operand 8837 states and 10960 transitions. Second operand has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:43:11,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:43:11,857 INFO L93 Difference]: Finished difference Result 16289 states and 20390 transitions. [2021-11-23 02:43:11,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:43:11,857 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 113 [2021-11-23 02:43:11,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:43:11,895 INFO L225 Difference]: With dead ends: 16289 [2021-11-23 02:43:11,896 INFO L226 Difference]: Without dead ends: 10643 [2021-11-23 02:43:11,907 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:43:11,908 INFO L933 BasicCegarLoop]: 157 mSDtfsCounter, 51 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 262 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:43:11,909 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 262 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:43:11,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10643 states. [2021-11-23 02:43:12,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10643 to 9689. [2021-11-23 02:43:12,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9689 states, 7908 states have (on average 1.2701062215477996) internal successors, (10044), 7904 states have internal predecessors, (10044), 1001 states have call successors, (1001), 809 states have call predecessors, (1001), 779 states have return successors, (1055), 976 states have call predecessors, (1055), 1001 states have call successors, (1055) [2021-11-23 02:43:12,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9689 states to 9689 states and 12100 transitions. [2021-11-23 02:43:12,601 INFO L78 Accepts]: Start accepts. Automaton has 9689 states and 12100 transitions. Word has length 113 [2021-11-23 02:43:12,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:43:12,601 INFO L470 AbstractCegarLoop]: Abstraction has 9689 states and 12100 transitions. [2021-11-23 02:43:12,602 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:43:12,602 INFO L276 IsEmpty]: Start isEmpty. Operand 9689 states and 12100 transitions. [2021-11-23 02:43:12,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 02:43:12,614 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:43:12,614 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:43:12,653 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2021-11-23 02:43:12,839 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:43:12,839 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:43:12,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:43:12,840 INFO L85 PathProgramCache]: Analyzing trace with hash -1461185143, now seen corresponding path program 1 times [2021-11-23 02:43:12,840 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:43:12,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1440501400] [2021-11-23 02:43:12,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:12,840 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:43:12,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:13,038 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 39 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-23 02:43:13,038 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:43:13,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1440501400] [2021-11-23 02:43:13,039 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1440501400] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:43:13,039 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:43:13,039 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-23 02:43:13,039 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730448857] [2021-11-23 02:43:13,039 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:43:13,040 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-23 02:43:13,040 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:43:13,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-23 02:43:13,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:43:13,041 INFO L87 Difference]: Start difference. First operand 9689 states and 12100 transitions. Second operand has 11 states, 7 states have (on average 9.857142857142858) internal successors, (69), 8 states have internal predecessors, (69), 6 states have call successors, (9), 3 states have call predecessors, (9), 4 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) [2021-11-23 02:43:14,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:43:14,760 INFO L93 Difference]: Finished difference Result 21685 states and 27606 transitions. [2021-11-23 02:43:14,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 02:43:14,760 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 7 states have (on average 9.857142857142858) internal successors, (69), 8 states have internal predecessors, (69), 6 states have call successors, (9), 3 states have call predecessors, (9), 4 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) Word has length 113 [2021-11-23 02:43:14,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:43:14,815 INFO L225 Difference]: With dead ends: 21685 [2021-11-23 02:43:14,815 INFO L226 Difference]: Without dead ends: 16784 [2021-11-23 02:43:14,834 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=186, Unknown=0, NotChecked=0, Total=272 [2021-11-23 02:43:14,835 INFO L933 BasicCegarLoop]: 119 mSDtfsCounter, 554 mSDsluCounter, 421 mSDsCounter, 0 mSdLazyCounter, 669 mSolverCounterSat, 223 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 568 SdHoareTripleChecker+Valid, 472 SdHoareTripleChecker+Invalid, 892 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 223 IncrementalHoareTripleChecker+Valid, 669 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:43:14,836 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [568 Valid, 472 Invalid, 892 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [223 Valid, 669 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:43:14,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16784 states. [2021-11-23 02:43:16,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16784 to 13786. [2021-11-23 02:43:16,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13786 states, 11345 states have (on average 1.25165271044513) internal successors, (14200), 11374 states have internal predecessors, (14200), 1331 states have call successors, (1331), 1106 states have call predecessors, (1331), 1109 states have return successors, (1439), 1306 states have call predecessors, (1439), 1331 states have call successors, (1439) [2021-11-23 02:43:16,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13786 states to 13786 states and 16970 transitions. [2021-11-23 02:43:16,149 INFO L78 Accepts]: Start accepts. Automaton has 13786 states and 16970 transitions. Word has length 113 [2021-11-23 02:43:16,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:43:16,150 INFO L470 AbstractCegarLoop]: Abstraction has 13786 states and 16970 transitions. [2021-11-23 02:43:16,151 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 7 states have (on average 9.857142857142858) internal successors, (69), 8 states have internal predecessors, (69), 6 states have call successors, (9), 3 states have call predecessors, (9), 4 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) [2021-11-23 02:43:16,151 INFO L276 IsEmpty]: Start isEmpty. Operand 13786 states and 16970 transitions. [2021-11-23 02:43:16,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 02:43:16,164 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:43:16,165 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:43:16,165 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-23 02:43:16,165 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:43:16,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:43:16,166 INFO L85 PathProgramCache]: Analyzing trace with hash 1062311178, now seen corresponding path program 1 times [2021-11-23 02:43:16,166 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:43:16,166 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1479049737] [2021-11-23 02:43:16,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:16,167 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:43:16,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:16,229 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 02:43:16,229 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:43:16,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1479049737] [2021-11-23 02:43:16,230 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1479049737] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:43:16,230 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:43:16,230 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:43:16,230 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757957716] [2021-11-23 02:43:16,230 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:43:16,231 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:43:16,231 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:43:16,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:43:16,232 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:43:16,232 INFO L87 Difference]: Start difference. First operand 13786 states and 16970 transitions. Second operand has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 3 states have call successors, (9), 1 states have call predecessors, (9), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:43:17,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:43:17,151 INFO L93 Difference]: Finished difference Result 19194 states and 23912 transitions. [2021-11-23 02:43:17,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:43:17,152 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 3 states have call successors, (9), 1 states have call predecessors, (9), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 113 [2021-11-23 02:43:17,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:43:17,196 INFO L225 Difference]: With dead ends: 19194 [2021-11-23 02:43:17,197 INFO L226 Difference]: Without dead ends: 13654 [2021-11-23 02:43:17,212 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:43:17,213 INFO L933 BasicCegarLoop]: 180 mSDtfsCounter, 201 mSDsluCounter, 155 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 201 SdHoareTripleChecker+Valid, 298 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:43:17,214 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [201 Valid, 298 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 152 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:43:17,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13654 states. [2021-11-23 02:43:18,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13654 to 13630. [2021-11-23 02:43:18,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13630 states, 11198 states have (on average 1.2407572780853724) internal successors, (13894), 11218 states have internal predecessors, (13894), 1331 states have call successors, (1331), 1106 states have call predecessors, (1331), 1100 states have return successors, (1430), 1306 states have call predecessors, (1430), 1331 states have call successors, (1430) [2021-11-23 02:43:18,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13630 states to 13630 states and 16655 transitions. [2021-11-23 02:43:18,358 INFO L78 Accepts]: Start accepts. Automaton has 13630 states and 16655 transitions. Word has length 113 [2021-11-23 02:43:18,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:43:18,359 INFO L470 AbstractCegarLoop]: Abstraction has 13630 states and 16655 transitions. [2021-11-23 02:43:18,359 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 3 states have call successors, (9), 1 states have call predecessors, (9), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:43:18,360 INFO L276 IsEmpty]: Start isEmpty. Operand 13630 states and 16655 transitions. [2021-11-23 02:43:18,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-23 02:43:18,372 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:43:18,373 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:43:18,373 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-11-23 02:43:18,373 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:43:18,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:43:18,374 INFO L85 PathProgramCache]: Analyzing trace with hash 163584257, now seen corresponding path program 1 times [2021-11-23 02:43:18,374 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:43:18,374 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [325921368] [2021-11-23 02:43:18,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:18,375 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:43:18,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:18,440 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:43:18,440 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:43:18,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [325921368] [2021-11-23 02:43:18,440 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [325921368] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:43:18,441 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:43:18,441 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:43:18,441 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [711839979] [2021-11-23 02:43:18,441 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:43:18,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:43:18,442 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:43:18,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:43:18,442 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:43:18,443 INFO L87 Difference]: Start difference. First operand 13630 states and 16655 transitions. Second operand has 5 states, 5 states have (on average 15.0) internal successors, (75), 5 states have internal predecessors, (75), 3 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:43:19,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:43:19,575 INFO L93 Difference]: Finished difference Result 22966 states and 28070 transitions. [2021-11-23 02:43:19,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:43:19,577 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 15.0) internal successors, (75), 5 states have internal predecessors, (75), 3 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 114 [2021-11-23 02:43:19,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:43:19,621 INFO L225 Difference]: With dead ends: 22966 [2021-11-23 02:43:19,621 INFO L226 Difference]: Without dead ends: 17582 [2021-11-23 02:43:19,631 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:43:19,632 INFO L933 BasicCegarLoop]: 160 mSDtfsCounter, 103 mSDsluCounter, 210 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 335 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:43:19,633 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 335 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 187 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:43:19,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17582 states. [2021-11-23 02:43:20,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17582 to 17049. [2021-11-23 02:43:20,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17049 states, 13907 states have (on average 1.2295966060257424) internal successors, (17100), 13969 states have internal predecessors, (17100), 1725 states have call successors, (1725), 1416 states have call predecessors, (1725), 1416 states have return successors, (1932), 1664 states have call predecessors, (1932), 1725 states have call successors, (1932) [2021-11-23 02:43:20,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17049 states to 17049 states and 20757 transitions. [2021-11-23 02:43:20,900 INFO L78 Accepts]: Start accepts. Automaton has 17049 states and 20757 transitions. Word has length 114 [2021-11-23 02:43:20,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:43:20,901 INFO L470 AbstractCegarLoop]: Abstraction has 17049 states and 20757 transitions. [2021-11-23 02:43:20,902 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 15.0) internal successors, (75), 5 states have internal predecessors, (75), 3 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 02:43:20,902 INFO L276 IsEmpty]: Start isEmpty. Operand 17049 states and 20757 transitions. [2021-11-23 02:43:20,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-11-23 02:43:20,920 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:43:20,921 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:43:20,921 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-11-23 02:43:20,921 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:43:20,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:43:20,922 INFO L85 PathProgramCache]: Analyzing trace with hash 134362487, now seen corresponding path program 1 times [2021-11-23 02:43:20,922 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:43:20,922 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1113552658] [2021-11-23 02:43:20,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:20,923 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:43:20,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:21,059 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 13 proven. 37 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 02:43:21,060 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:43:21,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1113552658] [2021-11-23 02:43:21,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1113552658] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:43:21,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1726642360] [2021-11-23 02:43:21,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:43:21,061 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:43:21,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:43:21,075 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:43:21,076 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 02:43:21,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:43:21,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 602 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 02:43:21,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:43:21,538 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 62 proven. 14 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:43:21,539 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:43:22,034 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 17 proven. 3 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2021-11-23 02:43:22,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1726642360] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:43:22,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1446537326] [2021-11-23 02:43:22,058 INFO L159 IcfgInterpreter]: Started Sifa with 67 locations of interest [2021-11-23 02:43:22,058 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:43:22,063 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:43:22,069 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:43:22,070 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:43:29,990 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 124 for LOIs [2021-11-23 02:43:39,855 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 167 for LOIs [2021-11-23 02:43:45,205 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 135 for LOIs [2021-11-23 02:43:45,234 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 92 for LOIs [2021-11-23 02:43:45,261 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 48 for LOIs [2021-11-23 02:43:45,404 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 68 for LOIs [2021-11-23 02:43:45,773 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:43:57,288 WARN L227 SmtUtils]: Spent 10.53s on a formula simplification. DAG size of input: 452 DAG size of output: 406 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:44:07,206 WARN L227 SmtUtils]: Spent 6.45s on a formula simplification. DAG size of input: 470 DAG size of output: 321 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:44:12,350 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '481967#(and (<= ~local~0 2147483647) (<= |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 2147483647) (= ~t1_pc~0 0) (= ~t1_i~0 1) (<= 0 (+ ~local~0 2147483648)) (= |ULTIMATE.start_start_simulation_~kernel_st~0#1| 1) (<= |ULTIMATE.start_eval_~tmp~0#1| 1) (= 0 ~t3_pc~0) (<= 0 (+ |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 2147483648)) (not (= |ULTIMATE.start_eval_~tmp~0#1| 0)) (= ~m_pc~0 1) (= ~m_i~0 1) (not (= ~token~0 (+ 3 ~local~0))) (= ~t2_i~0 1) (= 0 ~t2_pc~0) (not (= |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 0)) (= ~m_st~0 1) (= |#NULL.offset| 0) (<= ~token~0 2147483647) (= ~t3_i~0 1) (<= 0 (+ ~token~0 2147483648)) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_eval_~tmp~0#1|) (= |#NULL.base| 0))' at error location [2021-11-23 02:44:12,350 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:44:12,350 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:44:12,350 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8, 6] total 19 [2021-11-23 02:44:12,351 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85434466] [2021-11-23 02:44:12,351 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:44:12,351 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-23 02:44:12,351 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:44:12,352 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-23 02:44:12,354 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=533, Invalid=4023, Unknown=0, NotChecked=0, Total=4556 [2021-11-23 02:44:12,354 INFO L87 Difference]: Start difference. First operand 17049 states and 20757 transitions. Second operand has 19 states, 15 states have (on average 9.6) internal successors, (144), 17 states have internal predecessors, (144), 9 states have call successors, (33), 5 states have call predecessors, (33), 8 states have return successors, (34), 9 states have call predecessors, (34), 9 states have call successors, (34) [2021-11-23 02:44:17,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:44:17,517 INFO L93 Difference]: Finished difference Result 34157 states and 42738 transitions. [2021-11-23 02:44:17,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2021-11-23 02:44:17,519 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 15 states have (on average 9.6) internal successors, (144), 17 states have internal predecessors, (144), 9 states have call successors, (33), 5 states have call predecessors, (33), 8 states have return successors, (34), 9 states have call predecessors, (34), 9 states have call successors, (34) Word has length 119 [2021-11-23 02:44:17,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:44:17,560 INFO L225 Difference]: With dead ends: 34157 [2021-11-23 02:44:17,560 INFO L226 Difference]: Without dead ends: 17070 [2021-11-23 02:44:17,607 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 346 SyntacticMatches, 10 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11374 ImplicationChecksByTransitivity, 28.6s TimeCoverageRelationStatistics Valid=2165, Invalid=24241, Unknown=0, NotChecked=0, Total=26406 [2021-11-23 02:44:17,607 INFO L933 BasicCegarLoop]: 354 mSDtfsCounter, 1714 mSDsluCounter, 3367 mSDsCounter, 0 mSdLazyCounter, 3151 mSolverCounterSat, 663 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1720 SdHoareTripleChecker+Valid, 3234 SdHoareTripleChecker+Invalid, 3814 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 663 IncrementalHoareTripleChecker+Valid, 3151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:44:17,607 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1720 Valid, 3234 Invalid, 3814 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [663 Valid, 3151 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2021-11-23 02:44:17,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17070 states. [2021-11-23 02:44:18,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17070 to 10676. [2021-11-23 02:44:18,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10676 states, 8750 states have (on average 1.2326857142857144) internal successors, (10786), 8781 states have internal predecessors, (10786), 1024 states have call successors, (1024), 901 states have call predecessors, (1024), 901 states have return successors, (1093), 993 states have call predecessors, (1093), 1024 states have call successors, (1093) [2021-11-23 02:44:18,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10676 states to 10676 states and 12903 transitions. [2021-11-23 02:44:18,644 INFO L78 Accepts]: Start accepts. Automaton has 10676 states and 12903 transitions. Word has length 119 [2021-11-23 02:44:18,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:44:18,644 INFO L470 AbstractCegarLoop]: Abstraction has 10676 states and 12903 transitions. [2021-11-23 02:44:18,645 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 15 states have (on average 9.6) internal successors, (144), 17 states have internal predecessors, (144), 9 states have call successors, (33), 5 states have call predecessors, (33), 8 states have return successors, (34), 9 states have call predecessors, (34), 9 states have call successors, (34) [2021-11-23 02:44:18,645 INFO L276 IsEmpty]: Start isEmpty. Operand 10676 states and 12903 transitions. [2021-11-23 02:44:18,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-11-23 02:44:18,654 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:44:18,655 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:44:18,694 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-23 02:44:18,871 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:44:18,872 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:44:18,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:44:18,872 INFO L85 PathProgramCache]: Analyzing trace with hash 795512980, now seen corresponding path program 1 times [2021-11-23 02:44:18,872 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:44:18,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [725253346] [2021-11-23 02:44:18,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:44:18,873 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:44:18,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:44:19,045 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 13 proven. 37 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 02:44:19,046 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:44:19,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [725253346] [2021-11-23 02:44:19,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [725253346] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:44:19,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1779115051] [2021-11-23 02:44:19,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:44:19,047 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:44:19,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:44:19,052 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:44:19,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 02:44:19,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:44:19,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 611 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 02:44:19,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:44:19,566 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 62 proven. 14 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:44:19,566 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:44:20,013 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 17 proven. 3 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2021-11-23 02:44:20,014 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1779115051] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:44:20,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [805722171] [2021-11-23 02:44:20,018 INFO L159 IcfgInterpreter]: Started Sifa with 70 locations of interest [2021-11-23 02:44:20,018 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:44:20,019 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:44:20,019 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:44:20,020 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:44:25,086 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 124 for LOIs [2021-11-23 02:44:37,169 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 167 for LOIs [2021-11-23 02:44:42,187 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 135 for LOIs [2021-11-23 02:44:42,217 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 60 for LOIs [2021-11-23 02:44:42,233 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 48 for LOIs [2021-11-23 02:44:42,306 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 68 for LOIs [2021-11-23 02:44:42,627 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:44:55,323 WARN L227 SmtUtils]: Spent 11.80s on a formula simplification. DAG size of input: 506 DAG size of output: 460 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:45:09,215 WARN L227 SmtUtils]: Spent 10.34s on a formula simplification. DAG size of input: 616 DAG size of output: 413 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:45:16,208 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '544603#(and (<= ~t1_pc~0 1) (<= ~local~0 2147483647) (<= |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 2147483647) (= ~t1_i~0 1) (<= 0 (+ ~local~0 2147483648)) (= |ULTIMATE.start_start_simulation_~kernel_st~0#1| 1) (<= |ULTIMATE.start_eval_~tmp~0#1| 1) (= 0 ~t3_pc~0) (<= 0 (+ |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 2147483648)) (= ~m_pc~0 1) (= ~m_i~0 1) (not (= ~token~0 (+ 3 ~local~0))) (= ~t2_i~0 1) (= 0 ~t2_pc~0) (= ~m_st~0 1) (= |#NULL.offset| 0) (<= ~token~0 2147483647) (= ~t3_i~0 1) (<= 0 (+ ~token~0 2147483648)) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_eval_~tmp~0#1|) (<= 0 ~t1_pc~0) (= |#NULL.base| 0))' at error location [2021-11-23 02:45:16,208 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:45:16,208 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:45:16,208 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9, 6] total 21 [2021-11-23 02:45:16,209 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1844936187] [2021-11-23 02:45:16,209 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:45:16,209 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-23 02:45:16,210 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:45:16,210 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-23 02:45:16,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=499, Invalid=4471, Unknown=0, NotChecked=0, Total=4970 [2021-11-23 02:45:16,212 INFO L87 Difference]: Start difference. First operand 10676 states and 12903 transitions. Second operand has 21 states, 17 states have (on average 9.0) internal successors, (153), 19 states have internal predecessors, (153), 9 states have call successors, (33), 5 states have call predecessors, (33), 8 states have return successors, (34), 9 states have call predecessors, (34), 9 states have call successors, (34) [2021-11-23 02:45:21,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:45:21,907 INFO L93 Difference]: Finished difference Result 28525 states and 36729 transitions. [2021-11-23 02:45:21,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2021-11-23 02:45:21,920 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 17 states have (on average 9.0) internal successors, (153), 19 states have internal predecessors, (153), 9 states have call successors, (33), 5 states have call predecessors, (33), 8 states have return successors, (34), 9 states have call predecessors, (34), 9 states have call successors, (34) Word has length 122 [2021-11-23 02:45:21,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:45:21,959 INFO L225 Difference]: With dead ends: 28525 [2021-11-23 02:45:21,959 INFO L226 Difference]: Without dead ends: 18704 [2021-11-23 02:45:21,992 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 547 GetRequests, 363 SyntacticMatches, 4 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14093 ImplicationChecksByTransitivity, 36.1s TimeCoverageRelationStatistics Valid=2510, Invalid=30432, Unknown=0, NotChecked=0, Total=32942 [2021-11-23 02:45:21,993 INFO L933 BasicCegarLoop]: 371 mSDtfsCounter, 1205 mSDsluCounter, 3217 mSDsCounter, 0 mSdLazyCounter, 2975 mSolverCounterSat, 609 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1215 SdHoareTripleChecker+Valid, 3160 SdHoareTripleChecker+Invalid, 3584 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 609 IncrementalHoareTripleChecker+Valid, 2975 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:45:21,993 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1215 Valid, 3160 Invalid, 3584 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [609 Valid, 2975 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2021-11-23 02:45:22,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18704 states. [2021-11-23 02:45:22,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18704 to 7490. [2021-11-23 02:45:22,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7490 states, 6222 states have (on average 1.2457409193185471) internal successors, (7751), 6233 states have internal predecessors, (7751), 656 states have call successors, (656), 615 states have call predecessors, (656), 611 states have return successors, (679), 641 states have call predecessors, (679), 656 states have call successors, (679) [2021-11-23 02:45:22,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7490 states to 7490 states and 9086 transitions. [2021-11-23 02:45:22,787 INFO L78 Accepts]: Start accepts. Automaton has 7490 states and 9086 transitions. Word has length 122 [2021-11-23 02:45:22,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:45:22,788 INFO L470 AbstractCegarLoop]: Abstraction has 7490 states and 9086 transitions. [2021-11-23 02:45:22,788 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 17 states have (on average 9.0) internal successors, (153), 19 states have internal predecessors, (153), 9 states have call successors, (33), 5 states have call predecessors, (33), 8 states have return successors, (34), 9 states have call predecessors, (34), 9 states have call successors, (34) [2021-11-23 02:45:22,788 INFO L276 IsEmpty]: Start isEmpty. Operand 7490 states and 9086 transitions. [2021-11-23 02:45:22,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-23 02:45:22,795 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:45:22,795 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:45:22,833 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2021-11-23 02:45:23,009 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:45:23,010 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:45:23,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:45:23,010 INFO L85 PathProgramCache]: Analyzing trace with hash 356584013, now seen corresponding path program 1 times [2021-11-23 02:45:23,010 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:45:23,011 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [202260745] [2021-11-23 02:45:23,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:45:23,011 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:45:23,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:45:23,093 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 17 proven. 14 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-23 02:45:23,093 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:45:23,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [202260745] [2021-11-23 02:45:23,093 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [202260745] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:45:23,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1444718309] [2021-11-23 02:45:23,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:45:23,094 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:45:23,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:45:23,095 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:45:23,121 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-23 02:45:23,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:45:23,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 621 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 02:45:23,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:45:23,546 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 60 proven. 14 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:45:23,546 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:45:24,032 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 17 proven. 3 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-23 02:45:24,032 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1444718309] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:45:24,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1626615650] [2021-11-23 02:45:24,036 INFO L159 IcfgInterpreter]: Started Sifa with 73 locations of interest [2021-11-23 02:45:24,037 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:45:24,037 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:45:24,038 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:45:24,038 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:45:28,919 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 124 for LOIs [2021-11-23 02:45:31,335 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 167 for LOIs [2021-11-23 02:45:31,942 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 135 for LOIs [2021-11-23 02:45:31,976 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 60 for LOIs [2021-11-23 02:45:31,993 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 50 for LOIs [2021-11-23 02:45:32,094 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 68 for LOIs [2021-11-23 02:45:32,331 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:45:44,832 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '595004#(and (<= ~t1_pc~0 1) (<= ~local~0 2147483647) (<= |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 2147483647) (= ~t1_i~0 1) (<= 0 (+ ~local~0 2147483648)) (<= 0 ~t2_pc~0) (= |ULTIMATE.start_start_simulation_~kernel_st~0#1| 1) (<= |ULTIMATE.start_eval_~tmp~0#1| 1) (= 0 ~t3_pc~0) (<= 0 (+ |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 2147483648)) (not (= |ULTIMATE.start_eval_~tmp~0#1| 0)) (= ~m_pc~0 1) (<= ~t2_pc~0 1) (= ~m_i~0 1) (not (= ~token~0 (+ 3 ~local~0))) (= ~t2_i~0 1) (not (= |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 0)) (= ~m_st~0 1) (= |#NULL.offset| 0) (<= ~token~0 2147483647) (= ~t3_i~0 1) (<= 0 (+ ~token~0 2147483648)) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_eval_~tmp~0#1|) (<= 0 ~t1_pc~0) (= |#NULL.base| 0))' at error location [2021-11-23 02:45:44,832 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:45:44,832 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:45:44,832 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10, 6] total 17 [2021-11-23 02:45:44,833 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [30025088] [2021-11-23 02:45:44,833 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:45:44,833 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-23 02:45:44,833 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:45:44,834 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-23 02:45:44,834 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=522, Invalid=4734, Unknown=0, NotChecked=0, Total=5256 [2021-11-23 02:45:44,835 INFO L87 Difference]: Start difference. First operand 7490 states and 9086 transitions. Second operand has 17 states, 14 states have (on average 9.142857142857142) internal successors, (128), 15 states have internal predecessors, (128), 6 states have call successors, (30), 4 states have call predecessors, (30), 7 states have return successors, (30), 5 states have call predecessors, (30), 6 states have call successors, (30) [2021-11-23 02:45:53,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:45:53,620 INFO L93 Difference]: Finished difference Result 23240 states and 29867 transitions. [2021-11-23 02:45:53,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 215 states. [2021-11-23 02:45:53,621 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 14 states have (on average 9.142857142857142) internal successors, (128), 15 states have internal predecessors, (128), 6 states have call successors, (30), 4 states have call predecessors, (30), 7 states have return successors, (30), 5 states have call predecessors, (30), 6 states have call successors, (30) Word has length 124 [2021-11-23 02:45:53,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:45:53,664 INFO L225 Difference]: With dead ends: 23240 [2021-11-23 02:45:53,664 INFO L226 Difference]: Without dead ends: 16314 [2021-11-23 02:45:53,686 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 678 GetRequests, 401 SyntacticMatches, 5 SemanticMatches, 272 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32747 ImplicationChecksByTransitivity, 17.7s TimeCoverageRelationStatistics Valid=6351, Invalid=68451, Unknown=0, NotChecked=0, Total=74802 [2021-11-23 02:45:53,687 INFO L933 BasicCegarLoop]: 614 mSDtfsCounter, 1327 mSDsluCounter, 4263 mSDsCounter, 0 mSdLazyCounter, 3738 mSolverCounterSat, 764 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1337 SdHoareTripleChecker+Valid, 4342 SdHoareTripleChecker+Invalid, 4502 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 764 IncrementalHoareTripleChecker+Valid, 3738 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:45:53,688 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1337 Valid, 4342 Invalid, 4502 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [764 Valid, 3738 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:45:53,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16314 states. [2021-11-23 02:45:54,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16314 to 9244. [2021-11-23 02:45:54,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9244 states, 7664 states have (on average 1.2175104384133613) internal successors, (9331), 7683 states have internal predecessors, (9331), 808 states have call successors, (808), 764 states have call predecessors, (808), 771 states have return successors, (989), 796 states have call predecessors, (989), 808 states have call successors, (989) [2021-11-23 02:45:54,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9244 states to 9244 states and 11128 transitions. [2021-11-23 02:45:54,462 INFO L78 Accepts]: Start accepts. Automaton has 9244 states and 11128 transitions. Word has length 124 [2021-11-23 02:45:54,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:45:54,463 INFO L470 AbstractCegarLoop]: Abstraction has 9244 states and 11128 transitions. [2021-11-23 02:45:54,463 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 14 states have (on average 9.142857142857142) internal successors, (128), 15 states have internal predecessors, (128), 6 states have call successors, (30), 4 states have call predecessors, (30), 7 states have return successors, (30), 5 states have call predecessors, (30), 6 states have call successors, (30) [2021-11-23 02:45:54,463 INFO L276 IsEmpty]: Start isEmpty. Operand 9244 states and 11128 transitions. [2021-11-23 02:45:54,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-23 02:45:54,472 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:45:54,472 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:45:54,514 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-23 02:45:54,699 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-23 02:45:54,699 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:45:54,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:45:54,700 INFO L85 PathProgramCache]: Analyzing trace with hash 1199577155, now seen corresponding path program 1 times [2021-11-23 02:45:54,700 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:45:54,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [625665455] [2021-11-23 02:45:54,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:45:54,700 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:45:54,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:45:55,004 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 28 proven. 20 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 02:45:55,004 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:45:55,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [625665455] [2021-11-23 02:45:55,004 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [625665455] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:45:55,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [45697917] [2021-11-23 02:45:55,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:45:55,005 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:45:55,005 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:45:55,006 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:45:55,007 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-23 02:45:55,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:45:55,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 631 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 02:45:55,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:45:55,598 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 56 proven. 2 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:45:55,598 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:45:56,521 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 27 proven. 7 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-23 02:45:56,522 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [45697917] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:45:56,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [922611831] [2021-11-23 02:45:56,525 INFO L159 IcfgInterpreter]: Started Sifa with 76 locations of interest [2021-11-23 02:45:56,526 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:45:56,526 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:45:56,527 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:45:56,527 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:46:03,238 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 60 for LOIs [2021-11-23 02:46:03,260 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 85 for LOIs [2021-11-23 02:46:03,286 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 85 for LOIs [2021-11-23 02:46:03,299 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 39 for LOIs [2021-11-23 02:46:03,309 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 63 for LOIs [2021-11-23 02:46:03,398 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 60 for LOIs [2021-11-23 02:46:03,675 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:46:18,204 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '640246#(and (<= ~t1_pc~0 1) (<= ~local~0 2147483647) (<= |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 2147483647) (= ~t1_i~0 1) (<= 0 (+ ~local~0 2147483648)) (<= 0 ~t2_pc~0) (= |ULTIMATE.start_start_simulation_~kernel_st~0#1| 1) (<= |ULTIMATE.start_eval_~tmp~0#1| 1) (<= 0 (+ |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 2147483648)) (not (= |ULTIMATE.start_eval_~tmp~0#1| 0)) (= ~m_pc~0 1) (<= ~t2_pc~0 1) (= ~m_i~0 1) (not (= ~token~0 (+ 3 ~local~0))) (<= ~t3_pc~0 1) (= ~t2_i~0 1) (not (= |ULTIMATE.start_eval_~tmp_ndt_1~0#1| 0)) (= ~m_st~0 1) (= |#NULL.offset| 0) (<= ~token~0 2147483647) (<= 0 ~t3_pc~0) (= ~t3_i~0 1) (<= 0 (+ ~token~0 2147483648)) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_eval_~tmp~0#1|) (<= 0 ~t1_pc~0) (= |#NULL.base| 0))' at error location [2021-11-23 02:46:18,204 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:46:18,205 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:46:18,205 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 9, 12] total 36 [2021-11-23 02:46:18,205 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527451373] [2021-11-23 02:46:18,205 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:46:18,206 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-23 02:46:18,206 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:18,206 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-23 02:46:18,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=657, Invalid=8273, Unknown=0, NotChecked=0, Total=8930 [2021-11-23 02:46:18,207 INFO L87 Difference]: Start difference. First operand 9244 states and 11128 transitions. Second operand has 36 states, 24 states have (on average 8.041666666666666) internal successors, (193), 27 states have internal predecessors, (193), 14 states have call successors, (40), 11 states have call predecessors, (40), 18 states have return successors, (40), 14 states have call predecessors, (40), 14 states have call successors, (40) [2021-11-23 02:46:25,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:25,759 INFO L93 Difference]: Finished difference Result 20863 states and 25374 transitions. [2021-11-23 02:46:25,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-11-23 02:46:25,760 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 24 states have (on average 8.041666666666666) internal successors, (193), 27 states have internal predecessors, (193), 14 states have call successors, (40), 11 states have call predecessors, (40), 18 states have return successors, (40), 14 states have call predecessors, (40), 14 states have call successors, (40) Word has length 126 [2021-11-23 02:46:25,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:25,787 INFO L225 Difference]: With dead ends: 20863 [2021-11-23 02:46:25,787 INFO L226 Difference]: Without dead ends: 14006 [2021-11-23 02:46:25,803 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 305 SyntacticMatches, 18 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10934 ImplicationChecksByTransitivity, 18.1s TimeCoverageRelationStatistics Valid=2575, Invalid=23185, Unknown=0, NotChecked=0, Total=25760 [2021-11-23 02:46:25,803 INFO L933 BasicCegarLoop]: 164 mSDtfsCounter, 5456 mSDsluCounter, 1307 mSDsCounter, 0 mSdLazyCounter, 3973 mSolverCounterSat, 2519 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5456 SdHoareTripleChecker+Valid, 1254 SdHoareTripleChecker+Invalid, 6492 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2519 IncrementalHoareTripleChecker+Valid, 3973 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:46:25,804 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5456 Valid, 1254 Invalid, 6492 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2519 Valid, 3973 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2021-11-23 02:46:25,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14006 states. [2021-11-23 02:46:26,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14006 to 9044. [2021-11-23 02:46:26,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9044 states, 7465 states have (on average 1.2179504353650368) internal successors, (9092), 7489 states have internal predecessors, (9092), 811 states have call successors, (811), 755 states have call predecessors, (811), 767 states have return successors, (943), 799 states have call predecessors, (943), 811 states have call successors, (943) [2021-11-23 02:46:26,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9044 states to 9044 states and 10846 transitions. [2021-11-23 02:46:26,721 INFO L78 Accepts]: Start accepts. Automaton has 9044 states and 10846 transitions. Word has length 126 [2021-11-23 02:46:26,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:26,721 INFO L470 AbstractCegarLoop]: Abstraction has 9044 states and 10846 transitions. [2021-11-23 02:46:26,722 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 24 states have (on average 8.041666666666666) internal successors, (193), 27 states have internal predecessors, (193), 14 states have call successors, (40), 11 states have call predecessors, (40), 18 states have return successors, (40), 14 states have call predecessors, (40), 14 states have call successors, (40) [2021-11-23 02:46:26,722 INFO L276 IsEmpty]: Start isEmpty. Operand 9044 states and 10846 transitions. [2021-11-23 02:46:26,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 02:46:26,726 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:26,726 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:46:26,751 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-23 02:46:26,926 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:46:26,927 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:26,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:26,927 INFO L85 PathProgramCache]: Analyzing trace with hash -1181254839, now seen corresponding path program 1 times [2021-11-23 02:46:26,927 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:26,927 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [12936958] [2021-11-23 02:46:26,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:26,928 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:26,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:27,008 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 31 proven. 19 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2021-11-23 02:46:27,009 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:27,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [12936958] [2021-11-23 02:46:27,009 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [12936958] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:46:27,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [698525485] [2021-11-23 02:46:27,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:27,010 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:46:27,010 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:46:27,011 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:46:27,020 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 02:46:27,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:27,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 660 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:46:27,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:46:27,342 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 83 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 02:46:27,343 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:46:27,343 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [698525485] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:27,343 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:46:27,343 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 6 [2021-11-23 02:46:27,343 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1269958250] [2021-11-23 02:46:27,343 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:27,344 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:46:27,344 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:27,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:46:27,344 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:46:27,344 INFO L87 Difference]: Start difference. First operand 9044 states and 10846 transitions. Second operand has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:46:28,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:28,074 INFO L93 Difference]: Finished difference Result 17869 states and 21508 transitions. [2021-11-23 02:46:28,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:46:28,076 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 140 [2021-11-23 02:46:28,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:28,092 INFO L225 Difference]: With dead ends: 17869 [2021-11-23 02:46:28,092 INFO L226 Difference]: Without dead ends: 9521 [2021-11-23 02:46:28,103 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:46:28,104 INFO L933 BasicCegarLoop]: 121 mSDtfsCounter, 78 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:46:28,104 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [78 Valid, 150 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:46:28,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9521 states. [2021-11-23 02:46:28,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9521 to 9308. [2021-11-23 02:46:28,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9308 states, 7713 states have (on average 1.2044600025930248) internal successors, (9290), 7737 states have internal predecessors, (9290), 811 states have call successors, (811), 771 states have call predecessors, (811), 783 states have return successors, (955), 799 states have call predecessors, (955), 811 states have call successors, (955) [2021-11-23 02:46:28,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9308 states to 9308 states and 11056 transitions. [2021-11-23 02:46:28,900 INFO L78 Accepts]: Start accepts. Automaton has 9308 states and 11056 transitions. Word has length 140 [2021-11-23 02:46:28,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:28,901 INFO L470 AbstractCegarLoop]: Abstraction has 9308 states and 11056 transitions. [2021-11-23 02:46:28,901 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:46:28,901 INFO L276 IsEmpty]: Start isEmpty. Operand 9308 states and 11056 transitions. [2021-11-23 02:46:28,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-11-23 02:46:28,907 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:28,907 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:46:28,949 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-23 02:46:29,123 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-23 02:46:29,123 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:29,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:29,124 INFO L85 PathProgramCache]: Analyzing trace with hash -601103667, now seen corresponding path program 1 times [2021-11-23 02:46:29,124 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:29,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1457208454] [2021-11-23 02:46:29,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:29,124 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:29,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:29,178 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 42 proven. 8 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2021-11-23 02:46:29,179 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:29,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1457208454] [2021-11-23 02:46:29,179 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1457208454] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:46:29,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [927883306] [2021-11-23 02:46:29,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:29,180 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:46:29,180 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:46:29,181 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:46:29,198 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-23 02:46:29,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:29,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 653 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:46:29,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:46:29,580 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 109 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 02:46:29,580 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:46:29,581 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [927883306] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:29,581 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:46:29,581 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 4 [2021-11-23 02:46:29,581 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [962551725] [2021-11-23 02:46:29,581 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:29,581 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:46:29,582 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:29,582 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:46:29,582 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:46:29,582 INFO L87 Difference]: Start difference. First operand 9308 states and 11056 transitions. Second operand has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-23 02:46:30,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:30,063 INFO L93 Difference]: Finished difference Result 14042 states and 16863 transitions. [2021-11-23 02:46:30,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:46:30,063 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) Word has length 141 [2021-11-23 02:46:30,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:30,072 INFO L225 Difference]: With dead ends: 14042 [2021-11-23 02:46:30,072 INFO L226 Difference]: Without dead ends: 5449 [2021-11-23 02:46:30,083 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:46:30,083 INFO L933 BasicCegarLoop]: 153 mSDtfsCounter, 64 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 215 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:46:30,084 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 215 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:46:30,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5449 states. [2021-11-23 02:46:30,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5449 to 5316. [2021-11-23 02:46:30,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5316 states, 4397 states have (on average 1.1660222879235842) internal successors, (5127), 4408 states have internal predecessors, (5127), 469 states have call successors, (469), 449 states have call predecessors, (469), 449 states have return successors, (481), 458 states have call predecessors, (481), 469 states have call successors, (481) [2021-11-23 02:46:30,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5316 states to 5316 states and 6077 transitions. [2021-11-23 02:46:30,625 INFO L78 Accepts]: Start accepts. Automaton has 5316 states and 6077 transitions. Word has length 141 [2021-11-23 02:46:30,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:30,626 INFO L470 AbstractCegarLoop]: Abstraction has 5316 states and 6077 transitions. [2021-11-23 02:46:30,626 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-23 02:46:30,626 INFO L276 IsEmpty]: Start isEmpty. Operand 5316 states and 6077 transitions. [2021-11-23 02:46:30,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-23 02:46:30,630 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:30,631 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:46:30,656 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-23 02:46:30,839 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-23 02:46:30,839 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:30,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:30,840 INFO L85 PathProgramCache]: Analyzing trace with hash 1817421069, now seen corresponding path program 2 times [2021-11-23 02:46:30,840 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:30,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [767452799] [2021-11-23 02:46:30,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:30,840 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:30,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:30,934 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 43 proven. 36 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-11-23 02:46:30,934 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:30,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [767452799] [2021-11-23 02:46:30,935 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [767452799] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:46:30,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [196868967] [2021-11-23 02:46:30,935 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:46:30,935 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:46:30,936 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:46:30,953 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:46:30,956 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-23 02:46:31,085 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-23 02:46:31,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:46:31,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 657 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 02:46:31,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:46:31,299 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 111 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 02:46:31,300 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:46:31,300 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [196868967] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:31,300 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:46:31,300 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5] total 6 [2021-11-23 02:46:31,300 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [948638423] [2021-11-23 02:46:31,300 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:31,301 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:46:31,301 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:31,301 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:46:31,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:46:31,301 INFO L87 Difference]: Start difference. First operand 5316 states and 6077 transitions. Second operand has 6 states, 6 states have (on average 17.333333333333332) internal successors, (104), 6 states have internal predecessors, (104), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2021-11-23 02:46:32,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:32,011 INFO L93 Difference]: Finished difference Result 11076 states and 12731 transitions. [2021-11-23 02:46:32,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 02:46:32,012 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 17.333333333333332) internal successors, (104), 6 states have internal predecessors, (104), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) Word has length 143 [2021-11-23 02:46:32,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:32,023 INFO L225 Difference]: With dead ends: 11076 [2021-11-23 02:46:32,023 INFO L226 Difference]: Without dead ends: 6585 [2021-11-23 02:46:32,029 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:46:32,030 INFO L933 BasicCegarLoop]: 154 mSDtfsCounter, 210 mSDsluCounter, 216 mSDsCounter, 0 mSdLazyCounter, 193 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 225 SdHoareTripleChecker+Valid, 336 SdHoareTripleChecker+Invalid, 255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 193 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:46:32,030 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [225 Valid, 336 Invalid, 255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 193 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:46:32,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6585 states. [2021-11-23 02:46:32,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6585 to 6045. [2021-11-23 02:46:32,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6045 states, 4946 states have (on average 1.1522442377678932) internal successors, (5699), 4965 states have internal predecessors, (5699), 563 states have call successors, (563), 523 states have call predecessors, (563), 535 states have return successors, (625), 556 states have call predecessors, (625), 563 states have call successors, (625) [2021-11-23 02:46:32,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6045 states to 6045 states and 6887 transitions. [2021-11-23 02:46:32,551 INFO L78 Accepts]: Start accepts. Automaton has 6045 states and 6887 transitions. Word has length 143 [2021-11-23 02:46:32,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:32,551 INFO L470 AbstractCegarLoop]: Abstraction has 6045 states and 6887 transitions. [2021-11-23 02:46:32,551 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 17.333333333333332) internal successors, (104), 6 states have internal predecessors, (104), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2021-11-23 02:46:32,552 INFO L276 IsEmpty]: Start isEmpty. Operand 6045 states and 6887 transitions. [2021-11-23 02:46:32,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2021-11-23 02:46:32,555 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:32,555 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:46:32,578 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-23 02:46:32,755 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-23 02:46:32,756 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:32,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:32,756 INFO L85 PathProgramCache]: Analyzing trace with hash 1857649564, now seen corresponding path program 1 times [2021-11-23 02:46:32,756 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:32,757 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1355747248] [2021-11-23 02:46:32,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:32,757 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:32,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:32,874 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 175 trivial. 0 not checked. [2021-11-23 02:46:32,874 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:32,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1355747248] [2021-11-23 02:46:32,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1355747248] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:46:32,875 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:46:32,875 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:46:32,875 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1112371595] [2021-11-23 02:46:32,875 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:46:32,877 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:46:32,877 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:46:32,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:46:32,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:46:32,878 INFO L87 Difference]: Start difference. First operand 6045 states and 6887 transitions. Second operand has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 6 states have internal predecessors, (82), 5 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2021-11-23 02:46:34,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:46:34,965 INFO L93 Difference]: Finished difference Result 19295 states and 22108 transitions. [2021-11-23 02:46:34,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:46:34,965 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 6 states have internal predecessors, (82), 5 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) Word has length 172 [2021-11-23 02:46:34,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:46:34,992 INFO L225 Difference]: With dead ends: 19295 [2021-11-23 02:46:34,992 INFO L226 Difference]: Without dead ends: 16728 [2021-11-23 02:46:34,997 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:46:34,998 INFO L933 BasicCegarLoop]: 351 mSDtfsCounter, 368 mSDsluCounter, 941 mSDsCounter, 0 mSdLazyCounter, 615 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 368 SdHoareTripleChecker+Valid, 1121 SdHoareTripleChecker+Invalid, 625 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 615 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:46:34,998 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [368 Valid, 1121 Invalid, 625 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 615 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:46:35,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16728 states. [2021-11-23 02:46:35,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16728 to 10471. [2021-11-23 02:46:35,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10471 states, 8510 states have (on average 1.1486486486486487) internal successors, (9775), 8540 states have internal predecessors, (9775), 1018 states have call successors, (1018), 923 states have call predecessors, (1018), 942 states have return successors, (1136), 1007 states have call predecessors, (1136), 1018 states have call successors, (1136) [2021-11-23 02:46:36,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10471 states to 10471 states and 11929 transitions. [2021-11-23 02:46:36,015 INFO L78 Accepts]: Start accepts. Automaton has 10471 states and 11929 transitions. Word has length 172 [2021-11-23 02:46:36,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:46:36,016 INFO L470 AbstractCegarLoop]: Abstraction has 10471 states and 11929 transitions. [2021-11-23 02:46:36,016 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 6 states have internal predecessors, (82), 5 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2021-11-23 02:46:36,016 INFO L276 IsEmpty]: Start isEmpty. Operand 10471 states and 11929 transitions. [2021-11-23 02:46:36,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2021-11-23 02:46:36,023 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:46:36,023 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:46:36,023 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-11-23 02:46:36,023 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:46:36,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:46:36,024 INFO L85 PathProgramCache]: Analyzing trace with hash 1774534810, now seen corresponding path program 1 times [2021-11-23 02:46:36,024 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:46:36,024 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1110291064] [2021-11-23 02:46:36,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:36,025 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:46:36,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:36,357 INFO L134 CoverageAnalysis]: Checked inductivity of 224 backedges. 43 proven. 52 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2021-11-23 02:46:36,357 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:46:36,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1110291064] [2021-11-23 02:46:36,357 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1110291064] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:46:36,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [902979770] [2021-11-23 02:46:36,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:46:36,358 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:46:36,358 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:46:36,360 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:46:36,361 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_542e6637-911d-4a51-adb3-7c00553f520e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-23 02:46:36,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:46:36,541 INFO L263 TraceCheckSpWp]: Trace formula consists of 863 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-23 02:46:36,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:46:36,933 INFO L134 CoverageAnalysis]: Checked inductivity of 224 backedges. 137 proven. 2 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2021-11-23 02:46:36,933 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:46:37,654 INFO L134 CoverageAnalysis]: Checked inductivity of 224 backedges. 49 proven. 18 refuted. 0 times theorem prover too weak. 157 trivial. 0 not checked. [2021-11-23 02:46:37,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [902979770] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:46:37,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [976721992] [2021-11-23 02:46:37,658 INFO L159 IcfgInterpreter]: Started Sifa with 82 locations of interest [2021-11-23 02:46:37,658 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:46:37,659 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:46:37,659 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:46:37,659 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs