./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.4_2.ufo.UNBOUNDED.pals.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.4_2.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7 --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 01a21536345230b7194ff5017879c469eb8be909ba72352bb81feb2f101a934f --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 18:48:42,249 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 18:48:42,252 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 18:48:42,320 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 18:48:42,321 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 18:48:42,327 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 18:48:42,330 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 18:48:42,335 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 18:48:42,338 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 18:48:42,346 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 18:48:42,347 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 18:48:42,349 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 18:48:42,350 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 18:48:42,353 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 18:48:42,355 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 18:48:42,361 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 18:48:42,364 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 18:48:42,366 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 18:48:42,368 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 18:48:42,373 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 18:48:42,377 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 18:48:42,380 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 18:48:42,382 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 18:48:42,385 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 18:48:42,392 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 18:48:42,395 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 18:48:42,395 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 18:48:42,398 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 18:48:42,398 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 18:48:42,400 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 18:48:42,400 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 18:48:42,402 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 18:48:42,404 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 18:48:42,405 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 18:48:42,407 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 18:48:42,407 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 18:48:42,408 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 18:48:42,408 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 18:48:42,409 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 18:48:42,410 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 18:48:42,410 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 18:48:42,411 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 18:48:42,464 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 18:48:42,465 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 18:48:42,465 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 18:48:42,466 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 18:48:42,467 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 18:48:42,467 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 18:48:42,467 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 18:48:42,468 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 18:48:42,468 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 18:48:42,468 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 18:48:42,469 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 18:48:42,470 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 18:48:42,470 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 18:48:42,470 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 18:48:42,471 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 18:48:42,471 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 18:48:42,471 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 18:48:42,471 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 18:48:42,472 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 18:48:42,472 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 18:48:42,473 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 18:48:42,473 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 18:48:42,473 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 18:48:42,473 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 18:48:42,474 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 18:48:42,474 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 18:48:42,476 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 18:48:42,476 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 18:48:42,476 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 18:48:42,477 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 18:48:42,477 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 18:48:42,477 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 18:48:42,478 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:48:42,478 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 18:48:42,478 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 18:48:42,478 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 18:48:42,479 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 18:48:42,479 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 18:48:42,479 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 18:48:42,479 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 18:48:42,480 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 18:48:42,480 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_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 01a21536345230b7194ff5017879c469eb8be909ba72352bb81feb2f101a934f [2021-11-25 18:48:42,778 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 18:48:42,806 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 18:48:42,809 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 18:48:42,810 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 18:48:42,811 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 18:48:42,812 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.4_2.ufo.UNBOUNDED.pals.c [2021-11-25 18:48:42,890 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/data/c3fc64f13/a91fcfbc8f874e618e336b9843dd2342/FLAG0bc8ed066 [2021-11-25 18:48:43,450 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 18:48:43,451 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.4_2.ufo.UNBOUNDED.pals.c [2021-11-25 18:48:43,468 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/data/c3fc64f13/a91fcfbc8f874e618e336b9843dd2342/FLAG0bc8ed066 [2021-11-25 18:48:43,727 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/data/c3fc64f13/a91fcfbc8f874e618e336b9843dd2342 [2021-11-25 18:48:43,729 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 18:48:43,731 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 18:48:43,732 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 18:48:43,733 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 18:48:43,736 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 18:48:43,737 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:48:43" (1/1) ... [2021-11-25 18:48:43,738 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3ecf1195 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:48:43, skipping insertion in model container [2021-11-25 18:48:43,738 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:48:43" (1/1) ... [2021-11-25 18:48:43,746 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 18:48:43,796 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 18:48:44,075 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_114cb4ea-4fb4-4058-8589-00d021112230/sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.4_2.ufo.UNBOUNDED.pals.c[14684,14697] [2021-11-25 18:48:44,079 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:48:44,090 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 18:48:44,172 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_114cb4ea-4fb4-4058-8589-00d021112230/sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.4_2.ufo.UNBOUNDED.pals.c[14684,14697] [2021-11-25 18:48:44,173 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:48:44,189 INFO L208 MainTranslator]: Completed translation [2021-11-25 18:48:44,190 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:48:44 WrapperNode [2021-11-25 18:48:44,190 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 18:48:44,191 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 18:48:44,192 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 18:48:44,192 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 18:48:44,200 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:48:44" (1/1) ... [2021-11-25 18:48:44,216 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:48:44" (1/1) ... [2021-11-25 18:48:44,274 INFO L137 Inliner]: procedures = 32, calls = 48, calls flagged for inlining = 12, calls inlined = 12, statements flattened = 535 [2021-11-25 18:48:44,282 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 18:48:44,283 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 18:48:44,283 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 18:48:44,283 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 18:48:44,293 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:48:44" (1/1) ... [2021-11-25 18:48:44,294 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:48:44" (1/1) ... [2021-11-25 18:48:44,310 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:48:44" (1/1) ... [2021-11-25 18:48:44,310 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:48:44" (1/1) ... [2021-11-25 18:48:44,325 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:48:44" (1/1) ... [2021-11-25 18:48:44,333 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:48:44" (1/1) ... [2021-11-25 18:48:44,336 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:48:44" (1/1) ... [2021-11-25 18:48:44,361 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 18:48:44,362 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 18:48:44,362 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 18:48:44,362 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 18:48:44,363 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:48:44" (1/1) ... [2021-11-25 18:48:44,371 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:48:44,395 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:44,416 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 18:48:44,442 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 18:48:44,466 INFO L130 BoogieDeclarations]: Found specification of procedure read_manual_selection_history [2021-11-25 18:48:44,467 INFO L138 BoogieDeclarations]: Found implementation of procedure read_manual_selection_history [2021-11-25 18:48:44,467 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 18:48:44,467 INFO L130 BoogieDeclarations]: Found specification of procedure read_side2_failed_history [2021-11-25 18:48:44,467 INFO L138 BoogieDeclarations]: Found implementation of procedure read_side2_failed_history [2021-11-25 18:48:44,468 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2021-11-25 18:48:44,468 INFO L138 BoogieDeclarations]: Found implementation of procedure assert [2021-11-25 18:48:44,468 INFO L130 BoogieDeclarations]: Found specification of procedure flip_the_side [2021-11-25 18:48:44,468 INFO L138 BoogieDeclarations]: Found implementation of procedure flip_the_side [2021-11-25 18:48:44,468 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-25 18:48:44,468 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-25 18:48:44,468 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 18:48:44,469 INFO L130 BoogieDeclarations]: Found specification of procedure read_side1_failed_history [2021-11-25 18:48:44,469 INFO L138 BoogieDeclarations]: Found implementation of procedure read_side1_failed_history [2021-11-25 18:48:44,469 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 18:48:44,469 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 18:48:44,469 INFO L130 BoogieDeclarations]: Found specification of procedure read_active_side_history [2021-11-25 18:48:44,469 INFO L138 BoogieDeclarations]: Found implementation of procedure read_active_side_history [2021-11-25 18:48:44,641 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 18:48:44,643 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 18:48:45,231 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 18:48:45,495 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 18:48:45,495 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-25 18:48:45,498 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:48:45 BoogieIcfgContainer [2021-11-25 18:48:45,498 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 18:48:45,500 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 18:48:45,500 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 18:48:45,504 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 18:48:45,504 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 06:48:43" (1/3) ... [2021-11-25 18:48:45,505 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5cd45002 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:48:45, skipping insertion in model container [2021-11-25 18:48:45,505 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:48:44" (2/3) ... [2021-11-25 18:48:45,506 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5cd45002 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:48:45, skipping insertion in model container [2021-11-25 18:48:45,506 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:48:45" (3/3) ... [2021-11-25 18:48:45,507 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_STARTPALS_ActiveStandby.4_2.ufo.UNBOUNDED.pals.c [2021-11-25 18:48:45,521 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 18:48:45,521 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 18:48:45,595 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 18:48:45,605 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 [2021-11-25 18:48:45,605 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 18:48:45,632 INFO L276 IsEmpty]: Start isEmpty. Operand has 149 states, 109 states have (on average 1.5412844036697249) internal successors, (168), 111 states have internal predecessors, (168), 31 states have call successors, (31), 7 states have call predecessors, (31), 7 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2021-11-25 18:48:45,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-25 18:48:45,638 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:45,639 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:48:45,639 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:45,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:45,643 INFO L85 PathProgramCache]: Analyzing trace with hash -1402390635, now seen corresponding path program 1 times [2021-11-25 18:48:45,651 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:45,651 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [523584518] [2021-11-25 18:48:45,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:45,652 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:45,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:46,072 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:46,073 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:46,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [523584518] [2021-11-25 18:48:46,074 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [523584518] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:48:46,074 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:48:46,075 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:48:46,076 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [846292937] [2021-11-25 18:48:46,077 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:48:46,083 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:48:46,084 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:46,119 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:48:46,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:48:46,125 INFO L87 Difference]: Start difference. First operand has 149 states, 109 states have (on average 1.5412844036697249) internal successors, (168), 111 states have internal predecessors, (168), 31 states have call successors, (31), 7 states have call predecessors, (31), 7 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) Second operand has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:48:46,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:46,277 INFO L93 Difference]: Finished difference Result 298 states and 487 transitions. [2021-11-25 18:48:46,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:48:46,280 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-11-25 18:48:46,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:46,290 INFO L225 Difference]: With dead ends: 298 [2021-11-25 18:48:46,291 INFO L226 Difference]: Without dead ends: 152 [2021-11-25 18:48:46,296 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:48:46,300 INFO L933 BasicCegarLoop]: 211 mSDtfsCounter, 5 mSDsluCounter, 434 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 623 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:46,301 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 623 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:48:46,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-11-25 18:48:46,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 152. [2021-11-25 18:48:46,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 112 states have (on average 1.5089285714285714) internal successors, (169), 113 states have internal predecessors, (169), 31 states have call successors, (31), 8 states have call predecessors, (31), 8 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2021-11-25 18:48:46,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 231 transitions. [2021-11-25 18:48:46,358 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 231 transitions. Word has length 19 [2021-11-25 18:48:46,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:46,359 INFO L470 AbstractCegarLoop]: Abstraction has 152 states and 231 transitions. [2021-11-25 18:48:46,359 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-25 18:48:46,360 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 231 transitions. [2021-11-25 18:48:46,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-25 18:48:46,362 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:46,362 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-25 18:48:46,362 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 18:48:46,363 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:46,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:46,364 INFO L85 PathProgramCache]: Analyzing trace with hash 698242933, now seen corresponding path program 1 times [2021-11-25 18:48:46,364 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:46,364 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [861061763] [2021-11-25 18:48:46,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:46,365 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:46,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:46,486 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 18:48:46,487 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:46,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [861061763] [2021-11-25 18:48:46,488 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [861061763] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:48:46,488 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:48:46,488 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 18:48:46,488 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497423120] [2021-11-25 18:48:46,489 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:48:46,490 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 18:48:46,491 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:46,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 18:48:46,492 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:48:46,493 INFO L87 Difference]: Start difference. First operand 152 states and 231 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 18:48:46,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:46,900 INFO L93 Difference]: Finished difference Result 432 states and 672 transitions. [2021-11-25 18:48:46,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 18:48:46,901 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 30 [2021-11-25 18:48:46,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:46,912 INFO L225 Difference]: With dead ends: 432 [2021-11-25 18:48:46,913 INFO L226 Difference]: Without dead ends: 283 [2021-11-25 18:48:46,919 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-25 18:48:46,922 INFO L933 BasicCegarLoop]: 209 mSDtfsCounter, 566 mSDsluCounter, 389 mSDsCounter, 0 mSdLazyCounter, 176 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 566 SdHoareTripleChecker+Valid, 593 SdHoareTripleChecker+Invalid, 244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:46,926 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [566 Valid, 593 Invalid, 244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 176 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:48:46,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2021-11-25 18:48:46,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 186. [2021-11-25 18:48:46,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 141 states have (on average 1.5106382978723405) internal successors, (213), 141 states have internal predecessors, (213), 34 states have call successors, (34), 10 states have call predecessors, (34), 10 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-25 18:48:46,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 281 transitions. [2021-11-25 18:48:46,960 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 281 transitions. Word has length 30 [2021-11-25 18:48:46,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:46,961 INFO L470 AbstractCegarLoop]: Abstraction has 186 states and 281 transitions. [2021-11-25 18:48:46,961 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 18:48:46,961 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 281 transitions. [2021-11-25 18:48:46,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-25 18:48:46,963 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:46,963 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-25 18:48:46,963 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 18:48:46,964 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:46,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:46,965 INFO L85 PathProgramCache]: Analyzing trace with hash -1421239568, now seen corresponding path program 1 times [2021-11-25 18:48:46,965 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:46,965 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [834850542] [2021-11-25 18:48:46,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:46,966 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:47,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:47,083 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 18:48:47,084 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:47,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [834850542] [2021-11-25 18:48:47,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [834850542] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:48:47,085 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:48:47,085 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 18:48:47,085 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2104270437] [2021-11-25 18:48:47,085 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:48:47,086 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 18:48:47,086 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:47,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 18:48:47,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:48:47,087 INFO L87 Difference]: Start difference. First operand 186 states and 281 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 18:48:47,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:47,382 INFO L93 Difference]: Finished difference Result 432 states and 670 transitions. [2021-11-25 18:48:47,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 18:48:47,383 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 31 [2021-11-25 18:48:47,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:47,387 INFO L225 Difference]: With dead ends: 432 [2021-11-25 18:48:47,387 INFO L226 Difference]: Without dead ends: 283 [2021-11-25 18:48:47,388 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-25 18:48:47,395 INFO L933 BasicCegarLoop]: 210 mSDtfsCounter, 562 mSDsluCounter, 391 mSDsCounter, 0 mSdLazyCounter, 172 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 562 SdHoareTripleChecker+Valid, 596 SdHoareTripleChecker+Invalid, 240 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 172 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:47,398 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [562 Valid, 596 Invalid, 240 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 172 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:48:47,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2021-11-25 18:48:47,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 186. [2021-11-25 18:48:47,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 141 states have (on average 1.50354609929078) internal successors, (212), 141 states have internal predecessors, (212), 34 states have call successors, (34), 10 states have call predecessors, (34), 10 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-25 18:48:47,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 280 transitions. [2021-11-25 18:48:47,440 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 280 transitions. Word has length 31 [2021-11-25 18:48:47,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:47,440 INFO L470 AbstractCegarLoop]: Abstraction has 186 states and 280 transitions. [2021-11-25 18:48:47,441 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 18:48:47,453 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 280 transitions. [2021-11-25 18:48:47,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-25 18:48:47,455 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:47,455 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:48:47,456 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 18:48:47,456 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:47,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:47,457 INFO L85 PathProgramCache]: Analyzing trace with hash 1401044311, now seen corresponding path program 1 times [2021-11-25 18:48:47,457 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:47,457 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [393277424] [2021-11-25 18:48:47,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:47,457 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:47,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:47,563 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 18:48:47,564 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:47,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [393277424] [2021-11-25 18:48:47,564 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [393277424] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:48:47,565 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:48:47,565 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:48:47,565 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [976203046] [2021-11-25 18:48:47,565 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:48:47,566 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:48:47,566 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:47,566 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:48:47,567 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:48:47,567 INFO L87 Difference]: Start difference. First operand 186 states and 280 transitions. Second operand has 4 states, 4 states have (on average 6.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 18:48:47,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:47,639 INFO L93 Difference]: Finished difference Result 340 states and 514 transitions. [2021-11-25 18:48:47,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:48:47,639 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 33 [2021-11-25 18:48:47,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:47,642 INFO L225 Difference]: With dead ends: 340 [2021-11-25 18:48:47,642 INFO L226 Difference]: Without dead ends: 191 [2021-11-25 18:48:47,643 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:48:47,644 INFO L933 BasicCegarLoop]: 213 mSDtfsCounter, 6 mSDsluCounter, 444 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 635 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:47,645 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 635 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:48:47,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-11-25 18:48:47,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 191. [2021-11-25 18:48:47,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 145 states have (on average 1.4896551724137932) internal successors, (216), 145 states have internal predecessors, (216), 34 states have call successors, (34), 11 states have call predecessors, (34), 11 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-25 18:48:47,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 284 transitions. [2021-11-25 18:48:47,664 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 284 transitions. Word has length 33 [2021-11-25 18:48:47,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:47,664 INFO L470 AbstractCegarLoop]: Abstraction has 191 states and 284 transitions. [2021-11-25 18:48:47,665 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 18:48:47,665 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 284 transitions. [2021-11-25 18:48:47,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-25 18:48:47,667 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:47,667 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-25 18:48:47,667 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 18:48:47,668 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:47,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:47,668 INFO L85 PathProgramCache]: Analyzing trace with hash -1975676803, now seen corresponding path program 1 times [2021-11-25 18:48:47,668 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:47,669 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1305733541] [2021-11-25 18:48:47,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:47,669 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:47,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:47,799 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 18:48:47,800 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:47,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1305733541] [2021-11-25 18:48:47,801 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1305733541] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:48:47,801 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:48:47,801 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:48:47,801 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867020105] [2021-11-25 18:48:47,802 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:48:47,804 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:48:47,807 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:47,808 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:48:47,808 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:48:47,808 INFO L87 Difference]: Start difference. First operand 191 states and 284 transitions. Second operand has 4 states, 4 states have (on average 7.5) internal successors, (30), 3 states have internal predecessors, (30), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-25 18:48:47,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:47,895 INFO L93 Difference]: Finished difference Result 350 states and 525 transitions. [2021-11-25 18:48:47,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:48:47,896 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.5) internal successors, (30), 3 states have internal predecessors, (30), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 41 [2021-11-25 18:48:47,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:47,898 INFO L225 Difference]: With dead ends: 350 [2021-11-25 18:48:47,904 INFO L226 Difference]: Without dead ends: 196 [2021-11-25 18:48:47,905 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:48:47,906 INFO L933 BasicCegarLoop]: 210 mSDtfsCounter, 6 mSDsluCounter, 433 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 621 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:47,906 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 621 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:48:47,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-11-25 18:48:47,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2021-11-25 18:48:47,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 149 states have (on average 1.476510067114094) internal successors, (220), 149 states have internal predecessors, (220), 34 states have call successors, (34), 12 states have call predecessors, (34), 12 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-25 18:48:47,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 288 transitions. [2021-11-25 18:48:47,930 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 288 transitions. Word has length 41 [2021-11-25 18:48:47,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:47,932 INFO L470 AbstractCegarLoop]: Abstraction has 196 states and 288 transitions. [2021-11-25 18:48:47,933 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.5) internal successors, (30), 3 states have internal predecessors, (30), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-25 18:48:47,933 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 288 transitions. [2021-11-25 18:48:47,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-25 18:48:47,939 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:47,940 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:48:47,940 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 18:48:47,940 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:47,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:47,941 INFO L85 PathProgramCache]: Analyzing trace with hash -819289017, now seen corresponding path program 1 times [2021-11-25 18:48:47,941 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:47,942 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1467345966] [2021-11-25 18:48:47,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:47,942 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:47,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:48,076 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 18:48:48,076 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:48,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1467345966] [2021-11-25 18:48:48,076 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1467345966] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:48:48,076 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:48:48,077 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:48:48,077 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [40820737] [2021-11-25 18:48:48,077 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:48:48,077 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:48:48,077 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:48,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:48:48,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:48:48,079 INFO L87 Difference]: Start difference. First operand 196 states and 288 transitions. Second operand has 4 states, 4 states have (on average 9.0) internal successors, (36), 3 states have internal predecessors, (36), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-25 18:48:48,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:48,163 INFO L93 Difference]: Finished difference Result 359 states and 529 transitions. [2021-11-25 18:48:48,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:48:48,163 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 3 states have internal predecessors, (36), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) Word has length 49 [2021-11-25 18:48:48,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:48,168 INFO L225 Difference]: With dead ends: 359 [2021-11-25 18:48:48,168 INFO L226 Difference]: Without dead ends: 200 [2021-11-25 18:48:48,169 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:48:48,171 INFO L933 BasicCegarLoop]: 215 mSDtfsCounter, 5 mSDsluCounter, 437 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 630 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:48,173 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 630 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:48:48,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-11-25 18:48:48,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 200. [2021-11-25 18:48:48,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 152 states have (on average 1.4671052631578947) internal successors, (223), 152 states have internal predecessors, (223), 34 states have call successors, (34), 13 states have call predecessors, (34), 13 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-25 18:48:48,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 291 transitions. [2021-11-25 18:48:48,191 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 291 transitions. Word has length 49 [2021-11-25 18:48:48,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:48,192 INFO L470 AbstractCegarLoop]: Abstraction has 200 states and 291 transitions. [2021-11-25 18:48:48,192 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 3 states have internal predecessors, (36), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-25 18:48:48,192 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 291 transitions. [2021-11-25 18:48:48,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-25 18:48:48,194 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:48,195 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-25 18:48:48,195 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 18:48:48,195 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:48,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:48,195 INFO L85 PathProgramCache]: Analyzing trace with hash 1577170286, now seen corresponding path program 1 times [2021-11-25 18:48:48,197 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:48,197 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1349069442] [2021-11-25 18:48:48,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:48,199 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:48,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:48,333 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 18:48:48,333 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:48,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1349069442] [2021-11-25 18:48:48,334 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1349069442] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:48:48,334 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:48:48,334 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:48:48,334 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163783211] [2021-11-25 18:48:48,334 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:48:48,335 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:48:48,335 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:48,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:48:48,335 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:48:48,336 INFO L87 Difference]: Start difference. First operand 200 states and 291 transitions. Second operand has 4 states, 4 states have (on average 9.0) internal successors, (36), 3 states have internal predecessors, (36), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-25 18:48:48,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:48,415 INFO L93 Difference]: Finished difference Result 368 states and 539 transitions. [2021-11-25 18:48:48,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:48:48,415 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 3 states have internal predecessors, (36), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) Word has length 49 [2021-11-25 18:48:48,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:48,418 INFO L225 Difference]: With dead ends: 368 [2021-11-25 18:48:48,418 INFO L226 Difference]: Without dead ends: 205 [2021-11-25 18:48:48,419 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:48:48,422 INFO L933 BasicCegarLoop]: 210 mSDtfsCounter, 6 mSDsluCounter, 433 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 621 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:48,422 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 621 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:48:48,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2021-11-25 18:48:48,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 205. [2021-11-25 18:48:48,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 156 states have (on average 1.455128205128205) internal successors, (227), 156 states have internal predecessors, (227), 34 states have call successors, (34), 14 states have call predecessors, (34), 14 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-25 18:48:48,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 295 transitions. [2021-11-25 18:48:48,437 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 295 transitions. Word has length 49 [2021-11-25 18:48:48,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:48,438 INFO L470 AbstractCegarLoop]: Abstraction has 205 states and 295 transitions. [2021-11-25 18:48:48,438 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 3 states have internal predecessors, (36), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-25 18:48:48,438 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 295 transitions. [2021-11-25 18:48:48,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-25 18:48:48,439 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:48,439 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-25 18:48:48,440 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-25 18:48:48,440 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:48,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:48,440 INFO L85 PathProgramCache]: Analyzing trace with hash 46065614, now seen corresponding path program 1 times [2021-11-25 18:48:48,440 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:48,441 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [146108519] [2021-11-25 18:48:48,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:48,441 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:48,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:48,549 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 18:48:48,549 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:48,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [146108519] [2021-11-25 18:48:48,549 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [146108519] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:48:48,550 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:48:48,550 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:48:48,550 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [738204787] [2021-11-25 18:48:48,550 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:48:48,551 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:48:48,551 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:48,551 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:48:48,551 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:48:48,552 INFO L87 Difference]: Start difference. First operand 205 states and 295 transitions. Second operand has 4 states, 4 states have (on average 9.5) internal successors, (38), 3 states have internal predecessors, (38), 2 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-25 18:48:48,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:48,620 INFO L93 Difference]: Finished difference Result 379 states and 546 transitions. [2021-11-25 18:48:48,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:48:48,621 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.5) internal successors, (38), 3 states have internal predecessors, (38), 2 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 57 [2021-11-25 18:48:48,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:48,623 INFO L225 Difference]: With dead ends: 379 [2021-11-25 18:48:48,623 INFO L226 Difference]: Without dead ends: 211 [2021-11-25 18:48:48,624 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:48:48,625 INFO L933 BasicCegarLoop]: 214 mSDtfsCounter, 7 mSDsluCounter, 440 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 632 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:48,625 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 632 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:48:48,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2021-11-25 18:48:48,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 211. [2021-11-25 18:48:48,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 161 states have (on average 1.4409937888198758) internal successors, (232), 161 states have internal predecessors, (232), 34 states have call successors, (34), 15 states have call predecessors, (34), 15 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-25 18:48:48,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 300 transitions. [2021-11-25 18:48:48,640 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 300 transitions. Word has length 57 [2021-11-25 18:48:48,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:48,640 INFO L470 AbstractCegarLoop]: Abstraction has 211 states and 300 transitions. [2021-11-25 18:48:48,641 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.5) internal successors, (38), 3 states have internal predecessors, (38), 2 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-25 18:48:48,641 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 300 transitions. [2021-11-25 18:48:48,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-25 18:48:48,642 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:48,642 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] [2021-11-25 18:48:48,642 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-25 18:48:48,643 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:48,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:48,643 INFO L85 PathProgramCache]: Analyzing trace with hash 202306747, now seen corresponding path program 1 times [2021-11-25 18:48:48,643 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:48,644 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1181943222] [2021-11-25 18:48:48,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:48,644 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:48,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:48,844 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 18:48:48,845 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:48,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1181943222] [2021-11-25 18:48:48,845 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1181943222] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:48,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [876691958] [2021-11-25 18:48:48,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:48,846 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:48,846 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:48,851 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:48,858 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 18:48:48,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:49,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 18:48:49,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:49,420 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:48:49,421 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:48:49,421 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [876691958] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:48:49,421 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:48:49,421 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [9] total 14 [2021-11-25 18:48:49,422 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297680313] [2021-11-25 18:48:49,422 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:48:49,423 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 18:48:49,424 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:49,424 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 18:48:49,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2021-11-25 18:48:49,425 INFO L87 Difference]: Start difference. First operand 211 states and 300 transitions. Second operand has 8 states, 6 states have (on average 7.5) internal successors, (45), 8 states have internal predecessors, (45), 4 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-25 18:48:49,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:49,719 INFO L93 Difference]: Finished difference Result 598 states and 836 transitions. [2021-11-25 18:48:49,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 18:48:49,719 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 7.5) internal successors, (45), 8 states have internal predecessors, (45), 4 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) Word has length 60 [2021-11-25 18:48:49,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:49,723 INFO L225 Difference]: With dead ends: 598 [2021-11-25 18:48:49,723 INFO L226 Difference]: Without dead ends: 398 [2021-11-25 18:48:49,724 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-11-25 18:48:49,724 INFO L933 BasicCegarLoop]: 241 mSDtfsCounter, 222 mSDsluCounter, 945 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 223 SdHoareTripleChecker+Valid, 1144 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:49,725 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [223 Valid, 1144 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 163 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:48:49,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 398 states. [2021-11-25 18:48:49,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 398 to 395. [2021-11-25 18:48:49,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 395 states, 299 states have (on average 1.4214046822742474) internal successors, (425), 300 states have internal predecessors, (425), 65 states have call successors, (65), 30 states have call predecessors, (65), 30 states have return successors, (65), 64 states have call predecessors, (65), 65 states have call successors, (65) [2021-11-25 18:48:49,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 555 transitions. [2021-11-25 18:48:49,751 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 555 transitions. Word has length 60 [2021-11-25 18:48:49,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:49,751 INFO L470 AbstractCegarLoop]: Abstraction has 395 states and 555 transitions. [2021-11-25 18:48:49,751 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 7.5) internal successors, (45), 8 states have internal predecessors, (45), 4 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-25 18:48:49,751 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 555 transitions. [2021-11-25 18:48:49,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-25 18:48:49,752 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:49,753 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] [2021-11-25 18:48:49,786 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-25 18:48:49,966 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-25 18:48:49,967 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:49,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:49,967 INFO L85 PathProgramCache]: Analyzing trace with hash 1935039856, now seen corresponding path program 1 times [2021-11-25 18:48:49,967 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:49,967 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [779934764] [2021-11-25 18:48:49,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:49,968 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:50,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:50,186 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 18:48:50,186 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:50,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [779934764] [2021-11-25 18:48:50,187 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [779934764] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:50,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2146767078] [2021-11-25 18:48:50,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:50,187 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:50,187 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:50,195 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:50,212 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 18:48:50,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:50,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 400 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 18:48:50,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:50,834 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:48:50,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:51,144 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 18:48:51,145 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2146767078] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:51,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1180472350] [2021-11-25 18:48:51,179 INFO L159 IcfgInterpreter]: Started Sifa with 57 locations of interest [2021-11-25 18:48:51,179 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:51,184 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:51,190 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:51,190 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:55,009 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 111 for LOIs [2021-11-25 18:48:55,172 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 108 for LOIs [2021-11-25 18:48:55,190 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 104 for LOIs [2021-11-25 18:48:55,261 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:49:08,544 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1180472350] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:49:08,545 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:49:08,545 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [9, 9, 9] total 37 [2021-11-25 18:49:08,546 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1513290749] [2021-11-25 18:49:08,546 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:49:08,546 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-25 18:49:08,547 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:49:08,547 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-25 18:49:08,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1200, Unknown=0, NotChecked=0, Total=1332 [2021-11-25 18:49:08,548 INFO L87 Difference]: Start difference. First operand 395 states and 555 transitions. Second operand has 26 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 18 states have internal predecessors, (43), 5 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-25 18:49:15,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:49:15,416 INFO L93 Difference]: Finished difference Result 819 states and 1158 transitions. [2021-11-25 18:49:15,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-25 18:49:15,417 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 18 states have internal predecessors, (43), 5 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 62 [2021-11-25 18:49:15,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:49:15,422 INFO L225 Difference]: With dead ends: 819 [2021-11-25 18:49:15,422 INFO L226 Difference]: Without dead ends: 464 [2021-11-25 18:49:15,424 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 154 SyntacticMatches, 4 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 337 ImplicationChecksByTransitivity, 15.9s TimeCoverageRelationStatistics Valid=155, Invalid=1405, Unknown=0, NotChecked=0, Total=1560 [2021-11-25 18:49:15,425 INFO L933 BasicCegarLoop]: 279 mSDtfsCounter, 134 mSDsluCounter, 3259 mSDsCounter, 0 mSdLazyCounter, 2070 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 3521 SdHoareTripleChecker+Invalid, 2123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 2070 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:49:15,426 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 3521 Invalid, 2123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 2070 Invalid, 0 Unknown, 0 Unchecked, 4.2s Time] [2021-11-25 18:49:15,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 464 states. [2021-11-25 18:49:15,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 464 to 441. [2021-11-25 18:49:15,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 441 states, 330 states have (on average 1.4) internal successors, (462), 331 states have internal predecessors, (462), 78 states have call successors, (78), 32 states have call predecessors, (78), 32 states have return successors, (78), 77 states have call predecessors, (78), 78 states have call successors, (78) [2021-11-25 18:49:15,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441 states to 441 states and 618 transitions. [2021-11-25 18:49:15,480 INFO L78 Accepts]: Start accepts. Automaton has 441 states and 618 transitions. Word has length 62 [2021-11-25 18:49:15,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:49:15,480 INFO L470 AbstractCegarLoop]: Abstraction has 441 states and 618 transitions. [2021-11-25 18:49:15,481 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 18 states have internal predecessors, (43), 5 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-25 18:49:15,481 INFO L276 IsEmpty]: Start isEmpty. Operand 441 states and 618 transitions. [2021-11-25 18:49:15,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-25 18:49:15,482 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:49:15,482 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] [2021-11-25 18:49:15,516 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 18:49:15,706 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 18:49:15,707 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:49:15,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:49:15,707 INFO L85 PathProgramCache]: Analyzing trace with hash -1493661489, now seen corresponding path program 1 times [2021-11-25 18:49:15,707 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:49:15,707 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1849443217] [2021-11-25 18:49:15,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:49:15,707 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:49:15,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:15,911 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 18:49:15,911 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:49:15,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1849443217] [2021-11-25 18:49:15,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1849443217] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:49:15,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1096429313] [2021-11-25 18:49:15,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:49:15,912 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:49:15,912 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:49:15,913 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:49:15,937 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 18:49:16,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:16,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 400 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 18:49:16,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:49:16,337 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:49:16,337 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:49:16,546 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 18:49:16,546 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1096429313] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:49:16,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [274023489] [2021-11-25 18:49:16,551 INFO L159 IcfgInterpreter]: Started Sifa with 57 locations of interest [2021-11-25 18:49:16,551 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:49:16,551 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:49:16,551 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:49:16,552 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:49:33,337 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 174 for LOIs [2021-11-25 18:49:34,746 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-25 18:49:34,748 INFO L197 IcfgInterpreter]: Interpreting procedure read_side1_failed_history with input of size 21 for LOIs [2021-11-25 18:49:34,756 INFO L197 IcfgInterpreter]: Interpreting procedure assert with input of size 30 for LOIs [2021-11-25 18:49:34,766 INFO L197 IcfgInterpreter]: Interpreting procedure read_side2_failed_history with input of size 26 for LOIs [2021-11-25 18:49:34,787 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 15 for LOIs [2021-11-25 18:49:34,793 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:49:46,953 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10108#(and (= |assert_#in~arg| 0) (<= ~manual_selection_History_1~0 127) (<= ~active_side_History_1~0 127) (<= 0 ~active_side_History_0~0) (= assert_~arg |assert_#in~arg|) (not (= (mod ~side1Failed_History_1~0 256) 0)) (= (mod ~side2Failed_History_1~0 256) 0) (<= ~active_side_History_0~0 2) (not (= 2 ~active_side_History_0~0)) (not (= ~manual_selection_History_1~0 0)) (<= 0 (+ ~manual_selection_History_1~0 128)) (<= 0 (+ ~active_side_History_1~0 128)))' at error location [2021-11-25 18:49:46,954 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:49:46,954 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:49:46,954 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 13 [2021-11-25 18:49:46,954 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528162312] [2021-11-25 18:49:46,954 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:49:46,960 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-25 18:49:46,960 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:49:46,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-25 18:49:46,963 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=2829, Unknown=0, NotChecked=0, Total=3080 [2021-11-25 18:49:46,963 INFO L87 Difference]: Start difference. First operand 441 states and 618 transitions. Second operand has 13 states, 9 states have (on average 7.444444444444445) internal successors, (67), 12 states have internal predecessors, (67), 4 states have call successors, (15), 3 states have call predecessors, (15), 8 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-25 18:49:47,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:49:47,517 INFO L93 Difference]: Finished difference Result 1153 states and 1628 transitions. [2021-11-25 18:49:47,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 18:49:47,518 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 9 states have (on average 7.444444444444445) internal successors, (67), 12 states have internal predecessors, (67), 4 states have call successors, (15), 3 states have call predecessors, (15), 8 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) Word has length 62 [2021-11-25 18:49:47,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:49:47,524 INFO L225 Difference]: With dead ends: 1153 [2021-11-25 18:49:47,524 INFO L226 Difference]: Without dead ends: 795 [2021-11-25 18:49:47,527 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 130 SyntacticMatches, 9 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1126 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=277, Invalid=3383, Unknown=0, NotChecked=0, Total=3660 [2021-11-25 18:49:47,528 INFO L933 BasicCegarLoop]: 287 mSDtfsCounter, 269 mSDsluCounter, 1952 mSDsCounter, 0 mSdLazyCounter, 401 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 288 SdHoareTripleChecker+Valid, 2131 SdHoareTripleChecker+Invalid, 437 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 401 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:49:47,528 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [288 Valid, 2131 Invalid, 437 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 401 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:49:47,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 795 states. [2021-11-25 18:49:47,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 795 to 496. [2021-11-25 18:49:47,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 496 states, 369 states have (on average 1.3712737127371273) internal successors, (506), 372 states have internal predecessors, (506), 84 states have call successors, (84), 42 states have call predecessors, (84), 42 states have return successors, (84), 81 states have call predecessors, (84), 84 states have call successors, (84) [2021-11-25 18:49:47,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 496 states to 496 states and 674 transitions. [2021-11-25 18:49:47,593 INFO L78 Accepts]: Start accepts. Automaton has 496 states and 674 transitions. Word has length 62 [2021-11-25 18:49:47,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:49:47,594 INFO L470 AbstractCegarLoop]: Abstraction has 496 states and 674 transitions. [2021-11-25 18:49:47,594 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 9 states have (on average 7.444444444444445) internal successors, (67), 12 states have internal predecessors, (67), 4 states have call successors, (15), 3 states have call predecessors, (15), 8 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-25 18:49:47,594 INFO L276 IsEmpty]: Start isEmpty. Operand 496 states and 674 transitions. [2021-11-25 18:49:47,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-25 18:49:47,595 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:49:47,596 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:49:47,637 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 18:49:47,814 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-25 18:49:47,815 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:49:47,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:49:47,815 INFO L85 PathProgramCache]: Analyzing trace with hash 372001254, now seen corresponding path program 1 times [2021-11-25 18:49:47,815 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:49:47,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [80291637] [2021-11-25 18:49:47,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:49:47,816 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:49:47,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:47,880 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 18:49:47,880 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:49:47,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [80291637] [2021-11-25 18:49:47,880 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [80291637] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:49:47,880 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:49:47,880 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:49:47,881 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775231821] [2021-11-25 18:49:47,881 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:49:47,881 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:49:47,881 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:49:47,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:49:47,882 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:49:47,882 INFO L87 Difference]: Start difference. First operand 496 states and 674 transitions. Second operand has 4 states, 4 states have (on average 11.75) internal successors, (47), 3 states have internal predecessors, (47), 2 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-25 18:49:47,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:49:47,979 INFO L93 Difference]: Finished difference Result 905 states and 1235 transitions. [2021-11-25 18:49:47,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:49:47,980 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.75) internal successors, (47), 3 states have internal predecessors, (47), 2 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) Word has length 66 [2021-11-25 18:49:47,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:49:47,985 INFO L225 Difference]: With dead ends: 905 [2021-11-25 18:49:47,985 INFO L226 Difference]: Without dead ends: 508 [2021-11-25 18:49:47,986 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:49:47,988 INFO L933 BasicCegarLoop]: 215 mSDtfsCounter, 5 mSDsluCounter, 437 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 630 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:49:47,988 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 630 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:49:47,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 508 states. [2021-11-25 18:49:48,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 508 to 508. [2021-11-25 18:49:48,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 508 states, 378 states have (on average 1.3624338624338623) internal successors, (515), 381 states have internal predecessors, (515), 84 states have call successors, (84), 45 states have call predecessors, (84), 45 states have return successors, (84), 81 states have call predecessors, (84), 84 states have call successors, (84) [2021-11-25 18:49:48,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 508 states to 508 states and 683 transitions. [2021-11-25 18:49:48,045 INFO L78 Accepts]: Start accepts. Automaton has 508 states and 683 transitions. Word has length 66 [2021-11-25 18:49:48,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:49:48,047 INFO L470 AbstractCegarLoop]: Abstraction has 508 states and 683 transitions. [2021-11-25 18:49:48,047 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.75) internal successors, (47), 3 states have internal predecessors, (47), 2 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-25 18:49:48,047 INFO L276 IsEmpty]: Start isEmpty. Operand 508 states and 683 transitions. [2021-11-25 18:49:48,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-25 18:49:48,051 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:49:48,051 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-25 18:49:48,051 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-25 18:49:48,052 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:49:48,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:49:48,052 INFO L85 PathProgramCache]: Analyzing trace with hash 1950784243, now seen corresponding path program 1 times [2021-11-25 18:49:48,052 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:49:48,053 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [934948722] [2021-11-25 18:49:48,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:49:48,053 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:49:48,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:48,147 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 18:49:48,148 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:49:48,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [934948722] [2021-11-25 18:49:48,148 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [934948722] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:49:48,148 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:49:48,148 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 18:49:48,151 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1666260837] [2021-11-25 18:49:48,151 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:49:48,152 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 18:49:48,152 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:49:48,152 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 18:49:48,152 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:49:48,153 INFO L87 Difference]: Start difference. First operand 508 states and 683 transitions. Second operand has 6 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-25 18:49:48,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:49:48,338 INFO L93 Difference]: Finished difference Result 640 states and 893 transitions. [2021-11-25 18:49:48,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 18:49:48,338 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) Word has length 65 [2021-11-25 18:49:48,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:49:48,344 INFO L225 Difference]: With dead ends: 640 [2021-11-25 18:49:48,344 INFO L226 Difference]: Without dead ends: 638 [2021-11-25 18:49:48,344 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-25 18:49:48,345 INFO L933 BasicCegarLoop]: 382 mSDtfsCounter, 171 mSDsluCounter, 1374 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 193 SdHoareTripleChecker+Valid, 1698 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:49:48,346 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [193 Valid, 1698 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:49:48,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 638 states. [2021-11-25 18:49:48,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 638 to 512. [2021-11-25 18:49:48,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 512 states, 380 states have (on average 1.3605263157894736) internal successors, (517), 384 states have internal predecessors, (517), 85 states have call successors, (85), 46 states have call predecessors, (85), 46 states have return successors, (85), 81 states have call predecessors, (85), 85 states have call successors, (85) [2021-11-25 18:49:48,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 512 states to 512 states and 687 transitions. [2021-11-25 18:49:48,402 INFO L78 Accepts]: Start accepts. Automaton has 512 states and 687 transitions. Word has length 65 [2021-11-25 18:49:48,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:49:48,403 INFO L470 AbstractCegarLoop]: Abstraction has 512 states and 687 transitions. [2021-11-25 18:49:48,403 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-25 18:49:48,403 INFO L276 IsEmpty]: Start isEmpty. Operand 512 states and 687 transitions. [2021-11-25 18:49:48,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-25 18:49:48,408 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:49:48,408 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:49:48,408 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-25 18:49:48,408 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:49:48,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:49:48,409 INFO L85 PathProgramCache]: Analyzing trace with hash 1894530078, now seen corresponding path program 1 times [2021-11-25 18:49:48,409 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:49:48,409 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [716646206] [2021-11-25 18:49:48,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:49:48,410 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:49:48,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:48,477 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 18:49:48,477 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:49:48,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [716646206] [2021-11-25 18:49:48,477 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [716646206] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:49:48,477 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:49:48,477 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:49:48,478 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [578368466] [2021-11-25 18:49:48,478 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:49:48,478 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:49:48,478 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:49:48,479 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:49:48,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:49:48,479 INFO L87 Difference]: Start difference. First operand 512 states and 687 transitions. Second operand has 4 states, 4 states have (on average 11.25) internal successors, (45), 3 states have internal predecessors, (45), 2 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-25 18:49:48,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:49:48,585 INFO L93 Difference]: Finished difference Result 831 states and 1118 transitions. [2021-11-25 18:49:48,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:49:48,586 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 3 states have internal predecessors, (45), 2 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) Word has length 68 [2021-11-25 18:49:48,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:49:48,591 INFO L225 Difference]: With dead ends: 831 [2021-11-25 18:49:48,591 INFO L226 Difference]: Without dead ends: 506 [2021-11-25 18:49:48,592 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:49:48,593 INFO L933 BasicCegarLoop]: 210 mSDtfsCounter, 7 mSDsluCounter, 434 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 622 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:49:48,593 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 622 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:49:48,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 506 states. [2021-11-25 18:49:48,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 506 to 506. [2021-11-25 18:49:48,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 506 states, 377 states have (on average 1.339522546419098) internal successors, (505), 381 states have internal predecessors, (505), 82 states have call successors, (82), 46 states have call predecessors, (82), 46 states have return successors, (82), 78 states have call predecessors, (82), 82 states have call successors, (82) [2021-11-25 18:49:48,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 506 states to 506 states and 669 transitions. [2021-11-25 18:49:48,647 INFO L78 Accepts]: Start accepts. Automaton has 506 states and 669 transitions. Word has length 68 [2021-11-25 18:49:48,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:49:48,648 INFO L470 AbstractCegarLoop]: Abstraction has 506 states and 669 transitions. [2021-11-25 18:49:48,648 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 3 states have internal predecessors, (45), 2 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-25 18:49:48,648 INFO L276 IsEmpty]: Start isEmpty. Operand 506 states and 669 transitions. [2021-11-25 18:49:48,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-25 18:49:48,649 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:49:48,650 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:49:48,650 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-25 18:49:48,650 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:49:48,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:49:48,651 INFO L85 PathProgramCache]: Analyzing trace with hash 359885845, now seen corresponding path program 1 times [2021-11-25 18:49:48,651 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:49:48,651 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1820657958] [2021-11-25 18:49:48,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:49:48,651 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:49:48,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:48,971 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 18:49:48,971 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:49:48,971 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1820657958] [2021-11-25 18:49:48,971 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1820657958] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:49:48,971 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [648276623] [2021-11-25 18:49:48,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:49:48,972 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:49:48,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:49:48,975 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:49:49,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 18:49:49,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:49:49,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 418 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 18:49:49,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:49:49,491 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 18:49:49,492 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:49:49,760 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 18:49:49,761 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [648276623] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:49:49,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1687022035] [2021-11-25 18:49:49,764 INFO L159 IcfgInterpreter]: Started Sifa with 60 locations of interest [2021-11-25 18:49:49,765 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:49:49,765 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:49:49,765 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:49:49,765 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:50:06,615 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 174 for LOIs [2021-11-25 18:50:08,026 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 16 for LOIs [2021-11-25 18:50:08,028 INFO L197 IcfgInterpreter]: Interpreting procedure read_side1_failed_history with input of size 30 for LOIs [2021-11-25 18:50:08,043 INFO L197 IcfgInterpreter]: Interpreting procedure assert with input of size 31 for LOIs [2021-11-25 18:50:08,051 INFO L197 IcfgInterpreter]: Interpreting procedure read_side2_failed_history with input of size 25 for LOIs [2021-11-25 18:50:08,062 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 15 for LOIs [2021-11-25 18:50:08,073 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:50:22,178 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17904#(and (= |assert_#in~arg| 0) (<= ~manual_selection_History_1~0 127) (<= ~active_side_History_1~0 127) (not (= ~active_side_History_0~0 1)) (<= 0 ~active_side_History_0~0) (= assert_~arg |assert_#in~arg|) (<= ~active_side_History_0~0 2) (not (= (mod ~side2Failed_History_1~0 256) 0)) (not (= ~manual_selection_History_1~0 0)) (<= 0 (+ ~manual_selection_History_1~0 128)) (<= 0 (+ ~active_side_History_1~0 128)) (= (mod ~side1Failed_History_1~0 256) 0))' at error location [2021-11-25 18:50:22,178 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:50:22,178 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:50:22,179 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 9, 9] total 20 [2021-11-25 18:50:22,179 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670424709] [2021-11-25 18:50:22,179 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:50:22,179 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-25 18:50:22,179 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:50:22,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-25 18:50:22,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=301, Invalid=3859, Unknown=0, NotChecked=0, Total=4160 [2021-11-25 18:50:22,182 INFO L87 Difference]: Start difference. First operand 506 states and 669 transitions. Second operand has 20 states, 15 states have (on average 6.0) internal successors, (90), 18 states have internal predecessors, (90), 6 states have call successors, (22), 3 states have call predecessors, (22), 9 states have return successors, (22), 7 states have call predecessors, (22), 6 states have call successors, (22) [2021-11-25 18:50:23,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:50:23,403 INFO L93 Difference]: Finished difference Result 1124 states and 1550 transitions. [2021-11-25 18:50:23,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 18:50:23,404 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 15 states have (on average 6.0) internal successors, (90), 18 states have internal predecessors, (90), 6 states have call successors, (22), 3 states have call predecessors, (22), 9 states have return successors, (22), 7 states have call predecessors, (22), 6 states have call successors, (22) Word has length 70 [2021-11-25 18:50:23,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:50:23,410 INFO L225 Difference]: With dead ends: 1124 [2021-11-25 18:50:23,410 INFO L226 Difference]: Without dead ends: 755 [2021-11-25 18:50:23,415 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 148 SyntacticMatches, 11 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1592 ImplicationChecksByTransitivity, 14.6s TimeCoverageRelationStatistics Valid=352, Invalid=4760, Unknown=0, NotChecked=0, Total=5112 [2021-11-25 18:50:23,417 INFO L933 BasicCegarLoop]: 365 mSDtfsCounter, 564 mSDsluCounter, 4237 mSDsCounter, 0 mSdLazyCounter, 895 mSolverCounterSat, 126 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 599 SdHoareTripleChecker+Valid, 4389 SdHoareTripleChecker+Invalid, 1021 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 126 IncrementalHoareTripleChecker+Valid, 895 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 18:50:23,417 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [599 Valid, 4389 Invalid, 1021 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [126 Valid, 895 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 18:50:23,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 755 states. [2021-11-25 18:50:23,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 755 to 512. [2021-11-25 18:50:23,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 512 states, 382 states have (on average 1.3350785340314135) internal successors, (510), 387 states have internal predecessors, (510), 80 states have call successors, (80), 49 states have call predecessors, (80), 49 states have return successors, (80), 75 states have call predecessors, (80), 80 states have call successors, (80) [2021-11-25 18:50:23,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 512 states to 512 states and 670 transitions. [2021-11-25 18:50:23,488 INFO L78 Accepts]: Start accepts. Automaton has 512 states and 670 transitions. Word has length 70 [2021-11-25 18:50:23,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:50:23,488 INFO L470 AbstractCegarLoop]: Abstraction has 512 states and 670 transitions. [2021-11-25 18:50:23,488 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 15 states have (on average 6.0) internal successors, (90), 18 states have internal predecessors, (90), 6 states have call successors, (22), 3 states have call predecessors, (22), 9 states have return successors, (22), 7 states have call predecessors, (22), 6 states have call successors, (22) [2021-11-25 18:50:23,488 INFO L276 IsEmpty]: Start isEmpty. Operand 512 states and 670 transitions. [2021-11-25 18:50:23,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-25 18:50:23,490 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:50:23,491 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:50:23,519 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 18:50:23,702 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-25 18:50:23,703 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:50:23,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:50:23,703 INFO L85 PathProgramCache]: Analyzing trace with hash -992035311, now seen corresponding path program 1 times [2021-11-25 18:50:23,703 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:50:23,704 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [518171856] [2021-11-25 18:50:23,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:50:23,704 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:50:23,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:50:23,865 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 18:50:23,865 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:50:23,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [518171856] [2021-11-25 18:50:23,866 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [518171856] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:50:23,866 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:50:23,866 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-25 18:50:23,866 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1089293197] [2021-11-25 18:50:23,866 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:50:23,867 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 18:50:23,867 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:50:23,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 18:50:23,868 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-25 18:50:23,868 INFO L87 Difference]: Start difference. First operand 512 states and 670 transitions. Second operand has 8 states, 8 states have (on average 6.25) internal successors, (50), 7 states have internal predecessors, (50), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 18:50:24,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:50:24,619 INFO L93 Difference]: Finished difference Result 1210 states and 1663 transitions. [2021-11-25 18:50:24,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 18:50:24,620 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 6.25) internal successors, (50), 7 states have internal predecessors, (50), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) Word has length 71 [2021-11-25 18:50:24,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:50:24,627 INFO L225 Difference]: With dead ends: 1210 [2021-11-25 18:50:24,627 INFO L226 Difference]: Without dead ends: 901 [2021-11-25 18:50:24,628 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2021-11-25 18:50:24,629 INFO L933 BasicCegarLoop]: 430 mSDtfsCounter, 705 mSDsluCounter, 1364 mSDsCounter, 0 mSdLazyCounter, 472 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 711 SdHoareTripleChecker+Valid, 1739 SdHoareTripleChecker+Invalid, 595 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 472 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 18:50:24,629 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [711 Valid, 1739 Invalid, 595 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 472 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 18:50:24,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 901 states. [2021-11-25 18:50:24,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 901 to 639. [2021-11-25 18:50:24,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 639 states, 474 states have (on average 1.3291139240506329) internal successors, (630), 479 states have internal predecessors, (630), 103 states have call successors, (103), 61 states have call predecessors, (103), 61 states have return successors, (103), 98 states have call predecessors, (103), 103 states have call successors, (103) [2021-11-25 18:50:24,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 639 states to 639 states and 836 transitions. [2021-11-25 18:50:24,712 INFO L78 Accepts]: Start accepts. Automaton has 639 states and 836 transitions. Word has length 71 [2021-11-25 18:50:24,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:50:24,713 INFO L470 AbstractCegarLoop]: Abstraction has 639 states and 836 transitions. [2021-11-25 18:50:24,713 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 6.25) internal successors, (50), 7 states have internal predecessors, (50), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-25 18:50:24,713 INFO L276 IsEmpty]: Start isEmpty. Operand 639 states and 836 transitions. [2021-11-25 18:50:24,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-25 18:50:24,714 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:50:24,715 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:50:24,715 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-25 18:50:24,715 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:50:24,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:50:24,715 INFO L85 PathProgramCache]: Analyzing trace with hash -2067927662, now seen corresponding path program 1 times [2021-11-25 18:50:24,716 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:50:24,716 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1654061377] [2021-11-25 18:50:24,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:50:24,716 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:50:24,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:50:24,772 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 18:50:24,772 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:50:24,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1654061377] [2021-11-25 18:50:24,773 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1654061377] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:50:24,773 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:50:24,773 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:50:24,773 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743068776] [2021-11-25 18:50:24,773 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:50:24,774 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:50:24,774 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:50:24,774 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:50:24,775 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:50:24,777 INFO L87 Difference]: Start difference. First operand 639 states and 836 transitions. Second operand has 4 states, 4 states have (on average 12.25) internal successors, (49), 4 states have internal predecessors, (49), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-25 18:50:25,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:50:25,043 INFO L93 Difference]: Finished difference Result 1597 states and 2132 transitions. [2021-11-25 18:50:25,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:50:25,044 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.25) internal successors, (49), 4 states have internal predecessors, (49), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 71 [2021-11-25 18:50:25,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:50:25,052 INFO L225 Difference]: With dead ends: 1597 [2021-11-25 18:50:25,052 INFO L226 Difference]: Without dead ends: 1156 [2021-11-25 18:50:25,054 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:50:25,055 INFO L933 BasicCegarLoop]: 305 mSDtfsCounter, 339 mSDsluCounter, 524 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 339 SdHoareTripleChecker+Valid, 809 SdHoareTripleChecker+Invalid, 154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:50:25,055 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [339 Valid, 809 Invalid, 154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:50:25,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1156 states. [2021-11-25 18:50:25,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1156 to 1038. [2021-11-25 18:50:25,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1038 states, 769 states have (on average 1.319895968790637) internal successors, (1015), 778 states have internal predecessors, (1015), 168 states have call successors, (168), 100 states have call predecessors, (168), 100 states have return successors, (168), 159 states have call predecessors, (168), 168 states have call successors, (168) [2021-11-25 18:50:25,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1038 states to 1038 states and 1351 transitions. [2021-11-25 18:50:25,197 INFO L78 Accepts]: Start accepts. Automaton has 1038 states and 1351 transitions. Word has length 71 [2021-11-25 18:50:25,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:50:25,197 INFO L470 AbstractCegarLoop]: Abstraction has 1038 states and 1351 transitions. [2021-11-25 18:50:25,198 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.25) internal successors, (49), 4 states have internal predecessors, (49), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-25 18:50:25,198 INFO L276 IsEmpty]: Start isEmpty. Operand 1038 states and 1351 transitions. [2021-11-25 18:50:25,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-25 18:50:25,199 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:50:25,200 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:50:25,200 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-25 18:50:25,200 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:50:25,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:50:25,201 INFO L85 PathProgramCache]: Analyzing trace with hash 2033385991, now seen corresponding path program 1 times [2021-11-25 18:50:25,201 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:50:25,201 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1654914992] [2021-11-25 18:50:25,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:50:25,201 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:50:25,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:50:25,334 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 18:50:25,334 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:50:25,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1654914992] [2021-11-25 18:50:25,335 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1654914992] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:50:25,335 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:50:25,335 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-25 18:50:25,335 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611939521] [2021-11-25 18:50:25,335 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:50:25,336 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 18:50:25,336 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:50:25,336 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 18:50:25,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-25 18:50:25,337 INFO L87 Difference]: Start difference. First operand 1038 states and 1351 transitions. Second operand has 8 states, 8 states have (on average 6.5) internal successors, (52), 7 states have internal predecessors, (52), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) [2021-11-25 18:50:26,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:50:26,245 INFO L93 Difference]: Finished difference Result 2933 states and 3981 transitions. [2021-11-25 18:50:26,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 18:50:26,246 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 6.5) internal successors, (52), 7 states have internal predecessors, (52), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) Word has length 73 [2021-11-25 18:50:26,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:50:26,261 INFO L225 Difference]: With dead ends: 2933 [2021-11-25 18:50:26,261 INFO L226 Difference]: Without dead ends: 2149 [2021-11-25 18:50:26,264 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2021-11-25 18:50:26,265 INFO L933 BasicCegarLoop]: 442 mSDtfsCounter, 771 mSDsluCounter, 1477 mSDsCounter, 0 mSdLazyCounter, 514 mSolverCounterSat, 189 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 777 SdHoareTripleChecker+Valid, 1829 SdHoareTripleChecker+Invalid, 703 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 189 IncrementalHoareTripleChecker+Valid, 514 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 18:50:26,265 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [777 Valid, 1829 Invalid, 703 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [189 Valid, 514 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 18:50:26,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2149 states. [2021-11-25 18:50:26,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2149 to 1453. [2021-11-25 18:50:26,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1453 states, 1068 states have (on average 1.3099250936329587) internal successors, (1399), 1080 states have internal predecessors, (1399), 244 states have call successors, (244), 140 states have call predecessors, (244), 140 states have return successors, (244), 232 states have call predecessors, (244), 244 states have call successors, (244) [2021-11-25 18:50:26,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1453 states to 1453 states and 1887 transitions. [2021-11-25 18:50:26,448 INFO L78 Accepts]: Start accepts. Automaton has 1453 states and 1887 transitions. Word has length 73 [2021-11-25 18:50:26,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:50:26,449 INFO L470 AbstractCegarLoop]: Abstraction has 1453 states and 1887 transitions. [2021-11-25 18:50:26,449 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 6.5) internal successors, (52), 7 states have internal predecessors, (52), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) [2021-11-25 18:50:26,449 INFO L276 IsEmpty]: Start isEmpty. Operand 1453 states and 1887 transitions. [2021-11-25 18:50:26,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-25 18:50:26,451 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:50:26,452 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:50:26,452 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-25 18:50:26,452 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:50:26,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:50:26,453 INFO L85 PathProgramCache]: Analyzing trace with hash 972839730, now seen corresponding path program 1 times [2021-11-25 18:50:26,453 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:50:26,453 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [708822163] [2021-11-25 18:50:26,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:50:26,453 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:50:26,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:50:26,509 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 18:50:26,509 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:50:26,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [708822163] [2021-11-25 18:50:26,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [708822163] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:50:26,509 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:50:26,510 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:50:26,511 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144511272] [2021-11-25 18:50:26,511 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:50:26,512 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:50:26,512 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:50:26,512 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:50:26,513 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:50:26,513 INFO L87 Difference]: Start difference. First operand 1453 states and 1887 transitions. Second operand has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-25 18:50:26,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:50:26,932 INFO L93 Difference]: Finished difference Result 3505 states and 4617 transitions. [2021-11-25 18:50:26,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:50:26,932 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 75 [2021-11-25 18:50:26,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:50:26,949 INFO L225 Difference]: With dead ends: 3505 [2021-11-25 18:50:26,949 INFO L226 Difference]: Without dead ends: 2442 [2021-11-25 18:50:26,952 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:50:26,953 INFO L933 BasicCegarLoop]: 331 mSDtfsCounter, 364 mSDsluCounter, 565 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 364 SdHoareTripleChecker+Valid, 873 SdHoareTripleChecker+Invalid, 146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:50:26,953 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [364 Valid, 873 Invalid, 146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:50:26,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2442 states. [2021-11-25 18:50:27,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2442 to 2157. [2021-11-25 18:50:27,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2157 states, 1582 states have (on average 1.3008849557522124) internal successors, (2058), 1599 states have internal predecessors, (2058), 367 states have call successors, (367), 207 states have call predecessors, (367), 207 states have return successors, (367), 350 states have call predecessors, (367), 367 states have call successors, (367) [2021-11-25 18:50:27,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2157 states to 2157 states and 2792 transitions. [2021-11-25 18:50:27,221 INFO L78 Accepts]: Start accepts. Automaton has 2157 states and 2792 transitions. Word has length 75 [2021-11-25 18:50:27,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:50:27,221 INFO L470 AbstractCegarLoop]: Abstraction has 2157 states and 2792 transitions. [2021-11-25 18:50:27,221 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-25 18:50:27,222 INFO L276 IsEmpty]: Start isEmpty. Operand 2157 states and 2792 transitions. [2021-11-25 18:50:27,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-25 18:50:27,225 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:50:27,225 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:50:27,225 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-25 18:50:27,226 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:50:27,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:50:27,226 INFO L85 PathProgramCache]: Analyzing trace with hash -1045851784, now seen corresponding path program 1 times [2021-11-25 18:50:27,226 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:50:27,227 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [630625781] [2021-11-25 18:50:27,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:50:27,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:50:27,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:50:27,282 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 18:50:27,282 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:50:27,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [630625781] [2021-11-25 18:50:27,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [630625781] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:50:27,283 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:50:27,283 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:50:27,283 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041849626] [2021-11-25 18:50:27,283 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:50:27,284 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:50:27,284 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:50:27,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:50:27,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:50:27,285 INFO L87 Difference]: Start difference. First operand 2157 states and 2792 transitions. Second operand has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-25 18:50:27,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:50:27,720 INFO L93 Difference]: Finished difference Result 4748 states and 6213 transitions. [2021-11-25 18:50:27,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:50:27,721 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 75 [2021-11-25 18:50:27,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:50:27,743 INFO L225 Difference]: With dead ends: 4748 [2021-11-25 18:50:27,743 INFO L226 Difference]: Without dead ends: 3152 [2021-11-25 18:50:27,748 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:50:27,749 INFO L933 BasicCegarLoop]: 394 mSDtfsCounter, 340 mSDsluCounter, 567 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 340 SdHoareTripleChecker+Valid, 941 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:50:27,752 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [340 Valid, 941 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:50:27,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3152 states. [2021-11-25 18:50:28,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3152 to 2896. [2021-11-25 18:50:28,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2896 states, 2122 states have (on average 1.295947219604147) internal successors, (2750), 2145 states have internal predecessors, (2750), 496 states have call successors, (496), 277 states have call predecessors, (496), 277 states have return successors, (496), 473 states have call predecessors, (496), 496 states have call successors, (496) [2021-11-25 18:50:28,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2896 states to 2896 states and 3742 transitions. [2021-11-25 18:50:28,103 INFO L78 Accepts]: Start accepts. Automaton has 2896 states and 3742 transitions. Word has length 75 [2021-11-25 18:50:28,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:50:28,103 INFO L470 AbstractCegarLoop]: Abstraction has 2896 states and 3742 transitions. [2021-11-25 18:50:28,104 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-25 18:50:28,104 INFO L276 IsEmpty]: Start isEmpty. Operand 2896 states and 3742 transitions. [2021-11-25 18:50:28,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-25 18:50:28,107 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:50:28,107 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:50:28,107 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-25 18:50:28,107 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:50:28,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:50:28,108 INFO L85 PathProgramCache]: Analyzing trace with hash -829001926, now seen corresponding path program 1 times [2021-11-25 18:50:28,108 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:50:28,108 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1764353683] [2021-11-25 18:50:28,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:50:28,109 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:50:28,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:50:28,173 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 18:50:28,173 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:50:28,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1764353683] [2021-11-25 18:50:28,174 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1764353683] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:50:28,174 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:50:28,174 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:50:28,175 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1004150185] [2021-11-25 18:50:28,175 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:50:28,175 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:50:28,175 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:50:28,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:50:28,176 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:50:28,176 INFO L87 Difference]: Start difference. First operand 2896 states and 3742 transitions. Second operand has 4 states, 4 states have (on average 12.25) internal successors, (49), 3 states have internal predecessors, (49), 2 states have call successors, (10), 3 states have call predecessors, (10), 1 states have return successors, (8), 1 states have call predecessors, (8), 1 states have call successors, (8) [2021-11-25 18:50:28,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:50:28,456 INFO L93 Difference]: Finished difference Result 5075 states and 6603 transitions. [2021-11-25 18:50:28,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:50:28,457 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.25) internal successors, (49), 3 states have internal predecessors, (49), 2 states have call successors, (10), 3 states have call predecessors, (10), 1 states have return successors, (8), 1 states have call predecessors, (8), 1 states have call successors, (8) Word has length 77 [2021-11-25 18:50:28,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:50:28,476 INFO L225 Difference]: With dead ends: 5075 [2021-11-25 18:50:28,476 INFO L226 Difference]: Without dead ends: 2856 [2021-11-25 18:50:28,482 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:50:28,483 INFO L933 BasicCegarLoop]: 206 mSDtfsCounter, 7 mSDsluCounter, 420 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 604 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:50:28,484 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 604 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:50:28,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2856 states. [2021-11-25 18:50:28,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2856 to 2856. [2021-11-25 18:50:28,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2856 states, 2102 states have (on average 1.2702188392007612) internal successors, (2670), 2125 states have internal predecessors, (2670), 476 states have call successors, (476), 277 states have call predecessors, (476), 277 states have return successors, (476), 453 states have call predecessors, (476), 476 states have call successors, (476) [2021-11-25 18:50:28,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2856 states to 2856 states and 3622 transitions. [2021-11-25 18:50:28,800 INFO L78 Accepts]: Start accepts. Automaton has 2856 states and 3622 transitions. Word has length 77 [2021-11-25 18:50:28,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:50:28,801 INFO L470 AbstractCegarLoop]: Abstraction has 2856 states and 3622 transitions. [2021-11-25 18:50:28,801 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.25) internal successors, (49), 3 states have internal predecessors, (49), 2 states have call successors, (10), 3 states have call predecessors, (10), 1 states have return successors, (8), 1 states have call predecessors, (8), 1 states have call successors, (8) [2021-11-25 18:50:28,801 INFO L276 IsEmpty]: Start isEmpty. Operand 2856 states and 3622 transitions. [2021-11-25 18:50:28,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-25 18:50:28,804 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:50:28,805 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:50:28,805 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-11-25 18:50:28,805 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:50:28,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:50:28,805 INFO L85 PathProgramCache]: Analyzing trace with hash -1645706650, now seen corresponding path program 1 times [2021-11-25 18:50:28,806 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:50:28,806 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1437081683] [2021-11-25 18:50:28,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:50:28,806 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:50:28,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:50:28,849 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 18:50:28,850 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:50:28,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1437081683] [2021-11-25 18:50:28,850 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1437081683] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:50:28,850 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:50:28,850 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:50:28,850 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1087552246] [2021-11-25 18:50:28,851 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:50:28,851 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:50:28,851 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:50:28,851 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:50:28,852 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:50:28,852 INFO L87 Difference]: Start difference. First operand 2856 states and 3622 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-25 18:50:29,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:50:29,327 INFO L93 Difference]: Finished difference Result 6143 states and 8117 transitions. [2021-11-25 18:50:29,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:50:29,328 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 76 [2021-11-25 18:50:29,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:50:29,355 INFO L225 Difference]: With dead ends: 6143 [2021-11-25 18:50:29,355 INFO L226 Difference]: Without dead ends: 3784 [2021-11-25 18:50:29,363 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 [2021-11-25 18:50:29,364 INFO L933 BasicCegarLoop]: 344 mSDtfsCounter, 111 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 527 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:50:29,364 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 527 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:50:29,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3784 states. [2021-11-25 18:50:29,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3784 to 2861. [2021-11-25 18:50:29,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2861 states, 2107 states have (on average 1.269577598481253) internal successors, (2675), 2130 states have internal predecessors, (2675), 476 states have call successors, (476), 277 states have call predecessors, (476), 277 states have return successors, (476), 453 states have call predecessors, (476), 476 states have call successors, (476) [2021-11-25 18:50:29,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2861 states to 2861 states and 3627 transitions. [2021-11-25 18:50:29,727 INFO L78 Accepts]: Start accepts. Automaton has 2861 states and 3627 transitions. Word has length 76 [2021-11-25 18:50:29,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:50:29,728 INFO L470 AbstractCegarLoop]: Abstraction has 2861 states and 3627 transitions. [2021-11-25 18:50:29,729 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-25 18:50:29,729 INFO L276 IsEmpty]: Start isEmpty. Operand 2861 states and 3627 transitions. [2021-11-25 18:50:29,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-25 18:50:29,732 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:50:29,732 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:50:29,732 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-11-25 18:50:29,733 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:50:29,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:50:29,733 INFO L85 PathProgramCache]: Analyzing trace with hash 2093816179, now seen corresponding path program 1 times [2021-11-25 18:50:29,733 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:50:29,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [340799283] [2021-11-25 18:50:29,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:50:29,734 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:50:29,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:50:29,787 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 18:50:29,788 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:50:29,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [340799283] [2021-11-25 18:50:29,788 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [340799283] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:50:29,788 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:50:29,788 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:50:29,789 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704551511] [2021-11-25 18:50:29,789 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:50:29,789 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:50:29,789 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:50:29,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:50:29,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:50:29,790 INFO L87 Difference]: Start difference. First operand 2861 states and 3627 transitions. Second operand has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-25 18:50:30,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:50:30,182 INFO L93 Difference]: Finished difference Result 5323 states and 6851 transitions. [2021-11-25 18:50:30,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:50:30,183 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 77 [2021-11-25 18:50:30,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:50:30,200 INFO L225 Difference]: With dead ends: 5323 [2021-11-25 18:50:30,200 INFO L226 Difference]: Without dead ends: 2591 [2021-11-25 18:50:30,207 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:50:30,208 INFO L933 BasicCegarLoop]: 236 mSDtfsCounter, 212 mSDsluCounter, 424 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 237 SdHoareTripleChecker+Valid, 644 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:50:30,209 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [237 Valid, 644 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:50:30,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2591 states. [2021-11-25 18:50:30,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2591 to 2336. [2021-11-25 18:50:30,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2336 states, 1719 states have (on average 1.2739965095986039) internal successors, (2190), 1738 states have internal predecessors, (2190), 389 states have call successors, (389), 227 states have call predecessors, (389), 227 states have return successors, (389), 370 states have call predecessors, (389), 389 states have call successors, (389) [2021-11-25 18:50:30,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2336 states to 2336 states and 2968 transitions. [2021-11-25 18:50:30,479 INFO L78 Accepts]: Start accepts. Automaton has 2336 states and 2968 transitions. Word has length 77 [2021-11-25 18:50:30,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:50:30,480 INFO L470 AbstractCegarLoop]: Abstraction has 2336 states and 2968 transitions. [2021-11-25 18:50:30,480 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-25 18:50:30,480 INFO L276 IsEmpty]: Start isEmpty. Operand 2336 states and 2968 transitions. [2021-11-25 18:50:30,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-25 18:50:30,482 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:50:30,482 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:50:30,483 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-11-25 18:50:30,483 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:50:30,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:50:30,483 INFO L85 PathProgramCache]: Analyzing trace with hash -1771659663, now seen corresponding path program 1 times [2021-11-25 18:50:30,484 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:50:30,484 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [928524342] [2021-11-25 18:50:30,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:50:30,484 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:50:30,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:50:30,516 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 18:50:30,517 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:50:30,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [928524342] [2021-11-25 18:50:30,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [928524342] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:50:30,517 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:50:30,517 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:50:30,517 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665221291] [2021-11-25 18:50:30,518 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:50:30,518 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:50:30,518 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:50:30,519 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:50:30,519 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:50:30,519 INFO L87 Difference]: Start difference. First operand 2336 states and 2968 transitions. Second operand has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-25 18:50:30,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:50:30,922 INFO L93 Difference]: Finished difference Result 4910 states and 6449 transitions. [2021-11-25 18:50:30,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:50:30,923 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 78 [2021-11-25 18:50:30,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:50:30,943 INFO L225 Difference]: With dead ends: 4910 [2021-11-25 18:50:30,943 INFO L226 Difference]: Without dead ends: 2886 [2021-11-25 18:50:30,948 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 [2021-11-25 18:50:30,949 INFO L933 BasicCegarLoop]: 325 mSDtfsCounter, 111 mSDsluCounter, 183 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 506 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:50:30,949 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 506 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:50:30,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2886 states. [2021-11-25 18:50:31,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2886 to 2341. [2021-11-25 18:50:31,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2341 states, 1724 states have (on average 1.273201856148492) internal successors, (2195), 1743 states have internal predecessors, (2195), 389 states have call successors, (389), 227 states have call predecessors, (389), 227 states have return successors, (389), 370 states have call predecessors, (389), 389 states have call successors, (389) [2021-11-25 18:50:31,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2341 states to 2341 states and 2973 transitions. [2021-11-25 18:50:31,197 INFO L78 Accepts]: Start accepts. Automaton has 2341 states and 2973 transitions. Word has length 78 [2021-11-25 18:50:31,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:50:31,197 INFO L470 AbstractCegarLoop]: Abstraction has 2341 states and 2973 transitions. [2021-11-25 18:50:31,197 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-25 18:50:31,197 INFO L276 IsEmpty]: Start isEmpty. Operand 2341 states and 2973 transitions. [2021-11-25 18:50:31,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-25 18:50:31,199 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:50:31,200 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:50:31,200 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-11-25 18:50:31,200 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:50:31,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:50:31,201 INFO L85 PathProgramCache]: Analyzing trace with hash -1115837418, now seen corresponding path program 1 times [2021-11-25 18:50:31,201 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:50:31,201 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [39973462] [2021-11-25 18:50:31,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:50:31,201 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:50:31,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:50:31,259 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 18:50:31,259 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:50:31,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [39973462] [2021-11-25 18:50:31,259 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [39973462] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:50:31,259 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:50:31,260 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:50:31,260 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [691227016] [2021-11-25 18:50:31,260 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:50:31,260 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:50:31,260 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:50:31,261 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:50:31,261 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:50:31,261 INFO L87 Difference]: Start difference. First operand 2341 states and 2973 transitions. Second operand has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-25 18:50:31,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:50:31,592 INFO L93 Difference]: Finished difference Result 4668 states and 6073 transitions. [2021-11-25 18:50:31,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:50:31,593 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 78 [2021-11-25 18:50:31,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:50:31,607 INFO L225 Difference]: With dead ends: 4668 [2021-11-25 18:50:31,607 INFO L226 Difference]: Without dead ends: 2587 [2021-11-25 18:50:31,613 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:50:31,614 INFO L933 BasicCegarLoop]: 233 mSDtfsCounter, 169 mSDsluCounter, 427 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 194 SdHoareTripleChecker+Valid, 642 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:50:31,614 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [194 Valid, 642 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:50:31,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2587 states. [2021-11-25 18:50:31,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2587 to 2156. [2021-11-25 18:50:31,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2156 states, 1583 states have (on average 1.268477574226153) internal successors, (2008), 1598 states have internal predecessors, (2008), 361 states have call successors, (361), 211 states have call predecessors, (361), 211 states have return successors, (361), 346 states have call predecessors, (361), 361 states have call successors, (361) [2021-11-25 18:50:31,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2156 states to 2156 states and 2730 transitions. [2021-11-25 18:50:31,930 INFO L78 Accepts]: Start accepts. Automaton has 2156 states and 2730 transitions. Word has length 78 [2021-11-25 18:50:31,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:50:31,930 INFO L470 AbstractCegarLoop]: Abstraction has 2156 states and 2730 transitions. [2021-11-25 18:50:31,931 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-25 18:50:31,931 INFO L276 IsEmpty]: Start isEmpty. Operand 2156 states and 2730 transitions. [2021-11-25 18:50:31,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-25 18:50:31,934 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:50:31,934 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 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] [2021-11-25 18:50:31,934 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-11-25 18:50:31,935 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:50:31,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:50:31,935 INFO L85 PathProgramCache]: Analyzing trace with hash 632192982, now seen corresponding path program 1 times [2021-11-25 18:50:31,935 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:50:31,936 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1294078731] [2021-11-25 18:50:31,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:50:31,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:50:31,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:50:32,008 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-11-25 18:50:32,008 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:50:32,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1294078731] [2021-11-25 18:50:32,009 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1294078731] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:50:32,009 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:50:32,009 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:50:32,009 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112016900] [2021-11-25 18:50:32,009 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:50:32,010 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:50:32,010 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:50:32,010 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:50:32,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:50:32,011 INFO L87 Difference]: Start difference. First operand 2156 states and 2730 transitions. Second operand has 4 states, 4 states have (on average 13.5) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (12), 3 states have call predecessors, (12), 1 states have return successors, (10), 1 states have call predecessors, (10), 1 states have call successors, (10) [2021-11-25 18:50:32,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:50:32,226 INFO L93 Difference]: Finished difference Result 3998 states and 5096 transitions. [2021-11-25 18:50:32,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:50:32,238 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.5) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (12), 3 states have call predecessors, (12), 1 states have return successors, (10), 1 states have call predecessors, (10), 1 states have call successors, (10) Word has length 93 [2021-11-25 18:50:32,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:50:32,248 INFO L225 Difference]: With dead ends: 3998 [2021-11-25 18:50:32,249 INFO L226 Difference]: Without dead ends: 2126 [2021-11-25 18:50:32,254 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:50:32,254 INFO L933 BasicCegarLoop]: 202 mSDtfsCounter, 7 mSDsluCounter, 412 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 592 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:50:32,255 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 592 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:50:32,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2126 states. [2021-11-25 18:50:32,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2126 to 2051. [2021-11-25 18:50:32,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2051 states, 1514 states have (on average 1.239101717305152) internal successors, (1876), 1529 states have internal predecessors, (1876), 334 states have call successors, (334), 202 states have call predecessors, (334), 202 states have return successors, (334), 319 states have call predecessors, (334), 334 states have call successors, (334) [2021-11-25 18:50:32,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2051 states to 2051 states and 2544 transitions. [2021-11-25 18:50:32,503 INFO L78 Accepts]: Start accepts. Automaton has 2051 states and 2544 transitions. Word has length 93 [2021-11-25 18:50:32,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:50:32,503 INFO L470 AbstractCegarLoop]: Abstraction has 2051 states and 2544 transitions. [2021-11-25 18:50:32,504 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.5) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (12), 3 states have call predecessors, (12), 1 states have return successors, (10), 1 states have call predecessors, (10), 1 states have call successors, (10) [2021-11-25 18:50:32,504 INFO L276 IsEmpty]: Start isEmpty. Operand 2051 states and 2544 transitions. [2021-11-25 18:50:32,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-25 18:50:32,507 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:50:32,507 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 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] [2021-11-25 18:50:32,508 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-11-25 18:50:32,508 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:50:32,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:50:32,508 INFO L85 PathProgramCache]: Analyzing trace with hash 1457482290, now seen corresponding path program 1 times [2021-11-25 18:50:32,509 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:50:32,509 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1287623289] [2021-11-25 18:50:32,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:50:32,509 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:50:32,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:50:32,600 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-25 18:50:32,601 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:50:32,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1287623289] [2021-11-25 18:50:32,601 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1287623289] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:50:32,601 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:50:32,601 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:50:32,601 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607954263] [2021-11-25 18:50:32,602 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:50:32,602 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:50:32,602 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:50:32,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:50:32,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:50:32,603 INFO L87 Difference]: Start difference. First operand 2051 states and 2544 transitions. Second operand has 4 states, 4 states have (on average 15.75) internal successors, (63), 3 states have internal predecessors, (63), 2 states have call successors, (14), 3 states have call predecessors, (14), 1 states have return successors, (12), 1 states have call predecessors, (12), 1 states have call successors, (12) [2021-11-25 18:50:32,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:50:32,838 INFO L93 Difference]: Finished difference Result 3755 states and 4691 transitions. [2021-11-25 18:50:32,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:50:32,838 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.75) internal successors, (63), 3 states have internal predecessors, (63), 2 states have call successors, (14), 3 states have call predecessors, (14), 1 states have return successors, (12), 1 states have call predecessors, (12), 1 states have call successors, (12) Word has length 109 [2021-11-25 18:50:32,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:50:32,846 INFO L225 Difference]: With dead ends: 3755 [2021-11-25 18:50:32,847 INFO L226 Difference]: Without dead ends: 2015 [2021-11-25 18:50:32,851 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 18:50:32,851 INFO L933 BasicCegarLoop]: 199 mSDtfsCounter, 6 mSDsluCounter, 406 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 583 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:50:32,852 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 583 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:50:32,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2015 states. [2021-11-25 18:50:33,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2015 to 1921. [2021-11-25 18:50:33,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1921 states, 1418 states have (on average 1.2136812411847673) internal successors, (1721), 1433 states have internal predecessors, (1721), 311 states have call successors, (311), 191 states have call predecessors, (311), 191 states have return successors, (311), 296 states have call predecessors, (311), 311 states have call successors, (311) [2021-11-25 18:50:33,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1921 states to 1921 states and 2343 transitions. [2021-11-25 18:50:33,078 INFO L78 Accepts]: Start accepts. Automaton has 1921 states and 2343 transitions. Word has length 109 [2021-11-25 18:50:33,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:50:33,079 INFO L470 AbstractCegarLoop]: Abstraction has 1921 states and 2343 transitions. [2021-11-25 18:50:33,079 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.75) internal successors, (63), 3 states have internal predecessors, (63), 2 states have call successors, (14), 3 states have call predecessors, (14), 1 states have return successors, (12), 1 states have call predecessors, (12), 1 states have call successors, (12) [2021-11-25 18:50:33,080 INFO L276 IsEmpty]: Start isEmpty. Operand 1921 states and 2343 transitions. [2021-11-25 18:50:33,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-11-25 18:50:33,084 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:50:33,084 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:50:33,085 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-11-25 18:50:33,085 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:50:33,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:50:33,085 INFO L85 PathProgramCache]: Analyzing trace with hash -1809589583, now seen corresponding path program 1 times [2021-11-25 18:50:33,085 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:50:33,086 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [576779415] [2021-11-25 18:50:33,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:50:33,086 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:50:33,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:50:33,304 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2021-11-25 18:50:33,304 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:50:33,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [576779415] [2021-11-25 18:50:33,304 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [576779415] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:50:33,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [691020225] [2021-11-25 18:50:33,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:50:33,304 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:50:33,305 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:50:33,310 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:50:33,326 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 18:50:33,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:50:33,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 529 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 18:50:33,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:50:33,728 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 42 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 18:50:33,729 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:50:33,729 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [691020225] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:50:33,729 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:50:33,729 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [8] total 11 [2021-11-25 18:50:33,729 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144417122] [2021-11-25 18:50:33,729 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:50:33,730 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 18:50:33,730 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:50:33,730 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 18:50:33,730 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-25 18:50:33,730 INFO L87 Difference]: Start difference. First operand 1921 states and 2343 transitions. Second operand has 9 states, 9 states have (on average 8.666666666666666) internal successors, (78), 7 states have internal predecessors, (78), 3 states have call successors, (15), 3 states have call predecessors, (15), 4 states have return successors, (14), 4 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-25 18:50:34,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:50:34,548 INFO L93 Difference]: Finished difference Result 5030 states and 6200 transitions. [2021-11-25 18:50:34,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 18:50:34,549 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 8.666666666666666) internal successors, (78), 7 states have internal predecessors, (78), 3 states have call successors, (15), 3 states have call predecessors, (15), 4 states have return successors, (14), 4 states have call predecessors, (14), 3 states have call successors, (14) Word has length 119 [2021-11-25 18:50:34,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:50:34,564 INFO L225 Difference]: With dead ends: 5030 [2021-11-25 18:50:34,564 INFO L226 Difference]: Without dead ends: 3276 [2021-11-25 18:50:34,568 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 118 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=155, Unknown=0, NotChecked=0, Total=210 [2021-11-25 18:50:34,568 INFO L933 BasicCegarLoop]: 231 mSDtfsCounter, 261 mSDsluCounter, 1231 mSDsCounter, 0 mSdLazyCounter, 380 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 277 SdHoareTripleChecker+Valid, 1376 SdHoareTripleChecker+Invalid, 448 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 380 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:50:34,569 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [277 Valid, 1376 Invalid, 448 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 380 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:50:34,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3276 states. [2021-11-25 18:50:34,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3276 to 2148. [2021-11-25 18:50:34,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2148 states, 1584 states have (on average 1.2039141414141414) internal successors, (1907), 1603 states have internal predecessors, (1907), 343 states have call successors, (343), 220 states have call predecessors, (343), 220 states have return successors, (343), 324 states have call predecessors, (343), 343 states have call successors, (343) [2021-11-25 18:50:34,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2148 states to 2148 states and 2593 transitions. [2021-11-25 18:50:34,853 INFO L78 Accepts]: Start accepts. Automaton has 2148 states and 2593 transitions. Word has length 119 [2021-11-25 18:50:34,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:50:34,854 INFO L470 AbstractCegarLoop]: Abstraction has 2148 states and 2593 transitions. [2021-11-25 18:50:34,854 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 8.666666666666666) internal successors, (78), 7 states have internal predecessors, (78), 3 states have call successors, (15), 3 states have call predecessors, (15), 4 states have return successors, (14), 4 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-25 18:50:34,854 INFO L276 IsEmpty]: Start isEmpty. Operand 2148 states and 2593 transitions. [2021-11-25 18:50:34,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-25 18:50:34,858 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:50:34,859 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-25 18:50:34,898 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 18:50:35,086 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-25 18:50:35,087 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:50:35,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:50:35,087 INFO L85 PathProgramCache]: Analyzing trace with hash 1336879329, now seen corresponding path program 1 times [2021-11-25 18:50:35,087 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:50:35,087 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1178826112] [2021-11-25 18:50:35,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:50:35,088 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:50:35,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:50:35,609 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-11-25 18:50:35,609 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:50:35,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1178826112] [2021-11-25 18:50:35,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1178826112] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:50:35,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1316366685] [2021-11-25 18:50:35,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:50:35,609 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:50:35,610 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:50:35,614 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:50:35,633 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 18:50:35,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:50:35,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 548 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 18:50:35,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:50:36,166 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 18 proven. 1 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-25 18:50:36,167 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:50:36,444 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-25 18:50:36,444 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1316366685] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:50:36,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [317931903] [2021-11-25 18:50:36,448 INFO L159 IcfgInterpreter]: Started Sifa with 83 locations of interest [2021-11-25 18:50:36,448 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:50:36,449 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:50:36,449 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:50:36,450 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:50:52,576 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 162 for LOIs [2021-11-25 18:50:55,390 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-25 18:50:55,393 INFO L197 IcfgInterpreter]: Interpreting procedure read_side1_failed_history with input of size 22 for LOIs [2021-11-25 18:50:55,425 INFO L197 IcfgInterpreter]: Interpreting procedure assert with input of size 31 for LOIs [2021-11-25 18:50:55,437 INFO L197 IcfgInterpreter]: Interpreting procedure read_side2_failed_history with input of size 22 for LOIs [2021-11-25 18:50:55,457 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 35 for LOIs [2021-11-25 18:50:55,492 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:51:15,103 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '125756#(and (= (mod ~side2Failed_History_1~0 256) (mod ~side2Failed_History_2~0 256)) (= |assert_#in~arg| 0) (<= ~manual_selection_History_1~0 127) (<= 0 ~active_side_History_0~0) (= assert_~arg |assert_#in~arg|) (= (mod ~side2Failed_History_1~0 256) 0) (= (mod ~side1Failed_History_2~0 256) (mod ~side1Failed_History_1~0 256)) (<= ~active_side_History_0~0 2) (= ~manual_selection_History_2~0 0) (not (= ~manual_selection_History_1~0 0)) (<= 0 (+ ~manual_selection_History_1~0 128)) (= (mod ~side1Failed_History_1~0 256) 0))' at error location [2021-11-25 18:51:15,103 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:51:15,104 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:51:15,104 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 9, 9] total 27 [2021-11-25 18:51:15,104 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1488075500] [2021-11-25 18:51:15,104 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:51:15,108 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-25 18:51:15,108 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:51:15,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-25 18:51:15,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=7522, Unknown=0, NotChecked=0, Total=8190 [2021-11-25 18:51:15,112 INFO L87 Difference]: Start difference. First operand 2148 states and 2593 transitions. Second operand has 27 states, 21 states have (on average 6.238095238095238) internal successors, (131), 23 states have internal predecessors, (131), 8 states have call successors, (38), 3 states have call predecessors, (38), 10 states have return successors, (37), 10 states have call predecessors, (37), 8 states have call successors, (37) [2021-11-25 18:51:17,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:51:17,551 INFO L93 Difference]: Finished difference Result 6034 states and 8040 transitions. [2021-11-25 18:51:17,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 18:51:17,551 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 21 states have (on average 6.238095238095238) internal successors, (131), 23 states have internal predecessors, (131), 8 states have call successors, (38), 3 states have call predecessors, (38), 10 states have return successors, (37), 10 states have call predecessors, (37), 8 states have call successors, (37) Word has length 127 [2021-11-25 18:51:17,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:51:17,572 INFO L225 Difference]: With dead ends: 6034 [2021-11-25 18:51:17,572 INFO L226 Difference]: Without dead ends: 4042 [2021-11-25 18:51:17,580 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 407 GetRequests, 295 SyntacticMatches, 13 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3333 ImplicationChecksByTransitivity, 20.3s TimeCoverageRelationStatistics Valid=734, Invalid=9366, Unknown=0, NotChecked=0, Total=10100 [2021-11-25 18:51:17,581 INFO L933 BasicCegarLoop]: 673 mSDtfsCounter, 502 mSDsluCounter, 10220 mSDsCounter, 0 mSdLazyCounter, 1969 mSolverCounterSat, 209 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 552 SdHoareTripleChecker+Valid, 10327 SdHoareTripleChecker+Invalid, 2178 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 209 IncrementalHoareTripleChecker+Valid, 1969 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:51:17,582 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [552 Valid, 10327 Invalid, 2178 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [209 Valid, 1969 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-25 18:51:17,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4042 states. [2021-11-25 18:51:17,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4042 to 2148. [2021-11-25 18:51:17,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2148 states, 1584 states have (on average 1.2026515151515151) internal successors, (1905), 1603 states have internal predecessors, (1905), 343 states have call successors, (343), 220 states have call predecessors, (343), 220 states have return successors, (343), 324 states have call predecessors, (343), 343 states have call successors, (343) [2021-11-25 18:51:17,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2148 states to 2148 states and 2591 transitions. [2021-11-25 18:51:17,893 INFO L78 Accepts]: Start accepts. Automaton has 2148 states and 2591 transitions. Word has length 127 [2021-11-25 18:51:17,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:51:17,893 INFO L470 AbstractCegarLoop]: Abstraction has 2148 states and 2591 transitions. [2021-11-25 18:51:17,894 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 21 states have (on average 6.238095238095238) internal successors, (131), 23 states have internal predecessors, (131), 8 states have call successors, (38), 3 states have call predecessors, (38), 10 states have return successors, (37), 10 states have call predecessors, (37), 8 states have call successors, (37) [2021-11-25 18:51:17,894 INFO L276 IsEmpty]: Start isEmpty. Operand 2148 states and 2591 transitions. [2021-11-25 18:51:17,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-25 18:51:17,898 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:51:17,898 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 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] [2021-11-25 18:51:17,926 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 18:51:18,110 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-25 18:51:18,111 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:51:18,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:51:18,111 INFO L85 PathProgramCache]: Analyzing trace with hash 780204592, now seen corresponding path program 1 times [2021-11-25 18:51:18,111 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:51:18,111 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2103634365] [2021-11-25 18:51:18,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:51:18,112 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:51:18,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:51:18,288 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2021-11-25 18:51:18,288 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:51:18,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2103634365] [2021-11-25 18:51:18,289 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2103634365] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:51:18,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [431139532] [2021-11-25 18:51:18,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:51:18,289 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:51:18,290 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:51:18,290 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:51:18,313 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 18:51:18,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:51:18,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 566 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 18:51:18,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:51:18,691 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 52 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 18:51:18,692 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:51:18,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [431139532] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:51:18,692 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:51:18,692 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [8] total 11 [2021-11-25 18:51:18,692 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724341150] [2021-11-25 18:51:18,693 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:51:18,693 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 18:51:18,693 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:51:18,694 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 18:51:18,694 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-25 18:51:18,694 INFO L87 Difference]: Start difference. First operand 2148 states and 2591 transitions. Second operand has 9 states, 9 states have (on average 9.11111111111111) internal successors, (82), 7 states have internal predecessors, (82), 3 states have call successors, (17), 3 states have call predecessors, (17), 4 states have return successors, (16), 4 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-25 18:51:19,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:51:19,659 INFO L93 Difference]: Finished difference Result 6140 states and 7764 transitions. [2021-11-25 18:51:19,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 18:51:19,660 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 9.11111111111111) internal successors, (82), 7 states have internal predecessors, (82), 3 states have call successors, (17), 3 states have call predecessors, (17), 4 states have return successors, (16), 4 states have call predecessors, (16), 3 states have call successors, (16) Word has length 135 [2021-11-25 18:51:19,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:51:19,671 INFO L225 Difference]: With dead ends: 6140 [2021-11-25 18:51:19,672 INFO L226 Difference]: Without dead ends: 4142 [2021-11-25 18:51:19,676 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 133 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=155, Unknown=0, NotChecked=0, Total=210 [2021-11-25 18:51:19,677 INFO L933 BasicCegarLoop]: 411 mSDtfsCounter, 289 mSDsluCounter, 2088 mSDsCounter, 0 mSdLazyCounter, 505 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 325 SdHoareTripleChecker+Valid, 2412 SdHoareTripleChecker+Invalid, 592 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 505 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 18:51:19,677 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [325 Valid, 2412 Invalid, 592 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 505 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 18:51:19,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4142 states. [2021-11-25 18:51:20,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4142 to 2908. [2021-11-25 18:51:20,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2908 states, 2136 states have (on average 1.192883895131086) internal successors, (2548), 2163 states have internal predecessors, (2548), 471 states have call successors, (471), 300 states have call predecessors, (471), 300 states have return successors, (471), 444 states have call predecessors, (471), 471 states have call successors, (471) [2021-11-25 18:51:20,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2908 states to 2908 states and 3490 transitions. [2021-11-25 18:51:20,094 INFO L78 Accepts]: Start accepts. Automaton has 2908 states and 3490 transitions. Word has length 135 [2021-11-25 18:51:20,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:51:20,094 INFO L470 AbstractCegarLoop]: Abstraction has 2908 states and 3490 transitions. [2021-11-25 18:51:20,094 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 9.11111111111111) internal successors, (82), 7 states have internal predecessors, (82), 3 states have call successors, (17), 3 states have call predecessors, (17), 4 states have return successors, (16), 4 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-25 18:51:20,095 INFO L276 IsEmpty]: Start isEmpty. Operand 2908 states and 3490 transitions. [2021-11-25 18:51:20,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-11-25 18:51:20,099 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:51:20,100 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 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] [2021-11-25 18:51:20,138 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 18:51:20,314 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:51:20,315 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:51:20,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:51:20,315 INFO L85 PathProgramCache]: Analyzing trace with hash -1205422434, now seen corresponding path program 1 times [2021-11-25 18:51:20,315 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:51:20,315 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1871810883] [2021-11-25 18:51:20,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:51:20,315 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:51:20,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:51:22,007 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 14 proven. 21 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2021-11-25 18:51:22,007 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:51:22,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1871810883] [2021-11-25 18:51:22,008 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1871810883] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:51:22,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [473136661] [2021-11-25 18:51:22,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:51:22,008 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:51:22,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:51:22,009 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:51:22,009 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 18:51:22,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:51:22,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 583 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-25 18:51:22,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:51:22,946 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 71 proven. 5 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-11-25 18:51:22,946 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:51:23,690 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2021-11-25 18:51:23,690 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [473136661] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:51:23,690 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [475638055] [2021-11-25 18:51:23,694 INFO L159 IcfgInterpreter]: Started Sifa with 89 locations of interest [2021-11-25 18:51:23,694 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:51:23,695 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:51:23,695 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:51:23,695 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:51:30,878 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 74 for LOIs [2021-11-25 18:51:30,976 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 108 for LOIs [2021-11-25 18:51:30,988 INFO L197 IcfgInterpreter]: Interpreting procedure read_side1_failed_history with input of size 104 for LOIs [2021-11-25 18:51:31,129 INFO L197 IcfgInterpreter]: Interpreting procedure assert with input of size 109 for LOIs [2021-11-25 18:51:31,166 INFO L197 IcfgInterpreter]: Interpreting procedure read_side2_failed_history with input of size 112 for LOIs [2021-11-25 18:51:31,343 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 120 for LOIs [2021-11-25 18:51:31,724 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:52:21,274 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '149694#(and (<= ~active_side_History_0~0 0) (<= 0 (+ ~manual_selection_History_0~0 128)) (<= ~s1p~0 0) (<= ~cs2~0 0) (<= 0 |#NULL.base|) (<= 0 (+ ~s1s1_new~0 1)) (<= 0 (+ 2 ~active_side_History_1~0)) (<= 0 (+ ~s2s2_new~0 1)) (<= ~s2s1~0 0) (<= ~s2s2~0 0) (<= 0 (+ ~s2s1_new~0 1)) (<= (+ ~s1p_new~0 1) 0) (<= 0 ~s1s1~0) (= (mod ~side2Failed_History_1~0 256) (mod ~side2Failed_History_2~0 256)) (<= 0 ~cs2~0) (<= ~manual_selection_History_0~0 127) (= ~manual_selection_History_1~0 0) (<= 0 (+ ~s2p_new~0 1)) (= |assert_#in~arg| 0) (<= 0 ~side2_written~0) (<= ~s1s2~0 0) (<= 0 ~s2p~0) (<= ~s2p~0 0) (<= 0 ~cs1~0) (<= 0 ~s1p~0) (<= 0 (+ ~s1s2_new~0 1)) (<= |#NULL.offset| 0) (<= 0 ~active_side_History_0~0) (= assert_~arg |assert_#in~arg|) (<= (+ ~cs2_new~0 1) 0) (<= (+ ~s1s2_new~0 1) 0) (<= 0 (+ ~s1p_new~0 1)) (<= (+ 2 ~active_side_History_2~0) 0) (<= (+ ~s2s1_new~0 1) 0) (= (mod ~side2Failed_History_1~0 256) 0) (= ~manual_selection_History_2~0 0) (<= ~cs1~0 0) (<= 0 ~s2s2~0) (<= (+ ~nomsg~0 1) 0) (<= |#NULL.base| 0) (<= 0 (+ ~cs1_new~0 1)) (<= (+ 2 ~active_side_History_1~0) 0) (<= (+ ~cs1_new~0 1) 0) (<= 0 (+ ~nomsg~0 1)) (<= 0 (+ 2 ~active_side_History_2~0)) (<= 0 (+ ~side1_written~0 1)) (<= ~side2_written~0 0) (<= 0 ~s1s2~0) (<= ~s1s1~0 0) (<= 0 ~s2s1~0) (<= 0 |#NULL.offset|) (<= 0 (+ ~cs2_new~0 1)) (<= (+ ~side1_written~0 1) 0) (<= 0 |#StackHeapBarrier|) (<= (+ ~s2p_new~0 1) 0) (<= (+ ~s2s2_new~0 1) 0) (<= (+ ~s1s1_new~0 1) 0))' at error location [2021-11-25 18:52:21,274 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:52:21,274 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:52:21,275 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 14, 14] total 55 [2021-11-25 18:52:21,275 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212076261] [2021-11-25 18:52:21,275 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:52:21,276 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-25 18:52:21,276 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:52:21,276 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-25 18:52:21,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2047, Invalid=10385, Unknown=0, NotChecked=0, Total=12432 [2021-11-25 18:52:21,281 INFO L87 Difference]: Start difference. First operand 2908 states and 3490 transitions. Second operand has 55 states, 43 states have (on average 4.3023255813953485) internal successors, (185), 44 states have internal predecessors, (185), 18 states have call successors, (50), 5 states have call predecessors, (50), 17 states have return successors, (49), 24 states have call predecessors, (49), 18 states have call successors, (49) [2021-11-25 18:52:27,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:52:27,602 INFO L93 Difference]: Finished difference Result 8172 states and 10793 transitions. [2021-11-25 18:52:27,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-25 18:52:27,603 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 43 states have (on average 4.3023255813953485) internal successors, (185), 44 states have internal predecessors, (185), 18 states have call successors, (50), 5 states have call predecessors, (50), 17 states have return successors, (49), 24 states have call predecessors, (49), 18 states have call successors, (49) Word has length 142 [2021-11-25 18:52:27,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:52:27,622 INFO L225 Difference]: With dead ends: 8172 [2021-11-25 18:52:27,623 INFO L226 Difference]: Without dead ends: 5449 [2021-11-25 18:52:27,634 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 337 SyntacticMatches, 15 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6178 ImplicationChecksByTransitivity, 52.5s TimeCoverageRelationStatistics Valid=2523, Invalid=16659, Unknown=0, NotChecked=0, Total=19182 [2021-11-25 18:52:27,636 INFO L933 BasicCegarLoop]: 435 mSDtfsCounter, 954 mSDsluCounter, 12561 mSDsCounter, 0 mSdLazyCounter, 5687 mSolverCounterSat, 230 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1010 SdHoareTripleChecker+Valid, 12262 SdHoareTripleChecker+Invalid, 5917 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 230 IncrementalHoareTripleChecker+Valid, 5687 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:52:27,637 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1010 Valid, 12262 Invalid, 5917 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [230 Valid, 5687 Invalid, 0 Unknown, 0 Unchecked, 4.3s Time] [2021-11-25 18:52:27,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5449 states. [2021-11-25 18:52:28,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5449 to 2879. [2021-11-25 18:52:28,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2879 states, 2115 states have (on average 1.1933806146572103) internal successors, (2524), 2141 states have internal predecessors, (2524), 466 states have call successors, (466), 297 states have call predecessors, (466), 297 states have return successors, (466), 440 states have call predecessors, (466), 466 states have call successors, (466) [2021-11-25 18:52:28,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2879 states to 2879 states and 3456 transitions. [2021-11-25 18:52:28,160 INFO L78 Accepts]: Start accepts. Automaton has 2879 states and 3456 transitions. Word has length 142 [2021-11-25 18:52:28,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:52:28,160 INFO L470 AbstractCegarLoop]: Abstraction has 2879 states and 3456 transitions. [2021-11-25 18:52:28,161 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 43 states have (on average 4.3023255813953485) internal successors, (185), 44 states have internal predecessors, (185), 18 states have call successors, (50), 5 states have call predecessors, (50), 17 states have return successors, (49), 24 states have call predecessors, (49), 18 states have call successors, (49) [2021-11-25 18:52:28,161 INFO L276 IsEmpty]: Start isEmpty. Operand 2879 states and 3456 transitions. [2021-11-25 18:52:28,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-25 18:52:28,166 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:52:28,167 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:52:28,204 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 18:52:28,394 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:52:28,395 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:52:28,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:52:28,395 INFO L85 PathProgramCache]: Analyzing trace with hash -2095281087, now seen corresponding path program 1 times [2021-11-25 18:52:28,395 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:52:28,395 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [543685758] [2021-11-25 18:52:28,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:52:28,395 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:52:28,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:52:28,556 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 12 proven. 10 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-25 18:52:28,556 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:52:28,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [543685758] [2021-11-25 18:52:28,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [543685758] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:52:28,557 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [334403142] [2021-11-25 18:52:28,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:52:28,557 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:52:28,557 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:52:28,558 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:52:28,578 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_114cb4ea-4fb4-4058-8589-00d021112230/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 18:52:28,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:52:28,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 716 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 18:52:28,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:52:29,324 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 57 proven. 20 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-25 18:52:29,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:52:29,599 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 12 proven. 10 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-25 18:52:29,600 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [334403142] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:52:29,600 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1830760218] [2021-11-25 18:52:29,603 INFO L159 IcfgInterpreter]: Started Sifa with 77 locations of interest [2021-11-25 18:52:29,603 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:52:29,604 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:52:29,604 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:52:29,604 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs