./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.6.1.ufo.BOUNDED-12.pals.c.v+cfa-reducer.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0f8a17c6 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ea7b072-ea85-4cd6-b5b1-4a689c1fcd42/bin/utaipan-UbGMyvGFUs/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ea7b072-ea85-4cd6-b5b1-4a689c1fcd42/bin/utaipan-UbGMyvGFUs/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ea7b072-ea85-4cd6-b5b1-4a689c1fcd42/bin/utaipan-UbGMyvGFUs/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ea7b072-ea85-4cd6-b5b1-4a689c1fcd42/bin/utaipan-UbGMyvGFUs/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.6.1.ufo.BOUNDED-12.pals.c.v+cfa-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ea7b072-ea85-4cd6-b5b1-4a689c1fcd42/bin/utaipan-UbGMyvGFUs/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ea7b072-ea85-4cd6-b5b1-4a689c1fcd42/bin/utaipan-UbGMyvGFUs --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 b86eed5380d57cac13df908fa4bd28a3c3af485a2a70f27e08920aaaec0ccb21 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-0f8a17c [2021-11-19 15:44:43,288 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-19 15:44:43,292 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-19 15:44:43,348 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-19 15:44:43,349 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-19 15:44:43,353 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-19 15:44:43,355 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-19 15:44:43,359 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-19 15:44:43,362 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-19 15:44:43,368 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-19 15:44:43,369 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-19 15:44:43,371 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-19 15:44:43,371 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-19 15:44:43,374 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-19 15:44:43,376 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-19 15:44:43,384 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-19 15:44:43,386 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-19 15:44:43,387 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-19 15:44:43,390 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-19 15:44:43,398 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-19 15:44:43,400 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-19 15:44:43,401 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-19 15:44:43,404 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-19 15:44:43,406 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-19 15:44:43,415 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-19 15:44:43,415 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-19 15:44:43,416 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-19 15:44:43,418 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-19 15:44:43,418 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-19 15:44:43,420 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-19 15:44:43,420 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-19 15:44:43,422 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-19 15:44:43,423 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-19 15:44:43,425 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-19 15:44:43,427 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-19 15:44:43,427 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-19 15:44:43,428 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-19 15:44:43,428 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-19 15:44:43,428 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-19 15:44:43,429 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-19 15:44:43,430 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-19 15:44:43,431 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ea7b072-ea85-4cd6-b5b1-4a689c1fcd42/bin/utaipan-UbGMyvGFUs/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-19 15:44:43,474 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-19 15:44:43,474 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-19 15:44:43,475 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-19 15:44:43,476 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-19 15:44:43,476 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-19 15:44:43,476 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-19 15:44:43,476 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-19 15:44:43,476 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-19 15:44:43,483 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-19 15:44:43,483 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-19 15:44:43,484 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-19 15:44:43,484 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-19 15:44:43,484 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-19 15:44:43,485 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-19 15:44:43,485 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-19 15:44:43,485 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-19 15:44:43,486 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-19 15:44:43,487 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-19 15:44:43,487 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-19 15:44:43,487 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-19 15:44:43,487 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-19 15:44:43,487 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-19 15:44:43,488 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-19 15:44:43,488 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-19 15:44:43,488 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-19 15:44:43,488 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-19 15:44:43,488 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-19 15:44:43,489 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-19 15:44:43,489 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-19 15:44:43,491 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-19 15:44:43,491 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-19 15:44:43,491 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 15:44:43,491 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-19 15:44:43,492 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-19 15:44:43,492 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-19 15:44:43,492 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-19 15:44:43,492 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-19 15:44:43,492 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-19 15:44:43,493 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-19 15:44:43,493 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-19 15:44:43,493 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_4ea7b072-ea85-4cd6-b5b1-4a689c1fcd42/bin/utaipan-UbGMyvGFUs/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ea7b072-ea85-4cd6-b5b1-4a689c1fcd42/bin/utaipan-UbGMyvGFUs Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b86eed5380d57cac13df908fa4bd28a3c3af485a2a70f27e08920aaaec0ccb21 [2021-11-19 15:44:43,803 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-19 15:44:43,838 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-19 15:44:43,840 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-19 15:44:43,841 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-19 15:44:43,842 INFO L275 PluginConnector]: CDTParser initialized [2021-11-19 15:44:43,844 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ea7b072-ea85-4cd6-b5b1-4a689c1fcd42/bin/utaipan-UbGMyvGFUs/../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.6.1.ufo.BOUNDED-12.pals.c.v+cfa-reducer.c [2021-11-19 15:44:43,932 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ea7b072-ea85-4cd6-b5b1-4a689c1fcd42/bin/utaipan-UbGMyvGFUs/data/763ef9dc4/f649d10952974b80aa87afc5ed6d0119/FLAG4f71b2731 [2021-11-19 15:44:44,414 INFO L306 CDTParser]: Found 1 translation units. [2021-11-19 15:44:44,414 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ea7b072-ea85-4cd6-b5b1-4a689c1fcd42/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.6.1.ufo.BOUNDED-12.pals.c.v+cfa-reducer.c [2021-11-19 15:44:44,425 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ea7b072-ea85-4cd6-b5b1-4a689c1fcd42/bin/utaipan-UbGMyvGFUs/data/763ef9dc4/f649d10952974b80aa87afc5ed6d0119/FLAG4f71b2731 [2021-11-19 15:44:44,753 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ea7b072-ea85-4cd6-b5b1-4a689c1fcd42/bin/utaipan-UbGMyvGFUs/data/763ef9dc4/f649d10952974b80aa87afc5ed6d0119 [2021-11-19 15:44:44,756 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-19 15:44:44,757 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-19 15:44:44,764 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-19 15:44:44,764 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-19 15:44:44,767 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-19 15:44:44,768 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 03:44:44" (1/1) ... [2021-11-19 15:44:44,769 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@250cc9cc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:44:44, skipping insertion in model container [2021-11-19 15:44:44,770 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 03:44:44" (1/1) ... [2021-11-19 15:44:44,778 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-19 15:44:44,846 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-19 15:44:45,070 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_4ea7b072-ea85-4cd6-b5b1-4a689c1fcd42/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.6.1.ufo.BOUNDED-12.pals.c.v+cfa-reducer.c[6696,6709] [2021-11-19 15:44:45,101 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 15:44:45,116 INFO L203 MainTranslator]: Completed pre-run [2021-11-19 15:44:45,164 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_4ea7b072-ea85-4cd6-b5b1-4a689c1fcd42/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.6.1.ufo.BOUNDED-12.pals.c.v+cfa-reducer.c[6696,6709] [2021-11-19 15:44:45,203 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 15:44:45,227 INFO L208 MainTranslator]: Completed translation [2021-11-19 15:44:45,227 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:44:45 WrapperNode [2021-11-19 15:44:45,227 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-19 15:44:45,228 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-19 15:44:45,229 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-19 15:44:45,229 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-19 15:44:45,237 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:44:45" (1/1) ... [2021-11-19 15:44:45,248 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:44:45" (1/1) ... [2021-11-19 15:44:45,287 INFO L137 Inliner]: procedures = 25, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 496 [2021-11-19 15:44:45,288 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-19 15:44:45,289 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-19 15:44:45,289 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-19 15:44:45,289 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-19 15:44:45,298 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:44:45" (1/1) ... [2021-11-19 15:44:45,298 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:44:45" (1/1) ... [2021-11-19 15:44:45,303 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:44:45" (1/1) ... [2021-11-19 15:44:45,304 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:44:45" (1/1) ... [2021-11-19 15:44:45,329 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:44:45" (1/1) ... [2021-11-19 15:44:45,335 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:44:45" (1/1) ... [2021-11-19 15:44:45,338 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:44:45" (1/1) ... [2021-11-19 15:44:45,358 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-19 15:44:45,359 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-19 15:44:45,360 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-19 15:44:45,360 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-19 15:44:45,361 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:44:45" (1/1) ... [2021-11-19 15:44:45,370 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 15:44:45,383 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ea7b072-ea85-4cd6-b5b1-4a689c1fcd42/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:44:45,402 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ea7b072-ea85-4cd6-b5b1-4a689c1fcd42/bin/utaipan-UbGMyvGFUs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-19 15:44:45,413 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ea7b072-ea85-4cd6-b5b1-4a689c1fcd42/bin/utaipan-UbGMyvGFUs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-19 15:44:45,447 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-19 15:44:45,447 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-19 15:44:45,447 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-19 15:44:45,447 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-19 15:44:45,549 INFO L236 CfgBuilder]: Building ICFG [2021-11-19 15:44:45,551 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-19 15:44:46,152 INFO L277 CfgBuilder]: Performing block encoding [2021-11-19 15:44:46,323 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-19 15:44:46,323 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-19 15:44:46,326 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 03:44:46 BoogieIcfgContainer [2021-11-19 15:44:46,326 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-19 15:44:46,328 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-19 15:44:46,328 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-19 15:44:46,331 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-19 15:44:46,332 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 03:44:44" (1/3) ... [2021-11-19 15:44:46,333 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9dbb8ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 03:44:46, skipping insertion in model container [2021-11-19 15:44:46,333 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 03:44:45" (2/3) ... [2021-11-19 15:44:46,333 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9dbb8ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 03:44:46, skipping insertion in model container [2021-11-19 15:44:46,333 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 03:44:46" (3/3) ... [2021-11-19 15:44:46,335 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr.6.1.ufo.BOUNDED-12.pals.c.v+cfa-reducer.c [2021-11-19 15:44:46,340 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-19 15:44:46,340 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-19 15:44:46,406 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-19 15:44:46,412 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 [2021-11-19 15:44:46,412 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-19 15:44:46,428 INFO L276 IsEmpty]: Start isEmpty. Operand has 89 states, 87 states have (on average 1.7471264367816093) internal successors, (152), 88 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:46,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-19 15:44:46,437 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:44:46,437 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] [2021-11-19 15:44:46,438 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:44:46,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:44:46,443 INFO L85 PathProgramCache]: Analyzing trace with hash 2033501881, now seen corresponding path program 1 times [2021-11-19 15:44:46,452 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:44:46,452 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1518374005] [2021-11-19 15:44:46,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:44:46,453 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:44:46,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:44:46,789 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:44:46,790 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:44:46,790 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1518374005] [2021-11-19 15:44:46,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1518374005] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 15:44:46,791 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 15:44:46,791 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 15:44:46,793 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921671392] [2021-11-19 15:44:46,794 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:44:46,798 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 15:44:46,799 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:44:46,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 15:44:46,827 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 15:44:46,829 INFO L87 Difference]: Start difference. First operand has 89 states, 87 states have (on average 1.7471264367816093) internal successors, (152), 88 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:46,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:44:46,919 INFO L93 Difference]: Finished difference Result 179 states and 284 transitions. [2021-11-19 15:44:46,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 15:44:46,922 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2021-11-19 15:44:46,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:44:46,932 INFO L225 Difference]: With dead ends: 179 [2021-11-19 15:44:46,932 INFO L226 Difference]: Without dead ends: 128 [2021-11-19 15:44:46,935 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 15:44:46,939 INFO L933 BasicCegarLoop]: 192 mSDtfsCounter, 101 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 253 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 15:44:46,940 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [101 Valid, 253 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 15:44:46,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-19 15:44:46,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 126. [2021-11-19 15:44:46,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 125 states have (on average 1.328) internal successors, (166), 125 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:46,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 166 transitions. [2021-11-19 15:44:46,987 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 166 transitions. Word has length 59 [2021-11-19 15:44:46,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:44:46,988 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 166 transitions. [2021-11-19 15:44:46,988 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:46,989 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 166 transitions. [2021-11-19 15:44:46,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-19 15:44:46,991 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:44:46,992 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] [2021-11-19 15:44:46,992 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-19 15:44:46,992 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:44:46,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:44:46,993 INFO L85 PathProgramCache]: Analyzing trace with hash 1181302857, now seen corresponding path program 1 times [2021-11-19 15:44:46,993 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:44:46,994 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1943139248] [2021-11-19 15:44:46,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:44:46,994 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:44:47,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:44:47,181 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:44:47,181 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:44:47,181 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1943139248] [2021-11-19 15:44:47,181 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1943139248] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 15:44:47,182 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 15:44:47,182 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 15:44:47,182 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [220782251] [2021-11-19 15:44:47,182 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:44:47,184 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 15:44:47,184 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:44:47,184 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 15:44:47,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 15:44:47,185 INFO L87 Difference]: Start difference. First operand 126 states and 166 transitions. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:47,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:44:47,287 INFO L93 Difference]: Finished difference Result 286 states and 402 transitions. [2021-11-19 15:44:47,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 15:44:47,288 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 62 [2021-11-19 15:44:47,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:44:47,291 INFO L225 Difference]: With dead ends: 286 [2021-11-19 15:44:47,291 INFO L226 Difference]: Without dead ends: 202 [2021-11-19 15:44:47,292 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 15:44:47,293 INFO L933 BasicCegarLoop]: 142 mSDtfsCounter, 58 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 15:44:47,294 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 202 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 15:44:47,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2021-11-19 15:44:47,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 200. [2021-11-19 15:44:47,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 199 states have (on average 1.3819095477386936) internal successors, (275), 199 states have internal predecessors, (275), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:47,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 275 transitions. [2021-11-19 15:44:47,335 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 275 transitions. Word has length 62 [2021-11-19 15:44:47,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:44:47,336 INFO L470 AbstractCegarLoop]: Abstraction has 200 states and 275 transitions. [2021-11-19 15:44:47,336 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:47,337 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 275 transitions. [2021-11-19 15:44:47,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-19 15:44:47,348 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:44:47,348 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] [2021-11-19 15:44:47,348 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-19 15:44:47,349 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:44:47,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:44:47,349 INFO L85 PathProgramCache]: Analyzing trace with hash -155062584, now seen corresponding path program 1 times [2021-11-19 15:44:47,350 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:44:47,350 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [123238382] [2021-11-19 15:44:47,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:44:47,350 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:44:47,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:44:47,464 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:44:47,465 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:44:47,465 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [123238382] [2021-11-19 15:44:47,465 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [123238382] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 15:44:47,465 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 15:44:47,465 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 15:44:47,466 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [356040724] [2021-11-19 15:44:47,466 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:44:47,466 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 15:44:47,467 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:44:47,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 15:44:47,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 15:44:47,468 INFO L87 Difference]: Start difference. First operand 200 states and 275 transitions. Second operand has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:47,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:44:47,534 INFO L93 Difference]: Finished difference Result 500 states and 717 transitions. [2021-11-19 15:44:47,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 15:44:47,535 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2021-11-19 15:44:47,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:44:47,539 INFO L225 Difference]: With dead ends: 500 [2021-11-19 15:44:47,539 INFO L226 Difference]: Without dead ends: 342 [2021-11-19 15:44:47,541 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 15:44:47,543 INFO L933 BasicCegarLoop]: 134 mSDtfsCounter, 53 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 198 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 15:44:47,543 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 198 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 15:44:47,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 342 states. [2021-11-19 15:44:47,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 342 to 340. [2021-11-19 15:44:47,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 340 states, 339 states have (on average 1.4129793510324484) internal successors, (479), 339 states have internal predecessors, (479), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:47,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 340 states to 340 states and 479 transitions. [2021-11-19 15:44:47,575 INFO L78 Accepts]: Start accepts. Automaton has 340 states and 479 transitions. Word has length 65 [2021-11-19 15:44:47,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:44:47,576 INFO L470 AbstractCegarLoop]: Abstraction has 340 states and 479 transitions. [2021-11-19 15:44:47,576 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:47,577 INFO L276 IsEmpty]: Start isEmpty. Operand 340 states and 479 transitions. [2021-11-19 15:44:47,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-19 15:44:47,578 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:44:47,578 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] [2021-11-19 15:44:47,578 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-19 15:44:47,579 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:44:47,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:44:47,579 INFO L85 PathProgramCache]: Analyzing trace with hash 1933041947, now seen corresponding path program 1 times [2021-11-19 15:44:47,580 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:44:47,580 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1461696068] [2021-11-19 15:44:47,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:44:47,580 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:44:47,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:44:47,653 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:44:47,653 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:44:47,653 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1461696068] [2021-11-19 15:44:47,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1461696068] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 15:44:47,654 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 15:44:47,654 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 15:44:47,654 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638409933] [2021-11-19 15:44:47,654 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:44:47,655 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 15:44:47,655 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:44:47,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 15:44:47,656 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 15:44:47,656 INFO L87 Difference]: Start difference. First operand 340 states and 479 transitions. Second operand has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:47,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:44:47,752 INFO L93 Difference]: Finished difference Result 904 states and 1305 transitions. [2021-11-19 15:44:47,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 15:44:47,753 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-19 15:44:47,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:44:47,757 INFO L225 Difference]: With dead ends: 904 [2021-11-19 15:44:47,757 INFO L226 Difference]: Without dead ends: 606 [2021-11-19 15:44:47,759 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 15:44:47,761 INFO L933 BasicCegarLoop]: 126 mSDtfsCounter, 48 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 194 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 15:44:47,762 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 194 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 15:44:47,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 606 states. [2021-11-19 15:44:47,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 606 to 604. [2021-11-19 15:44:47,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 604 states, 603 states have (on average 1.4245439469320067) internal successors, (859), 603 states have internal predecessors, (859), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:47,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 604 states to 604 states and 859 transitions. [2021-11-19 15:44:47,814 INFO L78 Accepts]: Start accepts. Automaton has 604 states and 859 transitions. Word has length 68 [2021-11-19 15:44:47,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:44:47,815 INFO L470 AbstractCegarLoop]: Abstraction has 604 states and 859 transitions. [2021-11-19 15:44:47,815 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:47,817 INFO L276 IsEmpty]: Start isEmpty. Operand 604 states and 859 transitions. [2021-11-19 15:44:47,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-19 15:44:47,825 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:44:47,826 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, 1] [2021-11-19 15:44:47,826 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-19 15:44:47,826 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:44:47,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:44:47,831 INFO L85 PathProgramCache]: Analyzing trace with hash 165325669, now seen corresponding path program 1 times [2021-11-19 15:44:47,831 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:44:47,831 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1784186340] [2021-11-19 15:44:47,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:44:47,832 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:44:47,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:44:47,969 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:44:47,970 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:44:47,970 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1784186340] [2021-11-19 15:44:47,970 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1784186340] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 15:44:47,970 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 15:44:47,970 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 15:44:47,971 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [441248553] [2021-11-19 15:44:47,971 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:44:47,971 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 15:44:47,971 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:44:47,972 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 15:44:47,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 15:44:47,972 INFO L87 Difference]: Start difference. First operand 604 states and 859 transitions. Second operand has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:48,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:44:48,118 INFO L93 Difference]: Finished difference Result 1664 states and 2397 transitions. [2021-11-19 15:44:48,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 15:44:48,119 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2021-11-19 15:44:48,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:44:48,127 INFO L225 Difference]: With dead ends: 1664 [2021-11-19 15:44:48,127 INFO L226 Difference]: Without dead ends: 1102 [2021-11-19 15:44:48,128 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 15:44:48,132 INFO L933 BasicCegarLoop]: 118 mSDtfsCounter, 43 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 190 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 15:44:48,133 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 190 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 15:44:48,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1102 states. [2021-11-19 15:44:48,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1102 to 1100. [2021-11-19 15:44:48,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1100 states, 1099 states have (on average 1.4222020018198362) internal successors, (1563), 1099 states have internal predecessors, (1563), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:48,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1100 states to 1100 states and 1563 transitions. [2021-11-19 15:44:48,222 INFO L78 Accepts]: Start accepts. Automaton has 1100 states and 1563 transitions. Word has length 71 [2021-11-19 15:44:48,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:44:48,225 INFO L470 AbstractCegarLoop]: Abstraction has 1100 states and 1563 transitions. [2021-11-19 15:44:48,226 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:48,226 INFO L276 IsEmpty]: Start isEmpty. Operand 1100 states and 1563 transitions. [2021-11-19 15:44:48,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-19 15:44:48,228 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:44:48,234 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, 1, 1, 1, 1] [2021-11-19 15:44:48,235 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-19 15:44:48,235 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:44:48,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:44:48,237 INFO L85 PathProgramCache]: Analyzing trace with hash -945514294, now seen corresponding path program 1 times [2021-11-19 15:44:48,237 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:44:48,238 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2033569411] [2021-11-19 15:44:48,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:44:48,238 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:44:48,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:44:48,346 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:44:48,346 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:44:48,347 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2033569411] [2021-11-19 15:44:48,347 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2033569411] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 15:44:48,347 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 15:44:48,347 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 15:44:48,347 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759063059] [2021-11-19 15:44:48,347 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:44:48,349 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 15:44:48,349 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:44:48,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 15:44:48,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 15:44:48,350 INFO L87 Difference]: Start difference. First operand 1100 states and 1563 transitions. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:48,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:44:48,572 INFO L93 Difference]: Finished difference Result 3088 states and 4413 transitions. [2021-11-19 15:44:48,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 15:44:48,573 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-19 15:44:48,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:44:48,585 INFO L225 Difference]: With dead ends: 3088 [2021-11-19 15:44:48,585 INFO L226 Difference]: Without dead ends: 2030 [2021-11-19 15:44:48,587 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 15:44:48,589 INFO L933 BasicCegarLoop]: 110 mSDtfsCounter, 38 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 186 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 15:44:48,589 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 186 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 15:44:48,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2030 states. [2021-11-19 15:44:48,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2030 to 2028. [2021-11-19 15:44:48,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2028 states, 2027 states have (on average 1.4104588061174148) internal successors, (2859), 2027 states have internal predecessors, (2859), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:48,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2028 states to 2028 states and 2859 transitions. [2021-11-19 15:44:48,774 INFO L78 Accepts]: Start accepts. Automaton has 2028 states and 2859 transitions. Word has length 74 [2021-11-19 15:44:48,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:44:48,775 INFO L470 AbstractCegarLoop]: Abstraction has 2028 states and 2859 transitions. [2021-11-19 15:44:48,775 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:48,775 INFO L276 IsEmpty]: Start isEmpty. Operand 2028 states and 2859 transitions. [2021-11-19 15:44:48,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-19 15:44:48,776 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:44:48,776 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, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:44:48,776 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-19 15:44:48,777 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:44:48,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:44:48,777 INFO L85 PathProgramCache]: Analyzing trace with hash 88724831, now seen corresponding path program 1 times [2021-11-19 15:44:48,778 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:44:48,778 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1041928935] [2021-11-19 15:44:48,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:44:48,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:44:48,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:44:48,871 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:44:48,871 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:44:48,871 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1041928935] [2021-11-19 15:44:48,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1041928935] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 15:44:48,872 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 15:44:48,872 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-19 15:44:48,872 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1102777256] [2021-11-19 15:44:48,872 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:44:48,873 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-19 15:44:48,873 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:44:48,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-19 15:44:48,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-19 15:44:48,874 INFO L87 Difference]: Start difference. First operand 2028 states and 2859 transitions. Second operand has 8 states, 8 states have (on average 9.625) internal successors, (77), 8 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:49,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:44:49,929 INFO L93 Difference]: Finished difference Result 8258 states and 11740 transitions. [2021-11-19 15:44:49,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-19 15:44:49,930 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 9.625) internal successors, (77), 8 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 77 [2021-11-19 15:44:49,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:44:49,967 INFO L225 Difference]: With dead ends: 8258 [2021-11-19 15:44:49,967 INFO L226 Difference]: Without dead ends: 6272 [2021-11-19 15:44:49,974 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=91, Invalid=181, Unknown=0, NotChecked=0, Total=272 [2021-11-19 15:44:49,975 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 800 mSDsluCounter, 2072 mSDsCounter, 0 mSdLazyCounter, 337 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 800 SdHoareTripleChecker+Valid, 2134 SdHoareTripleChecker+Invalid, 347 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 337 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 15:44:49,975 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [800 Valid, 2134 Invalid, 347 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 337 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-19 15:44:49,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6272 states. [2021-11-19 15:44:50,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6272 to 2728. [2021-11-19 15:44:50,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2728 states, 2727 states have (on average 1.3986065273193986) internal successors, (3814), 2727 states have internal predecessors, (3814), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:50,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2728 states to 2728 states and 3814 transitions. [2021-11-19 15:44:50,317 INFO L78 Accepts]: Start accepts. Automaton has 2728 states and 3814 transitions. Word has length 77 [2021-11-19 15:44:50,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:44:50,317 INFO L470 AbstractCegarLoop]: Abstraction has 2728 states and 3814 transitions. [2021-11-19 15:44:50,318 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 9.625) internal successors, (77), 8 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:50,318 INFO L276 IsEmpty]: Start isEmpty. Operand 2728 states and 3814 transitions. [2021-11-19 15:44:50,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-19 15:44:50,322 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:44:50,323 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:44:50,323 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-19 15:44:50,323 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:44:50,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:44:50,327 INFO L85 PathProgramCache]: Analyzing trace with hash -1548470038, now seen corresponding path program 1 times [2021-11-19 15:44:50,327 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:44:50,327 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [83353360] [2021-11-19 15:44:50,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:44:50,328 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:44:50,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:44:50,406 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:44:50,406 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:44:50,406 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [83353360] [2021-11-19 15:44:50,406 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [83353360] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 15:44:50,407 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 15:44:50,407 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-19 15:44:50,407 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423563702] [2021-11-19 15:44:50,407 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:44:50,408 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 15:44:50,408 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:44:50,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 15:44:50,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 15:44:50,409 INFO L87 Difference]: Start difference. First operand 2728 states and 3814 transitions. Second operand has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:50,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:44:50,859 INFO L93 Difference]: Finished difference Result 6982 states and 9840 transitions. [2021-11-19 15:44:50,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 15:44:50,860 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 79 [2021-11-19 15:44:50,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:44:50,885 INFO L225 Difference]: With dead ends: 6982 [2021-11-19 15:44:50,886 INFO L226 Difference]: Without dead ends: 4296 [2021-11-19 15:44:50,891 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 15:44:50,892 INFO L933 BasicCegarLoop]: 100 mSDtfsCounter, 32 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 15:44:50,893 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 157 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 15:44:50,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4296 states. [2021-11-19 15:44:51,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4296 to 4294. [2021-11-19 15:44:51,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4294 states, 4293 states have (on average 1.4055439086885628) internal successors, (6034), 4293 states have internal predecessors, (6034), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:51,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4294 states to 4294 states and 6034 transitions. [2021-11-19 15:44:51,353 INFO L78 Accepts]: Start accepts. Automaton has 4294 states and 6034 transitions. Word has length 79 [2021-11-19 15:44:51,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:44:51,354 INFO L470 AbstractCegarLoop]: Abstraction has 4294 states and 6034 transitions. [2021-11-19 15:44:51,354 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:51,354 INFO L276 IsEmpty]: Start isEmpty. Operand 4294 states and 6034 transitions. [2021-11-19 15:44:51,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-19 15:44:51,355 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:44:51,355 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:44:51,356 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-19 15:44:51,356 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:44:51,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:44:51,357 INFO L85 PathProgramCache]: Analyzing trace with hash -1535600326, now seen corresponding path program 1 times [2021-11-19 15:44:51,357 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:44:51,357 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [506274347] [2021-11-19 15:44:51,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:44:51,357 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:44:51,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:44:51,602 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:44:51,603 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:44:51,603 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [506274347] [2021-11-19 15:44:51,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [506274347] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 15:44:51,603 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 15:44:51,604 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-19 15:44:51,604 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1552129964] [2021-11-19 15:44:51,604 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:44:51,604 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-19 15:44:51,605 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:44:51,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-19 15:44:51,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-11-19 15:44:51,605 INFO L87 Difference]: Start difference. First operand 4294 states and 6034 transitions. Second operand has 8 states, 8 states have (on average 9.875) internal successors, (79), 8 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:52,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:44:52,265 INFO L93 Difference]: Finished difference Result 8546 states and 12025 transitions. [2021-11-19 15:44:52,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-19 15:44:52,266 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 9.875) internal successors, (79), 8 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 79 [2021-11-19 15:44:52,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:44:52,289 INFO L225 Difference]: With dead ends: 8546 [2021-11-19 15:44:52,289 INFO L226 Difference]: Without dead ends: 4296 [2021-11-19 15:44:52,296 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=50, Invalid=82, Unknown=0, NotChecked=0, Total=132 [2021-11-19 15:44:52,296 INFO L933 BasicCegarLoop]: 94 mSDtfsCounter, 400 mSDsluCounter, 324 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 400 SdHoareTripleChecker+Valid, 418 SdHoareTripleChecker+Invalid, 117 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 15:44:52,297 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [400 Valid, 418 Invalid, 117 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 15:44:52,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4296 states. [2021-11-19 15:44:52,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4296 to 4294. [2021-11-19 15:44:52,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4294 states, 4293 states have (on average 1.4050780340088516) internal successors, (6032), 4293 states have internal predecessors, (6032), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:52,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4294 states to 4294 states and 6032 transitions. [2021-11-19 15:44:52,757 INFO L78 Accepts]: Start accepts. Automaton has 4294 states and 6032 transitions. Word has length 79 [2021-11-19 15:44:52,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:44:52,757 INFO L470 AbstractCegarLoop]: Abstraction has 4294 states and 6032 transitions. [2021-11-19 15:44:52,758 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 9.875) internal successors, (79), 8 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:52,758 INFO L276 IsEmpty]: Start isEmpty. Operand 4294 states and 6032 transitions. [2021-11-19 15:44:52,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-19 15:44:52,759 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:44:52,759 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:44:52,759 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-19 15:44:52,760 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:44:52,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:44:52,760 INFO L85 PathProgramCache]: Analyzing trace with hash -352746222, now seen corresponding path program 1 times [2021-11-19 15:44:52,760 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:44:52,761 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1864718330] [2021-11-19 15:44:52,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:44:52,761 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:44:52,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:44:52,833 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:44:52,833 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:44:52,834 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1864718330] [2021-11-19 15:44:52,834 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1864718330] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 15:44:52,834 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 15:44:52,834 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-19 15:44:52,835 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562465733] [2021-11-19 15:44:52,835 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:44:52,835 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-19 15:44:52,835 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:44:52,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-19 15:44:52,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-19 15:44:52,836 INFO L87 Difference]: Start difference. First operand 4294 states and 6032 transitions. Second operand has 5 states, 5 states have (on average 16.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:53,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:44:53,371 INFO L93 Difference]: Finished difference Result 8544 states and 12020 transitions. [2021-11-19 15:44:53,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-19 15:44:53,372 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 16.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 80 [2021-11-19 15:44:53,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:44:53,395 INFO L225 Difference]: With dead ends: 8544 [2021-11-19 15:44:53,395 INFO L226 Difference]: Without dead ends: 4294 [2021-11-19 15:44:53,402 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-19 15:44:53,403 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 242 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 242 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 15:44:53,404 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [242 Valid, 82 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 15:44:53,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4294 states. [2021-11-19 15:44:53,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4294 to 4294. [2021-11-19 15:44:53,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4294 states, 4293 states have (on average 1.3901700442580947) internal successors, (5968), 4293 states have internal predecessors, (5968), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:53,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4294 states to 4294 states and 5968 transitions. [2021-11-19 15:44:53,852 INFO L78 Accepts]: Start accepts. Automaton has 4294 states and 5968 transitions. Word has length 80 [2021-11-19 15:44:53,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:44:53,853 INFO L470 AbstractCegarLoop]: Abstraction has 4294 states and 5968 transitions. [2021-11-19 15:44:53,853 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 16.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:53,853 INFO L276 IsEmpty]: Start isEmpty. Operand 4294 states and 5968 transitions. [2021-11-19 15:44:53,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-19 15:44:53,854 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:44:53,854 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:44:53,854 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-19 15:44:53,855 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:44:53,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:44:53,855 INFO L85 PathProgramCache]: Analyzing trace with hash -1115609929, now seen corresponding path program 1 times [2021-11-19 15:44:53,855 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:44:53,855 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1357418426] [2021-11-19 15:44:53,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:44:53,856 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:44:53,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:44:53,916 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:44:53,916 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:44:53,916 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1357418426] [2021-11-19 15:44:53,917 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1357418426] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 15:44:53,917 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 15:44:53,917 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-19 15:44:53,917 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325776650] [2021-11-19 15:44:53,917 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:44:53,918 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-19 15:44:53,918 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:44:53,918 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-19 15:44:53,918 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-19 15:44:53,919 INFO L87 Difference]: Start difference. First operand 4294 states and 5968 transitions. Second operand has 5 states, 5 states have (on average 16.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:54,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:44:54,417 INFO L93 Difference]: Finished difference Result 8546 states and 11893 transitions. [2021-11-19 15:44:54,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-19 15:44:54,418 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 16.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 80 [2021-11-19 15:44:54,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:44:54,448 INFO L225 Difference]: With dead ends: 8546 [2021-11-19 15:44:54,455 INFO L226 Difference]: Without dead ends: 4296 [2021-11-19 15:44:54,463 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-19 15:44:54,464 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 378 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 378 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 15:44:54,465 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [378 Valid, 96 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 15:44:54,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4296 states. [2021-11-19 15:44:54,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4296 to 4294. [2021-11-19 15:44:54,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4294 states, 4293 states have (on average 1.3752620545073375) internal successors, (5904), 4293 states have internal predecessors, (5904), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:54,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4294 states to 4294 states and 5904 transitions. [2021-11-19 15:44:54,908 INFO L78 Accepts]: Start accepts. Automaton has 4294 states and 5904 transitions. Word has length 80 [2021-11-19 15:44:54,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:44:54,908 INFO L470 AbstractCegarLoop]: Abstraction has 4294 states and 5904 transitions. [2021-11-19 15:44:54,909 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 16.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:54,909 INFO L276 IsEmpty]: Start isEmpty. Operand 4294 states and 5904 transitions. [2021-11-19 15:44:54,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-19 15:44:54,910 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:44:54,910 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:44:54,910 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-19 15:44:54,910 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:44:54,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:44:54,911 INFO L85 PathProgramCache]: Analyzing trace with hash 1437940252, now seen corresponding path program 1 times [2021-11-19 15:44:54,911 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:44:54,911 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1154506815] [2021-11-19 15:44:54,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:44:54,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:44:54,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:44:54,990 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:44:54,991 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:44:54,991 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1154506815] [2021-11-19 15:44:54,991 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1154506815] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 15:44:54,991 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 15:44:54,991 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-19 15:44:54,992 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786732928] [2021-11-19 15:44:54,992 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:44:54,992 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-19 15:44:54,992 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:44:54,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-19 15:44:54,993 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-19 15:44:54,993 INFO L87 Difference]: Start difference. First operand 4294 states and 5904 transitions. Second operand has 5 states, 5 states have (on average 16.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:55,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:44:55,588 INFO L93 Difference]: Finished difference Result 8544 states and 11764 transitions. [2021-11-19 15:44:55,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-19 15:44:55,589 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 16.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 80 [2021-11-19 15:44:55,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:44:55,600 INFO L225 Difference]: With dead ends: 8544 [2021-11-19 15:44:55,600 INFO L226 Difference]: Without dead ends: 4294 [2021-11-19 15:44:55,607 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-19 15:44:55,608 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 213 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 15:44:55,608 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [213 Valid, 98 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-19 15:44:55,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4294 states. [2021-11-19 15:44:56,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4294 to 4294. [2021-11-19 15:44:56,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4294 states, 4293 states have (on average 1.3631493128348475) internal successors, (5852), 4293 states have internal predecessors, (5852), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:56,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4294 states to 4294 states and 5852 transitions. [2021-11-19 15:44:56,189 INFO L78 Accepts]: Start accepts. Automaton has 4294 states and 5852 transitions. Word has length 80 [2021-11-19 15:44:56,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:44:56,190 INFO L470 AbstractCegarLoop]: Abstraction has 4294 states and 5852 transitions. [2021-11-19 15:44:56,191 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 16.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:56,191 INFO L276 IsEmpty]: Start isEmpty. Operand 4294 states and 5852 transitions. [2021-11-19 15:44:56,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-19 15:44:56,193 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:44:56,193 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:44:56,194 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-19 15:44:56,194 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:44:56,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:44:56,194 INFO L85 PathProgramCache]: Analyzing trace with hash -1991494655, now seen corresponding path program 1 times [2021-11-19 15:44:56,195 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:44:56,195 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [853598084] [2021-11-19 15:44:56,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:44:56,195 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:44:56,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:44:56,330 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:44:56,331 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:44:56,331 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [853598084] [2021-11-19 15:44:56,331 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [853598084] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 15:44:56,331 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 15:44:56,331 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-19 15:44:56,332 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989962178] [2021-11-19 15:44:56,332 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 15:44:56,332 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-19 15:44:56,332 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 15:44:56,333 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-19 15:44:56,333 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-19 15:44:56,333 INFO L87 Difference]: Start difference. First operand 4294 states and 5852 transitions. Second operand has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:57,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 15:44:57,102 INFO L93 Difference]: Finished difference Result 5843 states and 7899 transitions. [2021-11-19 15:44:57,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-19 15:44:57,103 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 80 [2021-11-19 15:44:57,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 15:44:57,116 INFO L225 Difference]: With dead ends: 5843 [2021-11-19 15:44:57,116 INFO L226 Difference]: Without dead ends: 5841 [2021-11-19 15:44:57,119 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-19 15:44:57,120 INFO L933 BasicCegarLoop]: 190 mSDtfsCounter, 149 mSDsluCounter, 418 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 578 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-19 15:44:57,120 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [149 Valid, 578 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-19 15:44:57,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5841 states. [2021-11-19 15:44:57,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5841 to 4294. [2021-11-19 15:44:57,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4294 states, 4293 states have (on average 1.3556953179594688) internal successors, (5820), 4293 states have internal predecessors, (5820), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:57,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4294 states to 4294 states and 5820 transitions. [2021-11-19 15:44:57,646 INFO L78 Accepts]: Start accepts. Automaton has 4294 states and 5820 transitions. Word has length 80 [2021-11-19 15:44:57,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 15:44:57,647 INFO L470 AbstractCegarLoop]: Abstraction has 4294 states and 5820 transitions. [2021-11-19 15:44:57,647 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-19 15:44:57,647 INFO L276 IsEmpty]: Start isEmpty. Operand 4294 states and 5820 transitions. [2021-11-19 15:44:57,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-19 15:44:57,649 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 15:44:57,649 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 15:44:57,649 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-19 15:44:57,650 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 15:44:57,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 15:44:57,650 INFO L85 PathProgramCache]: Analyzing trace with hash 317313593, now seen corresponding path program 1 times [2021-11-19 15:44:57,650 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 15:44:57,651 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1195300085] [2021-11-19 15:44:57,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:44:57,651 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 15:44:57,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:45:07,745 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:45:07,745 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 15:45:07,746 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1195300085] [2021-11-19 15:45:07,746 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1195300085] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 15:45:07,746 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [964511150] [2021-11-19 15:45:07,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 15:45:07,747 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 15:45:07,747 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ea7b072-ea85-4cd6-b5b1-4a689c1fcd42/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 15:45:07,758 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ea7b072-ea85-4cd6-b5b1-4a689c1fcd42/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 15:45:07,765 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ea7b072-ea85-4cd6-b5b1-4a689c1fcd42/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-19 15:45:08,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 15:45:08,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 427 conjuncts, 93 conjunts are in the unsatisfiable core [2021-11-19 15:45:08,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 15:47:14,222 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 15:47:14,223 INFO L328 TraceCheckSpWp]: Computing backward predicates...