./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/eca-rers2012/Problem03_label51.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem03_label51.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 74edf29578da59b17de672f50e10ed8f88a3850b8ffae9884ae020db50745360 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:14:20,417 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:14:20,419 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:14:20,451 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:14:20,452 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:14:20,454 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:14:20,456 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:14:20,458 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:14:20,460 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:14:20,462 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:14:20,463 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:14:20,465 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:14:20,465 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:14:20,467 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:14:20,468 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:14:20,470 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:14:20,472 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:14:20,473 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:14:20,475 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:14:20,478 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:14:20,480 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:14:20,482 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:14:20,484 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:14:20,485 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:14:20,489 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:14:20,490 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:14:20,490 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:14:20,491 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:14:20,492 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:14:20,493 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:14:20,494 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:14:20,495 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:14:20,496 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:14:20,497 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:14:20,498 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:14:20,499 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:14:20,500 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:14:20,500 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:14:20,501 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:14:20,502 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:14:20,503 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:14:20,504 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:14:20,529 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:14:20,530 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:14:20,530 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:14:20,531 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:14:20,531 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:14:20,532 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:14:20,532 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:14:20,533 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:14:20,533 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:14:20,533 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:14:20,534 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:14:20,534 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:14:20,535 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:14:20,535 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:14:20,535 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:14:20,536 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:14:20,536 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:14:20,537 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:14:20,537 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:14:20,538 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:14:20,538 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:14:20,539 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:14:20,539 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:14:20,539 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:14:20,540 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:14:20,540 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:14:20,540 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:14:20,541 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:14:20,541 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:14:20,542 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:14:20,542 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:14:20,542 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:14:20,543 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:14:20,543 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:14:20,544 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:14:20,544 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:14:20,544 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:14:20,545 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:14:20,545 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:14:20,545 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:14:20,546 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:14:20,546 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_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 74edf29578da59b17de672f50e10ed8f88a3850b8ffae9884ae020db50745360 [2021-11-23 02:14:20,775 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:14:20,796 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:14:20,799 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:14:20,800 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:14:20,801 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:14:20,803 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/eca-rers2012/Problem03_label51.c [2021-11-23 02:14:20,902 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/data/889c69a00/9a4cb7aa9fd242e5aa83c267c8b37565/FLAG360e27d7d [2021-11-23 02:14:21,654 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:14:21,655 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/sv-benchmarks/c/eca-rers2012/Problem03_label51.c [2021-11-23 02:14:21,680 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/data/889c69a00/9a4cb7aa9fd242e5aa83c267c8b37565/FLAG360e27d7d [2021-11-23 02:14:21,796 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/data/889c69a00/9a4cb7aa9fd242e5aa83c267c8b37565 [2021-11-23 02:14:21,803 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:14:21,805 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:14:21,810 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:14:21,811 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:14:21,814 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:14:21,816 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:14:21" (1/1) ... [2021-11-23 02:14:21,818 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@723f0b20 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:14:21, skipping insertion in model container [2021-11-23 02:14:21,818 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:14:21" (1/1) ... [2021-11-23 02:14:21,825 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:14:21,896 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:14:22,668 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_42f267dc-625d-4ea5-9f50-982db57d2599/sv-benchmarks/c/eca-rers2012/Problem03_label51.c[59610,59623] [2021-11-23 02:14:22,706 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:14:22,717 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:14:22,991 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_42f267dc-625d-4ea5-9f50-982db57d2599/sv-benchmarks/c/eca-rers2012/Problem03_label51.c[59610,59623] [2021-11-23 02:14:23,032 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:14:23,052 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:14:23,052 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:14:23 WrapperNode [2021-11-23 02:14:23,053 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:14:23,054 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:14:23,054 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:14:23,054 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:14:23,062 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:14:23" (1/1) ... [2021-11-23 02:14:23,108 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:14:23" (1/1) ... [2021-11-23 02:14:23,228 INFO L137 Inliner]: procedures = 14, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 1771 [2021-11-23 02:14:23,228 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:14:23,229 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:14:23,229 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:14:23,230 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:14:23,238 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:14:23" (1/1) ... [2021-11-23 02:14:23,239 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:14:23" (1/1) ... [2021-11-23 02:14:23,246 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:14:23" (1/1) ... [2021-11-23 02:14:23,246 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:14:23" (1/1) ... [2021-11-23 02:14:23,301 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:14:23" (1/1) ... [2021-11-23 02:14:23,326 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:14:23" (1/1) ... [2021-11-23 02:14:23,336 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:14:23" (1/1) ... [2021-11-23 02:14:23,347 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:14:23,348 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:14:23,348 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:14:23,348 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:14:23,349 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:14:23" (1/1) ... [2021-11-23 02:14:23,357 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:14:23,368 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:14:23,381 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:14:23,387 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:14:23,430 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:14:23,430 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:14:23,431 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:14:23,431 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:14:23,542 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:14:23,544 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:14:25,409 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:14:25,694 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:14:25,694 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 02:14:25,698 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:14:25 BoogieIcfgContainer [2021-11-23 02:14:25,698 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:14:25,702 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:14:25,703 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:14:25,706 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:14:25,706 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:14:21" (1/3) ... [2021-11-23 02:14:25,708 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d63b229 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:14:25, skipping insertion in model container [2021-11-23 02:14:25,708 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:14:23" (2/3) ... [2021-11-23 02:14:25,709 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d63b229 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:14:25, skipping insertion in model container [2021-11-23 02:14:25,709 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:14:25" (3/3) ... [2021-11-23 02:14:25,710 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem03_label51.c [2021-11-23 02:14:25,716 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:14:25,716 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:14:25,783 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:14:25,792 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 02:14:25,792 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:14:25,823 INFO L276 IsEmpty]: Start isEmpty. Operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 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) [2021-11-23 02:14:25,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-23 02:14:25,843 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:25,844 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:25,845 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:14:25,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:25,851 INFO L85 PathProgramCache]: Analyzing trace with hash 209351162, now seen corresponding path program 1 times [2021-11-23 02:14:25,860 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:14:25,860 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1011424775] [2021-11-23 02:14:25,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:25,862 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:14:26,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:26,544 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:14:26,544 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:14:26,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1011424775] [2021-11-23 02:14:26,545 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1011424775] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:14:26,546 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:14:26,546 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:14:26,548 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1214732858] [2021-11-23 02:14:26,549 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:14:26,554 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:14:26,554 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:14:26,593 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:14:26,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:14:26,599 INFO L87 Difference]: Start difference. First operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 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 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 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) [2021-11-23 02:14:27,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:27,657 INFO L93 Difference]: Finished difference Result 440 states and 860 transitions. [2021-11-23 02:14:27,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:14:27,660 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 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 143 [2021-11-23 02:14:27,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:27,674 INFO L225 Difference]: With dead ends: 440 [2021-11-23 02:14:27,675 INFO L226 Difference]: Without dead ends: 289 [2021-11-23 02:14:27,679 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:14:27,682 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 12 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 462 mSolverCounterSat, 162 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 624 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 162 IncrementalHoareTripleChecker+Valid, 462 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:27,684 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 37 Invalid, 624 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [162 Valid, 462 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 02:14:27,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2021-11-23 02:14:27,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 289. [2021-11-23 02:14:27,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 288 states have (on average 1.8576388888888888) internal successors, (535), 288 states have internal predecessors, (535), 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) [2021-11-23 02:14:27,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 535 transitions. [2021-11-23 02:14:27,752 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 535 transitions. Word has length 143 [2021-11-23 02:14:27,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:27,753 INFO L470 AbstractCegarLoop]: Abstraction has 289 states and 535 transitions. [2021-11-23 02:14:27,754 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 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) [2021-11-23 02:14:27,754 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 535 transitions. [2021-11-23 02:14:27,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-23 02:14:27,759 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:27,759 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:27,760 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:14:27,760 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:14:27,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:27,761 INFO L85 PathProgramCache]: Analyzing trace with hash 874743070, now seen corresponding path program 1 times [2021-11-23 02:14:27,762 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:14:27,762 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1175089351] [2021-11-23 02:14:27,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:27,763 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:14:27,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:27,898 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:14:27,898 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:14:27,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1175089351] [2021-11-23 02:14:27,899 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1175089351] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:14:27,899 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:14:27,900 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:14:27,900 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1030657916] [2021-11-23 02:14:27,900 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:14:27,902 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:14:27,902 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:14:27,903 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:14:27,903 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:14:27,904 INFO L87 Difference]: Start difference. First operand 289 states and 535 transitions. Second operand has 3 states, 3 states have (on average 49.666666666666664) internal successors, (149), 2 states have internal predecessors, (149), 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) [2021-11-23 02:14:28,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:28,732 INFO L93 Difference]: Finished difference Result 863 states and 1602 transitions. [2021-11-23 02:14:28,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:14:28,733 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 49.666666666666664) internal successors, (149), 2 states have internal predecessors, (149), 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 149 [2021-11-23 02:14:28,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:28,738 INFO L225 Difference]: With dead ends: 863 [2021-11-23 02:14:28,738 INFO L226 Difference]: Without dead ends: 575 [2021-11-23 02:14:28,741 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:14:28,743 INFO L933 BasicCegarLoop]: 92 mSDtfsCounter, 152 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 451 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 574 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 451 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:28,743 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [152 Valid, 95 Invalid, 574 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 451 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 02:14:28,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2021-11-23 02:14:28,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 575. [2021-11-23 02:14:28,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 575 states, 574 states have (on average 1.5452961672473868) internal successors, (887), 574 states have internal predecessors, (887), 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) [2021-11-23 02:14:28,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 575 states to 575 states and 887 transitions. [2021-11-23 02:14:28,803 INFO L78 Accepts]: Start accepts. Automaton has 575 states and 887 transitions. Word has length 149 [2021-11-23 02:14:28,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:28,804 INFO L470 AbstractCegarLoop]: Abstraction has 575 states and 887 transitions. [2021-11-23 02:14:28,804 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 49.666666666666664) internal successors, (149), 2 states have internal predecessors, (149), 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) [2021-11-23 02:14:28,804 INFO L276 IsEmpty]: Start isEmpty. Operand 575 states and 887 transitions. [2021-11-23 02:14:28,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-11-23 02:14:28,811 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:28,812 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:28,812 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 02:14:28,813 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:14:28,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:28,814 INFO L85 PathProgramCache]: Analyzing trace with hash -1988457904, now seen corresponding path program 1 times [2021-11-23 02:14:28,814 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:14:28,814 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1059512742] [2021-11-23 02:14:28,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:28,815 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:14:28,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:28,902 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:14:28,902 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:14:28,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1059512742] [2021-11-23 02:14:28,903 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1059512742] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:14:28,903 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:14:28,903 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:14:28,903 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1934012636] [2021-11-23 02:14:28,904 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:14:28,904 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:14:28,904 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:14:28,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:14:28,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:14:28,906 INFO L87 Difference]: Start difference. First operand 575 states and 887 transitions. Second operand has 3 states, 3 states have (on average 52.0) internal successors, (156), 2 states have internal predecessors, (156), 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) [2021-11-23 02:14:29,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:29,692 INFO L93 Difference]: Finished difference Result 1721 states and 2658 transitions. [2021-11-23 02:14:29,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:14:29,694 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 52.0) internal successors, (156), 2 states have internal predecessors, (156), 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 156 [2021-11-23 02:14:29,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:29,701 INFO L225 Difference]: With dead ends: 1721 [2021-11-23 02:14:29,701 INFO L226 Difference]: Without dead ends: 1147 [2021-11-23 02:14:29,704 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:14:29,705 INFO L933 BasicCegarLoop]: 101 mSDtfsCounter, 156 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 523 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 156 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 605 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 523 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:29,706 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [156 Valid, 105 Invalid, 605 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 523 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 02:14:29,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1147 states. [2021-11-23 02:14:29,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1147 to 1147. [2021-11-23 02:14:29,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1147 states, 1146 states have (on average 1.4616055846422338) internal successors, (1675), 1146 states have internal predecessors, (1675), 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) [2021-11-23 02:14:29,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1147 states to 1147 states and 1675 transitions. [2021-11-23 02:14:29,771 INFO L78 Accepts]: Start accepts. Automaton has 1147 states and 1675 transitions. Word has length 156 [2021-11-23 02:14:29,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:29,772 INFO L470 AbstractCegarLoop]: Abstraction has 1147 states and 1675 transitions. [2021-11-23 02:14:29,772 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 52.0) internal successors, (156), 2 states have internal predecessors, (156), 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) [2021-11-23 02:14:29,773 INFO L276 IsEmpty]: Start isEmpty. Operand 1147 states and 1675 transitions. [2021-11-23 02:14:29,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-11-23 02:14:29,780 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:29,780 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:29,780 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 02:14:29,781 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:14:29,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:29,781 INFO L85 PathProgramCache]: Analyzing trace with hash 836236925, now seen corresponding path program 1 times [2021-11-23 02:14:29,782 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:14:29,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [157979375] [2021-11-23 02:14:29,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:29,783 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:14:29,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:29,876 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:14:29,877 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:14:29,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [157979375] [2021-11-23 02:14:29,877 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [157979375] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:14:29,878 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:14:29,878 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:14:29,878 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575749515] [2021-11-23 02:14:29,879 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:14:29,880 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:14:29,880 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:14:29,881 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:14:29,881 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:14:29,882 INFO L87 Difference]: Start difference. First operand 1147 states and 1675 transitions. Second operand has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 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) [2021-11-23 02:14:30,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:30,718 INFO L93 Difference]: Finished difference Result 3437 states and 5022 transitions. [2021-11-23 02:14:30,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:14:30,719 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 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) Word has length 157 [2021-11-23 02:14:30,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:30,735 INFO L225 Difference]: With dead ends: 3437 [2021-11-23 02:14:30,736 INFO L226 Difference]: Without dead ends: 2291 [2021-11-23 02:14:30,738 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:14:30,740 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 159 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 452 mSolverCounterSat, 170 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 622 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 170 IncrementalHoareTripleChecker+Valid, 452 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:30,741 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [159 Valid, 23 Invalid, 622 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [170 Valid, 452 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 02:14:30,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2291 states. [2021-11-23 02:14:30,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2291 to 2291. [2021-11-23 02:14:30,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2291 states, 2290 states have (on average 1.4266375545851528) internal successors, (3267), 2290 states have internal predecessors, (3267), 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) [2021-11-23 02:14:30,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2291 states to 2291 states and 3267 transitions. [2021-11-23 02:14:30,815 INFO L78 Accepts]: Start accepts. Automaton has 2291 states and 3267 transitions. Word has length 157 [2021-11-23 02:14:30,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:30,815 INFO L470 AbstractCegarLoop]: Abstraction has 2291 states and 3267 transitions. [2021-11-23 02:14:30,816 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 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) [2021-11-23 02:14:30,816 INFO L276 IsEmpty]: Start isEmpty. Operand 2291 states and 3267 transitions. [2021-11-23 02:14:30,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-23 02:14:30,823 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:30,823 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:30,823 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 02:14:30,823 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:14:30,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:30,824 INFO L85 PathProgramCache]: Analyzing trace with hash 303772738, now seen corresponding path program 1 times [2021-11-23 02:14:30,824 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:14:30,825 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2027820430] [2021-11-23 02:14:30,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:30,825 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:14:30,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:30,901 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 31 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:14:30,901 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:14:30,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2027820430] [2021-11-23 02:14:30,902 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2027820430] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:14:30,902 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:14:30,902 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:14:30,902 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037842651] [2021-11-23 02:14:30,903 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:14:30,903 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:14:30,903 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:14:30,904 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:14:30,904 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:14:30,904 INFO L87 Difference]: Start difference. First operand 2291 states and 3267 transitions. Second operand has 3 states, 3 states have (on average 53.0) internal successors, (159), 3 states have internal predecessors, (159), 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) [2021-11-23 02:14:31,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:31,787 INFO L93 Difference]: Finished difference Result 5725 states and 8442 transitions. [2021-11-23 02:14:31,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:14:31,788 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 53.0) internal successors, (159), 3 states have internal predecessors, (159), 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 164 [2021-11-23 02:14:31,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:31,813 INFO L225 Difference]: With dead ends: 5725 [2021-11-23 02:14:31,813 INFO L226 Difference]: Without dead ends: 3435 [2021-11-23 02:14:31,817 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:14:31,823 INFO L933 BasicCegarLoop]: 253 mSDtfsCounter, 150 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 407 mSolverCounterSat, 163 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 257 SdHoareTripleChecker+Invalid, 570 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 163 IncrementalHoareTripleChecker+Valid, 407 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:31,827 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [150 Valid, 257 Invalid, 570 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [163 Valid, 407 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 02:14:31,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3435 states. [2021-11-23 02:14:31,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3435 to 3435. [2021-11-23 02:14:31,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3435 states, 3434 states have (on average 1.3491555037856726) internal successors, (4633), 3434 states have internal predecessors, (4633), 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) [2021-11-23 02:14:31,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3435 states to 3435 states and 4633 transitions. [2021-11-23 02:14:31,949 INFO L78 Accepts]: Start accepts. Automaton has 3435 states and 4633 transitions. Word has length 164 [2021-11-23 02:14:31,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:31,950 INFO L470 AbstractCegarLoop]: Abstraction has 3435 states and 4633 transitions. [2021-11-23 02:14:31,950 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 53.0) internal successors, (159), 3 states have internal predecessors, (159), 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) [2021-11-23 02:14:31,951 INFO L276 IsEmpty]: Start isEmpty. Operand 3435 states and 4633 transitions. [2021-11-23 02:14:31,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2021-11-23 02:14:31,966 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:31,967 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:31,967 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 02:14:31,967 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:14:31,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:31,968 INFO L85 PathProgramCache]: Analyzing trace with hash 267011531, now seen corresponding path program 1 times [2021-11-23 02:14:31,969 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:14:31,969 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [213184373] [2021-11-23 02:14:31,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:31,970 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:14:32,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:32,095 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:14:32,095 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:14:32,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [213184373] [2021-11-23 02:14:32,096 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [213184373] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:14:32,096 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:14:32,096 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:14:32,096 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852852501] [2021-11-23 02:14:32,097 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:14:32,097 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:14:32,097 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:14:32,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:14:32,099 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:14:32,099 INFO L87 Difference]: Start difference. First operand 3435 states and 4633 transitions. Second operand has 3 states, 3 states have (on average 63.333333333333336) internal successors, (190), 3 states have internal predecessors, (190), 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) [2021-11-23 02:14:32,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:32,992 INFO L93 Difference]: Finished difference Result 8585 states and 11537 transitions. [2021-11-23 02:14:32,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:14:32,993 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 63.333333333333336) internal successors, (190), 3 states have internal predecessors, (190), 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 195 [2021-11-23 02:14:32,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:33,027 INFO L225 Difference]: With dead ends: 8585 [2021-11-23 02:14:33,027 INFO L226 Difference]: Without dead ends: 5151 [2021-11-23 02:14:33,032 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:14:33,038 INFO L933 BasicCegarLoop]: 258 mSDtfsCounter, 109 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 448 mSolverCounterSat, 131 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 261 SdHoareTripleChecker+Invalid, 579 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 448 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:33,038 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 261 Invalid, 579 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 448 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 02:14:33,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5151 states. [2021-11-23 02:14:33,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5151 to 4865. [2021-11-23 02:14:33,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4865 states, 4864 states have (on average 1.3013980263157894) internal successors, (6330), 4864 states have internal predecessors, (6330), 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) [2021-11-23 02:14:33,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4865 states to 4865 states and 6330 transitions. [2021-11-23 02:14:33,181 INFO L78 Accepts]: Start accepts. Automaton has 4865 states and 6330 transitions. Word has length 195 [2021-11-23 02:14:33,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:33,181 INFO L470 AbstractCegarLoop]: Abstraction has 4865 states and 6330 transitions. [2021-11-23 02:14:33,181 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 63.333333333333336) internal successors, (190), 3 states have internal predecessors, (190), 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) [2021-11-23 02:14:33,182 INFO L276 IsEmpty]: Start isEmpty. Operand 4865 states and 6330 transitions. [2021-11-23 02:14:33,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2021-11-23 02:14:33,194 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:33,194 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:33,194 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 02:14:33,195 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:14:33,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:33,196 INFO L85 PathProgramCache]: Analyzing trace with hash 1365194629, now seen corresponding path program 1 times [2021-11-23 02:14:33,196 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:14:33,196 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1065288953] [2021-11-23 02:14:33,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:33,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:14:33,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:33,313 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 49 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 02:14:33,314 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:14:33,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1065288953] [2021-11-23 02:14:33,314 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1065288953] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:14:33,314 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:14:33,315 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:14:33,315 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [846737275] [2021-11-23 02:14:33,315 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:14:33,316 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:14:33,316 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:14:33,317 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:14:33,317 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:14:33,317 INFO L87 Difference]: Start difference. First operand 4865 states and 6330 transitions. Second operand has 3 states, 3 states have (on average 57.666666666666664) internal successors, (173), 2 states have internal predecessors, (173), 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) [2021-11-23 02:14:34,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:34,277 INFO L93 Difference]: Finished difference Result 14305 states and 18647 transitions. [2021-11-23 02:14:34,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:14:34,277 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 57.666666666666664) internal successors, (173), 2 states have internal predecessors, (173), 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 195 [2021-11-23 02:14:34,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:34,342 INFO L225 Difference]: With dead ends: 14305 [2021-11-23 02:14:34,342 INFO L226 Difference]: Without dead ends: 9441 [2021-11-23 02:14:34,350 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:14:34,354 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 135 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 538 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 624 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 538 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:34,355 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [135 Valid, 101 Invalid, 624 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 538 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 02:14:34,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9441 states. [2021-11-23 02:14:34,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9441 to 9441. [2021-11-23 02:14:34,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9441 states, 9440 states have (on average 1.2734110169491526) internal successors, (12021), 9440 states have internal predecessors, (12021), 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) [2021-11-23 02:14:34,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9441 states to 9441 states and 12021 transitions. [2021-11-23 02:14:34,673 INFO L78 Accepts]: Start accepts. Automaton has 9441 states and 12021 transitions. Word has length 195 [2021-11-23 02:14:34,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:34,674 INFO L470 AbstractCegarLoop]: Abstraction has 9441 states and 12021 transitions. [2021-11-23 02:14:34,675 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 57.666666666666664) internal successors, (173), 2 states have internal predecessors, (173), 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) [2021-11-23 02:14:34,675 INFO L276 IsEmpty]: Start isEmpty. Operand 9441 states and 12021 transitions. [2021-11-23 02:14:34,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2021-11-23 02:14:34,726 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:34,727 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:34,728 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 02:14:34,728 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:14:34,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:34,729 INFO L85 PathProgramCache]: Analyzing trace with hash 1454165746, now seen corresponding path program 1 times [2021-11-23 02:14:34,729 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:14:34,730 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1580588758] [2021-11-23 02:14:34,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:34,730 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:14:34,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:34,841 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 62 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 02:14:34,841 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:14:34,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1580588758] [2021-11-23 02:14:34,841 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1580588758] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:14:34,842 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:14:34,842 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:14:34,842 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726614030] [2021-11-23 02:14:34,842 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:14:34,842 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:14:34,843 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:14:34,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:14:34,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:14:34,844 INFO L87 Difference]: Start difference. First operand 9441 states and 12021 transitions. Second operand has 3 states, 3 states have (on average 59.333333333333336) internal successors, (178), 2 states have internal predecessors, (178), 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) [2021-11-23 02:14:35,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:35,598 INFO L93 Difference]: Finished difference Result 19882 states and 25205 transitions. [2021-11-23 02:14:35,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:14:35,599 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 59.333333333333336) internal successors, (178), 2 states have internal predecessors, (178), 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 207 [2021-11-23 02:14:35,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:35,654 INFO L225 Difference]: With dead ends: 19882 [2021-11-23 02:14:35,657 INFO L226 Difference]: Without dead ends: 10442 [2021-11-23 02:14:35,668 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:14:35,670 INFO L933 BasicCegarLoop]: 104 mSDtfsCounter, 114 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 484 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 485 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 484 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:35,670 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [114 Valid, 108 Invalid, 485 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 484 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:14:35,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10442 states. [2021-11-23 02:14:35,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10442 to 10442. [2021-11-23 02:14:35,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10442 states, 10441 states have (on average 1.2621396417967627) internal successors, (13178), 10441 states have internal predecessors, (13178), 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) [2021-11-23 02:14:35,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10442 states to 10442 states and 13178 transitions. [2021-11-23 02:14:35,983 INFO L78 Accepts]: Start accepts. Automaton has 10442 states and 13178 transitions. Word has length 207 [2021-11-23 02:14:35,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:35,986 INFO L470 AbstractCegarLoop]: Abstraction has 10442 states and 13178 transitions. [2021-11-23 02:14:35,987 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 59.333333333333336) internal successors, (178), 2 states have internal predecessors, (178), 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) [2021-11-23 02:14:35,987 INFO L276 IsEmpty]: Start isEmpty. Operand 10442 states and 13178 transitions. [2021-11-23 02:14:36,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2021-11-23 02:14:36,009 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:36,010 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:36,010 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-23 02:14:36,010 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:14:36,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:36,011 INFO L85 PathProgramCache]: Analyzing trace with hash 1500894629, now seen corresponding path program 1 times [2021-11-23 02:14:36,011 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:14:36,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1406394660] [2021-11-23 02:14:36,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:36,012 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:14:36,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:36,114 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 62 proven. 0 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-23 02:14:36,115 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:14:36,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1406394660] [2021-11-23 02:14:36,115 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1406394660] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:14:36,115 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:14:36,116 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:14:36,116 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [634548556] [2021-11-23 02:14:36,116 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:14:36,117 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:14:36,117 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:14:36,118 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:14:36,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:14:36,119 INFO L87 Difference]: Start difference. First operand 10442 states and 13178 transitions. Second operand has 4 states, 4 states have (on average 41.0) internal successors, (164), 3 states have internal predecessors, (164), 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) [2021-11-23 02:14:37,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:37,162 INFO L93 Difference]: Finished difference Result 22599 states and 28821 transitions. [2021-11-23 02:14:37,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:14:37,162 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 41.0) internal successors, (164), 3 states have internal predecessors, (164), 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 209 [2021-11-23 02:14:37,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:37,187 INFO L225 Difference]: With dead ends: 22599 [2021-11-23 02:14:37,187 INFO L226 Difference]: Without dead ends: 12444 [2021-11-23 02:14:37,199 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:14:37,201 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 391 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 651 mSolverCounterSat, 214 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 391 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 865 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 214 IncrementalHoareTripleChecker+Valid, 651 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:37,202 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [391 Valid, 10 Invalid, 865 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [214 Valid, 651 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 02:14:37,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12444 states. [2021-11-23 02:14:37,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12444 to 12444. [2021-11-23 02:14:37,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12444 states, 12443 states have (on average 1.216426906694527) internal successors, (15136), 12443 states have internal predecessors, (15136), 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) [2021-11-23 02:14:37,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12444 states to 12444 states and 15136 transitions. [2021-11-23 02:14:37,477 INFO L78 Accepts]: Start accepts. Automaton has 12444 states and 15136 transitions. Word has length 209 [2021-11-23 02:14:37,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:37,477 INFO L470 AbstractCegarLoop]: Abstraction has 12444 states and 15136 transitions. [2021-11-23 02:14:37,477 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 41.0) internal successors, (164), 3 states have internal predecessors, (164), 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) [2021-11-23 02:14:37,477 INFO L276 IsEmpty]: Start isEmpty. Operand 12444 states and 15136 transitions. [2021-11-23 02:14:37,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 218 [2021-11-23 02:14:37,578 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:37,579 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:37,579 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-23 02:14:37,579 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:14:37,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:37,580 INFO L85 PathProgramCache]: Analyzing trace with hash 525268486, now seen corresponding path program 1 times [2021-11-23 02:14:37,584 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:14:37,585 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [815662668] [2021-11-23 02:14:37,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:37,585 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:14:37,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:37,778 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:14:37,778 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:14:37,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [815662668] [2021-11-23 02:14:37,778 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [815662668] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:14:37,779 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:14:37,779 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:14:37,779 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1121910460] [2021-11-23 02:14:37,779 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:14:37,780 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:14:37,780 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:14:37,781 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:14:37,781 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:14:37,781 INFO L87 Difference]: Start difference. First operand 12444 states and 15136 transitions. Second operand has 3 states, 3 states have (on average 72.33333333333333) internal successors, (217), 2 states have internal predecessors, (217), 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) [2021-11-23 02:14:38,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:38,472 INFO L93 Difference]: Finished difference Result 24458 states and 29789 transitions. [2021-11-23 02:14:38,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:14:38,472 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 72.33333333333333) internal successors, (217), 2 states have internal predecessors, (217), 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 217 [2021-11-23 02:14:38,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:38,495 INFO L225 Difference]: With dead ends: 24458 [2021-11-23 02:14:38,495 INFO L226 Difference]: Without dead ends: 12444 [2021-11-23 02:14:38,508 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:14:38,509 INFO L933 BasicCegarLoop]: 99 mSDtfsCounter, 72 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 440 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 441 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:38,510 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 103 Invalid, 441 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 440 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:14:38,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12444 states. [2021-11-23 02:14:38,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12444 to 12444. [2021-11-23 02:14:38,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12444 states, 12443 states have (on average 1.2161858072812022) internal successors, (15133), 12443 states have internal predecessors, (15133), 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) [2021-11-23 02:14:38,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12444 states to 12444 states and 15133 transitions. [2021-11-23 02:14:38,826 INFO L78 Accepts]: Start accepts. Automaton has 12444 states and 15133 transitions. Word has length 217 [2021-11-23 02:14:38,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:38,826 INFO L470 AbstractCegarLoop]: Abstraction has 12444 states and 15133 transitions. [2021-11-23 02:14:38,827 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 72.33333333333333) internal successors, (217), 2 states have internal predecessors, (217), 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) [2021-11-23 02:14:38,827 INFO L276 IsEmpty]: Start isEmpty. Operand 12444 states and 15133 transitions. [2021-11-23 02:14:38,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2021-11-23 02:14:38,849 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:38,849 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:38,850 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-23 02:14:38,850 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:14:38,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:38,850 INFO L85 PathProgramCache]: Analyzing trace with hash 1812785981, now seen corresponding path program 1 times [2021-11-23 02:14:38,851 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:14:38,851 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [866014835] [2021-11-23 02:14:38,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:38,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:14:38,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:39,013 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 79 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:14:39,013 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:14:39,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [866014835] [2021-11-23 02:14:39,013 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [866014835] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:14:39,014 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:14:39,014 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:14:39,014 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1197427818] [2021-11-23 02:14:39,014 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:14:39,015 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:14:39,015 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:14:39,016 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:14:39,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:14:39,017 INFO L87 Difference]: Start difference. First operand 12444 states and 15133 transitions. Second operand has 3 states, 3 states have (on average 73.0) internal successors, (219), 2 states have internal predecessors, (219), 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) [2021-11-23 02:14:39,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:39,893 INFO L93 Difference]: Finished difference Result 27606 states and 33752 transitions. [2021-11-23 02:14:39,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:14:39,893 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 73.0) internal successors, (219), 2 states have internal predecessors, (219), 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 224 [2021-11-23 02:14:39,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:39,927 INFO L225 Difference]: With dead ends: 27606 [2021-11-23 02:14:39,927 INFO L226 Difference]: Without dead ends: 15592 [2021-11-23 02:14:39,941 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:14:39,942 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 86 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 520 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 530 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 520 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:39,942 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 67 Invalid, 530 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 520 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 02:14:39,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15592 states. [2021-11-23 02:14:40,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15592 to 14589. [2021-11-23 02:14:40,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14589 states, 14588 states have (on average 1.232725527831094) internal successors, (17983), 14588 states have internal predecessors, (17983), 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) [2021-11-23 02:14:40,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14589 states to 14589 states and 17983 transitions. [2021-11-23 02:14:40,355 INFO L78 Accepts]: Start accepts. Automaton has 14589 states and 17983 transitions. Word has length 224 [2021-11-23 02:14:40,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:40,355 INFO L470 AbstractCegarLoop]: Abstraction has 14589 states and 17983 transitions. [2021-11-23 02:14:40,355 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 73.0) internal successors, (219), 2 states have internal predecessors, (219), 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) [2021-11-23 02:14:40,355 INFO L276 IsEmpty]: Start isEmpty. Operand 14589 states and 17983 transitions. [2021-11-23 02:14:40,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2021-11-23 02:14:40,377 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:40,379 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:40,379 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-23 02:14:40,379 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:14:40,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:40,380 INFO L85 PathProgramCache]: Analyzing trace with hash 1949184563, now seen corresponding path program 2 times [2021-11-23 02:14:40,380 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:14:40,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1770082929] [2021-11-23 02:14:40,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:40,380 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:14:40,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:40,471 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 87 proven. 0 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-23 02:14:40,471 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:14:40,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1770082929] [2021-11-23 02:14:40,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1770082929] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:14:40,472 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:14:40,472 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:14:40,472 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823943823] [2021-11-23 02:14:40,472 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:14:40,473 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:14:40,473 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:14:40,473 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:14:40,474 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:14:40,474 INFO L87 Difference]: Start difference. First operand 14589 states and 17983 transitions. Second operand has 3 states, 3 states have (on average 58.333333333333336) internal successors, (175), 2 states have internal predecessors, (175), 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) [2021-11-23 02:14:41,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:41,404 INFO L93 Difference]: Finished difference Result 35185 states and 43672 transitions. [2021-11-23 02:14:41,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:14:41,410 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 58.333333333333336) internal successors, (175), 2 states have internal predecessors, (175), 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 237 [2021-11-23 02:14:41,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:41,452 INFO L225 Difference]: With dead ends: 35185 [2021-11-23 02:14:41,452 INFO L226 Difference]: Without dead ends: 21026 [2021-11-23 02:14:41,468 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:14:41,469 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 130 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 550 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 565 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 550 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:41,470 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [130 Valid, 77 Invalid, 565 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 550 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 02:14:41,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21026 states. [2021-11-23 02:14:41,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21026 to 21024. [2021-11-23 02:14:41,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21024 states, 21023 states have (on average 1.2393093278789897) internal successors, (26054), 21023 states have internal predecessors, (26054), 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) [2021-11-23 02:14:41,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21024 states to 21024 states and 26054 transitions. [2021-11-23 02:14:41,956 INFO L78 Accepts]: Start accepts. Automaton has 21024 states and 26054 transitions. Word has length 237 [2021-11-23 02:14:41,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:41,956 INFO L470 AbstractCegarLoop]: Abstraction has 21024 states and 26054 transitions. [2021-11-23 02:14:41,957 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 58.333333333333336) internal successors, (175), 2 states have internal predecessors, (175), 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) [2021-11-23 02:14:41,957 INFO L276 IsEmpty]: Start isEmpty. Operand 21024 states and 26054 transitions. [2021-11-23 02:14:41,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2021-11-23 02:14:41,985 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:41,985 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:41,985 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-23 02:14:41,986 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:14:41,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:41,986 INFO L85 PathProgramCache]: Analyzing trace with hash -1336732892, now seen corresponding path program 1 times [2021-11-23 02:14:41,987 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:14:41,987 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1169270368] [2021-11-23 02:14:41,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:41,987 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:14:42,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:42,247 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 99 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:14:42,247 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:14:42,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1169270368] [2021-11-23 02:14:42,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1169270368] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:14:42,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [435673587] [2021-11-23 02:14:42,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:42,248 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:14:42,248 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:14:42,254 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:14:42,283 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:14:42,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:42,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 490 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:14:42,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:14:43,047 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 98 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:14:43,047 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:14:43,048 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [435673587] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:14:43,048 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:14:43,048 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-23 02:14:43,048 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090798458] [2021-11-23 02:14:43,049 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:14:43,049 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:14:43,049 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:14:43,050 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:14:43,050 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:14:43,050 INFO L87 Difference]: Start difference. First operand 21024 states and 26054 transitions. Second operand has 3 states, 3 states have (on average 80.0) internal successors, (240), 3 states have internal predecessors, (240), 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) [2021-11-23 02:14:44,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:44,039 INFO L93 Difference]: Finished difference Result 41189 states and 51788 transitions. [2021-11-23 02:14:44,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:14:44,040 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 80.0) internal successors, (240), 3 states have internal predecessors, (240), 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 243 [2021-11-23 02:14:44,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:44,085 INFO L225 Difference]: With dead ends: 41189 [2021-11-23 02:14:44,085 INFO L226 Difference]: Without dead ends: 20881 [2021-11-23 02:14:44,098 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 242 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:14:44,099 INFO L933 BasicCegarLoop]: 187 mSDtfsCounter, 42 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 496 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 553 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 496 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:44,099 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 191 Invalid, 553 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 496 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 02:14:44,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20881 states. [2021-11-23 02:14:44,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20881 to 20881. [2021-11-23 02:14:44,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20881 states, 20880 states have (on average 1.2546455938697318) internal successors, (26197), 20880 states have internal predecessors, (26197), 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) [2021-11-23 02:14:44,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20881 states to 20881 states and 26197 transitions. [2021-11-23 02:14:44,593 INFO L78 Accepts]: Start accepts. Automaton has 20881 states and 26197 transitions. Word has length 243 [2021-11-23 02:14:44,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:44,594 INFO L470 AbstractCegarLoop]: Abstraction has 20881 states and 26197 transitions. [2021-11-23 02:14:44,595 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 80.0) internal successors, (240), 3 states have internal predecessors, (240), 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) [2021-11-23 02:14:44,595 INFO L276 IsEmpty]: Start isEmpty. Operand 20881 states and 26197 transitions. [2021-11-23 02:14:44,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2021-11-23 02:14:44,622 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:44,622 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:44,667 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:14:44,842 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-23 02:14:44,842 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:14:44,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:44,843 INFO L85 PathProgramCache]: Analyzing trace with hash 152940995, now seen corresponding path program 1 times [2021-11-23 02:14:44,843 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:14:44,843 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [804563551] [2021-11-23 02:14:44,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:44,844 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:14:44,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:45,016 INFO L134 CoverageAnalysis]: Checked inductivity of 199 backedges. 158 proven. 0 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-11-23 02:14:45,016 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:14:45,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [804563551] [2021-11-23 02:14:45,017 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [804563551] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:14:45,017 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:14:45,017 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:14:45,017 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245623269] [2021-11-23 02:14:45,018 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:14:45,018 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:14:45,019 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:14:45,019 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:14:45,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:14:45,020 INFO L87 Difference]: Start difference. First operand 20881 states and 26197 transitions. Second operand has 4 states, 4 states have (on average 52.25) internal successors, (209), 3 states have internal predecessors, (209), 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) [2021-11-23 02:14:46,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:46,324 INFO L93 Difference]: Finished difference Result 39902 states and 50133 transitions. [2021-11-23 02:14:46,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:14:46,328 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 52.25) internal successors, (209), 3 states have internal predecessors, (209), 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 249 [2021-11-23 02:14:46,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:46,368 INFO L225 Difference]: With dead ends: 39902 [2021-11-23 02:14:46,368 INFO L226 Difference]: Without dead ends: 20881 [2021-11-23 02:14:46,380 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:14:46,381 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 252 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 777 mSolverCounterSat, 321 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 252 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 1098 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 321 IncrementalHoareTripleChecker+Valid, 777 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:46,381 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [252 Valid, 32 Invalid, 1098 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [321 Valid, 777 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-23 02:14:46,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20881 states. [2021-11-23 02:14:46,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20881 to 20309. [2021-11-23 02:14:46,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20309 states, 20308 states have (on average 1.2557612763442978) internal successors, (25502), 20308 states have internal predecessors, (25502), 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) [2021-11-23 02:14:46,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20309 states to 20309 states and 25502 transitions. [2021-11-23 02:14:46,745 INFO L78 Accepts]: Start accepts. Automaton has 20309 states and 25502 transitions. Word has length 249 [2021-11-23 02:14:46,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:46,745 INFO L470 AbstractCegarLoop]: Abstraction has 20309 states and 25502 transitions. [2021-11-23 02:14:46,746 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 52.25) internal successors, (209), 3 states have internal predecessors, (209), 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) [2021-11-23 02:14:46,746 INFO L276 IsEmpty]: Start isEmpty. Operand 20309 states and 25502 transitions. [2021-11-23 02:14:46,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 257 [2021-11-23 02:14:46,762 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:46,763 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:46,763 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-23 02:14:46,763 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:14:46,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:46,764 INFO L85 PathProgramCache]: Analyzing trace with hash -1328964088, now seen corresponding path program 1 times [2021-11-23 02:14:46,764 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:14:46,765 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [709771469] [2021-11-23 02:14:46,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:46,765 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:14:46,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:46,902 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 111 proven. 6 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2021-11-23 02:14:46,903 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:14:46,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [709771469] [2021-11-23 02:14:46,903 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [709771469] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:14:46,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1985419124] [2021-11-23 02:14:46,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:46,904 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:14:46,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:14:46,906 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:14:46,929 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:14:47,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:47,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 585 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:14:47,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:14:47,547 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 112 proven. 0 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2021-11-23 02:14:47,547 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:14:47,547 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1985419124] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:14:47,547 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:14:47,548 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-23 02:14:47,548 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294812035] [2021-11-23 02:14:47,548 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:14:47,549 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:14:47,549 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:14:47,550 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:14:47,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:14:47,550 INFO L87 Difference]: Start difference. First operand 20309 states and 25502 transitions. Second operand has 3 states, 3 states have (on average 62.666666666666664) internal successors, (188), 3 states have internal predecessors, (188), 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) [2021-11-23 02:14:48,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:48,303 INFO L93 Difference]: Finished difference Result 39330 states and 49655 transitions. [2021-11-23 02:14:48,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:14:48,304 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 62.666666666666664) internal successors, (188), 3 states have internal predecessors, (188), 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 256 [2021-11-23 02:14:48,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:48,334 INFO L225 Difference]: With dead ends: 39330 [2021-11-23 02:14:48,334 INFO L226 Difference]: Without dead ends: 20595 [2021-11-23 02:14:48,349 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 255 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:14:48,350 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 12 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 492 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 534 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 492 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:48,350 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 85 Invalid, 534 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 492 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:14:48,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20595 states. [2021-11-23 02:14:48,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20595 to 17592. [2021-11-23 02:14:48,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17592 states, 17591 states have (on average 1.2557557842078335) internal successors, (22090), 17591 states have internal predecessors, (22090), 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) [2021-11-23 02:14:48,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17592 states to 17592 states and 22090 transitions. [2021-11-23 02:14:48,701 INFO L78 Accepts]: Start accepts. Automaton has 17592 states and 22090 transitions. Word has length 256 [2021-11-23 02:14:48,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:48,702 INFO L470 AbstractCegarLoop]: Abstraction has 17592 states and 22090 transitions. [2021-11-23 02:14:48,702 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 62.666666666666664) internal successors, (188), 3 states have internal predecessors, (188), 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) [2021-11-23 02:14:48,703 INFO L276 IsEmpty]: Start isEmpty. Operand 17592 states and 22090 transitions. [2021-11-23 02:14:48,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2021-11-23 02:14:48,716 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:48,717 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:48,756 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:14:48,929 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-23 02:14:48,930 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:14:48,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:48,931 INFO L85 PathProgramCache]: Analyzing trace with hash -348315892, now seen corresponding path program 1 times [2021-11-23 02:14:48,931 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:14:48,931 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1531865872] [2021-11-23 02:14:48,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:48,931 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:14:48,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:49,059 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 132 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:14:49,059 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:14:49,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1531865872] [2021-11-23 02:14:49,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1531865872] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:14:49,060 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:14:49,060 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:14:49,060 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [978461971] [2021-11-23 02:14:49,061 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:14:49,061 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:14:49,061 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:14:49,062 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:14:49,062 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:14:49,063 INFO L87 Difference]: Start difference. First operand 17592 states and 22090 transitions. Second operand has 3 states, 3 states have (on average 86.0) internal successors, (258), 3 states have internal predecessors, (258), 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) [2021-11-23 02:14:49,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:49,945 INFO L93 Difference]: Finished difference Result 39616 states and 49912 transitions. [2021-11-23 02:14:49,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:14:49,946 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 86.0) internal successors, (258), 3 states have internal predecessors, (258), 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 258 [2021-11-23 02:14:49,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:49,978 INFO L225 Difference]: With dead ends: 39616 [2021-11-23 02:14:49,978 INFO L226 Difference]: Without dead ends: 22740 [2021-11-23 02:14:49,990 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:14:49,994 INFO L933 BasicCegarLoop]: 228 mSDtfsCounter, 150 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 405 mSolverCounterSat, 140 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 232 SdHoareTripleChecker+Invalid, 545 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 140 IncrementalHoareTripleChecker+Valid, 405 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:49,995 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [150 Valid, 232 Invalid, 545 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [140 Valid, 405 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 02:14:50,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22740 states. [2021-11-23 02:14:50,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22740 to 22597. [2021-11-23 02:14:50,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22597 states, 22596 states have (on average 1.2166755177907593) internal successors, (27492), 22596 states have internal predecessors, (27492), 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) [2021-11-23 02:14:50,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22597 states to 22597 states and 27492 transitions. [2021-11-23 02:14:50,357 INFO L78 Accepts]: Start accepts. Automaton has 22597 states and 27492 transitions. Word has length 258 [2021-11-23 02:14:50,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:50,358 INFO L470 AbstractCegarLoop]: Abstraction has 22597 states and 27492 transitions. [2021-11-23 02:14:50,358 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 86.0) internal successors, (258), 3 states have internal predecessors, (258), 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) [2021-11-23 02:14:50,358 INFO L276 IsEmpty]: Start isEmpty. Operand 22597 states and 27492 transitions. [2021-11-23 02:14:50,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 263 [2021-11-23 02:14:50,371 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:50,371 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:50,372 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-23 02:14:50,372 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:14:50,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:50,373 INFO L85 PathProgramCache]: Analyzing trace with hash -1810652713, now seen corresponding path program 1 times [2021-11-23 02:14:50,373 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:14:50,373 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1434331513] [2021-11-23 02:14:50,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:50,374 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:14:50,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:50,507 INFO L134 CoverageAnalysis]: Checked inductivity of 143 backedges. 121 proven. 3 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 02:14:50,507 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:14:50,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1434331513] [2021-11-23 02:14:50,508 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1434331513] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:14:50,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [931284447] [2021-11-23 02:14:50,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:50,508 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:14:50,508 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:14:50,509 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:14:50,525 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:14:50,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:50,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 550 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:14:50,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:14:51,147 INFO L134 CoverageAnalysis]: Checked inductivity of 143 backedges. 118 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:14:51,147 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:14:51,148 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [931284447] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:14:51,148 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:14:51,148 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-23 02:14:51,149 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [107982245] [2021-11-23 02:14:51,149 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:14:51,150 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:14:51,150 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:14:51,150 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:14:51,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:14:51,151 INFO L87 Difference]: Start difference. First operand 22597 states and 27492 transitions. Second operand has 3 states, 3 states have (on average 80.66666666666667) internal successors, (242), 3 states have internal predecessors, (242), 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) [2021-11-23 02:14:51,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:51,965 INFO L93 Difference]: Finished difference Result 44478 states and 54154 transitions. [2021-11-23 02:14:51,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:14:51,966 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 80.66666666666667) internal successors, (242), 3 states have internal predecessors, (242), 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 262 [2021-11-23 02:14:51,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:51,988 INFO L225 Difference]: With dead ends: 44478 [2021-11-23 02:14:51,988 INFO L226 Difference]: Without dead ends: 22025 [2021-11-23 02:14:52,000 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 261 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:14:52,001 INFO L933 BasicCegarLoop]: 246 mSDtfsCounter, 9 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 547 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 250 SdHoareTripleChecker+Invalid, 597 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 547 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:52,002 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 250 Invalid, 597 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 547 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 02:14:52,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22025 states. [2021-11-23 02:14:52,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22025 to 22025. [2021-11-23 02:14:52,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22025 states, 22024 states have (on average 1.2076371231383944) internal successors, (26597), 22024 states have internal predecessors, (26597), 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) [2021-11-23 02:14:52,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22025 states to 22025 states and 26597 transitions. [2021-11-23 02:14:52,256 INFO L78 Accepts]: Start accepts. Automaton has 22025 states and 26597 transitions. Word has length 262 [2021-11-23 02:14:52,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:52,257 INFO L470 AbstractCegarLoop]: Abstraction has 22025 states and 26597 transitions. [2021-11-23 02:14:52,257 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 80.66666666666667) internal successors, (242), 3 states have internal predecessors, (242), 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) [2021-11-23 02:14:52,257 INFO L276 IsEmpty]: Start isEmpty. Operand 22025 states and 26597 transitions. [2021-11-23 02:14:52,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 292 [2021-11-23 02:14:52,274 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:52,275 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:52,308 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-23 02:14:52,489 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-23 02:14:52,490 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:14:52,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:52,491 INFO L85 PathProgramCache]: Analyzing trace with hash 116161547, now seen corresponding path program 1 times [2021-11-23 02:14:52,491 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:14:52,491 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1573110821] [2021-11-23 02:14:52,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:52,491 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:14:52,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:52,780 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 153 proven. 3 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-23 02:14:52,780 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:14:52,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1573110821] [2021-11-23 02:14:52,781 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1573110821] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:14:52,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [464096024] [2021-11-23 02:14:52,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:52,781 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:14:52,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:14:52,790 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:14:52,806 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:14:52,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:52,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 613 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:14:52,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:14:53,438 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 156 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-23 02:14:53,438 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:14:53,438 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [464096024] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:14:53,438 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:14:53,438 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 4 [2021-11-23 02:14:53,439 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1508293298] [2021-11-23 02:14:53,439 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:14:53,439 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:14:53,439 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:14:53,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:14:53,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:14:53,440 INFO L87 Difference]: Start difference. First operand 22025 states and 26597 transitions. Second operand has 4 states, 4 states have (on average 61.25) internal successors, (245), 3 states have internal predecessors, (245), 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) [2021-11-23 02:14:54,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:14:54,416 INFO L93 Difference]: Finished difference Result 45765 states and 55440 transitions. [2021-11-23 02:14:54,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:14:54,417 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 61.25) internal successors, (245), 3 states have internal predecessors, (245), 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 291 [2021-11-23 02:14:54,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:14:54,442 INFO L225 Difference]: With dead ends: 45765 [2021-11-23 02:14:54,442 INFO L226 Difference]: Without dead ends: 24742 [2021-11-23 02:14:54,453 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 290 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:14:54,454 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 259 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 697 mSolverCounterSat, 178 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 259 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 875 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 178 IncrementalHoareTripleChecker+Valid, 697 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:14:54,454 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [259 Valid, 79 Invalid, 875 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [178 Valid, 697 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 02:14:54,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24742 states. [2021-11-23 02:14:54,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24742 to 24170. [2021-11-23 02:14:54,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24170 states, 24169 states have (on average 1.19007819934627) internal successors, (28763), 24169 states have internal predecessors, (28763), 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) [2021-11-23 02:14:54,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24170 states to 24170 states and 28763 transitions. [2021-11-23 02:14:54,745 INFO L78 Accepts]: Start accepts. Automaton has 24170 states and 28763 transitions. Word has length 291 [2021-11-23 02:14:54,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:14:54,746 INFO L470 AbstractCegarLoop]: Abstraction has 24170 states and 28763 transitions. [2021-11-23 02:14:54,746 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 61.25) internal successors, (245), 3 states have internal predecessors, (245), 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) [2021-11-23 02:14:54,746 INFO L276 IsEmpty]: Start isEmpty. Operand 24170 states and 28763 transitions. [2021-11-23 02:14:54,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 314 [2021-11-23 02:14:54,762 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:14:54,762 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:14:54,810 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:14:54,978 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-23 02:14:54,978 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:14:54,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:14:54,978 INFO L85 PathProgramCache]: Analyzing trace with hash -616359713, now seen corresponding path program 1 times [2021-11-23 02:14:54,979 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:14:54,979 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2015613118] [2021-11-23 02:14:54,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:54,979 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:14:55,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:55,232 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 169 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:14:55,232 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:14:55,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2015613118] [2021-11-23 02:14:55,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2015613118] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:14:55,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1231070290] [2021-11-23 02:14:55,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:14:55,233 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:14:55,233 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:14:55,234 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:14:55,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:14:55,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:55,426 INFO L263 TraceCheckSpWp]: Trace formula consists of 592 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:14:55,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:14:55,971 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 169 proven. 48 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:14:55,972 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:14:56,523 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 169 proven. 48 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:14:56,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1231070290] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:14:56,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1274322883] [2021-11-23 02:14:56,551 INFO L159 IcfgInterpreter]: Started Sifa with 145 locations of interest [2021-11-23 02:14:56,552 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:14:56,556 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:14:56,560 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:14:56,561 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:22:33,633 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 46 [2021-11-23 02:22:34,161 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 36736 conjuctions. This might take some time... [2021-11-23 02:22:36,481 INFO L192 XnfTransformerHelper]: Simplified to disjunction of 608 conjuctions. [2021-11-23 02:22:36,514 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 46 [2021-11-23 02:22:36,896 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 36736 conjuctions. This might take some time... [2021-11-23 02:22:39,448 INFO L192 XnfTransformerHelper]: Simplified to disjunction of 608 conjuctions. [2021-11-23 02:22:40,172 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 46 [2021-11-23 02:22:40,553 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 36736 conjuctions. This might take some time... [2021-11-23 02:22:42,949 INFO L192 XnfTransformerHelper]: Simplified to disjunction of 608 conjuctions. [2021-11-23 02:23:17,997 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:23:48,061 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1274322883] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:23:48,062 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:23:48,062 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [4, 3, 3] total 12 [2021-11-23 02:23:48,062 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013650946] [2021-11-23 02:23:48,063 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:23:48,063 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:23:48,064 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:23:48,064 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:23:48,064 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=109, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:23:48,065 INFO L87 Difference]: Start difference. First operand 24170 states and 28763 transitions. Second operand has 7 states, 7 states have (on average 21.0) internal successors, (147), 6 states have internal predecessors, (147), 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) [2021-11-23 02:23:52,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:23:52,524 INFO L93 Difference]: Finished difference Result 48067 states and 57313 transitions. [2021-11-23 02:23:52,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:23:52,525 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 21.0) internal successors, (147), 6 states have internal predecessors, (147), 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 313 [2021-11-23 02:23:52,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:23:52,554 INFO L225 Difference]: With dead ends: 48067 [2021-11-23 02:23:52,554 INFO L226 Difference]: Without dead ends: 24899 [2021-11-23 02:23:52,569 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 944 GetRequests, 649 SyntacticMatches, 281 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1422 ImplicationChecksByTransitivity, 32.1s TimeCoverageRelationStatistics Valid=80, Invalid=160, Unknown=0, NotChecked=0, Total=240 [2021-11-23 02:23:52,569 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 281 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 1235 mSolverCounterSat, 105 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 281 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 1340 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 105 IncrementalHoareTripleChecker+Valid, 1235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:23:52,570 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [281 Valid, 79 Invalid, 1340 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [105 Valid, 1235 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2021-11-23 02:23:52,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24899 states. [2021-11-23 02:23:52,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24899 to 24704. [2021-11-23 02:23:52,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24704 states, 24703 states have (on average 1.189693559486702) internal successors, (29389), 24703 states have internal predecessors, (29389), 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) [2021-11-23 02:23:52,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24704 states to 24704 states and 29389 transitions. [2021-11-23 02:23:52,955 INFO L78 Accepts]: Start accepts. Automaton has 24704 states and 29389 transitions. Word has length 313 [2021-11-23 02:23:52,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:23:52,956 INFO L470 AbstractCegarLoop]: Abstraction has 24704 states and 29389 transitions. [2021-11-23 02:23:52,957 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 21.0) internal successors, (147), 6 states have internal predecessors, (147), 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) [2021-11-23 02:23:52,957 INFO L276 IsEmpty]: Start isEmpty. Operand 24704 states and 29389 transitions. [2021-11-23 02:23:52,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 343 [2021-11-23 02:23:52,974 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:23:52,975 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:23:53,013 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:23:53,201 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:23:53,202 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:23:53,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:23:53,202 INFO L85 PathProgramCache]: Analyzing trace with hash -2133995258, now seen corresponding path program 1 times [2021-11-23 02:23:53,203 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:23:53,203 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1843205459] [2021-11-23 02:23:53,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:23:53,203 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:23:53,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:23:53,386 INFO L134 CoverageAnalysis]: Checked inductivity of 284 backedges. 221 proven. 9 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-23 02:23:53,386 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:23:53,386 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1843205459] [2021-11-23 02:23:53,387 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1843205459] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:23:53,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [240039] [2021-11-23 02:23:53,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:23:53,387 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:23:53,387 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:23:53,388 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:23:53,410 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:23:53,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:23:53,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 699 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:23:53,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:23:54,035 INFO L134 CoverageAnalysis]: Checked inductivity of 284 backedges. 224 proven. 0 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-23 02:23:54,036 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:23:54,036 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [240039] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:23:54,036 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:23:54,036 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2021-11-23 02:23:54,036 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1896945184] [2021-11-23 02:23:54,036 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:23:54,037 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:23:54,037 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:23:54,038 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:23:54,038 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:23:54,038 INFO L87 Difference]: Start difference. First operand 24704 states and 29389 transitions. Second operand has 3 states, 3 states have (on average 97.0) internal successors, (291), 3 states have internal predecessors, (291), 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) [2021-11-23 02:23:54,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:23:54,700 INFO L93 Difference]: Finished difference Result 46585 states and 55485 transitions. [2021-11-23 02:23:54,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:23:54,700 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 97.0) internal successors, (291), 3 states have internal predecessors, (291), 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 342 [2021-11-23 02:23:54,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:23:54,721 INFO L225 Difference]: With dead ends: 46585 [2021-11-23 02:23:54,721 INFO L226 Difference]: Without dead ends: 23417 [2021-11-23 02:23:54,731 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 341 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:23:54,732 INFO L933 BasicCegarLoop]: 254 mSDtfsCounter, 141 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 484 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 141 SdHoareTripleChecker+Valid, 258 SdHoareTripleChecker+Invalid, 552 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 484 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:23:54,732 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [141 Valid, 258 Invalid, 552 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 484 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:23:54,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23417 states. [2021-11-23 02:23:54,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23417 to 22416. [2021-11-23 02:23:54,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22416 states, 22415 states have (on average 1.1775596698639303) internal successors, (26395), 22415 states have internal predecessors, (26395), 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) [2021-11-23 02:23:54,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22416 states to 22416 states and 26395 transitions. [2021-11-23 02:23:54,980 INFO L78 Accepts]: Start accepts. Automaton has 22416 states and 26395 transitions. Word has length 342 [2021-11-23 02:23:54,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:23:54,981 INFO L470 AbstractCegarLoop]: Abstraction has 22416 states and 26395 transitions. [2021-11-23 02:23:54,981 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 97.0) internal successors, (291), 3 states have internal predecessors, (291), 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) [2021-11-23 02:23:54,981 INFO L276 IsEmpty]: Start isEmpty. Operand 22416 states and 26395 transitions. [2021-11-23 02:23:54,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 344 [2021-11-23 02:23:54,992 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:23:54,993 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:23:55,014 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-11-23 02:23:55,193 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:23:55,193 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:23:55,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:23:55,194 INFO L85 PathProgramCache]: Analyzing trace with hash 2030762848, now seen corresponding path program 1 times [2021-11-23 02:23:55,194 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:23:55,194 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [756512008] [2021-11-23 02:23:55,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:23:55,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:23:55,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:23:55,429 INFO L134 CoverageAnalysis]: Checked inductivity of 319 backedges. 271 proven. 18 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 02:23:55,429 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:23:55,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [756512008] [2021-11-23 02:23:55,430 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [756512008] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:23:55,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [84631738] [2021-11-23 02:23:55,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:23:55,431 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:23:55,431 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:23:55,432 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:23:55,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:23:55,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:23:55,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 655 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:23:55,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:23:56,278 INFO L134 CoverageAnalysis]: Checked inductivity of 319 backedges. 313 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:23:56,279 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:23:56,279 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [84631738] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:23:56,279 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:23:56,279 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 7 [2021-11-23 02:23:56,279 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1316593854] [2021-11-23 02:23:56,280 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:23:56,281 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:23:56,281 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:23:56,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:23:56,282 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:23:56,282 INFO L87 Difference]: Start difference. First operand 22416 states and 26395 transitions. Second operand has 4 states, 4 states have (on average 84.5) internal successors, (338), 4 states have internal predecessors, (338), 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) [2021-11-23 02:23:57,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:23:57,297 INFO L93 Difference]: Finished difference Result 49876 states and 59212 transitions. [2021-11-23 02:23:57,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:23:57,298 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 84.5) internal successors, (338), 4 states have internal predecessors, (338), 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 343 [2021-11-23 02:23:57,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:23:57,324 INFO L225 Difference]: With dead ends: 49876 [2021-11-23 02:23:57,324 INFO L226 Difference]: Without dead ends: 28853 [2021-11-23 02:23:57,334 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 341 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:23:57,335 INFO L933 BasicCegarLoop]: 195 mSDtfsCounter, 274 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 904 mSolverCounterSat, 146 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 274 SdHoareTripleChecker+Valid, 207 SdHoareTripleChecker+Invalid, 1050 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 146 IncrementalHoareTripleChecker+Valid, 904 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:23:57,335 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [274 Valid, 207 Invalid, 1050 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [146 Valid, 904 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 02:23:57,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28853 states. [2021-11-23 02:23:57,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28853 to 28279. [2021-11-23 02:23:57,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28279 states, 28278 states have (on average 1.1794681377749487) internal successors, (33353), 28278 states have internal predecessors, (33353), 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) [2021-11-23 02:23:57,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28279 states to 28279 states and 33353 transitions. [2021-11-23 02:23:57,668 INFO L78 Accepts]: Start accepts. Automaton has 28279 states and 33353 transitions. Word has length 343 [2021-11-23 02:23:57,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:23:57,669 INFO L470 AbstractCegarLoop]: Abstraction has 28279 states and 33353 transitions. [2021-11-23 02:23:57,669 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 84.5) internal successors, (338), 4 states have internal predecessors, (338), 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) [2021-11-23 02:23:57,669 INFO L276 IsEmpty]: Start isEmpty. Operand 28279 states and 33353 transitions. [2021-11-23 02:23:57,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 347 [2021-11-23 02:23:57,683 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:23:57,683 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:23:57,704 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:23:57,884 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:23:57,884 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:23:57,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:23:57,884 INFO L85 PathProgramCache]: Analyzing trace with hash -2120733001, now seen corresponding path program 1 times [2021-11-23 02:23:57,884 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:23:57,885 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2006032727] [2021-11-23 02:23:57,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:23:57,885 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:23:57,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:23:58,003 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 144 proven. 0 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2021-11-23 02:23:58,004 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:23:58,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2006032727] [2021-11-23 02:23:58,004 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2006032727] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:23:58,004 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:23:58,004 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:23:58,005 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1974254339] [2021-11-23 02:23:58,005 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:23:58,005 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:23:58,006 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:23:58,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:23:58,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:23:58,007 INFO L87 Difference]: Start difference. First operand 28279 states and 33353 transitions. Second operand has 4 states, 4 states have (on average 46.25) internal successors, (185), 3 states have internal predecessors, (185), 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) [2021-11-23 02:23:59,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:23:59,027 INFO L93 Difference]: Finished difference Result 70611 states and 83612 transitions. [2021-11-23 02:23:59,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:23:59,034 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 46.25) internal successors, (185), 3 states have internal predecessors, (185), 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 346 [2021-11-23 02:23:59,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:23:59,088 INFO L225 Difference]: With dead ends: 70611 [2021-11-23 02:23:59,088 INFO L226 Difference]: Without dead ends: 43725 [2021-11-23 02:23:59,106 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:23:59,108 INFO L933 BasicCegarLoop]: 138 mSDtfsCounter, 313 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 668 mSolverCounterSat, 132 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 313 SdHoareTripleChecker+Valid, 280 SdHoareTripleChecker+Invalid, 800 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 132 IncrementalHoareTripleChecker+Valid, 668 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:23:59,108 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [313 Valid, 280 Invalid, 800 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [132 Valid, 668 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 02:23:59,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43725 states. [2021-11-23 02:23:59,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43725 to 42722. [2021-11-23 02:23:59,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42722 states, 42721 states have (on average 1.1619812270312024) internal successors, (49641), 42721 states have internal predecessors, (49641), 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) [2021-11-23 02:23:59,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42722 states to 42722 states and 49641 transitions. [2021-11-23 02:23:59,719 INFO L78 Accepts]: Start accepts. Automaton has 42722 states and 49641 transitions. Word has length 346 [2021-11-23 02:23:59,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:23:59,719 INFO L470 AbstractCegarLoop]: Abstraction has 42722 states and 49641 transitions. [2021-11-23 02:23:59,720 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 46.25) internal successors, (185), 3 states have internal predecessors, (185), 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) [2021-11-23 02:23:59,720 INFO L276 IsEmpty]: Start isEmpty. Operand 42722 states and 49641 transitions. [2021-11-23 02:23:59,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 358 [2021-11-23 02:23:59,733 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:23:59,734 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:23:59,734 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-11-23 02:23:59,734 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:23:59,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:23:59,734 INFO L85 PathProgramCache]: Analyzing trace with hash 953619954, now seen corresponding path program 1 times [2021-11-23 02:23:59,735 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:23:59,735 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [827537449] [2021-11-23 02:23:59,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:23:59,735 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:23:59,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:23:59,855 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 111 proven. 6 refuted. 0 times theorem prover too weak. 218 trivial. 0 not checked. [2021-11-23 02:23:59,855 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:23:59,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [827537449] [2021-11-23 02:23:59,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [827537449] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:23:59,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [81889425] [2021-11-23 02:23:59,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:23:59,856 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:23:59,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:23:59,862 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:23:59,873 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_42f267dc-625d-4ea5-9f50-982db57d2599/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 02:24:00,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:24:00,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 677 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:24:00,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:24:00,549 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 213 proven. 79 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 02:24:00,550 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:24:01,160 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 213 proven. 79 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 02:24:01,160 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [81889425] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:24:01,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1607507481] [2021-11-23 02:24:01,168 INFO L159 IcfgInterpreter]: Started Sifa with 145 locations of interest [2021-11-23 02:24:01,168 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:24:01,169 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:24:01,169 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:24:01,169 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs