./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.4_2.ufo.BOUNDED-10.pals.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.4_2.ufo.BOUNDED-10.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash cdd691469d2e12c2dd1871c48be4dd2db0b9d27541ac5dee5ff25a04db0d98eb --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:42:34,285 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:42:34,287 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:42:34,318 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:42:34,319 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:42:34,320 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:42:34,322 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:42:34,325 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:42:34,327 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:42:34,329 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:42:34,330 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:42:34,332 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:42:34,332 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:42:34,334 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:42:34,335 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:42:34,337 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:42:34,338 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:42:34,340 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:42:34,342 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:42:34,345 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:42:34,348 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:42:34,349 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:42:34,351 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:42:34,352 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:42:34,356 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:42:34,357 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:42:34,357 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:42:34,358 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:42:34,359 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:42:34,360 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:42:34,361 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:42:34,362 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:42:34,363 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:42:34,364 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:42:34,365 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:42:34,366 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:42:34,366 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:42:34,367 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:42:34,367 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:42:34,368 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:42:34,369 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:42:34,370 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 03:42:34,398 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:42:34,399 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:42:34,399 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:42:34,399 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:42:34,400 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:42:34,401 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:42:34,401 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:42:34,401 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:42:34,402 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:42:34,402 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:42:34,402 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:42:34,403 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:42:34,403 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:42:34,403 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:42:34,404 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:42:34,404 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:42:34,404 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:42:34,405 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:42:34,406 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:42:34,406 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:42:34,406 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:42:34,407 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:42:34,407 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:42:34,407 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 03:42:34,408 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:42:34,411 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 03:42:34,413 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:42:34,413 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 03:42:34,414 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:42:34,414 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 03:42:34,415 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:42:34,415 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:42:34,415 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:42:34,415 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:42:34,415 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:42:34,416 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 03:42:34,417 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:42:34,417 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:42:34,418 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 03:42:34,418 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:42:34,418 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:42:34,418 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_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cdd691469d2e12c2dd1871c48be4dd2db0b9d27541ac5dee5ff25a04db0d98eb [2021-11-23 03:42:34,687 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:42:34,708 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:42:34,711 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:42:34,712 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:42:34,713 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:42:34,714 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.4_2.ufo.BOUNDED-10.pals.c [2021-11-23 03:42:34,792 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/data/a7951c6e4/28e7b921fba647cf9022731c2f8fbe46/FLAG8eb7066fb [2021-11-23 03:42:35,292 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:42:35,301 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.4_2.ufo.BOUNDED-10.pals.c [2021-11-23 03:42:35,319 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/data/a7951c6e4/28e7b921fba647cf9022731c2f8fbe46/FLAG8eb7066fb [2021-11-23 03:42:35,634 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/data/a7951c6e4/28e7b921fba647cf9022731c2f8fbe46 [2021-11-23 03:42:35,636 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:42:35,638 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:42:35,639 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:42:35,644 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:42:35,648 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:42:35,649 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:42:35" (1/1) ... [2021-11-23 03:42:35,650 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@61180eb4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:42:35, skipping insertion in model container [2021-11-23 03:42:35,650 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:42:35" (1/1) ... [2021-11-23 03:42:35,658 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:42:35,695 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:42:35,953 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_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.4_2.ufo.BOUNDED-10.pals.c[14702,14715] [2021-11-23 03:42:35,956 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:42:35,964 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:42:36,026 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_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.4_2.ufo.BOUNDED-10.pals.c[14702,14715] [2021-11-23 03:42:36,026 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:42:36,042 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:42:36,042 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:42:36 WrapperNode [2021-11-23 03:42:36,043 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:42:36,044 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:42:36,044 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:42:36,044 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:42:36,052 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:42:36" (1/1) ... [2021-11-23 03:42:36,066 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:42:36" (1/1) ... [2021-11-23 03:42:36,114 INFO L137 Inliner]: procedures = 32, calls = 48, calls flagged for inlining = 12, calls inlined = 12, statements flattened = 538 [2021-11-23 03:42:36,114 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:42:36,115 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:42:36,115 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:42:36,116 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:42:36,124 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:42:36" (1/1) ... [2021-11-23 03:42:36,124 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:42:36" (1/1) ... [2021-11-23 03:42:36,130 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:42:36" (1/1) ... [2021-11-23 03:42:36,130 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:42:36" (1/1) ... [2021-11-23 03:42:36,144 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:42:36" (1/1) ... [2021-11-23 03:42:36,152 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:42:36" (1/1) ... [2021-11-23 03:42:36,156 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:42:36" (1/1) ... [2021-11-23 03:42:36,162 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:42:36,173 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:42:36,173 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:42:36,174 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:42:36,175 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:42:36" (1/1) ... [2021-11-23 03:42:36,182 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:42:36,200 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:42:36,217 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:42:36,232 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:42:36,262 INFO L130 BoogieDeclarations]: Found specification of procedure read_manual_selection_history [2021-11-23 03:42:36,262 INFO L138 BoogieDeclarations]: Found implementation of procedure read_manual_selection_history [2021-11-23 03:42:36,262 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:42:36,263 INFO L130 BoogieDeclarations]: Found specification of procedure read_side2_failed_history [2021-11-23 03:42:36,263 INFO L138 BoogieDeclarations]: Found implementation of procedure read_side2_failed_history [2021-11-23 03:42:36,263 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2021-11-23 03:42:36,263 INFO L138 BoogieDeclarations]: Found implementation of procedure assert [2021-11-23 03:42:36,263 INFO L130 BoogieDeclarations]: Found specification of procedure flip_the_side [2021-11-23 03:42:36,263 INFO L138 BoogieDeclarations]: Found implementation of procedure flip_the_side [2021-11-23 03:42:36,264 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-23 03:42:36,264 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-23 03:42:36,264 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 03:42:36,264 INFO L130 BoogieDeclarations]: Found specification of procedure read_side1_failed_history [2021-11-23 03:42:36,264 INFO L138 BoogieDeclarations]: Found implementation of procedure read_side1_failed_history [2021-11-23 03:42:36,265 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:42:36,265 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:42:36,265 INFO L130 BoogieDeclarations]: Found specification of procedure read_active_side_history [2021-11-23 03:42:36,265 INFO L138 BoogieDeclarations]: Found implementation of procedure read_active_side_history [2021-11-23 03:42:36,415 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:42:36,417 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:42:36,988 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:42:37,246 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:42:37,246 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 03:42:37,250 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:42:37 BoogieIcfgContainer [2021-11-23 03:42:37,250 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:42:37,252 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:42:37,252 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:42:37,256 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:42:37,257 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:42:35" (1/3) ... [2021-11-23 03:42:37,257 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2df63a8d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:42:37, skipping insertion in model container [2021-11-23 03:42:37,258 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:42:36" (2/3) ... [2021-11-23 03:42:37,258 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2df63a8d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:42:37, skipping insertion in model container [2021-11-23 03:42:37,258 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:42:37" (3/3) ... [2021-11-23 03:42:37,260 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_STARTPALS_ActiveStandby.4_2.ufo.BOUNDED-10.pals.c [2021-11-23 03:42:37,270 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:42:37,270 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 03:42:37,322 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:42:37,330 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 03:42:37,330 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 03:42:37,353 INFO L276 IsEmpty]: Start isEmpty. Operand has 150 states, 110 states have (on average 1.5363636363636364) internal successors, (169), 111 states have internal predecessors, (169), 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) [2021-11-23 03:42:37,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-23 03:42:37,359 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:42:37,359 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:42:37,360 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:42:37,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:42:37,366 INFO L85 PathProgramCache]: Analyzing trace with hash 1166703025, now seen corresponding path program 1 times [2021-11-23 03:42:37,375 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:42:37,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1870706728] [2021-11-23 03:42:37,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:42:37,377 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:42:37,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:42:37,802 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:42:37,803 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:42:37,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1870706728] [2021-11-23 03:42:37,804 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1870706728] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:42:37,804 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:42:37,804 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:42:37,806 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399233131] [2021-11-23 03:42:37,806 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:42:37,811 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:42:37,811 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:42:37,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:42:37,841 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:42:37,843 INFO L87 Difference]: Start difference. First operand has 150 states, 110 states have (on average 1.5363636363636364) internal successors, (169), 111 states have internal predecessors, (169), 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) [2021-11-23 03:42:37,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:42:37,981 INFO L93 Difference]: Finished difference Result 301 states and 489 transitions. [2021-11-23 03:42:37,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:42:37,984 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 [2021-11-23 03:42:37,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:42:37,994 INFO L225 Difference]: With dead ends: 301 [2021-11-23 03:42:37,994 INFO L226 Difference]: Without dead ends: 153 [2021-11-23 03:42:38,000 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 [2021-11-23 03:42:38,003 INFO L933 BasicCegarLoop]: 212 mSDtfsCounter, 5 mSDsluCounter, 438 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 626 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:42:38,005 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 626 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:42:38,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2021-11-23 03:42:38,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 153. [2021-11-23 03:42:38,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 113 states have (on average 1.5044247787610618) internal successors, (170), 113 states have internal predecessors, (170), 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) [2021-11-23 03:42:38,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 232 transitions. [2021-11-23 03:42:38,081 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 232 transitions. Word has length 19 [2021-11-23 03:42:38,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:42:38,082 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 232 transitions. [2021-11-23 03:42:38,082 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) [2021-11-23 03:42:38,082 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 232 transitions. [2021-11-23 03:42:38,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-23 03:42:38,084 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:42:38,084 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] [2021-11-23 03:42:38,085 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 03:42:38,085 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:42:38,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:42:38,086 INFO L85 PathProgramCache]: Analyzing trace with hash -1729445324, now seen corresponding path program 1 times [2021-11-23 03:42:38,086 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:42:38,086 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1798717098] [2021-11-23 03:42:38,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:42:38,087 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:42:38,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:42:38,260 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:42:38,261 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:42:38,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1798717098] [2021-11-23 03:42:38,261 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1798717098] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:42:38,262 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:42:38,262 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 03:42:38,262 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2100393856] [2021-11-23 03:42:38,262 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:42:38,264 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:42:38,264 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:42:38,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:42:38,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:42:38,265 INFO L87 Difference]: Start difference. First operand 153 states and 232 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) [2021-11-23 03:42:38,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:42:38,589 INFO L93 Difference]: Finished difference Result 435 states and 675 transitions. [2021-11-23 03:42:38,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:42:38,590 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 [2021-11-23 03:42:38,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:42:38,594 INFO L225 Difference]: With dead ends: 435 [2021-11-23 03:42:38,594 INFO L226 Difference]: Without dead ends: 285 [2021-11-23 03:42:38,596 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 [2021-11-23 03:42:38,598 INFO L933 BasicCegarLoop]: 210 mSDtfsCounter, 569 mSDsluCounter, 391 mSDsCounter, 0 mSdLazyCounter, 176 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 569 SdHoareTripleChecker+Valid, 596 SdHoareTripleChecker+Invalid, 244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:42:38,598 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [569 Valid, 596 Invalid, 244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 176 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:42:38,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2021-11-23 03:42:38,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 187. [2021-11-23 03:42:38,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 142 states have (on average 1.5070422535211268) internal successors, (214), 142 states have internal predecessors, (214), 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) [2021-11-23 03:42:38,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 282 transitions. [2021-11-23 03:42:38,628 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 282 transitions. Word has length 30 [2021-11-23 03:42:38,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:42:38,629 INFO L470 AbstractCegarLoop]: Abstraction has 187 states and 282 transitions. [2021-11-23 03:42:38,629 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) [2021-11-23 03:42:38,630 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 282 transitions. [2021-11-23 03:42:38,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-23 03:42:38,631 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:42:38,631 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] [2021-11-23 03:42:38,632 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 03:42:38,632 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:42:38,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:42:38,633 INFO L85 PathProgramCache]: Analyzing trace with hash -1540164151, now seen corresponding path program 1 times [2021-11-23 03:42:38,633 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:42:38,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [664326601] [2021-11-23 03:42:38,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:42:38,634 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:42:38,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:42:38,717 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:42:38,717 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:42:38,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [664326601] [2021-11-23 03:42:38,718 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [664326601] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:42:38,718 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:42:38,718 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 03:42:38,718 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569546177] [2021-11-23 03:42:38,719 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:42:38,719 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:42:38,719 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:42:38,720 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:42:38,720 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:42:38,721 INFO L87 Difference]: Start difference. First operand 187 states and 282 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) [2021-11-23 03:42:39,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:42:39,001 INFO L93 Difference]: Finished difference Result 435 states and 673 transitions. [2021-11-23 03:42:39,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:42:39,001 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 [2021-11-23 03:42:39,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:42:39,005 INFO L225 Difference]: With dead ends: 435 [2021-11-23 03:42:39,005 INFO L226 Difference]: Without dead ends: 285 [2021-11-23 03:42:39,006 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 [2021-11-23 03:42:39,007 INFO L933 BasicCegarLoop]: 211 mSDtfsCounter, 565 mSDsluCounter, 393 mSDsCounter, 0 mSdLazyCounter, 172 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 565 SdHoareTripleChecker+Valid, 599 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 [2021-11-23 03:42:39,008 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [565 Valid, 599 Invalid, 240 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 172 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:42:39,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2021-11-23 03:42:39,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 187. [2021-11-23 03:42:39,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 142 states have (on average 1.5) internal successors, (213), 142 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) [2021-11-23 03:42:39,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 281 transitions. [2021-11-23 03:42:39,051 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 281 transitions. Word has length 31 [2021-11-23 03:42:39,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:42:39,052 INFO L470 AbstractCegarLoop]: Abstraction has 187 states and 281 transitions. [2021-11-23 03:42:39,052 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) [2021-11-23 03:42:39,052 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 281 transitions. [2021-11-23 03:42:39,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-23 03:42:39,056 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:42:39,057 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] [2021-11-23 03:42:39,057 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 03:42:39,058 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:42:39,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:42:39,058 INFO L85 PathProgramCache]: Analyzing trace with hash 1852556943, now seen corresponding path program 1 times [2021-11-23 03:42:39,059 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:42:39,059 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [138015949] [2021-11-23 03:42:39,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:42:39,060 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:42:39,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:42:39,190 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:42:39,191 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:42:39,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [138015949] [2021-11-23 03:42:39,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [138015949] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:42:39,192 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:42:39,192 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:42:39,192 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1751305407] [2021-11-23 03:42:39,192 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:42:39,193 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:42:39,193 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:42:39,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:42:39,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:42:39,194 INFO L87 Difference]: Start difference. First operand 187 states and 281 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) [2021-11-23 03:42:39,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:42:39,259 INFO L93 Difference]: Finished difference Result 342 states and 516 transitions. [2021-11-23 03:42:39,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:42:39,260 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 [2021-11-23 03:42:39,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:42:39,262 INFO L225 Difference]: With dead ends: 342 [2021-11-23 03:42:39,263 INFO L226 Difference]: Without dead ends: 192 [2021-11-23 03:42:39,263 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 [2021-11-23 03:42:39,265 INFO L933 BasicCegarLoop]: 214 mSDtfsCounter, 6 mSDsluCounter, 446 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 638 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 [2021-11-23 03:42:39,265 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 638 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:42:39,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2021-11-23 03:42:39,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 192. [2021-11-23 03:42:39,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 146 states have (on average 1.4863013698630136) internal successors, (217), 146 states have internal predecessors, (217), 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) [2021-11-23 03:42:39,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 285 transitions. [2021-11-23 03:42:39,282 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 285 transitions. Word has length 33 [2021-11-23 03:42:39,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:42:39,283 INFO L470 AbstractCegarLoop]: Abstraction has 192 states and 285 transitions. [2021-11-23 03:42:39,283 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) [2021-11-23 03:42:39,284 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 285 transitions. [2021-11-23 03:42:39,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 03:42:39,285 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:42:39,285 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] [2021-11-23 03:42:39,286 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 03:42:39,286 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:42:39,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:42:39,287 INFO L85 PathProgramCache]: Analyzing trace with hash 1321944341, now seen corresponding path program 1 times [2021-11-23 03:42:39,287 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:42:39,287 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1113965068] [2021-11-23 03:42:39,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:42:39,287 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:42:39,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:42:39,396 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:42:39,396 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:42:39,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1113965068] [2021-11-23 03:42:39,397 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1113965068] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:42:39,397 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:42:39,397 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:42:39,397 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1507283835] [2021-11-23 03:42:39,399 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:42:39,400 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:42:39,400 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:42:39,402 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:42:39,403 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:42:39,404 INFO L87 Difference]: Start difference. First operand 192 states and 285 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) [2021-11-23 03:42:39,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:42:39,496 INFO L93 Difference]: Finished difference Result 352 states and 527 transitions. [2021-11-23 03:42:39,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:42:39,497 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 [2021-11-23 03:42:39,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:42:39,499 INFO L225 Difference]: With dead ends: 352 [2021-11-23 03:42:39,499 INFO L226 Difference]: Without dead ends: 197 [2021-11-23 03:42:39,500 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 [2021-11-23 03:42:39,501 INFO L933 BasicCegarLoop]: 211 mSDtfsCounter, 6 mSDsluCounter, 435 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 624 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 [2021-11-23 03:42:39,502 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 624 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:42:39,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-11-23 03:42:39,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 197. [2021-11-23 03:42:39,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 197 states, 150 states have (on average 1.4733333333333334) internal successors, (221), 150 states have internal predecessors, (221), 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) [2021-11-23 03:42:39,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 289 transitions. [2021-11-23 03:42:39,517 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 289 transitions. Word has length 41 [2021-11-23 03:42:39,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:42:39,518 INFO L470 AbstractCegarLoop]: Abstraction has 197 states and 289 transitions. [2021-11-23 03:42:39,518 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) [2021-11-23 03:42:39,518 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 289 transitions. [2021-11-23 03:42:39,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-23 03:42:39,520 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:42:39,520 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] [2021-11-23 03:42:39,520 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 03:42:39,521 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:42:39,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:42:39,521 INFO L85 PathProgramCache]: Analyzing trace with hash 1907041343, now seen corresponding path program 1 times [2021-11-23 03:42:39,521 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:42:39,521 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [181909607] [2021-11-23 03:42:39,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:42:39,522 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:42:39,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:42:39,593 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:42:39,593 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:42:39,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [181909607] [2021-11-23 03:42:39,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [181909607] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:42:39,594 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:42:39,594 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:42:39,594 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1293843928] [2021-11-23 03:42:39,595 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:42:39,595 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:42:39,595 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:42:39,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:42:39,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:42:39,597 INFO L87 Difference]: Start difference. First operand 197 states and 289 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) [2021-11-23 03:42:39,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:42:39,671 INFO L93 Difference]: Finished difference Result 361 states and 531 transitions. [2021-11-23 03:42:39,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:42:39,672 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 [2021-11-23 03:42:39,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:42:39,676 INFO L225 Difference]: With dead ends: 361 [2021-11-23 03:42:39,677 INFO L226 Difference]: Without dead ends: 201 [2021-11-23 03:42:39,677 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 [2021-11-23 03:42:39,681 INFO L933 BasicCegarLoop]: 216 mSDtfsCounter, 5 mSDsluCounter, 439 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 633 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 [2021-11-23 03:42:39,684 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 633 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:42:39,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2021-11-23 03:42:39,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 201. [2021-11-23 03:42:39,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 153 states have (on average 1.4640522875816993) internal successors, (224), 153 states have internal predecessors, (224), 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) [2021-11-23 03:42:39,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 292 transitions. [2021-11-23 03:42:39,703 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 292 transitions. Word has length 49 [2021-11-23 03:42:39,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:42:39,704 INFO L470 AbstractCegarLoop]: Abstraction has 201 states and 292 transitions. [2021-11-23 03:42:39,704 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) [2021-11-23 03:42:39,704 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 292 transitions. [2021-11-23 03:42:39,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-23 03:42:39,712 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:42:39,712 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] [2021-11-23 03:42:39,712 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 03:42:39,713 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:42:39,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:42:39,714 INFO L85 PathProgramCache]: Analyzing trace with hash 8533350, now seen corresponding path program 1 times [2021-11-23 03:42:39,714 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:42:39,715 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [597749865] [2021-11-23 03:42:39,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:42:39,715 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:42:39,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:42:39,827 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:42:39,828 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:42:39,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [597749865] [2021-11-23 03:42:39,828 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [597749865] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:42:39,829 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:42:39,829 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:42:39,829 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1620870053] [2021-11-23 03:42:39,829 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:42:39,830 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:42:39,830 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:42:39,830 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:42:39,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:42:39,831 INFO L87 Difference]: Start difference. First operand 201 states and 292 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) [2021-11-23 03:42:39,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:42:39,906 INFO L93 Difference]: Finished difference Result 370 states and 541 transitions. [2021-11-23 03:42:39,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:42:39,907 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 [2021-11-23 03:42:39,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:42:39,909 INFO L225 Difference]: With dead ends: 370 [2021-11-23 03:42:39,909 INFO L226 Difference]: Without dead ends: 206 [2021-11-23 03:42:39,910 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 [2021-11-23 03:42:39,911 INFO L933 BasicCegarLoop]: 211 mSDtfsCounter, 6 mSDsluCounter, 435 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 624 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 [2021-11-23 03:42:39,911 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 624 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:42:39,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2021-11-23 03:42:39,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 206. [2021-11-23 03:42:39,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 157 states have (on average 1.4522292993630572) internal successors, (228), 157 states have internal predecessors, (228), 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) [2021-11-23 03:42:39,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 296 transitions. [2021-11-23 03:42:39,926 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 296 transitions. Word has length 49 [2021-11-23 03:42:39,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:42:39,927 INFO L470 AbstractCegarLoop]: Abstraction has 206 states and 296 transitions. [2021-11-23 03:42:39,927 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) [2021-11-23 03:42:39,927 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 296 transitions. [2021-11-23 03:42:39,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-23 03:42:39,929 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:42:39,929 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] [2021-11-23 03:42:39,929 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 03:42:39,929 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:42:39,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:42:39,930 INFO L85 PathProgramCache]: Analyzing trace with hash -311743642, now seen corresponding path program 1 times [2021-11-23 03:42:39,930 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:42:39,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2063273547] [2021-11-23 03:42:39,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:42:39,931 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:42:39,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:42:40,039 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 03:42:40,041 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:42:40,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2063273547] [2021-11-23 03:42:40,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2063273547] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:42:40,042 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:42:40,042 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:42:40,043 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2072272299] [2021-11-23 03:42:40,043 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:42:40,043 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:42:40,046 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:42:40,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:42:40,047 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:42:40,047 INFO L87 Difference]: Start difference. First operand 206 states and 296 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) [2021-11-23 03:42:40,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:42:40,114 INFO L93 Difference]: Finished difference Result 381 states and 548 transitions. [2021-11-23 03:42:40,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:42:40,121 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 [2021-11-23 03:42:40,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:42:40,126 INFO L225 Difference]: With dead ends: 381 [2021-11-23 03:42:40,127 INFO L226 Difference]: Without dead ends: 212 [2021-11-23 03:42:40,127 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 [2021-11-23 03:42:40,128 INFO L933 BasicCegarLoop]: 215 mSDtfsCounter, 7 mSDsluCounter, 442 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 635 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 [2021-11-23 03:42:40,129 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 635 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:42:40,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-11-23 03:42:40,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 212. [2021-11-23 03:42:40,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 162 states have (on average 1.4382716049382716) internal successors, (233), 162 states have internal predecessors, (233), 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) [2021-11-23 03:42:40,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 301 transitions. [2021-11-23 03:42:40,154 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 301 transitions. Word has length 57 [2021-11-23 03:42:40,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:42:40,154 INFO L470 AbstractCegarLoop]: Abstraction has 212 states and 301 transitions. [2021-11-23 03:42:40,154 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) [2021-11-23 03:42:40,155 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 301 transitions. [2021-11-23 03:42:40,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 03:42:40,157 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:42:40,157 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] [2021-11-23 03:42:40,157 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-23 03:42:40,158 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:42:40,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:42:40,158 INFO L85 PathProgramCache]: Analyzing trace with hash -71883967, now seen corresponding path program 1 times [2021-11-23 03:42:40,159 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:42:40,159 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [123861384] [2021-11-23 03:42:40,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:42:40,159 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:42:40,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:42:40,431 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 03:42:40,431 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:42:40,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [123861384] [2021-11-23 03:42:40,433 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [123861384] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:42:40,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [122641888] [2021-11-23 03:42:40,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:42:40,433 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:42:40,434 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:42:40,437 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:42:40,457 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 03:42:40,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:42:40,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 381 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 03:42:40,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:42:40,982 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:42:40,982 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:42:40,983 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [122641888] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:42:40,983 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:42:40,983 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [9] total 14 [2021-11-23 03:42:40,984 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [838575959] [2021-11-23 03:42:40,984 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:42:40,985 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 03:42:40,985 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:42:40,986 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 03:42:40,986 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2021-11-23 03:42:40,987 INFO L87 Difference]: Start difference. First operand 212 states and 301 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) [2021-11-23 03:42:41,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:42:41,256 INFO L93 Difference]: Finished difference Result 601 states and 839 transitions. [2021-11-23 03:42:41,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 03:42:41,257 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 [2021-11-23 03:42:41,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:42:41,260 INFO L225 Difference]: With dead ends: 601 [2021-11-23 03:42:41,260 INFO L226 Difference]: Without dead ends: 400 [2021-11-23 03:42:41,261 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 [2021-11-23 03:42:41,262 INFO L933 BasicCegarLoop]: 242 mSDtfsCounter, 233 mSDsluCounter, 896 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 234 SdHoareTripleChecker+Valid, 1099 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:42:41,263 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [234 Valid, 1099 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:42:41,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 400 states. [2021-11-23 03:42:41,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 400 to 396. [2021-11-23 03:42:41,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 396 states, 300 states have (on average 1.42) internal successors, (426), 301 states have internal predecessors, (426), 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) [2021-11-23 03:42:41,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 556 transitions. [2021-11-23 03:42:41,290 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 556 transitions. Word has length 60 [2021-11-23 03:42:41,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:42:41,291 INFO L470 AbstractCegarLoop]: Abstraction has 396 states and 556 transitions. [2021-11-23 03:42:41,291 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) [2021-11-23 03:42:41,291 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 556 transitions. [2021-11-23 03:42:41,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-23 03:42:41,293 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:42:41,293 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] [2021-11-23 03:42:41,331 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 03:42:41,509 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:42:41,510 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:42:41,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:42:41,510 INFO L85 PathProgramCache]: Analyzing trace with hash -399936524, now seen corresponding path program 1 times [2021-11-23 03:42:41,510 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:42:41,510 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1281614041] [2021-11-23 03:42:41,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:42:41,511 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:42:41,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:42:41,707 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 03:42:41,707 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:42:41,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1281614041] [2021-11-23 03:42:41,707 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1281614041] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:42:41,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [817425778] [2021-11-23 03:42:41,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:42:41,708 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:42:41,708 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:42:41,717 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:42:41,738 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 03:42:41,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:42:41,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 401 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 03:42:41,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:42:42,306 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:42:42,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:42:42,551 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 03:42:42,551 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [817425778] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:42:42,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [14636414] [2021-11-23 03:42:42,576 INFO L159 IcfgInterpreter]: Started Sifa with 57 locations of interest [2021-11-23 03:42:42,577 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:42:42,606 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:42:42,611 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:42:42,612 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:42:46,542 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 111 for LOIs [2021-11-23 03:42:46,745 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 108 for LOIs [2021-11-23 03:42:46,761 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 104 for LOIs [2021-11-23 03:42:46,907 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:43:00,298 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [14636414] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:43:00,298 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:43:00,298 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [9, 9, 9] total 37 [2021-11-23 03:43:00,299 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067905371] [2021-11-23 03:43:00,299 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:43:00,300 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-23 03:43:00,300 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:43:00,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-23 03:43:00,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1200, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 03:43:00,302 INFO L87 Difference]: Start difference. First operand 396 states and 556 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) [2021-11-23 03:43:05,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:43:05,909 INFO L93 Difference]: Finished difference Result 821 states and 1160 transitions. [2021-11-23 03:43:05,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 03:43:05,910 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 [2021-11-23 03:43:05,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:43:05,915 INFO L225 Difference]: With dead ends: 821 [2021-11-23 03:43:05,915 INFO L226 Difference]: Without dead ends: 465 [2021-11-23 03:43:05,917 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 154 SyntacticMatches, 4 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 337 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=155, Invalid=1405, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 03:43:05,918 INFO L933 BasicCegarLoop]: 280 mSDtfsCounter, 196 mSDsluCounter, 2357 mSDsCounter, 0 mSdLazyCounter, 1500 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 200 SdHoareTripleChecker+Valid, 2625 SdHoareTripleChecker+Invalid, 1573 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 1500 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:43:05,919 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [200 Valid, 2625 Invalid, 1573 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 1500 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2021-11-23 03:43:05,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 465 states. [2021-11-23 03:43:05,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 465 to 442. [2021-11-23 03:43:05,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 442 states, 331 states have (on average 1.3987915407854985) internal successors, (463), 332 states have internal predecessors, (463), 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) [2021-11-23 03:43:05,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 442 states to 442 states and 619 transitions. [2021-11-23 03:43:05,970 INFO L78 Accepts]: Start accepts. Automaton has 442 states and 619 transitions. Word has length 62 [2021-11-23 03:43:05,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:43:05,971 INFO L470 AbstractCegarLoop]: Abstraction has 442 states and 619 transitions. [2021-11-23 03:43:05,971 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) [2021-11-23 03:43:05,971 INFO L276 IsEmpty]: Start isEmpty. Operand 442 states and 619 transitions. [2021-11-23 03:43:05,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-23 03:43:05,973 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:43:05,973 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] [2021-11-23 03:43:06,006 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 03:43:06,188 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-23 03:43:06,189 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:43:06,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:43:06,189 INFO L85 PathProgramCache]: Analyzing trace with hash 1021702805, now seen corresponding path program 1 times [2021-11-23 03:43:06,189 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:43:06,189 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2021138393] [2021-11-23 03:43:06,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:43:06,189 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:43:06,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:43:06,359 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 03:43:06,359 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:43:06,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2021138393] [2021-11-23 03:43:06,359 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2021138393] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:43:06,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [110850732] [2021-11-23 03:43:06,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:43:06,360 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:43:06,360 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:43:06,361 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:43:06,380 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 03:43:06,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:43:06,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 401 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 03:43:06,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:43:06,773 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:43:06,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:43:06,976 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 03:43:06,977 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [110850732] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:43:06,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2057640671] [2021-11-23 03:43:06,980 INFO L159 IcfgInterpreter]: Started Sifa with 57 locations of interest [2021-11-23 03:43:06,981 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:43:06,981 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:43:06,981 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:43:06,981 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:43:23,505 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 174 for LOIs [2021-11-23 03:43:24,971 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-23 03:43:24,973 INFO L197 IcfgInterpreter]: Interpreting procedure read_side1_failed_history with input of size 21 for LOIs [2021-11-23 03:43:24,983 INFO L197 IcfgInterpreter]: Interpreting procedure assert with input of size 30 for LOIs [2021-11-23 03:43:24,997 INFO L197 IcfgInterpreter]: Interpreting procedure read_side2_failed_history with input of size 26 for LOIs [2021-11-23 03:43:25,008 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 15 for LOIs [2021-11-23 03:43:25,015 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:43:37,079 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10143#(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 [2021-11-23 03:43:37,079 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:43:37,079 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:43:37,079 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 13 [2021-11-23 03:43:37,079 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [191390053] [2021-11-23 03:43:37,080 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:43:37,080 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-23 03:43:37,080 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:43:37,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-23 03:43:37,082 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=2829, Unknown=0, NotChecked=0, Total=3080 [2021-11-23 03:43:37,083 INFO L87 Difference]: Start difference. First operand 442 states and 619 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) [2021-11-23 03:43:37,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:43:37,779 INFO L93 Difference]: Finished difference Result 1158 states and 1633 transitions. [2021-11-23 03:43:37,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 03:43:37,780 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 [2021-11-23 03:43:37,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:43:37,786 INFO L225 Difference]: With dead ends: 1158 [2021-11-23 03:43:37,786 INFO L226 Difference]: Without dead ends: 799 [2021-11-23 03:43:37,790 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 130 SyntacticMatches, 9 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1126 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=277, Invalid=3383, Unknown=0, NotChecked=0, Total=3660 [2021-11-23 03:43:37,791 INFO L933 BasicCegarLoop]: 289 mSDtfsCounter, 272 mSDsluCounter, 3011 mSDsCounter, 0 mSdLazyCounter, 600 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 291 SdHoareTripleChecker+Valid, 3133 SdHoareTripleChecker+Invalid, 634 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 600 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:43:37,791 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [291 Valid, 3133 Invalid, 634 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 600 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 03:43:37,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 799 states. [2021-11-23 03:43:37,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 799 to 497. [2021-11-23 03:43:37,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 497 states, 370 states have (on average 1.3702702702702703) internal successors, (507), 373 states have internal predecessors, (507), 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) [2021-11-23 03:43:37,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 497 states to 497 states and 675 transitions. [2021-11-23 03:43:37,864 INFO L78 Accepts]: Start accepts. Automaton has 497 states and 675 transitions. Word has length 62 [2021-11-23 03:43:37,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:43:37,864 INFO L470 AbstractCegarLoop]: Abstraction has 497 states and 675 transitions. [2021-11-23 03:43:37,864 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) [2021-11-23 03:43:37,865 INFO L276 IsEmpty]: Start isEmpty. Operand 497 states and 675 transitions. [2021-11-23 03:43:37,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 03:43:37,866 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:43:37,866 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] [2021-11-23 03:43:37,906 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 03:43:38,080 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:43:38,081 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:43:38,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:43:38,081 INFO L85 PathProgramCache]: Analyzing trace with hash -1308659894, now seen corresponding path program 1 times [2021-11-23 03:43:38,081 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:43:38,081 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1256559588] [2021-11-23 03:43:38,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:43:38,081 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:43:38,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:43:38,185 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:43:38,186 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:43:38,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1256559588] [2021-11-23 03:43:38,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1256559588] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:43:38,186 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:43:38,186 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:43:38,186 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1767228264] [2021-11-23 03:43:38,186 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:43:38,186 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:43:38,187 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:43:38,187 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:43:38,187 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:43:38,187 INFO L87 Difference]: Start difference. First operand 497 states and 675 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) [2021-11-23 03:43:38,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:43:38,291 INFO L93 Difference]: Finished difference Result 907 states and 1237 transitions. [2021-11-23 03:43:38,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:43:38,292 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 [2021-11-23 03:43:38,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:43:38,296 INFO L225 Difference]: With dead ends: 907 [2021-11-23 03:43:38,296 INFO L226 Difference]: Without dead ends: 509 [2021-11-23 03:43:38,298 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 [2021-11-23 03:43:38,299 INFO L933 BasicCegarLoop]: 216 mSDtfsCounter, 5 mSDsluCounter, 439 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 633 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 [2021-11-23 03:43:38,308 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 633 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:43:38,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 509 states. [2021-11-23 03:43:38,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 509 to 509. [2021-11-23 03:43:38,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 509 states, 379 states have (on average 1.3614775725593669) internal successors, (516), 382 states have internal predecessors, (516), 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) [2021-11-23 03:43:38,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 509 states to 509 states and 684 transitions. [2021-11-23 03:43:38,363 INFO L78 Accepts]: Start accepts. Automaton has 509 states and 684 transitions. Word has length 66 [2021-11-23 03:43:38,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:43:38,364 INFO L470 AbstractCegarLoop]: Abstraction has 509 states and 684 transitions. [2021-11-23 03:43:38,364 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) [2021-11-23 03:43:38,365 INFO L276 IsEmpty]: Start isEmpty. Operand 509 states and 684 transitions. [2021-11-23 03:43:38,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 03:43:38,368 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:43:38,368 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] [2021-11-23 03:43:38,369 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-23 03:43:38,369 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:43:38,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:43:38,369 INFO L85 PathProgramCache]: Analyzing trace with hash -17388373, now seen corresponding path program 1 times [2021-11-23 03:43:38,370 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:43:38,370 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2029547163] [2021-11-23 03:43:38,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:43:38,370 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:43:38,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:43:38,483 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:43:38,484 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:43:38,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2029547163] [2021-11-23 03:43:38,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2029547163] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:43:38,484 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:43:38,485 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 03:43:38,487 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701362278] [2021-11-23 03:43:38,487 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:43:38,488 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:43:38,488 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:43:38,489 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:43:38,489 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:43:38,489 INFO L87 Difference]: Start difference. First operand 509 states and 684 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) [2021-11-23 03:43:38,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:43:38,682 INFO L93 Difference]: Finished difference Result 642 states and 895 transitions. [2021-11-23 03:43:38,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 03:43:38,682 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 [2021-11-23 03:43:38,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:43:38,687 INFO L225 Difference]: With dead ends: 642 [2021-11-23 03:43:38,687 INFO L226 Difference]: Without dead ends: 640 [2021-11-23 03:43:38,688 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 [2021-11-23 03:43:38,689 INFO L933 BasicCegarLoop]: 384 mSDtfsCounter, 173 mSDsluCounter, 1380 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 195 SdHoareTripleChecker+Valid, 1706 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 [2021-11-23 03:43:38,689 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [195 Valid, 1706 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:43:38,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 640 states. [2021-11-23 03:43:38,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 640 to 513. [2021-11-23 03:43:38,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 513 states, 381 states have (on average 1.3595800524934383) internal successors, (518), 385 states have internal predecessors, (518), 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) [2021-11-23 03:43:38,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 513 states to 513 states and 688 transitions. [2021-11-23 03:43:38,746 INFO L78 Accepts]: Start accepts. Automaton has 513 states and 688 transitions. Word has length 65 [2021-11-23 03:43:38,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:43:38,747 INFO L470 AbstractCegarLoop]: Abstraction has 513 states and 688 transitions. [2021-11-23 03:43:38,747 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) [2021-11-23 03:43:38,747 INFO L276 IsEmpty]: Start isEmpty. Operand 513 states and 688 transitions. [2021-11-23 03:43:38,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 03:43:38,749 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:43:38,749 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] [2021-11-23 03:43:38,749 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-23 03:43:38,749 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:43:38,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:43:38,750 INFO L85 PathProgramCache]: Analyzing trace with hash 262723461, now seen corresponding path program 1 times [2021-11-23 03:43:38,750 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:43:38,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [490633453] [2021-11-23 03:43:38,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:43:38,751 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:43:38,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:43:38,815 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:43:38,816 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:43:38,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [490633453] [2021-11-23 03:43:38,816 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [490633453] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:43:38,816 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:43:38,816 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:43:38,817 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [238358898] [2021-11-23 03:43:38,817 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:43:38,817 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:43:38,817 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:43:38,818 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:43:38,818 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:43:38,818 INFO L87 Difference]: Start difference. First operand 513 states and 688 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) [2021-11-23 03:43:38,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:43:38,910 INFO L93 Difference]: Finished difference Result 833 states and 1120 transitions. [2021-11-23 03:43:38,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:43:38,911 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 [2021-11-23 03:43:38,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:43:38,915 INFO L225 Difference]: With dead ends: 833 [2021-11-23 03:43:38,915 INFO L226 Difference]: Without dead ends: 507 [2021-11-23 03:43:38,916 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 [2021-11-23 03:43:38,917 INFO L933 BasicCegarLoop]: 211 mSDtfsCounter, 7 mSDsluCounter, 436 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 625 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:43:38,918 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 625 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:43:38,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 507 states. [2021-11-23 03:43:38,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 507 to 507. [2021-11-23 03:43:38,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 507 states, 378 states have (on average 1.3386243386243386) internal successors, (506), 382 states have internal predecessors, (506), 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) [2021-11-23 03:43:38,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 507 states to 507 states and 670 transitions. [2021-11-23 03:43:38,975 INFO L78 Accepts]: Start accepts. Automaton has 507 states and 670 transitions. Word has length 68 [2021-11-23 03:43:38,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:43:38,976 INFO L470 AbstractCegarLoop]: Abstraction has 507 states and 670 transitions. [2021-11-23 03:43:38,976 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) [2021-11-23 03:43:38,976 INFO L276 IsEmpty]: Start isEmpty. Operand 507 states and 670 transitions. [2021-11-23 03:43:38,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-23 03:43:38,978 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:43:38,978 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] [2021-11-23 03:43:38,978 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-23 03:43:38,978 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:43:38,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:43:38,979 INFO L85 PathProgramCache]: Analyzing trace with hash 1200443003, now seen corresponding path program 1 times [2021-11-23 03:43:38,979 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:43:38,979 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2080020211] [2021-11-23 03:43:38,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:43:38,980 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:43:39,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:43:39,273 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 03:43:39,273 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:43:39,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2080020211] [2021-11-23 03:43:39,274 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2080020211] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:43:39,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1545172764] [2021-11-23 03:43:39,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:43:39,274 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:43:39,274 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:43:39,276 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:43:39,291 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 03:43:39,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:43:39,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 419 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 03:43:39,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:43:39,812 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 03:43:39,812 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:43:40,088 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 03:43:40,088 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1545172764] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:43:40,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [788598148] [2021-11-23 03:43:40,095 INFO L159 IcfgInterpreter]: Started Sifa with 60 locations of interest [2021-11-23 03:43:40,096 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:43:40,096 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:43:40,096 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:43:40,097 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:43:57,006 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 174 for LOIs [2021-11-23 03:43:58,417 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 16 for LOIs [2021-11-23 03:43:58,419 INFO L197 IcfgInterpreter]: Interpreting procedure read_side1_failed_history with input of size 30 for LOIs [2021-11-23 03:43:58,433 INFO L197 IcfgInterpreter]: Interpreting procedure assert with input of size 31 for LOIs [2021-11-23 03:43:58,441 INFO L197 IcfgInterpreter]: Interpreting procedure read_side2_failed_history with input of size 25 for LOIs [2021-11-23 03:43:58,452 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 15 for LOIs [2021-11-23 03:43:58,458 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:44:12,645 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17954#(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 [2021-11-23 03:44:12,645 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:44:12,645 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:44:12,645 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 9, 9] total 20 [2021-11-23 03:44:12,645 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2047531912] [2021-11-23 03:44:12,645 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:44:12,646 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 03:44:12,646 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:44:12,646 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 03:44:12,648 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=301, Invalid=3859, Unknown=0, NotChecked=0, Total=4160 [2021-11-23 03:44:12,648 INFO L87 Difference]: Start difference. First operand 507 states and 670 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) [2021-11-23 03:44:13,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:44:13,913 INFO L93 Difference]: Finished difference Result 1131 states and 1557 transitions. [2021-11-23 03:44:13,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 03:44:13,914 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 [2021-11-23 03:44:13,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:44:13,922 INFO L225 Difference]: With dead ends: 1131 [2021-11-23 03:44:13,923 INFO L226 Difference]: Without dead ends: 761 [2021-11-23 03:44:13,929 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 146 SyntacticMatches, 13 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1602 ImplicationChecksByTransitivity, 14.7s TimeCoverageRelationStatistics Valid=352, Invalid=4760, Unknown=0, NotChecked=0, Total=5112 [2021-11-23 03:44:13,933 INFO L933 BasicCegarLoop]: 363 mSDtfsCounter, 596 mSDsluCounter, 4338 mSDsCounter, 0 mSdLazyCounter, 1002 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 631 SdHoareTripleChecker+Valid, 4486 SdHoareTripleChecker+Invalid, 1131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 1002 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 03:44:13,933 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [631 Valid, 4486 Invalid, 1131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 1002 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 03:44:13,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 761 states. [2021-11-23 03:44:14,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 761 to 514. [2021-11-23 03:44:14,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 514 states, 384 states have (on average 1.3333333333333333) internal successors, (512), 389 states have internal predecessors, (512), 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) [2021-11-23 03:44:14,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 514 states to 514 states and 672 transitions. [2021-11-23 03:44:14,005 INFO L78 Accepts]: Start accepts. Automaton has 514 states and 672 transitions. Word has length 70 [2021-11-23 03:44:14,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:44:14,005 INFO L470 AbstractCegarLoop]: Abstraction has 514 states and 672 transitions. [2021-11-23 03:44:14,006 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) [2021-11-23 03:44:14,006 INFO L276 IsEmpty]: Start isEmpty. Operand 514 states and 672 transitions. [2021-11-23 03:44:14,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-23 03:44:14,008 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:44:14,009 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] [2021-11-23 03:44:14,034 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 03:44:14,224 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:44:14,224 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:44:14,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:44:14,225 INFO L85 PathProgramCache]: Analyzing trace with hash -1025192534, now seen corresponding path program 1 times [2021-11-23 03:44:14,225 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:44:14,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1634769824] [2021-11-23 03:44:14,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:44:14,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:44:14,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:44:14,339 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 03:44:14,339 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:44:14,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1634769824] [2021-11-23 03:44:14,340 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1634769824] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:44:14,340 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:44:14,340 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-23 03:44:14,340 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913995511] [2021-11-23 03:44:14,340 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:44:14,341 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 03:44:14,341 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:44:14,341 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 03:44:14,342 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-23 03:44:14,342 INFO L87 Difference]: Start difference. First operand 514 states and 672 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) [2021-11-23 03:44:15,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:44:15,104 INFO L93 Difference]: Finished difference Result 1220 states and 1673 transitions. [2021-11-23 03:44:15,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 03:44:15,105 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 [2021-11-23 03:44:15,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:44:15,111 INFO L225 Difference]: With dead ends: 1220 [2021-11-23 03:44:15,111 INFO L226 Difference]: Without dead ends: 909 [2021-11-23 03:44:15,113 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 [2021-11-23 03:44:15,113 INFO L933 BasicCegarLoop]: 433 mSDtfsCounter, 601 mSDsluCounter, 1627 mSDsCounter, 0 mSdLazyCounter, 593 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 607 SdHoareTripleChecker+Valid, 1992 SdHoareTripleChecker+Invalid, 647 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 593 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:44:15,114 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [607 Valid, 1992 Invalid, 647 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 593 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 03:44:15,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 909 states. [2021-11-23 03:44:15,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 909 to 641. [2021-11-23 03:44:15,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 641 states, 476 states have (on average 1.3277310924369747) internal successors, (632), 481 states have internal predecessors, (632), 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) [2021-11-23 03:44:15,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 641 states to 641 states and 838 transitions. [2021-11-23 03:44:15,195 INFO L78 Accepts]: Start accepts. Automaton has 641 states and 838 transitions. Word has length 71 [2021-11-23 03:44:15,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:44:15,195 INFO L470 AbstractCegarLoop]: Abstraction has 641 states and 838 transitions. [2021-11-23 03:44:15,195 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) [2021-11-23 03:44:15,196 INFO L276 IsEmpty]: Start isEmpty. Operand 641 states and 838 transitions. [2021-11-23 03:44:15,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-23 03:44:15,198 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:44:15,198 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] [2021-11-23 03:44:15,198 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-23 03:44:15,199 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:44:15,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:44:15,199 INFO L85 PathProgramCache]: Analyzing trace with hash -913951703, now seen corresponding path program 1 times [2021-11-23 03:44:15,199 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:44:15,200 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1966881811] [2021-11-23 03:44:15,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:44:15,200 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:44:15,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:44:15,261 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 03:44:15,262 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:44:15,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1966881811] [2021-11-23 03:44:15,262 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1966881811] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:44:15,262 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:44:15,263 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:44:15,263 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1348743232] [2021-11-23 03:44:15,263 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:44:15,264 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:44:15,264 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:44:15,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:44:15,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:44:15,266 INFO L87 Difference]: Start difference. First operand 641 states and 838 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) [2021-11-23 03:44:15,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:44:15,538 INFO L93 Difference]: Finished difference Result 1605 states and 2140 transitions. [2021-11-23 03:44:15,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:44:15,539 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 [2021-11-23 03:44:15,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:44:15,546 INFO L225 Difference]: With dead ends: 1605 [2021-11-23 03:44:15,547 INFO L226 Difference]: Without dead ends: 1162 [2021-11-23 03:44:15,550 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 [2021-11-23 03:44:15,550 INFO L933 BasicCegarLoop]: 306 mSDtfsCounter, 342 mSDsluCounter, 527 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 342 SdHoareTripleChecker+Valid, 813 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 [2021-11-23 03:44:15,551 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [342 Valid, 813 Invalid, 154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:44:15,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1162 states. [2021-11-23 03:44:15,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1162 to 1041. [2021-11-23 03:44:15,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1041 states, 772 states have (on average 1.3186528497409327) internal successors, (1018), 781 states have internal predecessors, (1018), 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) [2021-11-23 03:44:15,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1041 states to 1041 states and 1354 transitions. [2021-11-23 03:44:15,669 INFO L78 Accepts]: Start accepts. Automaton has 1041 states and 1354 transitions. Word has length 71 [2021-11-23 03:44:15,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:44:15,669 INFO L470 AbstractCegarLoop]: Abstraction has 1041 states and 1354 transitions. [2021-11-23 03:44:15,669 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) [2021-11-23 03:44:15,669 INFO L276 IsEmpty]: Start isEmpty. Operand 1041 states and 1354 transitions. [2021-11-23 03:44:15,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-23 03:44:15,671 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:44:15,671 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] [2021-11-23 03:44:15,671 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-23 03:44:15,671 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:44:15,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:44:15,672 INFO L85 PathProgramCache]: Analyzing trace with hash -1420846434, now seen corresponding path program 1 times [2021-11-23 03:44:15,672 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:44:15,672 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1370179697] [2021-11-23 03:44:15,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:44:15,673 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:44:15,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:44:15,796 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 03:44:15,796 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:44:15,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1370179697] [2021-11-23 03:44:15,797 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1370179697] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:44:15,797 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:44:15,797 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-23 03:44:15,797 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1665487370] [2021-11-23 03:44:15,797 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:44:15,798 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 03:44:15,798 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:44:15,798 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 03:44:15,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-23 03:44:15,799 INFO L87 Difference]: Start difference. First operand 1041 states and 1354 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) [2021-11-23 03:44:16,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:44:16,686 INFO L93 Difference]: Finished difference Result 2948 states and 3996 transitions. [2021-11-23 03:44:16,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 03:44:16,687 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 [2021-11-23 03:44:16,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:44:16,702 INFO L225 Difference]: With dead ends: 2948 [2021-11-23 03:44:16,702 INFO L226 Difference]: Without dead ends: 2161 [2021-11-23 03:44:16,706 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 [2021-11-23 03:44:16,706 INFO L933 BasicCegarLoop]: 445 mSDtfsCounter, 776 mSDsluCounter, 1487 mSDsCounter, 0 mSdLazyCounter, 514 mSolverCounterSat, 189 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 782 SdHoareTripleChecker+Valid, 1842 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 [2021-11-23 03:44:16,707 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [782 Valid, 1842 Invalid, 703 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [189 Valid, 514 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 03:44:16,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2161 states. [2021-11-23 03:44:16,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2161 to 1456. [2021-11-23 03:44:16,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1456 states, 1071 states have (on average 1.3090569561157797) internal successors, (1402), 1083 states have internal predecessors, (1402), 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) [2021-11-23 03:44:16,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1456 states to 1456 states and 1890 transitions. [2021-11-23 03:44:16,916 INFO L78 Accepts]: Start accepts. Automaton has 1456 states and 1890 transitions. Word has length 73 [2021-11-23 03:44:16,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:44:16,917 INFO L470 AbstractCegarLoop]: Abstraction has 1456 states and 1890 transitions. [2021-11-23 03:44:16,917 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) [2021-11-23 03:44:16,917 INFO L276 IsEmpty]: Start isEmpty. Operand 1456 states and 1890 transitions. [2021-11-23 03:44:16,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-23 03:44:16,919 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:44:16,919 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] [2021-11-23 03:44:16,919 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-23 03:44:16,920 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:44:16,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:44:16,920 INFO L85 PathProgramCache]: Analyzing trace with hash -741502709, now seen corresponding path program 1 times [2021-11-23 03:44:16,920 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:44:16,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [618170482] [2021-11-23 03:44:16,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:44:16,921 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:44:16,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:44:16,972 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 03:44:16,972 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:44:16,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [618170482] [2021-11-23 03:44:16,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [618170482] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:44:16,973 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:44:16,973 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:44:16,974 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759599796] [2021-11-23 03:44:16,975 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:44:16,975 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:44:16,976 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:44:16,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:44:16,976 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:44:16,976 INFO L87 Difference]: Start difference. First operand 1456 states and 1890 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) [2021-11-23 03:44:17,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:44:17,359 INFO L93 Difference]: Finished difference Result 3516 states and 4628 transitions. [2021-11-23 03:44:17,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:44:17,360 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 [2021-11-23 03:44:17,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:44:17,377 INFO L225 Difference]: With dead ends: 3516 [2021-11-23 03:44:17,377 INFO L226 Difference]: Without dead ends: 2450 [2021-11-23 03:44:17,381 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 [2021-11-23 03:44:17,381 INFO L933 BasicCegarLoop]: 332 mSDtfsCounter, 367 mSDsluCounter, 568 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 367 SdHoareTripleChecker+Valid, 877 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 [2021-11-23 03:44:17,382 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [367 Valid, 877 Invalid, 146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:44:17,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2450 states. [2021-11-23 03:44:17,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2450 to 2160. [2021-11-23 03:44:17,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2160 states, 1585 states have (on average 1.3003154574132492) internal successors, (2061), 1602 states have internal predecessors, (2061), 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) [2021-11-23 03:44:17,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2160 states to 2160 states and 2795 transitions. [2021-11-23 03:44:17,652 INFO L78 Accepts]: Start accepts. Automaton has 2160 states and 2795 transitions. Word has length 75 [2021-11-23 03:44:17,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:44:17,652 INFO L470 AbstractCegarLoop]: Abstraction has 2160 states and 2795 transitions. [2021-11-23 03:44:17,653 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) [2021-11-23 03:44:17,653 INFO L276 IsEmpty]: Start isEmpty. Operand 2160 states and 2795 transitions. [2021-11-23 03:44:17,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-23 03:44:17,658 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:44:17,658 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] [2021-11-23 03:44:17,658 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-23 03:44:17,659 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:44:17,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:44:17,659 INFO L85 PathProgramCache]: Analyzing trace with hash -795481455, now seen corresponding path program 1 times [2021-11-23 03:44:17,659 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:44:17,659 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1040108515] [2021-11-23 03:44:17,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:44:17,660 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:44:17,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:44:17,718 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 03:44:17,718 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:44:17,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1040108515] [2021-11-23 03:44:17,718 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1040108515] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:44:17,718 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:44:17,719 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:44:17,719 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [5302380] [2021-11-23 03:44:17,719 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:44:17,719 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:44:17,720 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:44:17,720 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:44:17,720 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:44:17,720 INFO L87 Difference]: Start difference. First operand 2160 states and 2795 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) [2021-11-23 03:44:18,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:44:18,145 INFO L93 Difference]: Finished difference Result 4758 states and 6223 transitions. [2021-11-23 03:44:18,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:44:18,146 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 [2021-11-23 03:44:18,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:44:18,165 INFO L225 Difference]: With dead ends: 4758 [2021-11-23 03:44:18,166 INFO L226 Difference]: Without dead ends: 3159 [2021-11-23 03:44:18,171 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 [2021-11-23 03:44:18,171 INFO L933 BasicCegarLoop]: 396 mSDtfsCounter, 343 mSDsluCounter, 570 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 343 SdHoareTripleChecker+Valid, 946 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 [2021-11-23 03:44:18,172 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [343 Valid, 946 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:44:18,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3159 states. [2021-11-23 03:44:18,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3159 to 2900. [2021-11-23 03:44:18,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2900 states, 2126 states have (on average 1.295390404515522) internal successors, (2754), 2149 states have internal predecessors, (2754), 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) [2021-11-23 03:44:18,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2900 states to 2900 states and 3746 transitions. [2021-11-23 03:44:18,462 INFO L78 Accepts]: Start accepts. Automaton has 2900 states and 3746 transitions. Word has length 75 [2021-11-23 03:44:18,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:44:18,462 INFO L470 AbstractCegarLoop]: Abstraction has 2900 states and 3746 transitions. [2021-11-23 03:44:18,463 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) [2021-11-23 03:44:18,463 INFO L276 IsEmpty]: Start isEmpty. Operand 2900 states and 3746 transitions. [2021-11-23 03:44:18,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-23 03:44:18,466 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:44:18,466 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] [2021-11-23 03:44:18,466 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-23 03:44:18,466 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:44:18,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:44:18,467 INFO L85 PathProgramCache]: Analyzing trace with hash 1909996017, now seen corresponding path program 1 times [2021-11-23 03:44:18,467 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:44:18,467 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [168003890] [2021-11-23 03:44:18,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:44:18,468 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:44:18,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:44:18,529 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 03:44:18,530 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:44:18,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [168003890] [2021-11-23 03:44:18,530 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [168003890] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:44:18,530 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:44:18,530 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:44:18,530 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1316559393] [2021-11-23 03:44:18,531 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:44:18,531 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:44:18,531 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:44:18,532 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:44:18,532 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:44:18,532 INFO L87 Difference]: Start difference. First operand 2900 states and 3746 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) [2021-11-23 03:44:18,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:44:18,861 INFO L93 Difference]: Finished difference Result 5083 states and 6611 transitions. [2021-11-23 03:44:18,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:44:18,861 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 [2021-11-23 03:44:18,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:44:18,879 INFO L225 Difference]: With dead ends: 5083 [2021-11-23 03:44:18,879 INFO L226 Difference]: Without dead ends: 2860 [2021-11-23 03:44:18,884 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 [2021-11-23 03:44:18,885 INFO L933 BasicCegarLoop]: 207 mSDtfsCounter, 7 mSDsluCounter, 422 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 607 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:44:18,886 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 607 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:44:18,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2860 states. [2021-11-23 03:44:19,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2860 to 2860. [2021-11-23 03:44:19,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2860 states, 2106 states have (on average 1.2697056030389364) internal successors, (2674), 2129 states have internal predecessors, (2674), 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) [2021-11-23 03:44:19,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2860 states to 2860 states and 3626 transitions. [2021-11-23 03:44:19,192 INFO L78 Accepts]: Start accepts. Automaton has 2860 states and 3626 transitions. Word has length 77 [2021-11-23 03:44:19,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:44:19,193 INFO L470 AbstractCegarLoop]: Abstraction has 2860 states and 3626 transitions. [2021-11-23 03:44:19,193 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) [2021-11-23 03:44:19,193 INFO L276 IsEmpty]: Start isEmpty. Operand 2860 states and 3626 transitions. [2021-11-23 03:44:19,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-23 03:44:19,196 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:44:19,197 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] [2021-11-23 03:44:19,197 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-11-23 03:44:19,197 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:44:19,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:44:19,198 INFO L85 PathProgramCache]: Analyzing trace with hash 1881309797, now seen corresponding path program 1 times [2021-11-23 03:44:19,198 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:44:19,198 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1444399229] [2021-11-23 03:44:19,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:44:19,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:44:19,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:44:19,226 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 03:44:19,227 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:44:19,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1444399229] [2021-11-23 03:44:19,227 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1444399229] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:44:19,227 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:44:19,227 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:44:19,227 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2020253997] [2021-11-23 03:44:19,228 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:44:19,228 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:44:19,228 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:44:19,229 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:44:19,229 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:44:19,229 INFO L87 Difference]: Start difference. First operand 2860 states and 3626 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) [2021-11-23 03:44:19,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:44:19,686 INFO L93 Difference]: Finished difference Result 6155 states and 8129 transitions. [2021-11-23 03:44:19,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:44:19,686 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 [2021-11-23 03:44:19,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:44:19,709 INFO L225 Difference]: With dead ends: 6155 [2021-11-23 03:44:19,709 INFO L226 Difference]: Without dead ends: 3792 [2021-11-23 03:44:19,715 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:44:19,716 INFO L933 BasicCegarLoop]: 348 mSDtfsCounter, 112 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 532 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 [2021-11-23 03:44:19,716 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 532 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:44:19,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3792 states. [2021-11-23 03:44:20,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3792 to 2865. [2021-11-23 03:44:20,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2865 states, 2111 states have (on average 1.2690667929891046) internal successors, (2679), 2134 states have internal predecessors, (2679), 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) [2021-11-23 03:44:20,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2865 states to 2865 states and 3631 transitions. [2021-11-23 03:44:20,065 INFO L78 Accepts]: Start accepts. Automaton has 2865 states and 3631 transitions. Word has length 76 [2021-11-23 03:44:20,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:44:20,065 INFO L470 AbstractCegarLoop]: Abstraction has 2865 states and 3631 transitions. [2021-11-23 03:44:20,065 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) [2021-11-23 03:44:20,066 INFO L276 IsEmpty]: Start isEmpty. Operand 2865 states and 3631 transitions. [2021-11-23 03:44:20,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-23 03:44:20,069 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:44:20,069 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] [2021-11-23 03:44:20,069 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-11-23 03:44:20,069 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:44:20,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:44:20,070 INFO L85 PathProgramCache]: Analyzing trace with hash -2142032884, now seen corresponding path program 1 times [2021-11-23 03:44:20,070 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:44:20,070 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1448637163] [2021-11-23 03:44:20,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:44:20,071 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:44:20,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:44:20,122 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 03:44:20,122 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:44:20,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1448637163] [2021-11-23 03:44:20,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1448637163] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:44:20,123 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:44:20,123 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:44:20,123 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779232907] [2021-11-23 03:44:20,123 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:44:20,124 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:44:20,124 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:44:20,124 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:44:20,124 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:44:20,125 INFO L87 Difference]: Start difference. First operand 2865 states and 3631 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) [2021-11-23 03:44:20,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:44:20,462 INFO L93 Difference]: Finished difference Result 5334 states and 6862 transitions. [2021-11-23 03:44:20,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:44:20,462 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 [2021-11-23 03:44:20,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:44:20,480 INFO L225 Difference]: With dead ends: 5334 [2021-11-23 03:44:20,480 INFO L226 Difference]: Without dead ends: 2598 [2021-11-23 03:44:20,487 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 [2021-11-23 03:44:20,487 INFO L933 BasicCegarLoop]: 237 mSDtfsCounter, 213 mSDsluCounter, 426 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 238 SdHoareTripleChecker+Valid, 647 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 [2021-11-23 03:44:20,488 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [238 Valid, 647 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:44:20,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2598 states. [2021-11-23 03:44:20,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2598 to 2340. [2021-11-23 03:44:20,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2340 states, 1723 states have (on average 1.273360417875798) internal successors, (2194), 1742 states have internal predecessors, (2194), 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) [2021-11-23 03:44:20,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2340 states to 2340 states and 2972 transitions. [2021-11-23 03:44:20,797 INFO L78 Accepts]: Start accepts. Automaton has 2340 states and 2972 transitions. Word has length 77 [2021-11-23 03:44:20,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:44:20,797 INFO L470 AbstractCegarLoop]: Abstraction has 2340 states and 2972 transitions. [2021-11-23 03:44:20,798 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) [2021-11-23 03:44:20,798 INFO L276 IsEmpty]: Start isEmpty. Operand 2340 states and 2972 transitions. [2021-11-23 03:44:20,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-23 03:44:20,799 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:44:20,800 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] [2021-11-23 03:44:20,800 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-11-23 03:44:20,800 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:44:20,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:44:20,801 INFO L85 PathProgramCache]: Analyzing trace with hash -1532157264, now seen corresponding path program 1 times [2021-11-23 03:44:20,801 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:44:20,801 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1912905720] [2021-11-23 03:44:20,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:44:20,801 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:44:20,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:44:20,831 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 03:44:20,831 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:44:20,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1912905720] [2021-11-23 03:44:20,832 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1912905720] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:44:20,832 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:44:20,832 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:44:20,832 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769507260] [2021-11-23 03:44:20,832 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:44:20,833 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:44:20,833 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:44:20,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:44:20,834 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:44:20,834 INFO L87 Difference]: Start difference. First operand 2340 states and 2972 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) [2021-11-23 03:44:21,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:44:21,258 INFO L93 Difference]: Finished difference Result 4922 states and 6461 transitions. [2021-11-23 03:44:21,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:44:21,259 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 [2021-11-23 03:44:21,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:44:21,279 INFO L225 Difference]: With dead ends: 4922 [2021-11-23 03:44:21,279 INFO L226 Difference]: Without dead ends: 2894 [2021-11-23 03:44:21,284 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:44:21,285 INFO L933 BasicCegarLoop]: 327 mSDtfsCounter, 112 mSDsluCounter, 184 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 509 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 [2021-11-23 03:44:21,286 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 509 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:44:21,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2894 states. [2021-11-23 03:44:21,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2894 to 2345. [2021-11-23 03:44:21,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2345 states, 1728 states have (on average 1.2725694444444444) internal successors, (2199), 1747 states have internal predecessors, (2199), 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) [2021-11-23 03:44:21,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2345 states to 2345 states and 2977 transitions. [2021-11-23 03:44:21,649 INFO L78 Accepts]: Start accepts. Automaton has 2345 states and 2977 transitions. Word has length 78 [2021-11-23 03:44:21,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:44:21,649 INFO L470 AbstractCegarLoop]: Abstraction has 2345 states and 2977 transitions. [2021-11-23 03:44:21,649 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) [2021-11-23 03:44:21,649 INFO L276 IsEmpty]: Start isEmpty. Operand 2345 states and 2977 transitions. [2021-11-23 03:44:21,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-23 03:44:21,652 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:44:21,652 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] [2021-11-23 03:44:21,652 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-11-23 03:44:21,652 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:44:21,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:44:21,653 INFO L85 PathProgramCache]: Analyzing trace with hash -876335019, now seen corresponding path program 1 times [2021-11-23 03:44:21,653 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:44:21,653 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1014934689] [2021-11-23 03:44:21,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:44:21,654 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:44:21,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:44:21,711 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 03:44:21,712 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:44:21,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1014934689] [2021-11-23 03:44:21,712 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1014934689] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:44:21,712 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:44:21,713 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:44:21,713 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904107174] [2021-11-23 03:44:21,713 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:44:21,713 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:44:21,714 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:44:21,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:44:21,714 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:44:21,714 INFO L87 Difference]: Start difference. First operand 2345 states and 2977 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) [2021-11-23 03:44:22,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:44:22,065 INFO L93 Difference]: Finished difference Result 4679 states and 6084 transitions. [2021-11-23 03:44:22,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:44:22,065 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 [2021-11-23 03:44:22,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:44:22,081 INFO L225 Difference]: With dead ends: 4679 [2021-11-23 03:44:22,082 INFO L226 Difference]: Without dead ends: 2594 [2021-11-23 03:44:22,087 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 [2021-11-23 03:44:22,088 INFO L933 BasicCegarLoop]: 234 mSDtfsCounter, 170 mSDsluCounter, 429 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 195 SdHoareTripleChecker+Valid, 645 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 [2021-11-23 03:44:22,088 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [195 Valid, 645 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:44:22,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2594 states. [2021-11-23 03:44:22,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2594 to 2157. [2021-11-23 03:44:22,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2157 states, 1584 states have (on average 1.2683080808080809) internal successors, (2009), 1599 states have internal predecessors, (2009), 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) [2021-11-23 03:44:22,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2157 states to 2157 states and 2731 transitions. [2021-11-23 03:44:22,345 INFO L78 Accepts]: Start accepts. Automaton has 2157 states and 2731 transitions. Word has length 78 [2021-11-23 03:44:22,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:44:22,345 INFO L470 AbstractCegarLoop]: Abstraction has 2157 states and 2731 transitions. [2021-11-23 03:44:22,346 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) [2021-11-23 03:44:22,347 INFO L276 IsEmpty]: Start isEmpty. Operand 2157 states and 2731 transitions. [2021-11-23 03:44:22,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-23 03:44:22,349 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:44:22,349 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] [2021-11-23 03:44:22,350 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-11-23 03:44:22,350 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:44:22,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:44:22,350 INFO L85 PathProgramCache]: Analyzing trace with hash -1405948241, now seen corresponding path program 1 times [2021-11-23 03:44:22,350 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:44:22,351 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [653856158] [2021-11-23 03:44:22,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:44:22,351 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:44:22,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:44:22,412 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-11-23 03:44:22,413 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:44:22,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [653856158] [2021-11-23 03:44:22,413 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [653856158] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:44:22,413 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:44:22,413 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:44:22,414 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [252508087] [2021-11-23 03:44:22,414 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:44:22,414 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:44:22,414 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:44:22,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:44:22,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:44:22,415 INFO L87 Difference]: Start difference. First operand 2157 states and 2731 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) [2021-11-23 03:44:22,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:44:22,717 INFO L93 Difference]: Finished difference Result 4000 states and 5098 transitions. [2021-11-23 03:44:22,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:44:22,718 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 [2021-11-23 03:44:22,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:44:22,734 INFO L225 Difference]: With dead ends: 4000 [2021-11-23 03:44:22,734 INFO L226 Difference]: Without dead ends: 2127 [2021-11-23 03:44:22,739 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 [2021-11-23 03:44:22,740 INFO L933 BasicCegarLoop]: 203 mSDtfsCounter, 7 mSDsluCounter, 414 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 595 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:44:22,740 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 595 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:44:22,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2127 states. [2021-11-23 03:44:22,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2127 to 2052. [2021-11-23 03:44:22,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2052 states, 1515 states have (on average 1.2389438943894389) internal successors, (1877), 1530 states have internal predecessors, (1877), 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) [2021-11-23 03:44:22,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2052 states to 2052 states and 2545 transitions. [2021-11-23 03:44:22,957 INFO L78 Accepts]: Start accepts. Automaton has 2052 states and 2545 transitions. Word has length 93 [2021-11-23 03:44:22,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:44:22,958 INFO L470 AbstractCegarLoop]: Abstraction has 2052 states and 2545 transitions. [2021-11-23 03:44:22,958 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) [2021-11-23 03:44:22,958 INFO L276 IsEmpty]: Start isEmpty. Operand 2052 states and 2545 transitions. [2021-11-23 03:44:22,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-23 03:44:22,962 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:44:22,962 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] [2021-11-23 03:44:22,962 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-11-23 03:44:22,962 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:44:22,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:44:22,963 INFO L85 PathProgramCache]: Analyzing trace with hash 603476333, now seen corresponding path program 1 times [2021-11-23 03:44:22,963 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:44:22,963 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [719489607] [2021-11-23 03:44:22,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:44:22,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:44:22,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:44:23,028 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-23 03:44:23,029 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:44:23,029 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [719489607] [2021-11-23 03:44:23,029 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [719489607] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:44:23,029 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:44:23,029 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:44:23,030 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [232541564] [2021-11-23 03:44:23,030 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:44:23,030 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:44:23,030 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:44:23,031 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:44:23,031 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:44:23,031 INFO L87 Difference]: Start difference. First operand 2052 states and 2545 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) [2021-11-23 03:44:23,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:44:23,264 INFO L93 Difference]: Finished difference Result 3757 states and 4693 transitions. [2021-11-23 03:44:23,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:44:23,264 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 [2021-11-23 03:44:23,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:44:23,272 INFO L225 Difference]: With dead ends: 3757 [2021-11-23 03:44:23,273 INFO L226 Difference]: Without dead ends: 2016 [2021-11-23 03:44:23,277 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 [2021-11-23 03:44:23,278 INFO L933 BasicCegarLoop]: 200 mSDtfsCounter, 6 mSDsluCounter, 408 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 586 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 [2021-11-23 03:44:23,278 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 586 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:44:23,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2016 states. [2021-11-23 03:44:23,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2016 to 1922. [2021-11-23 03:44:23,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1922 states, 1419 states have (on average 1.2135306553911205) internal successors, (1722), 1434 states have internal predecessors, (1722), 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) [2021-11-23 03:44:23,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1922 states to 1922 states and 2344 transitions. [2021-11-23 03:44:23,490 INFO L78 Accepts]: Start accepts. Automaton has 1922 states and 2344 transitions. Word has length 109 [2021-11-23 03:44:23,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:44:23,491 INFO L470 AbstractCegarLoop]: Abstraction has 1922 states and 2344 transitions. [2021-11-23 03:44:23,491 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) [2021-11-23 03:44:23,491 INFO L276 IsEmpty]: Start isEmpty. Operand 1922 states and 2344 transitions. [2021-11-23 03:44:23,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-11-23 03:44:23,496 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:44:23,497 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] [2021-11-23 03:44:23,497 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-11-23 03:44:23,497 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:44:23,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:44:23,498 INFO L85 PathProgramCache]: Analyzing trace with hash 507710890, now seen corresponding path program 1 times [2021-11-23 03:44:23,498 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:44:23,498 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1542524337] [2021-11-23 03:44:23,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:44:23,498 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:44:23,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:44:23,642 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2021-11-23 03:44:23,642 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:44:23,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1542524337] [2021-11-23 03:44:23,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1542524337] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:44:23,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1110116782] [2021-11-23 03:44:23,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:44:23,643 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:44:23,643 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:44:23,648 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:44:23,664 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 03:44:23,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:44:23,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 530 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 03:44:23,780 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:44:24,026 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 42 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 03:44:24,026 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:44:24,026 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1110116782] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:44:24,026 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:44:24,027 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [8] total 11 [2021-11-23 03:44:24,027 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [901178584] [2021-11-23 03:44:24,027 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:44:24,028 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 03:44:24,028 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:44:24,028 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 03:44:24,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-23 03:44:24,029 INFO L87 Difference]: Start difference. First operand 1922 states and 2344 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) [2021-11-23 03:44:24,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:44:24,832 INFO L93 Difference]: Finished difference Result 5035 states and 6205 transitions. [2021-11-23 03:44:24,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 03:44:24,837 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 [2021-11-23 03:44:24,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:44:24,851 INFO L225 Difference]: With dead ends: 5035 [2021-11-23 03:44:24,851 INFO L226 Difference]: Without dead ends: 3280 [2021-11-23 03:44:24,856 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 [2021-11-23 03:44:24,857 INFO L933 BasicCegarLoop]: 232 mSDtfsCounter, 266 mSDsluCounter, 1297 mSDsCounter, 0 mSdLazyCounter, 411 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 282 SdHoareTripleChecker+Valid, 1443 SdHoareTripleChecker+Invalid, 479 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 411 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:44:24,857 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [282 Valid, 1443 Invalid, 479 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 411 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 03:44:24,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3280 states. [2021-11-23 03:44:25,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3280 to 2149. [2021-11-23 03:44:25,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2149 states, 1585 states have (on average 1.2037854889589905) internal successors, (1908), 1604 states have internal predecessors, (1908), 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) [2021-11-23 03:44:25,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2149 states to 2149 states and 2594 transitions. [2021-11-23 03:44:25,114 INFO L78 Accepts]: Start accepts. Automaton has 2149 states and 2594 transitions. Word has length 119 [2021-11-23 03:44:25,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:44:25,114 INFO L470 AbstractCegarLoop]: Abstraction has 2149 states and 2594 transitions. [2021-11-23 03:44:25,114 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) [2021-11-23 03:44:25,114 INFO L276 IsEmpty]: Start isEmpty. Operand 2149 states and 2594 transitions. [2021-11-23 03:44:25,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-23 03:44:25,119 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:44:25,119 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] [2021-11-23 03:44:25,168 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-23 03:44:25,332 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-23 03:44:25,332 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:44:25,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:44:25,333 INFO L85 PathProgramCache]: Analyzing trace with hash -299411654, now seen corresponding path program 1 times [2021-11-23 03:44:25,333 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:44:25,333 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249751062] [2021-11-23 03:44:25,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:44:25,333 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:44:25,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:44:25,850 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-11-23 03:44:25,851 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:44:25,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249751062] [2021-11-23 03:44:25,851 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [249751062] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:44:25,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1933056323] [2021-11-23 03:44:25,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:44:25,851 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:44:25,851 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:44:25,852 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:44:25,869 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 03:44:25,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:44:25,982 INFO L263 TraceCheckSpWp]: Trace formula consists of 549 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 03:44:25,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:44:26,350 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 18 proven. 1 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-23 03:44:26,350 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:44:26,637 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-23 03:44:26,637 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1933056323] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:44:26,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [757549118] [2021-11-23 03:44:26,641 INFO L159 IcfgInterpreter]: Started Sifa with 83 locations of interest [2021-11-23 03:44:26,641 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:44:26,642 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:44:26,642 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:44:26,643 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:44:42,847 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 162 for LOIs [2021-11-23 03:44:45,689 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-23 03:44:45,690 INFO L197 IcfgInterpreter]: Interpreting procedure read_side1_failed_history with input of size 22 for LOIs [2021-11-23 03:44:45,725 INFO L197 IcfgInterpreter]: Interpreting procedure assert with input of size 31 for LOIs [2021-11-23 03:44:45,738 INFO L197 IcfgInterpreter]: Interpreting procedure read_side2_failed_history with input of size 22 for LOIs [2021-11-23 03:44:45,755 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 35 for LOIs [2021-11-23 03:44:45,789 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:45:06,455 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '125967#(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 [2021-11-23 03:45:06,455 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:45:06,455 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:45:06,455 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 9, 9] total 27 [2021-11-23 03:45:06,455 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047270239] [2021-11-23 03:45:06,455 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:45:06,456 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-23 03:45:06,456 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:45:06,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-23 03:45:06,460 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=7522, Unknown=0, NotChecked=0, Total=8190 [2021-11-23 03:45:06,460 INFO L87 Difference]: Start difference. First operand 2149 states and 2594 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) [2021-11-23 03:45:08,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:45:08,956 INFO L93 Difference]: Finished difference Result 6044 states and 8050 transitions. [2021-11-23 03:45:08,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 03:45:08,956 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 [2021-11-23 03:45:08,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:45:08,973 INFO L225 Difference]: With dead ends: 6044 [2021-11-23 03:45:08,973 INFO L226 Difference]: Without dead ends: 4051 [2021-11-23 03:45:08,982 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 407 GetRequests, 295 SyntacticMatches, 13 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3333 ImplicationChecksByTransitivity, 21.3s TimeCoverageRelationStatistics Valid=734, Invalid=9366, Unknown=0, NotChecked=0, Total=10100 [2021-11-23 03:45:08,982 INFO L933 BasicCegarLoop]: 680 mSDtfsCounter, 729 mSDsluCounter, 9912 mSDsCounter, 0 mSdLazyCounter, 1966 mSolverCounterSat, 321 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 779 SdHoareTripleChecker+Valid, 10054 SdHoareTripleChecker+Invalid, 2287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 321 IncrementalHoareTripleChecker+Valid, 1966 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:45:08,983 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [779 Valid, 10054 Invalid, 2287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [321 Valid, 1966 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2021-11-23 03:45:08,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4051 states. [2021-11-23 03:45:09,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4051 to 2149. [2021-11-23 03:45:09,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2149 states, 1585 states have (on average 1.2025236593059936) internal successors, (1906), 1604 states have internal predecessors, (1906), 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) [2021-11-23 03:45:09,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2149 states to 2149 states and 2592 transitions. [2021-11-23 03:45:09,323 INFO L78 Accepts]: Start accepts. Automaton has 2149 states and 2592 transitions. Word has length 127 [2021-11-23 03:45:09,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:45:09,324 INFO L470 AbstractCegarLoop]: Abstraction has 2149 states and 2592 transitions. [2021-11-23 03:45:09,324 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) [2021-11-23 03:45:09,324 INFO L276 IsEmpty]: Start isEmpty. Operand 2149 states and 2592 transitions. [2021-11-23 03:45:09,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 03:45:09,328 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:45:09,329 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] [2021-11-23 03:45:09,364 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 03:45:09,544 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-23 03:45:09,544 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:45:09,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:45:09,545 INFO L85 PathProgramCache]: Analyzing trace with hash -37389077, now seen corresponding path program 1 times [2021-11-23 03:45:09,545 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:45:09,545 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1874070498] [2021-11-23 03:45:09,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:45:09,545 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:45:09,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:45:09,746 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2021-11-23 03:45:09,746 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:45:09,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1874070498] [2021-11-23 03:45:09,746 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1874070498] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:45:09,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1457414797] [2021-11-23 03:45:09,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:45:09,747 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:45:09,747 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:45:09,748 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:45:09,771 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 03:45:09,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:45:09,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 567 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 03:45:09,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:45:10,180 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 52 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 03:45:10,181 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:45:10,181 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1457414797] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:45:10,181 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:45:10,181 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [8] total 11 [2021-11-23 03:45:10,181 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1128290452] [2021-11-23 03:45:10,181 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:45:10,182 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 03:45:10,182 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:45:10,182 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 03:45:10,183 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-23 03:45:10,183 INFO L87 Difference]: Start difference. First operand 2149 states and 2592 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) [2021-11-23 03:45:11,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:45:11,124 INFO L93 Difference]: Finished difference Result 6146 states and 7770 transitions. [2021-11-23 03:45:11,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 03:45:11,125 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 [2021-11-23 03:45:11,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:45:11,139 INFO L225 Difference]: With dead ends: 6146 [2021-11-23 03:45:11,140 INFO L226 Difference]: Without dead ends: 4147 [2021-11-23 03:45:11,145 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 [2021-11-23 03:45:11,145 INFO L933 BasicCegarLoop]: 414 mSDtfsCounter, 292 mSDsluCounter, 2102 mSDsCounter, 0 mSdLazyCounter, 505 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 328 SdHoareTripleChecker+Valid, 2429 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 [2021-11-23 03:45:11,146 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [328 Valid, 2429 Invalid, 592 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 505 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:45:11,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4147 states. [2021-11-23 03:45:11,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4147 to 2909. [2021-11-23 03:45:11,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2909 states, 2137 states have (on average 1.1927936359382312) internal successors, (2549), 2164 states have internal predecessors, (2549), 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) [2021-11-23 03:45:11,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2909 states to 2909 states and 3491 transitions. [2021-11-23 03:45:11,510 INFO L78 Accepts]: Start accepts. Automaton has 2909 states and 3491 transitions. Word has length 135 [2021-11-23 03:45:11,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:45:11,511 INFO L470 AbstractCegarLoop]: Abstraction has 2909 states and 3491 transitions. [2021-11-23 03:45:11,511 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) [2021-11-23 03:45:11,511 INFO L276 IsEmpty]: Start isEmpty. Operand 2909 states and 3491 transitions. [2021-11-23 03:45:11,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-11-23 03:45:11,515 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:45:11,516 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] [2021-11-23 03:45:11,551 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 03:45:11,744 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:45:11,744 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:45:11,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:45:11,745 INFO L85 PathProgramCache]: Analyzing trace with hash 2029730723, now seen corresponding path program 1 times [2021-11-23 03:45:11,745 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:45:11,745 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2122267794] [2021-11-23 03:45:11,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:45:11,745 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:45:11,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:45:13,378 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 14 proven. 21 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2021-11-23 03:45:13,379 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:45:13,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2122267794] [2021-11-23 03:45:13,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2122267794] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:45:13,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1270506411] [2021-11-23 03:45:13,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:45:13,379 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:45:13,379 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:45:13,380 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:45:13,381 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 03:45:13,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:45:13,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 584 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 03:45:13,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:45:14,294 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 71 proven. 5 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-11-23 03:45:14,295 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:45:15,020 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2021-11-23 03:45:15,020 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1270506411] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:45:15,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1813000562] [2021-11-23 03:45:15,023 INFO L159 IcfgInterpreter]: Started Sifa with 89 locations of interest [2021-11-23 03:45:15,023 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:45:15,024 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:45:15,025 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:45:15,025 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:45:22,295 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 74 for LOIs [2021-11-23 03:45:22,395 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 108 for LOIs [2021-11-23 03:45:22,408 INFO L197 IcfgInterpreter]: Interpreting procedure read_side1_failed_history with input of size 104 for LOIs [2021-11-23 03:45:22,550 INFO L197 IcfgInterpreter]: Interpreting procedure assert with input of size 109 for LOIs [2021-11-23 03:45:22,589 INFO L197 IcfgInterpreter]: Interpreting procedure read_side2_failed_history with input of size 112 for LOIs [2021-11-23 03:45:22,699 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 120 for LOIs [2021-11-23 03:45:23,096 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:46:13,823 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '149923#(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 [2021-11-23 03:46:13,823 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:46:13,823 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:46:13,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 14, 14] total 55 [2021-11-23 03:46:13,824 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [332992160] [2021-11-23 03:46:13,824 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:46:13,825 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-23 03:46:13,825 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:46:13,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-23 03:46:13,829 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2047, Invalid=10385, Unknown=0, NotChecked=0, Total=12432 [2021-11-23 03:46:13,830 INFO L87 Difference]: Start difference. First operand 2909 states and 3491 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) [2021-11-23 03:46:21,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:46:21,037 INFO L93 Difference]: Finished difference Result 8198 states and 10819 transitions. [2021-11-23 03:46:21,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-23 03:46:21,038 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 [2021-11-23 03:46:21,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:46:21,060 INFO L225 Difference]: With dead ends: 8198 [2021-11-23 03:46:21,061 INFO L226 Difference]: Without dead ends: 5474 [2021-11-23 03:46:21,072 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 337 SyntacticMatches, 15 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6178 ImplicationChecksByTransitivity, 53.7s TimeCoverageRelationStatistics Valid=2523, Invalid=16659, Unknown=0, NotChecked=0, Total=19182 [2021-11-23 03:46:21,073 INFO L933 BasicCegarLoop]: 442 mSDtfsCounter, 1567 mSDsluCounter, 13924 mSDsCounter, 0 mSdLazyCounter, 6402 mSolverCounterSat, 390 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1623 SdHoareTripleChecker+Valid, 13555 SdHoareTripleChecker+Invalid, 6792 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 390 IncrementalHoareTripleChecker+Valid, 6402 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:46:21,074 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1623 Valid, 13555 Invalid, 6792 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [390 Valid, 6402 Invalid, 0 Unknown, 0 Unchecked, 5.0s Time] [2021-11-23 03:46:21,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5474 states. [2021-11-23 03:46:21,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5474 to 2880. [2021-11-23 03:46:21,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2880 states, 2116 states have (on average 1.193289224952741) internal successors, (2525), 2142 states have internal predecessors, (2525), 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) [2021-11-23 03:46:21,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2880 states to 2880 states and 3457 transitions. [2021-11-23 03:46:21,554 INFO L78 Accepts]: Start accepts. Automaton has 2880 states and 3457 transitions. Word has length 142 [2021-11-23 03:46:21,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:46:21,555 INFO L470 AbstractCegarLoop]: Abstraction has 2880 states and 3457 transitions. [2021-11-23 03:46:21,555 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) [2021-11-23 03:46:21,555 INFO L276 IsEmpty]: Start isEmpty. Operand 2880 states and 3457 transitions. [2021-11-23 03:46:21,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-23 03:46:21,560 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:46:21,560 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, 1] [2021-11-23 03:46:21,600 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 03:46:21,776 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:46:21,776 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:46:21,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:46:21,777 INFO L85 PathProgramCache]: Analyzing trace with hash -1016743126, now seen corresponding path program 1 times [2021-11-23 03:46:21,777 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:46:21,777 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1981821227] [2021-11-23 03:46:21,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:46:21,777 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:46:21,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:46:21,892 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 12 proven. 10 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-23 03:46:21,893 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:46:21,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1981821227] [2021-11-23 03:46:21,893 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1981821227] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:46:21,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1486471764] [2021-11-23 03:46:21,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:46:21,893 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:46:21,894 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:46:21,895 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:46:21,915 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 03:46:22,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:46:22,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 720 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 03:46:22,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:46:22,595 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 57 proven. 20 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-23 03:46:22,596 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:46:22,822 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 12 proven. 10 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-23 03:46:22,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1486471764] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:46:22,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1785893055] [2021-11-23 03:46:22,826 INFO L159 IcfgInterpreter]: Started Sifa with 78 locations of interest [2021-11-23 03:46:22,826 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:46:22,827 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:46:22,827 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:46:22,827 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:47:21,661 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 74 for LOIs [2021-11-23 03:47:21,804 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 107 for LOIs [2021-11-23 03:47:21,821 INFO L197 IcfgInterpreter]: Interpreting procedure read_side1_failed_history with input of size 106 for LOIs [2021-11-23 03:47:21,977 INFO L197 IcfgInterpreter]: Interpreting procedure assert with input of size 115 for LOIs [2021-11-23 03:47:22,200 INFO L197 IcfgInterpreter]: Interpreting procedure read_side2_failed_history with input of size 105 for LOIs [2021-11-23 03:47:22,252 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 105 for LOIs [2021-11-23 03:47:22,299 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:48:10,354 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '165490#(and (<= 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)) (<= ~active_side_History_1~0 2) (<= ~s2s1~0 0) (<= ~s2s2~0 0) (<= 0 (+ ~s2s1_new~0 1)) (<= (+ ~s1p_new~0 1) 0) (<= 0 ~s1s1~0) (<= 0 ~cs2~0) (<= ~manual_selection_History_0~0 127) (<= 0 (+ ~s2p_new~0 1)) (= |assert_#in~arg| 0) (<= 0 ~side2_written~0) (<= ~s1s2~0 0) (<= 0 ~s2p~0) (<= 0 (+ ~manual_selection_History_2~0 128)) (<= ~s2p~0 0) (<= ~manual_selection_History_1~0 127) (<= 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)) (<= (+ ~s2s1_new~0 1) 0) (= (mod ~side2Failed_History_1~0 256) 0) (<= ~active_side_History_0~0 2) (<= ~manual_selection_History_2~0 127) (not (= 2 ~active_side_History_0~0)) (<= ~cs1~0 0) (<= 0 ~s2s2~0) (<= (+ ~nomsg~0 1) 0) (<= |#NULL.base| 0) (<= 0 (+ ~cs1_new~0 1)) (<= (+ ~cs1_new~0 1) 0) (<= 0 (+ ~nomsg~0 1)) (<= 0 (+ ~manual_selection_History_1~0 128)) (<= 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 [2021-11-23 03:48:10,354 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:48:10,355 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:48:10,355 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 7] total 11 [2021-11-23 03:48:10,355 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1370265965] [2021-11-23 03:48:10,355 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:48:10,356 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-23 03:48:10,356 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:48:10,356 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-23 03:48:10,357 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=617, Invalid=5083, Unknown=0, NotChecked=0, Total=5700 [2021-11-23 03:48:10,358 INFO L87 Difference]: Start difference. First operand 2880 states and 3457 transitions. Second operand has 11 states, 11 states have (on average 14.727272727272727) internal successors, (162), 11 states have internal predecessors, (162), 7 states have call successors, (36), 5 states have call predecessors, (36), 5 states have return successors, (35), 7 states have call predecessors, (35), 7 states have call successors, (35) [2021-11-23 03:48:12,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:48:12,552 INFO L93 Difference]: Finished difference Result 8514 states and 11382 transitions. [2021-11-23 03:48:12,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 03:48:12,553 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 14.727272727272727) internal successors, (162), 11 states have internal predecessors, (162), 7 states have call successors, (36), 5 states have call predecessors, (36), 5 states have return successors, (35), 7 states have call predecessors, (35), 7 states have call successors, (35) Word has length 144 [2021-11-23 03:48:12,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:48:12,578 INFO L225 Difference]: With dead ends: 8514 [2021-11-23 03:48:12,578 INFO L226 Difference]: Without dead ends: 5829 [2021-11-23 03:48:12,586 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 453 GetRequests, 355 SyntacticMatches, 12 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3065 ImplicationChecksByTransitivity, 48.4s TimeCoverageRelationStatistics Valid=826, Invalid=6830, Unknown=0, NotChecked=0, Total=7656 [2021-11-23 03:48:12,587 INFO L933 BasicCegarLoop]: 213 mSDtfsCounter, 3127 mSDsluCounter, 852 mSDsCounter, 0 mSdLazyCounter, 504 mSolverCounterSat, 1359 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3127 SdHoareTripleChecker+Valid, 1049 SdHoareTripleChecker+Invalid, 1863 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1359 IncrementalHoareTripleChecker+Valid, 504 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:48:12,587 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3127 Valid, 1049 Invalid, 1863 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1359 Valid, 504 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-23 03:48:12,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5829 states. [2021-11-23 03:48:13,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5829 to 3110. [2021-11-23 03:48:13,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3110 states, 2304 states have (on average 1.1979166666666667) internal successors, (2760), 2329 states have internal predecessors, (2760), 487 states have call successors, (487), 318 states have call predecessors, (487), 318 states have return successors, (487), 462 states have call predecessors, (487), 487 states have call successors, (487) [2021-11-23 03:48:13,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3110 states to 3110 states and 3734 transitions. [2021-11-23 03:48:13,138 INFO L78 Accepts]: Start accepts. Automaton has 3110 states and 3734 transitions. Word has length 144 [2021-11-23 03:48:13,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:48:13,138 INFO L470 AbstractCegarLoop]: Abstraction has 3110 states and 3734 transitions. [2021-11-23 03:48:13,139 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 14.727272727272727) internal successors, (162), 11 states have internal predecessors, (162), 7 states have call successors, (36), 5 states have call predecessors, (36), 5 states have return successors, (35), 7 states have call predecessors, (35), 7 states have call successors, (35) [2021-11-23 03:48:13,139 INFO L276 IsEmpty]: Start isEmpty. Operand 3110 states and 3734 transitions. [2021-11-23 03:48:13,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-23 03:48:13,144 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:48:13,144 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:48:13,181 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 03:48:13,360 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:48:13,360 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:48:13,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:48:13,361 INFO L85 PathProgramCache]: Analyzing trace with hash 1261611915, now seen corresponding path program 1 times [2021-11-23 03:48:13,361 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:48:13,361 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [355074104] [2021-11-23 03:48:13,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:48:13,361 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:48:13,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:48:13,615 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 16 proven. 4 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-23 03:48:13,615 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:48:13,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [355074104] [2021-11-23 03:48:13,616 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [355074104] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:48:13,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2066774655] [2021-11-23 03:48:13,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:48:13,616 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:48:13,616 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:48:13,617 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:48:13,640 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 03:48:13,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:48:13,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 720 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 03:48:13,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:48:14,104 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-11-23 03:48:14,105 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:48:14,105 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2066774655] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:48:14,105 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:48:14,105 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [9] total 14 [2021-11-23 03:48:14,105 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1809826472] [2021-11-23 03:48:14,105 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:48:14,106 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 03:48:14,106 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:48:14,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 03:48:14,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2021-11-23 03:48:14,107 INFO L87 Difference]: Start difference. First operand 3110 states and 3734 transitions. Second operand has 7 states, 7 states have (on average 12.571428571428571) internal successors, (88), 6 states have internal predecessors, (88), 3 states have call successors, (16), 3 states have call predecessors, (16), 4 states have return successors, (16), 4 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-23 03:48:15,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:48:15,073 INFO L93 Difference]: Finished difference Result 6708 states and 8361 transitions. [2021-11-23 03:48:15,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 03:48:15,073 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 12.571428571428571) internal successors, (88), 6 states have internal predecessors, (88), 3 states have call successors, (16), 3 states have call predecessors, (16), 4 states have return successors, (16), 4 states have call predecessors, (16), 3 states have call successors, (16) Word has length 144 [2021-11-23 03:48:15,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:48:15,087 INFO L225 Difference]: With dead ends: 6708 [2021-11-23 03:48:15,087 INFO L226 Difference]: Without dead ends: 3781 [2021-11-23 03:48:15,094 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=288, Unknown=0, NotChecked=0, Total=342 [2021-11-23 03:48:15,095 INFO L933 BasicCegarLoop]: 478 mSDtfsCounter, 446 mSDsluCounter, 1388 mSDsCounter, 0 mSdLazyCounter, 401 mSolverCounterSat, 138 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 446 SdHoareTripleChecker+Valid, 1800 SdHoareTripleChecker+Invalid, 539 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 138 IncrementalHoareTripleChecker+Valid, 401 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:48:15,095 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [446 Valid, 1800 Invalid, 539 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [138 Valid, 401 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:48:15,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3781 states. [2021-11-23 03:48:15,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3781 to 3110. [2021-11-23 03:48:15,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3110 states, 2304 states have (on average 1.1931423611111112) internal successors, (2749), 2329 states have internal predecessors, (2749), 487 states have call successors, (487), 318 states have call predecessors, (487), 318 states have return successors, (487), 462 states have call predecessors, (487), 487 states have call successors, (487) [2021-11-23 03:48:15,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3110 states to 3110 states and 3723 transitions. [2021-11-23 03:48:15,652 INFO L78 Accepts]: Start accepts. Automaton has 3110 states and 3723 transitions. Word has length 144 [2021-11-23 03:48:15,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:48:15,653 INFO L470 AbstractCegarLoop]: Abstraction has 3110 states and 3723 transitions. [2021-11-23 03:48:15,653 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 12.571428571428571) internal successors, (88), 6 states have internal predecessors, (88), 3 states have call successors, (16), 3 states have call predecessors, (16), 4 states have return successors, (16), 4 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-23 03:48:15,653 INFO L276 IsEmpty]: Start isEmpty. Operand 3110 states and 3723 transitions. [2021-11-23 03:48:15,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-23 03:48:15,659 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:48:15,659 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, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:48:15,697 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 03:48:15,872 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:48:15,872 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:48:15,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:48:15,872 INFO L85 PathProgramCache]: Analyzing trace with hash -396107047, now seen corresponding path program 1 times [2021-11-23 03:48:15,872 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:48:15,873 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1376069943] [2021-11-23 03:48:15,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:48:15,873 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:48:15,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:48:15,955 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-23 03:48:15,955 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:48:15,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1376069943] [2021-11-23 03:48:15,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1376069943] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:48:15,956 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:48:15,956 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 03:48:15,956 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [230713761] [2021-11-23 03:48:15,957 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:48:15,957 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 03:48:15,957 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:48:15,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 03:48:15,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:48:15,958 INFO L87 Difference]: Start difference. First operand 3110 states and 3723 transitions. Second operand has 7 states, 7 states have (on average 10.142857142857142) internal successors, (71), 6 states have internal predecessors, (71), 3 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (16), 3 states have call predecessors, (16), 2 states have call successors, (16) [2021-11-23 03:48:17,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:48:17,457 INFO L93 Difference]: Finished difference Result 10796 states and 13737 transitions. [2021-11-23 03:48:17,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 03:48:17,457 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.142857142857142) internal successors, (71), 6 states have internal predecessors, (71), 3 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (16), 3 states have call predecessors, (16), 2 states have call successors, (16) Word has length 145 [2021-11-23 03:48:17,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:48:17,486 INFO L225 Difference]: With dead ends: 10796 [2021-11-23 03:48:17,487 INFO L226 Difference]: Without dead ends: 7908 [2021-11-23 03:48:17,496 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2021-11-23 03:48:17,496 INFO L933 BasicCegarLoop]: 408 mSDtfsCounter, 462 mSDsluCounter, 1815 mSDsCounter, 0 mSdLazyCounter, 397 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 480 SdHoareTripleChecker+Valid, 2120 SdHoareTripleChecker+Invalid, 488 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 397 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:48:17,497 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [480 Valid, 2120 Invalid, 488 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 397 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 03:48:17,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7908 states. [2021-11-23 03:48:18,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7908 to 5185. [2021-11-23 03:48:18,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5185 states, 3801 states have (on average 1.185214417258616) internal successors, (4505), 3845 states have internal predecessors, (4505), 853 states have call successors, (853), 530 states have call predecessors, (853), 530 states have return successors, (853), 809 states have call predecessors, (853), 853 states have call successors, (853) [2021-11-23 03:48:18,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5185 states to 5185 states and 6211 transitions. [2021-11-23 03:48:18,449 INFO L78 Accepts]: Start accepts. Automaton has 5185 states and 6211 transitions. Word has length 145 [2021-11-23 03:48:18,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:48:18,449 INFO L470 AbstractCegarLoop]: Abstraction has 5185 states and 6211 transitions. [2021-11-23 03:48:18,450 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.142857142857142) internal successors, (71), 6 states have internal predecessors, (71), 3 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (16), 3 states have call predecessors, (16), 2 states have call successors, (16) [2021-11-23 03:48:18,450 INFO L276 IsEmpty]: Start isEmpty. Operand 5185 states and 6211 transitions. [2021-11-23 03:48:18,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-23 03:48:18,458 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:48:18,458 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, 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] [2021-11-23 03:48:18,458 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2021-11-23 03:48:18,458 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:48:18,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:48:18,459 INFO L85 PathProgramCache]: Analyzing trace with hash 1106790867, now seen corresponding path program 1 times [2021-11-23 03:48:18,459 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:48:18,459 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1041831041] [2021-11-23 03:48:18,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:48:18,460 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:48:18,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:48:18,660 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-23 03:48:18,661 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:48:18,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1041831041] [2021-11-23 03:48:18,661 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1041831041] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:48:18,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1569671932] [2021-11-23 03:48:18,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:48:18,662 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:48:18,662 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:48:18,668 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:48:18,688 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 03:48:18,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:48:18,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 720 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-23 03:48:18,898 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:48:20,090 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 6 proven. 74 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-23 03:48:20,090 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:48:21,141 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 10 proven. 21 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2021-11-23 03:48:21,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1569671932] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:48:21,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [700647494] [2021-11-23 03:48:21,145 INFO L159 IcfgInterpreter]: Started Sifa with 78 locations of interest [2021-11-23 03:48:21,145 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:48:21,146 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:48:21,146 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:48:21,146 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:49:27,092 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 74 for LOIs [2021-11-23 03:49:27,190 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 107 for LOIs [2021-11-23 03:49:27,202 INFO L197 IcfgInterpreter]: Interpreting procedure read_side1_failed_history with input of size 116 for LOIs [2021-11-23 03:49:27,516 INFO L197 IcfgInterpreter]: Interpreting procedure assert with input of size 115 for LOIs [2021-11-23 03:49:27,671 INFO L197 IcfgInterpreter]: Interpreting procedure read_side2_failed_history with input of size 105 for LOIs [2021-11-23 03:49:27,719 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 105 for LOIs [2021-11-23 03:49:27,767 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:50:22,718 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '215761#(and (<= 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)) (<= ~active_side_History_1~0 2) (<= ~s2s1~0 0) (<= ~s2s2~0 0) (<= 0 (+ ~s2s1_new~0 1)) (<= (+ ~s1p_new~0 1) 0) (<= 0 ~s1s1~0) (<= 0 ~cs2~0) (<= ~manual_selection_History_0~0 127) (<= 0 (+ ~s2p_new~0 1)) (= |assert_#in~arg| 0) (<= 0 ~side2_written~0) (<= ~s1s2~0 0) (<= 0 ~s2p~0) (<= 0 (+ ~manual_selection_History_2~0 128)) (<= ~s2p~0 0) (<= ~manual_selection_History_1~0 127) (<= 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)) (<= (+ ~s2s1_new~0 1) 0) (= (mod ~side2Failed_History_1~0 256) 0) (<= ~active_side_History_0~0 2) (<= ~manual_selection_History_2~0 127) (not (= 2 ~active_side_History_0~0)) (<= ~cs1~0 0) (<= 0 ~s2s2~0) (<= (+ ~nomsg~0 1) 0) (<= |#NULL.base| 0) (<= 0 (+ ~cs1_new~0 1)) (<= (+ ~cs1_new~0 1) 0) (<= 0 (+ ~nomsg~0 1)) (<= 0 (+ ~manual_selection_History_1~0 128)) (<= 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 [2021-11-23 03:50:22,718 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:50:22,718 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:50:22,718 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 14, 16] total 31 [2021-11-23 03:50:22,718 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524262297] [2021-11-23 03:50:22,718 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:50:22,719 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-23 03:50:22,719 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:50:22,720 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-23 03:50:22,721 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=922, Invalid=8390, Unknown=0, NotChecked=0, Total=9312 [2021-11-23 03:50:22,721 INFO L87 Difference]: Start difference. First operand 5185 states and 6211 transitions. Second operand has 31 states, 31 states have (on average 7.129032258064516) internal successors, (221), 30 states have internal predecessors, (221), 10 states have call successors, (52), 6 states have call predecessors, (52), 7 states have return successors, (51), 11 states have call predecessors, (51), 10 states have call successors, (51) [2021-11-23 03:50:40,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:50:40,880 INFO L93 Difference]: Finished difference Result 22286 states and 29975 transitions. [2021-11-23 03:50:40,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 205 states. [2021-11-23 03:50:40,880 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 7.129032258064516) internal successors, (221), 30 states have internal predecessors, (221), 10 states have call successors, (52), 6 states have call predecessors, (52), 7 states have return successors, (51), 11 states have call predecessors, (51), 10 states have call successors, (51) Word has length 147 [2021-11-23 03:50:40,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:50:40,938 INFO L225 Difference]: With dead ends: 22286 [2021-11-23 03:50:40,938 INFO L226 Difference]: Without dead ends: 17323 [2021-11-23 03:50:40,960 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 658 GetRequests, 357 SyntacticMatches, 6 SemanticMatches, 295 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36277 ImplicationChecksByTransitivity, 62.2s TimeCoverageRelationStatistics Valid=6145, Invalid=81767, Unknown=0, NotChecked=0, Total=87912 [2021-11-23 03:50:40,960 INFO L933 BasicCegarLoop]: 496 mSDtfsCounter, 7537 mSDsluCounter, 6646 mSDsCounter, 0 mSdLazyCounter, 10667 mSolverCounterSat, 5475 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7538 SdHoareTripleChecker+Valid, 7023 SdHoareTripleChecker+Invalid, 16142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 5475 IncrementalHoareTripleChecker+Valid, 10667 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.7s IncrementalHoareTripleChecker+Time [2021-11-23 03:50:40,961 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7538 Valid, 7023 Invalid, 16142 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [5475 Valid, 10667 Invalid, 0 Unknown, 0 Unchecked, 7.7s Time] [2021-11-23 03:50:40,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17323 states. [2021-11-23 03:50:41,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17323 to 5539. [2021-11-23 03:50:41,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5539 states, 4082 states have (on average 1.1832435080842725) internal successors, (4830), 4128 states have internal predecessors, (4830), 891 states have call successors, (891), 565 states have call predecessors, (891), 565 states have return successors, (891), 845 states have call predecessors, (891), 891 states have call successors, (891) [2021-11-23 03:50:41,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5539 states to 5539 states and 6612 transitions. [2021-11-23 03:50:41,970 INFO L78 Accepts]: Start accepts. Automaton has 5539 states and 6612 transitions. Word has length 147 [2021-11-23 03:50:41,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:50:41,970 INFO L470 AbstractCegarLoop]: Abstraction has 5539 states and 6612 transitions. [2021-11-23 03:50:41,970 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 7.129032258064516) internal successors, (221), 30 states have internal predecessors, (221), 10 states have call successors, (52), 6 states have call predecessors, (52), 7 states have return successors, (51), 11 states have call predecessors, (51), 10 states have call successors, (51) [2021-11-23 03:50:41,971 INFO L276 IsEmpty]: Start isEmpty. Operand 5539 states and 6612 transitions. [2021-11-23 03:50:41,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2021-11-23 03:50:41,980 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:50:41,980 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:50:42,015 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 03:50:42,208 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-23 03:50:42,208 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:50:42,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:50:42,209 INFO L85 PathProgramCache]: Analyzing trace with hash 1199644475, now seen corresponding path program 1 times [2021-11-23 03:50:42,209 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:50:42,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1496063174] [2021-11-23 03:50:42,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:50:42,209 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:50:42,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:50:42,497 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 16 proven. 4 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-11-23 03:50:42,497 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:50:42,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1496063174] [2021-11-23 03:50:42,498 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1496063174] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:50:42,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1875397393] [2021-11-23 03:50:42,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:50:42,498 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:50:42,498 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:50:42,499 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:50:42,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff49fc4c-0166-4bb6-979e-6e6ddf151c81/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 03:50:42,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:50:42,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 738 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 03:50:42,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:50:42,982 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 79 proven. 23 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 03:50:42,983 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:50:43,306 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 25 proven. 9 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2021-11-23 03:50:43,307 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1875397393] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:50:43,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [850718805] [2021-11-23 03:50:43,308 INFO L159 IcfgInterpreter]: Started Sifa with 83 locations of interest [2021-11-23 03:50:43,308 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:50:43,309 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:50:43,309 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:50:43,309 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs