./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label43+token_ring.13.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label43+token_ring.13.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash e409b9fe4cf385d3ba251b64c82a83b23d76f184ce08a1cc7bc20e4c4b1f5571 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:49:46,375 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:49:46,378 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:49:46,449 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:49:46,450 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:49:46,456 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:49:46,458 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:49:46,463 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:49:46,466 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:49:46,476 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:49:46,478 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:49:46,480 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:49:46,481 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:49:46,484 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:49:46,487 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:49:46,499 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:49:46,500 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:49:46,501 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:49:46,504 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:49:46,507 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:49:46,509 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:49:46,511 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:49:46,513 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:49:46,514 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:49:46,519 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:49:46,519 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:49:46,520 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:49:46,521 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:49:46,522 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:49:46,524 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:49:46,524 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:49:46,525 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:49:46,526 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:49:46,528 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:49:46,529 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:49:46,530 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:49:46,531 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:49:46,531 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:49:46,532 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:49:46,533 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:49:46,534 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:49:46,535 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 23:49:46,568 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:49:46,568 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:49:46,569 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:49:46,569 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:49:46,570 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:49:46,570 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:49:46,570 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:49:46,571 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:49:46,571 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:49:46,571 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:49:46,571 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:49:46,572 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:49:46,572 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:49:46,572 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:49:46,573 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:49:46,573 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:49:46,573 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:49:46,573 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:49:46,574 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:49:46,575 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:49:46,575 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:49:46,575 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:49:46,575 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:49:46,576 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:49:46,576 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:49:46,576 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:49:46,576 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:49:46,577 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:49:46,577 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:49:46,577 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:49:46,577 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:49:46,578 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:49:46,578 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:49:46,578 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:49:46,579 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:49:46,579 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:49:46,579 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:49:46,579 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:49:46,580 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:49:46,580 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:49:46,580 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:49:46,580 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_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e409b9fe4cf385d3ba251b64c82a83b23d76f184ce08a1cc7bc20e4c4b1f5571 [2021-11-20 23:49:46,955 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:49:46,984 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:49:46,987 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:49:46,988 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:49:46,989 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:49:46,990 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/combinations/Problem05_label43+token_ring.13.cil-2.c [2021-11-20 23:49:47,073 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/data/61e7c41db/3e81fd27527d4408b0e6ddad580b0d45/FLAG56fb348be [2021-11-20 23:49:48,230 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:49:48,232 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/sv-benchmarks/c/combinations/Problem05_label43+token_ring.13.cil-2.c [2021-11-20 23:49:48,295 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/data/61e7c41db/3e81fd27527d4408b0e6ddad580b0d45/FLAG56fb348be [2021-11-20 23:49:48,429 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/data/61e7c41db/3e81fd27527d4408b0e6ddad580b0d45 [2021-11-20 23:49:48,433 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:49:48,436 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:49:48,438 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:49:48,438 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:49:48,442 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:49:48,443 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:49:48" (1/1) ... [2021-11-20 23:49:48,445 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1d1304fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:48, skipping insertion in model container [2021-11-20 23:49:48,445 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:49:48" (1/1) ... [2021-11-20 23:49:48,452 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:49:48,728 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:49:51,206 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_a3f36de0-44bd-470e-a85c-cb4257105cd9/sv-benchmarks/c/combinations/Problem05_label43+token_ring.13.cil-2.c[381679,381692] [2021-11-20 23:49:51,231 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_a3f36de0-44bd-470e-a85c-cb4257105cd9/sv-benchmarks/c/combinations/Problem05_label43+token_ring.13.cil-2.c[383339,383352] [2021-11-20 23:49:51,592 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:49:51,602 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:49:52,826 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_a3f36de0-44bd-470e-a85c-cb4257105cd9/sv-benchmarks/c/combinations/Problem05_label43+token_ring.13.cil-2.c[381679,381692] [2021-11-20 23:49:52,830 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_a3f36de0-44bd-470e-a85c-cb4257105cd9/sv-benchmarks/c/combinations/Problem05_label43+token_ring.13.cil-2.c[383339,383352] [2021-11-20 23:49:52,886 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:49:52,960 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:49:52,961 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:52 WrapperNode [2021-11-20 23:49:52,961 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:49:52,962 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:49:52,962 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:49:52,962 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:49:52,969 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:52" (1/1) ... [2021-11-20 23:49:53,086 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:52" (1/1) ... [2021-11-20 23:49:53,643 INFO L137 Inliner]: procedures = 70, calls = 80, calls flagged for inlining = 48, calls inlined = 48, statements flattened = 13257 [2021-11-20 23:49:53,644 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:49:53,645 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:49:53,645 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:49:53,645 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:49:53,655 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:52" (1/1) ... [2021-11-20 23:49:53,655 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:52" (1/1) ... [2021-11-20 23:49:53,799 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:52" (1/1) ... [2021-11-20 23:49:53,799 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:52" (1/1) ... [2021-11-20 23:49:54,065 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:52" (1/1) ... [2021-11-20 23:49:54,126 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:52" (1/1) ... [2021-11-20 23:49:54,150 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:52" (1/1) ... [2021-11-20 23:49:54,400 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:49:54,401 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:49:54,401 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:49:54,401 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:49:54,402 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:52" (1/1) ... [2021-11-20 23:49:54,409 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:49:54,420 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:49:54,438 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:49:54,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:49:54,541 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:49:54,541 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-20 23:49:54,541 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-20 23:49:54,542 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-20 23:49:54,542 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-20 23:49:54,542 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-20 23:49:54,542 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-20 23:49:54,542 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-20 23:49:54,542 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-20 23:49:54,543 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-20 23:49:54,543 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-20 23:49:54,543 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-20 23:49:54,543 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-20 23:49:54,543 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:49:54,543 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:49:54,544 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:49:54,730 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:49:54,731 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:50:02,241 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:50:04,632 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:50:04,632 INFO L301 CfgBuilder]: Removed 17 assume(true) statements. [2021-11-20 23:50:04,637 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:50:04 BoogieIcfgContainer [2021-11-20 23:50:04,638 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:50:04,640 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:50:04,640 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:50:04,643 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:50:04,643 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:49:48" (1/3) ... [2021-11-20 23:50:04,644 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31db1f9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:50:04, skipping insertion in model container [2021-11-20 23:50:04,644 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:52" (2/3) ... [2021-11-20 23:50:04,645 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31db1f9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:50:04, skipping insertion in model container [2021-11-20 23:50:04,645 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:50:04" (3/3) ... [2021-11-20 23:50:04,646 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem05_label43+token_ring.13.cil-2.c [2021-11-20 23:50:04,651 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:50:04,651 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-20 23:50:04,725 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:50:04,734 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 [2021-11-20 23:50:04,734 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-20 23:50:04,796 INFO L276 IsEmpty]: Start isEmpty. Operand has 1842 states, 1806 states have (on average 1.9540420819490587) internal successors, (3529), 1809 states have internal predecessors, (3529), 27 states have call successors, (27), 6 states have call predecessors, (27), 6 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) [2021-11-20 23:50:04,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-20 23:50:04,808 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:04,810 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:50:04,811 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:04,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:04,817 INFO L85 PathProgramCache]: Analyzing trace with hash -1029859456, now seen corresponding path program 1 times [2021-11-20 23:50:04,826 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:04,827 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1558664253] [2021-11-20 23:50:04,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:04,828 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:04,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:05,267 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:50:05,268 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:05,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1558664253] [2021-11-20 23:50:05,269 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1558664253] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:50:05,269 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:50:05,269 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:50:05,271 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514035671] [2021-11-20 23:50:05,272 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:50:05,276 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:50:05,288 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:05,327 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:50:05,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:50:05,336 INFO L87 Difference]: Start difference. First operand has 1842 states, 1806 states have (on average 1.9540420819490587) internal successors, (3529), 1809 states have internal predecessors, (3529), 27 states have call successors, (27), 6 states have call predecessors, (27), 6 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) Second operand has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 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) [2021-11-20 23:50:06,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:06,398 INFO L93 Difference]: Finished difference Result 3866 states and 7483 transitions. [2021-11-20 23:50:06,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:50:06,400 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 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 70 [2021-11-20 23:50:06,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:06,425 INFO L225 Difference]: With dead ends: 3866 [2021-11-20 23:50:06,425 INFO L226 Difference]: Without dead ends: 2023 [2021-11-20 23:50:06,434 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 [2021-11-20 23:50:06,438 INFO L933 BasicCegarLoop]: 3541 mSDtfsCounter, 3812 mSDsluCounter, 3753 mSDsCounter, 0 mSdLazyCounter, 742 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3812 SdHoareTripleChecker+Valid, 6980 SdHoareTripleChecker+Invalid, 756 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 742 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 23:50:06,439 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3812 Valid, 6980 Invalid, 756 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 742 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 23:50:06,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2023 states. [2021-11-20 23:50:06,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2023 to 2022. [2021-11-20 23:50:06,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2022 states, 1958 states have (on average 1.916241062308478) internal successors, (3752), 1961 states have internal predecessors, (3752), 50 states have call successors, (50), 12 states have call predecessors, (50), 12 states have return successors, (50), 49 states have call predecessors, (50), 50 states have call successors, (50) [2021-11-20 23:50:06,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2022 states to 2022 states and 3852 transitions. [2021-11-20 23:50:06,579 INFO L78 Accepts]: Start accepts. Automaton has 2022 states and 3852 transitions. Word has length 70 [2021-11-20 23:50:06,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:06,580 INFO L470 AbstractCegarLoop]: Abstraction has 2022 states and 3852 transitions. [2021-11-20 23:50:06,580 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 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) [2021-11-20 23:50:06,581 INFO L276 IsEmpty]: Start isEmpty. Operand 2022 states and 3852 transitions. [2021-11-20 23:50:06,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-20 23:50:06,592 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:06,593 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-20 23:50:06,593 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:50:06,593 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:06,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:06,594 INFO L85 PathProgramCache]: Analyzing trace with hash -1019021321, now seen corresponding path program 1 times [2021-11-20 23:50:06,594 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:06,594 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1869931394] [2021-11-20 23:50:06,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:06,595 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:06,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:06,804 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-20 23:50:06,804 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:06,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1869931394] [2021-11-20 23:50:06,805 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1869931394] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:50:06,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1289172205] [2021-11-20 23:50:06,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:06,806 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:06,806 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:50:06,808 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:50:06,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:50:07,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:07,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 1116 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 23:50:07,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:50:07,401 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-20 23:50:07,401 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:50:07,402 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1289172205] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:50:07,402 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:50:07,402 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-20 23:50:07,403 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88839709] [2021-11-20 23:50:07,404 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:50:07,405 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:50:07,405 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:07,405 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:50:07,406 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:50:07,406 INFO L87 Difference]: Start difference. First operand 2022 states and 3852 transitions. Second operand has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 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) [2021-11-20 23:50:07,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:07,973 INFO L93 Difference]: Finished difference Result 2767 states and 5025 transitions. [2021-11-20 23:50:07,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:50:07,974 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 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 143 [2021-11-20 23:50:07,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:07,994 INFO L225 Difference]: With dead ends: 2767 [2021-11-20 23:50:07,994 INFO L226 Difference]: Without dead ends: 2391 [2021-11-20 23:50:07,997 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:50:07,999 INFO L933 BasicCegarLoop]: 3360 mSDtfsCounter, 3525 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3525 SdHoareTripleChecker+Valid, 3600 SdHoareTripleChecker+Invalid, 324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:50:08,000 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3525 Valid, 3600 Invalid, 324 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:50:08,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2391 states. [2021-11-20 23:50:08,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2391 to 2387. [2021-11-20 23:50:08,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2387 states, 2267 states have (on average 1.8619320688134098) internal successors, (4221), 2271 states have internal predecessors, (4221), 94 states have call successors, (94), 24 states have call predecessors, (94), 24 states have return successors, (94), 92 states have call predecessors, (94), 94 states have call successors, (94) [2021-11-20 23:50:08,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2387 states to 2387 states and 4409 transitions. [2021-11-20 23:50:08,107 INFO L78 Accepts]: Start accepts. Automaton has 2387 states and 4409 transitions. Word has length 143 [2021-11-20 23:50:08,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:08,108 INFO L470 AbstractCegarLoop]: Abstraction has 2387 states and 4409 transitions. [2021-11-20 23:50:08,108 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 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) [2021-11-20 23:50:08,108 INFO L276 IsEmpty]: Start isEmpty. Operand 2387 states and 4409 transitions. [2021-11-20 23:50:08,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-20 23:50:08,115 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:08,116 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-20 23:50:08,157 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 23:50:08,340 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:08,341 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:08,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:08,342 INFO L85 PathProgramCache]: Analyzing trace with hash -1605039111, now seen corresponding path program 1 times [2021-11-20 23:50:08,342 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:08,342 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [229102335] [2021-11-20 23:50:08,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:08,342 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:08,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:08,503 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-20 23:50:08,503 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:08,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [229102335] [2021-11-20 23:50:08,508 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [229102335] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:50:08,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [635711777] [2021-11-20 23:50:08,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:08,509 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:08,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:50:08,513 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:50:08,536 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:50:08,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:08,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 1110 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 23:50:08,782 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:50:09,064 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-20 23:50:09,065 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:50:09,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [635711777] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:50:09,065 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:50:09,065 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-20 23:50:09,066 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422014390] [2021-11-20 23:50:09,066 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:50:09,068 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:50:09,069 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:09,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:50:09,069 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:50:09,070 INFO L87 Difference]: Start difference. First operand 2387 states and 4409 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 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) [2021-11-20 23:50:09,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:09,609 INFO L93 Difference]: Finished difference Result 3856 states and 6716 transitions. [2021-11-20 23:50:09,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:50:09,610 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 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 143 [2021-11-20 23:50:09,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:09,637 INFO L225 Difference]: With dead ends: 3856 [2021-11-20 23:50:09,637 INFO L226 Difference]: Without dead ends: 3115 [2021-11-20 23:50:09,644 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:50:09,648 INFO L933 BasicCegarLoop]: 3348 mSDtfsCounter, 3537 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3537 SdHoareTripleChecker+Valid, 3588 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:50:09,649 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3537 Valid, 3588 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:50:09,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3115 states. [2021-11-20 23:50:09,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3115 to 3109. [2021-11-20 23:50:09,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3109 states, 2879 states have (on average 1.7877735324765545) internal successors, (5147), 2885 states have internal predecessors, (5147), 180 states have call successors, (180), 48 states have call predecessors, (180), 48 states have return successors, (180), 176 states have call predecessors, (180), 180 states have call successors, (180) [2021-11-20 23:50:09,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3109 states to 3109 states and 5507 transitions. [2021-11-20 23:50:09,828 INFO L78 Accepts]: Start accepts. Automaton has 3109 states and 5507 transitions. Word has length 143 [2021-11-20 23:50:09,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:09,829 INFO L470 AbstractCegarLoop]: Abstraction has 3109 states and 5507 transitions. [2021-11-20 23:50:09,829 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 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) [2021-11-20 23:50:09,830 INFO L276 IsEmpty]: Start isEmpty. Operand 3109 states and 5507 transitions. [2021-11-20 23:50:09,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-20 23:50:09,838 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:09,838 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-20 23:50:09,876 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 23:50:10,052 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-11-20 23:50:10,053 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:10,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:10,053 INFO L85 PathProgramCache]: Analyzing trace with hash -1947259653, now seen corresponding path program 1 times [2021-11-20 23:50:10,054 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:10,054 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1042787898] [2021-11-20 23:50:10,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:10,054 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:10,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:10,143 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-20 23:50:10,143 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:10,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1042787898] [2021-11-20 23:50:10,146 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1042787898] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:50:10,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1160994392] [2021-11-20 23:50:10,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:10,151 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:10,151 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:50:10,157 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:50:10,175 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:50:10,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:10,500 INFO L263 TraceCheckSpWp]: Trace formula consists of 1104 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 23:50:10,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:50:10,774 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-20 23:50:10,775 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:50:10,775 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1160994392] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:50:10,775 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:50:10,776 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-20 23:50:10,776 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [625057044] [2021-11-20 23:50:10,776 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:50:10,777 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:50:10,777 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:10,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:50:10,778 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:50:10,778 INFO L87 Difference]: Start difference. First operand 3109 states and 5507 transitions. Second operand has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 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) [2021-11-20 23:50:11,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:11,343 INFO L93 Difference]: Finished difference Result 6010 states and 10048 transitions. [2021-11-20 23:50:11,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:50:11,344 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 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 143 [2021-11-20 23:50:11,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:11,376 INFO L225 Difference]: With dead ends: 6010 [2021-11-20 23:50:11,376 INFO L226 Difference]: Without dead ends: 4547 [2021-11-20 23:50:11,384 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:50:11,385 INFO L933 BasicCegarLoop]: 3326 mSDtfsCounter, 3519 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3519 SdHoareTripleChecker+Valid, 3566 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:50:11,385 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3519 Valid, 3566 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:50:11,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4547 states. [2021-11-20 23:50:11,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4547 to 4537. [2021-11-20 23:50:11,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4537 states, 4091 states have (on average 1.7049621119530678) internal successors, (6975), 4101 states have internal predecessors, (6975), 348 states have call successors, (348), 96 states have call predecessors, (348), 96 states have return successors, (348), 340 states have call predecessors, (348), 348 states have call successors, (348) [2021-11-20 23:50:11,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4537 states to 4537 states and 7671 transitions. [2021-11-20 23:50:11,591 INFO L78 Accepts]: Start accepts. Automaton has 4537 states and 7671 transitions. Word has length 143 [2021-11-20 23:50:11,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:11,591 INFO L470 AbstractCegarLoop]: Abstraction has 4537 states and 7671 transitions. [2021-11-20 23:50:11,592 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 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) [2021-11-20 23:50:11,592 INFO L276 IsEmpty]: Start isEmpty. Operand 4537 states and 7671 transitions. [2021-11-20 23:50:11,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-20 23:50:11,602 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:11,602 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-20 23:50:11,641 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 23:50:11,816 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:11,817 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:11,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:11,817 INFO L85 PathProgramCache]: Analyzing trace with hash -719787395, now seen corresponding path program 1 times [2021-11-20 23:50:11,817 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:11,817 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [275206016] [2021-11-20 23:50:11,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:11,818 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:11,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:11,921 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-20 23:50:11,921 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:11,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [275206016] [2021-11-20 23:50:11,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [275206016] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:50:11,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1877080506] [2021-11-20 23:50:11,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:11,922 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:11,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:50:11,923 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:50:11,950 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:50:12,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:12,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 1098 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 23:50:12,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:50:12,445 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-20 23:50:12,446 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:50:12,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1877080506] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:50:12,446 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:50:12,446 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-20 23:50:12,447 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325166127] [2021-11-20 23:50:12,447 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:50:12,447 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:50:12,448 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:12,448 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:50:12,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:50:12,448 INFO L87 Difference]: Start difference. First operand 4537 states and 7671 transitions. Second operand has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 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) [2021-11-20 23:50:13,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:13,108 INFO L93 Difference]: Finished difference Result 10270 states and 16612 transitions. [2021-11-20 23:50:13,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:50:13,109 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 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 143 [2021-11-20 23:50:13,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:13,170 INFO L225 Difference]: With dead ends: 10270 [2021-11-20 23:50:13,170 INFO L226 Difference]: Without dead ends: 7379 [2021-11-20 23:50:13,186 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:50:13,186 INFO L933 BasicCegarLoop]: 3346 mSDtfsCounter, 3543 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3543 SdHoareTripleChecker+Valid, 3586 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:50:13,187 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3543 Valid, 3586 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:50:13,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7379 states. [2021-11-20 23:50:13,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7379 to 7361. [2021-11-20 23:50:13,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7361 states, 6491 states have (on average 1.6304113387767678) internal successors, (10583), 6509 states have internal predecessors, (10583), 676 states have call successors, (676), 192 states have call predecessors, (676), 192 states have return successors, (676), 660 states have call predecessors, (676), 676 states have call successors, (676) [2021-11-20 23:50:13,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7361 states to 7361 states and 11935 transitions. [2021-11-20 23:50:13,544 INFO L78 Accepts]: Start accepts. Automaton has 7361 states and 11935 transitions. Word has length 143 [2021-11-20 23:50:13,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:13,545 INFO L470 AbstractCegarLoop]: Abstraction has 7361 states and 11935 transitions. [2021-11-20 23:50:13,547 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 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) [2021-11-20 23:50:13,547 INFO L276 IsEmpty]: Start isEmpty. Operand 7361 states and 11935 transitions. [2021-11-20 23:50:13,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-20 23:50:13,565 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:13,565 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-20 23:50:13,604 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 23:50:13,780 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:13,781 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:13,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:13,781 INFO L85 PathProgramCache]: Analyzing trace with hash 1017299455, now seen corresponding path program 1 times [2021-11-20 23:50:13,781 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:13,781 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [522939164] [2021-11-20 23:50:13,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:13,782 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:13,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:13,946 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-20 23:50:13,947 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:13,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [522939164] [2021-11-20 23:50:13,947 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [522939164] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:50:13,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2073958511] [2021-11-20 23:50:13,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:13,948 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:13,948 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:50:13,985 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:50:13,988 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 23:50:14,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:14,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 1092 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 23:50:14,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:50:14,483 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-20 23:50:14,483 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:50:14,483 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2073958511] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:50:14,483 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:50:14,484 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-20 23:50:14,484 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103724640] [2021-11-20 23:50:14,484 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:50:14,485 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:50:14,485 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:14,485 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:50:14,486 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:50:14,486 INFO L87 Difference]: Start difference. First operand 7361 states and 11935 transitions. Second operand has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 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) [2021-11-20 23:50:15,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:15,554 INFO L93 Difference]: Finished difference Result 18694 states and 29540 transitions. [2021-11-20 23:50:15,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:50:15,555 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 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 143 [2021-11-20 23:50:15,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:15,630 INFO L225 Difference]: With dead ends: 18694 [2021-11-20 23:50:15,631 INFO L226 Difference]: Without dead ends: 12979 [2021-11-20 23:50:15,662 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:50:15,663 INFO L933 BasicCegarLoop]: 3356 mSDtfsCounter, 3546 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3546 SdHoareTripleChecker+Valid, 3596 SdHoareTripleChecker+Invalid, 324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:50:15,663 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3546 Valid, 3596 Invalid, 324 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:50:15,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12979 states. [2021-11-20 23:50:16,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12979 to 12945. [2021-11-20 23:50:16,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12945 states, 11243 states have (on average 1.574579738503958) internal successors, (17703), 11277 states have internal predecessors, (17703), 1316 states have call successors, (1316), 384 states have call predecessors, (1316), 384 states have return successors, (1316), 1284 states have call predecessors, (1316), 1316 states have call successors, (1316) [2021-11-20 23:50:16,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12945 states to 12945 states and 20335 transitions. [2021-11-20 23:50:16,369 INFO L78 Accepts]: Start accepts. Automaton has 12945 states and 20335 transitions. Word has length 143 [2021-11-20 23:50:16,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:16,370 INFO L470 AbstractCegarLoop]: Abstraction has 12945 states and 20335 transitions. [2021-11-20 23:50:16,371 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 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) [2021-11-20 23:50:16,371 INFO L276 IsEmpty]: Start isEmpty. Operand 12945 states and 20335 transitions. [2021-11-20 23:50:16,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-20 23:50:16,408 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:16,408 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-20 23:50:16,446 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 23:50:16,624 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:16,625 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:16,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:16,625 INFO L85 PathProgramCache]: Analyzing trace with hash 510698301, now seen corresponding path program 1 times [2021-11-20 23:50:16,625 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:16,625 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2043750816] [2021-11-20 23:50:16,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:16,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:16,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:16,747 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-20 23:50:16,747 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:16,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2043750816] [2021-11-20 23:50:16,748 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2043750816] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:50:16,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [325909234] [2021-11-20 23:50:16,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:16,748 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:16,749 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:50:16,750 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:50:16,768 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 23:50:16,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:16,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 1086 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 23:50:17,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:50:17,312 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-20 23:50:17,312 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:50:17,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [325909234] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:50:17,313 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:50:17,313 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-20 23:50:17,314 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1330439413] [2021-11-20 23:50:17,314 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:50:17,314 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:50:17,315 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:17,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:50:17,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:50:17,316 INFO L87 Difference]: Start difference. First operand 12945 states and 20335 transitions. Second operand has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 2 states have internal predecessors, (116), 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) [2021-11-20 23:50:18,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:18,585 INFO L93 Difference]: Finished difference Result 35350 states and 54996 transitions. [2021-11-20 23:50:18,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:50:18,586 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 2 states have internal predecessors, (116), 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 143 [2021-11-20 23:50:18,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:18,712 INFO L225 Difference]: With dead ends: 35350 [2021-11-20 23:50:18,713 INFO L226 Difference]: Without dead ends: 24051 [2021-11-20 23:50:18,780 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:50:18,782 INFO L933 BasicCegarLoop]: 3326 mSDtfsCounter, 3516 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3516 SdHoareTripleChecker+Valid, 3566 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:50:18,784 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3516 Valid, 3566 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:50:18,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24051 states. [2021-11-20 23:50:20,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24051 to 23985. [2021-11-20 23:50:20,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23985 states, 20651 states have (on average 1.53750423708295) internal successors, (31751), 20717 states have internal predecessors, (31751), 2564 states have call successors, (2564), 768 states have call predecessors, (2564), 768 states have return successors, (2564), 2500 states have call predecessors, (2564), 2564 states have call successors, (2564) [2021-11-20 23:50:20,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23985 states to 23985 states and 36879 transitions. [2021-11-20 23:50:20,367 INFO L78 Accepts]: Start accepts. Automaton has 23985 states and 36879 transitions. Word has length 143 [2021-11-20 23:50:20,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:20,367 INFO L470 AbstractCegarLoop]: Abstraction has 23985 states and 36879 transitions. [2021-11-20 23:50:20,368 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 2 states have internal predecessors, (116), 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) [2021-11-20 23:50:20,368 INFO L276 IsEmpty]: Start isEmpty. Operand 23985 states and 36879 transitions. [2021-11-20 23:50:20,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-20 23:50:20,423 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:20,424 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-20 23:50:20,464 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 23:50:20,648 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:20,649 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:20,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:20,649 INFO L85 PathProgramCache]: Analyzing trace with hash -898521861, now seen corresponding path program 1 times [2021-11-20 23:50:20,649 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:20,649 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [296469511] [2021-11-20 23:50:20,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:20,650 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:20,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:20,766 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-20 23:50:20,766 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:20,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [296469511] [2021-11-20 23:50:20,767 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [296469511] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:50:20,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2082269626] [2021-11-20 23:50:20,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:20,767 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:20,768 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:50:20,768 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:50:20,788 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 23:50:21,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:21,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 1080 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-20 23:50:21,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:50:21,301 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-20 23:50:21,301 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:50:21,302 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2082269626] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:50:21,302 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:50:21,302 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-20 23:50:21,302 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1568778559] [2021-11-20 23:50:21,303 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:50:21,303 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:50:21,303 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:21,304 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:50:21,304 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:50:21,304 INFO L87 Difference]: Start difference. First operand 23985 states and 36879 transitions. Second operand has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 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) [2021-11-20 23:50:23,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:23,277 INFO L93 Difference]: Finished difference Result 68278 states and 105108 transitions. [2021-11-20 23:50:23,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:50:23,278 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 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 143 [2021-11-20 23:50:23,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:23,545 INFO L225 Difference]: With dead ends: 68278 [2021-11-20 23:50:23,545 INFO L226 Difference]: Without dead ends: 45939 [2021-11-20 23:50:23,650 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:50:23,651 INFO L933 BasicCegarLoop]: 3326 mSDtfsCounter, 3531 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3531 SdHoareTripleChecker+Valid, 3566 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:50:23,651 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3531 Valid, 3566 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:50:23,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45939 states. [2021-11-20 23:50:25,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45939 to 45809. [2021-11-20 23:50:25,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45809 states, 39275 states have (on average 1.514016549968173) internal successors, (59463), 39405 states have internal predecessors, (59463), 4996 states have call successors, (4996), 1536 states have call predecessors, (4996), 1536 states have return successors, (4996), 4868 states have call predecessors, (4996), 4996 states have call successors, (4996) [2021-11-20 23:50:25,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45809 states to 45809 states and 69455 transitions. [2021-11-20 23:50:25,959 INFO L78 Accepts]: Start accepts. Automaton has 45809 states and 69455 transitions. Word has length 143 [2021-11-20 23:50:25,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:25,960 INFO L470 AbstractCegarLoop]: Abstraction has 45809 states and 69455 transitions. [2021-11-20 23:50:25,960 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 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) [2021-11-20 23:50:25,960 INFO L276 IsEmpty]: Start isEmpty. Operand 45809 states and 69455 transitions. [2021-11-20 23:50:26,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-20 23:50:26,369 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:26,370 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-20 23:50:26,406 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 23:50:26,596 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a3f36de0-44bd-470e-a85c-cb4257105cd9/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-20 23:50:26,597 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:26,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:26,597 INFO L85 PathProgramCache]: Analyzing trace with hash 2020683645, now seen corresponding path program 1 times [2021-11-20 23:50:26,597 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:26,597 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2125179393] [2021-11-20 23:50:26,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:26,598 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:26,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:26,759 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-20 23:50:26,759 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:26,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2125179393] [2021-11-20 23:50:26,760 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2125179393] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:50:26,760 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:50:26,760 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-20 23:50:26,763 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630540836] [2021-11-20 23:50:26,763 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:50:26,764 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-20 23:50:26,764 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:26,765 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-20 23:50:26,765 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:50:26,765 INFO L87 Difference]: Start difference. First operand 45809 states and 69455 transitions. Second operand has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 4 states have call successors, (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) [2021-11-20 23:50:31,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:31,653 INFO L93 Difference]: Finished difference Result 156917 states and 235730 transitions. [2021-11-20 23:50:31,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-20 23:50:31,653 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 4 states have call successors, (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 143 [2021-11-20 23:50:31,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:32,226 INFO L225 Difference]: With dead ends: 156917 [2021-11-20 23:50:32,226 INFO L226 Difference]: Without dead ends: 112755 [2021-11-20 23:50:32,559 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 [2021-11-20 23:50:32,563 INFO L933 BasicCegarLoop]: 3329 mSDtfsCounter, 4482 mSDsluCounter, 7126 mSDsCounter, 0 mSdLazyCounter, 949 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4504 SdHoareTripleChecker+Valid, 9930 SdHoareTripleChecker+Invalid, 1101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 949 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:50:32,564 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4504 Valid, 9930 Invalid, 1101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 949 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-20 23:50:32,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112755 states. [2021-11-20 23:50:36,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112755 to 88433. [2021-11-20 23:50:36,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88433 states, 75627 states have (on average 1.4988165602232006) internal successors, (113351), 75885 states have internal predecessors, (113351), 9732 states have call successors, (9732), 3072 states have call predecessors, (9732), 3072 states have return successors, (9732), 9476 states have call predecessors, (9732), 9732 states have call successors, (9732) [2021-11-20 23:50:36,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88433 states to 88433 states and 132815 transitions. [2021-11-20 23:50:36,908 INFO L78 Accepts]: Start accepts. Automaton has 88433 states and 132815 transitions. Word has length 143 [2021-11-20 23:50:36,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:36,910 INFO L470 AbstractCegarLoop]: Abstraction has 88433 states and 132815 transitions. [2021-11-20 23:50:36,911 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 4 states have call successors, (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) [2021-11-20 23:50:36,911 INFO L276 IsEmpty]: Start isEmpty. Operand 88433 states and 132815 transitions. [2021-11-20 23:50:37,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-20 23:50:37,032 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:37,032 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-20 23:50:37,032 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-20 23:50:37,033 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:37,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:37,033 INFO L85 PathProgramCache]: Analyzing trace with hash -1402596620, now seen corresponding path program 1 times [2021-11-20 23:50:37,033 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:37,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [536149536] [2021-11-20 23:50:37,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:37,034 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:37,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:37,187 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-20 23:50:37,188 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:37,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [536149536] [2021-11-20 23:50:37,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [536149536] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:50:37,188 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:50:37,189 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-20 23:50:37,189 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609015323] [2021-11-20 23:50:37,189 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:50:37,190 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-20 23:50:37,190 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:37,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-20 23:50:37,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:50:37,191 INFO L87 Difference]: Start difference. First operand 88433 states and 132815 transitions. Second operand has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 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) [2021-11-20 23:50:43,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:43,744 INFO L93 Difference]: Finished difference Result 238325 states and 357457 transitions. [2021-11-20 23:50:43,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-20 23:50:43,745 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 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 144 [2021-11-20 23:50:43,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:44,807 INFO L225 Difference]: With dead ends: 238325 [2021-11-20 23:50:44,807 INFO L226 Difference]: Without dead ends: 151539 [2021-11-20 23:50:45,084 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 [2021-11-20 23:50:45,085 INFO L933 BasicCegarLoop]: 3321 mSDtfsCounter, 4253 mSDsluCounter, 10682 mSDsCounter, 0 mSdLazyCounter, 1257 mSolverCounterSat, 160 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4259 SdHoareTripleChecker+Valid, 13220 SdHoareTripleChecker+Invalid, 1417 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 160 IncrementalHoareTripleChecker+Valid, 1257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:50:45,086 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4259 Valid, 13220 Invalid, 1417 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [160 Valid, 1257 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-20 23:50:45,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151539 states. [2021-11-20 23:50:50,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151539 to 130801. [2021-11-20 23:50:50,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130801 states, 111723 states have (on average 1.4911790768239306) internal successors, (166599), 112109 states have internal predecessors, (166599), 14468 states have call successors, (14468), 4608 states have call predecessors, (14468), 4608 states have return successors, (14468), 14084 states have call predecessors, (14468), 14468 states have call successors, (14468) [2021-11-20 23:50:51,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130801 states to 130801 states and 195535 transitions. [2021-11-20 23:50:51,582 INFO L78 Accepts]: Start accepts. Automaton has 130801 states and 195535 transitions. Word has length 144 [2021-11-20 23:50:51,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:51,583 INFO L470 AbstractCegarLoop]: Abstraction has 130801 states and 195535 transitions. [2021-11-20 23:50:51,583 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 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) [2021-11-20 23:50:51,583 INFO L276 IsEmpty]: Start isEmpty. Operand 130801 states and 195535 transitions. [2021-11-20 23:50:51,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-20 23:50:51,742 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:51,742 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-20 23:50:51,742 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-20 23:50:51,743 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:51,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:51,743 INFO L85 PathProgramCache]: Analyzing trace with hash -1958810147, now seen corresponding path program 1 times [2021-11-20 23:50:51,744 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:51,744 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2067666440] [2021-11-20 23:50:51,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:51,744 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:51,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:51,876 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-20 23:50:51,876 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:51,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2067666440] [2021-11-20 23:50:51,876 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2067666440] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:50:51,877 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:50:51,877 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-20 23:50:51,877 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [492513683] [2021-11-20 23:50:51,877 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:50:51,878 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-20 23:50:51,878 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:51,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-20 23:50:51,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:50:51,879 INFO L87 Difference]: Start difference. First operand 130801 states and 195535 transitions. Second operand has 6 states, 6 states have (on average 14.166666666666666) internal successors, (85), 6 states have internal predecessors, (85), 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)