./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.ufo.UNBOUNDED.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_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/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_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/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_9f91b70d-e2a8-43c2-ab46-5d10e985341d/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 5d72e5e7abaa750c1c0009f2e3addca35915e1b949637f5a49ed633aadc3fe53 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:17:55,181 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:17:55,183 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:17:55,231 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:17:55,231 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:17:55,236 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:17:55,238 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:17:55,242 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:17:55,246 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:17:55,252 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:17:55,254 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:17:55,256 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:17:55,257 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:17:55,260 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:17:55,262 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:17:55,267 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:17:55,269 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:17:55,270 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:17:55,273 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:17:55,281 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:17:55,284 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:17:55,285 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:17:55,288 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:17:55,290 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:17:55,299 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:17:55,300 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:17:55,300 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:17:55,302 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:17:55,303 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:17:55,305 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:17:55,306 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:17:55,307 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:17:55,309 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:17:55,310 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:17:55,312 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:17:55,312 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:17:55,313 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:17:55,314 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:17:55,314 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:17:55,315 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:17:55,316 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:17:55,317 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:17:55,365 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:17:55,365 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:17:55,366 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:17:55,366 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:17:55,367 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:17:55,367 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:17:55,367 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:17:55,367 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:17:55,368 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:17:55,368 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:17:55,368 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:17:55,368 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:17:55,369 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:17:55,369 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:17:55,369 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:17:55,369 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:17:55,370 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:17:55,370 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:17:55,371 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:17:55,371 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:17:55,371 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:17:55,372 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:17:55,372 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:17:55,372 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:17:55,372 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:17:55,372 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:17:55,373 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:17:55,373 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:17:55,373 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:17:55,373 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:17:55,374 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:17:55,374 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:17:55,374 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:17:55,374 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:17:55,375 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:17:55,375 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:17:55,375 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:17:55,375 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:17:55,376 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:17:55,376 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:17:55,376 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:17:55,376 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_9f91b70d-e2a8-43c2-ab46-5d10e985341d/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5d72e5e7abaa750c1c0009f2e3addca35915e1b949637f5a49ed633aadc3fe53 [2021-11-23 02:17:55,638 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:17:55,666 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:17:55,669 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:17:55,670 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:17:55,671 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:17:55,673 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.ufo.UNBOUNDED.pals.c [2021-11-23 02:17:55,748 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/data/b29ea138c/048f6ea3fbbe48cea98cec702ba0a1b3/FLAG7128c88bd [2021-11-23 02:17:56,217 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:17:56,231 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.ufo.UNBOUNDED.pals.c [2021-11-23 02:17:56,247 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/data/b29ea138c/048f6ea3fbbe48cea98cec702ba0a1b3/FLAG7128c88bd [2021-11-23 02:17:56,572 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/data/b29ea138c/048f6ea3fbbe48cea98cec702ba0a1b3 [2021-11-23 02:17:56,573 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:17:56,575 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:17:56,592 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:17:56,592 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:17:56,595 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:17:56,596 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:17:56" (1/1) ... [2021-11-23 02:17:56,597 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@78ea0ee2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:17:56, skipping insertion in model container [2021-11-23 02:17:56,597 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:17:56" (1/1) ... [2021-11-23 02:17:56,604 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:17:56,666 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:17:57,014 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_9f91b70d-e2a8-43c2-ab46-5d10e985341d/sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.ufo.UNBOUNDED.pals.c[14680,14693] [2021-11-23 02:17:57,017 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:17:57,028 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:17:57,110 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_9f91b70d-e2a8-43c2-ab46-5d10e985341d/sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.ufo.UNBOUNDED.pals.c[14680,14693] [2021-11-23 02:17:57,111 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:17:57,133 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:17:57,134 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:17:57 WrapperNode [2021-11-23 02:17:57,134 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:17:57,135 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:17:57,136 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:17:57,136 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:17:57,143 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:17:57" (1/1) ... [2021-11-23 02:17:57,170 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:17:57" (1/1) ... [2021-11-23 02:17:57,231 INFO L137 Inliner]: procedures = 32, calls = 48, calls flagged for inlining = 12, calls inlined = 12, statements flattened = 535 [2021-11-23 02:17:57,241 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:17:57,242 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:17:57,243 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:17:57,243 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:17:57,252 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:17:57" (1/1) ... [2021-11-23 02:17:57,252 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:17:57" (1/1) ... [2021-11-23 02:17:57,258 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:17:57" (1/1) ... [2021-11-23 02:17:57,259 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:17:57" (1/1) ... [2021-11-23 02:17:57,272 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:17:57" (1/1) ... [2021-11-23 02:17:57,281 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:17:57" (1/1) ... [2021-11-23 02:17:57,285 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:17:57" (1/1) ... [2021-11-23 02:17:57,291 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:17:57,292 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:17:57,293 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:17:57,293 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:17:57,294 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:17:57" (1/1) ... [2021-11-23 02:17:57,302 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:17:57,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:17:57,336 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:17:57,354 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:17:57,392 INFO L130 BoogieDeclarations]: Found specification of procedure read_manual_selection_history [2021-11-23 02:17:57,393 INFO L138 BoogieDeclarations]: Found implementation of procedure read_manual_selection_history [2021-11-23 02:17:57,393 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:17:57,393 INFO L130 BoogieDeclarations]: Found specification of procedure read_side2_failed_history [2021-11-23 02:17:57,393 INFO L138 BoogieDeclarations]: Found implementation of procedure read_side2_failed_history [2021-11-23 02:17:57,393 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2021-11-23 02:17:57,394 INFO L138 BoogieDeclarations]: Found implementation of procedure assert [2021-11-23 02:17:57,394 INFO L130 BoogieDeclarations]: Found specification of procedure flip_the_side [2021-11-23 02:17:57,394 INFO L138 BoogieDeclarations]: Found implementation of procedure flip_the_side [2021-11-23 02:17:57,394 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-23 02:17:57,394 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-23 02:17:57,395 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:17:57,395 INFO L130 BoogieDeclarations]: Found specification of procedure read_side1_failed_history [2021-11-23 02:17:57,395 INFO L138 BoogieDeclarations]: Found implementation of procedure read_side1_failed_history [2021-11-23 02:17:57,395 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:17:57,395 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:17:57,396 INFO L130 BoogieDeclarations]: Found specification of procedure read_active_side_history [2021-11-23 02:17:57,396 INFO L138 BoogieDeclarations]: Found implementation of procedure read_active_side_history [2021-11-23 02:17:57,505 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:17:57,507 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:17:58,224 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:17:58,548 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:17:58,548 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 02:17:58,551 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:17:58 BoogieIcfgContainer [2021-11-23 02:17:58,554 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:17:58,556 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:17:58,556 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:17:58,560 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:17:58,561 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:17:56" (1/3) ... [2021-11-23 02:17:58,562 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6db54531 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:17:58, skipping insertion in model container [2021-11-23 02:17:58,562 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:17:57" (2/3) ... [2021-11-23 02:17:58,562 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6db54531 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:17:58, skipping insertion in model container [2021-11-23 02:17:58,563 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:17:58" (3/3) ... [2021-11-23 02:17:58,564 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_STARTPALS_ActiveStandby.ufo.UNBOUNDED.pals.c [2021-11-23 02:17:58,575 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:17:58,576 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:17:58,628 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:17:58,634 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 02:17:58,634 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:17:58,656 INFO L276 IsEmpty]: Start isEmpty. Operand has 149 states, 109 states have (on average 1.5412844036697249) internal successors, (168), 111 states have internal predecessors, (168), 31 states have call successors, (31), 7 states have call predecessors, (31), 7 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2021-11-23 02:17:58,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-23 02:17:58,662 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:17:58,663 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 02:17:58,664 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:17:58,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:17:58,668 INFO L85 PathProgramCache]: Analyzing trace with hash -1402390635, now seen corresponding path program 1 times [2021-11-23 02:17:58,676 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:17:58,676 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1269771197] [2021-11-23 02:17:58,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:17:58,677 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:17:58,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:17:59,123 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:17:59,124 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:17:59,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1269771197] [2021-11-23 02:17:59,126 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1269771197] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:17:59,126 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:17:59,126 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:17:59,128 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140009699] [2021-11-23 02:17:59,129 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:17:59,133 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:17:59,134 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:17:59,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:17:59,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:17:59,173 INFO L87 Difference]: Start difference. First operand has 149 states, 109 states have (on average 1.5412844036697249) internal successors, (168), 111 states have internal predecessors, (168), 31 states have call successors, (31), 7 states have call predecessors, (31), 7 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) Second operand has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:17:59,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:17:59,383 INFO L93 Difference]: Finished difference Result 298 states and 487 transitions. [2021-11-23 02:17:59,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:17:59,388 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 02:17:59,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:17:59,401 INFO L225 Difference]: With dead ends: 298 [2021-11-23 02:17:59,402 INFO L226 Difference]: Without dead ends: 152 [2021-11-23 02:17:59,412 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 02:17:59,417 INFO L933 BasicCegarLoop]: 211 mSDtfsCounter, 5 mSDsluCounter, 434 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 623 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:17:59,419 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 623 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:17:59,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-11-23 02:17:59,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 152. [2021-11-23 02:17:59,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 112 states have (on average 1.5089285714285714) internal successors, (169), 113 states have internal predecessors, (169), 31 states have call successors, (31), 8 states have call predecessors, (31), 8 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2021-11-23 02:17:59,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 231 transitions. [2021-11-23 02:17:59,519 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 231 transitions. Word has length 19 [2021-11-23 02:17:59,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:17:59,520 INFO L470 AbstractCegarLoop]: Abstraction has 152 states and 231 transitions. [2021-11-23 02:17:59,520 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 02:17:59,521 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 231 transitions. [2021-11-23 02:17:59,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-23 02:17:59,523 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:17:59,524 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 02:17:59,525 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:17:59,525 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:17:59,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:17:59,529 INFO L85 PathProgramCache]: Analyzing trace with hash 698242933, now seen corresponding path program 1 times [2021-11-23 02:17:59,529 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:17:59,529 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [905659956] [2021-11-23 02:17:59,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:17:59,530 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:17:59,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:17:59,701 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 02:17:59,701 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:17:59,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [905659956] [2021-11-23 02:17:59,702 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [905659956] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:17:59,702 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:17:59,703 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:17:59,703 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818555624] [2021-11-23 02:17:59,703 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:17:59,704 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:17:59,705 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:17:59,706 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:17:59,706 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:17:59,707 INFO L87 Difference]: Start difference. First operand 152 states and 231 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 02:18:00,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:18:00,054 INFO L93 Difference]: Finished difference Result 432 states and 672 transitions. [2021-11-23 02:18:00,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:18:00,054 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 02:18:00,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:18:00,062 INFO L225 Difference]: With dead ends: 432 [2021-11-23 02:18:00,062 INFO L226 Difference]: Without dead ends: 283 [2021-11-23 02:18:00,067 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 02:18:00,069 INFO L933 BasicCegarLoop]: 209 mSDtfsCounter, 566 mSDsluCounter, 389 mSDsCounter, 0 mSdLazyCounter, 176 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 566 SdHoareTripleChecker+Valid, 593 SdHoareTripleChecker+Invalid, 244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:18:00,081 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [566 Valid, 593 Invalid, 244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 176 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:18:00,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2021-11-23 02:18:00,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 186. [2021-11-23 02:18:00,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 141 states have (on average 1.5106382978723405) internal successors, (213), 141 states have internal predecessors, (213), 34 states have call successors, (34), 10 states have call predecessors, (34), 10 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-23 02:18:00,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 281 transitions. [2021-11-23 02:18:00,109 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 281 transitions. Word has length 30 [2021-11-23 02:18:00,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:18:00,110 INFO L470 AbstractCegarLoop]: Abstraction has 186 states and 281 transitions. [2021-11-23 02:18:00,110 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 02:18:00,110 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 281 transitions. [2021-11-23 02:18:00,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-23 02:18:00,112 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:18:00,112 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 02:18:00,113 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 02:18:00,113 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:18:00,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:18:00,114 INFO L85 PathProgramCache]: Analyzing trace with hash -1421239568, now seen corresponding path program 1 times [2021-11-23 02:18:00,114 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:18:00,114 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1082109415] [2021-11-23 02:18:00,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:00,115 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:18:00,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:00,233 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 02:18:00,234 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:18:00,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1082109415] [2021-11-23 02:18:00,234 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1082109415] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:18:00,236 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:18:00,236 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:18:00,237 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319778422] [2021-11-23 02:18:00,237 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:18:00,240 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:18:00,241 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:18:00,242 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:18:00,242 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:18:00,242 INFO L87 Difference]: Start difference. First operand 186 states and 281 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 02:18:00,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:18:00,532 INFO L93 Difference]: Finished difference Result 432 states and 670 transitions. [2021-11-23 02:18:00,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:18:00,533 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 02:18:00,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:18:00,536 INFO L225 Difference]: With dead ends: 432 [2021-11-23 02:18:00,536 INFO L226 Difference]: Without dead ends: 283 [2021-11-23 02:18:00,537 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 02:18:00,538 INFO L933 BasicCegarLoop]: 210 mSDtfsCounter, 562 mSDsluCounter, 391 mSDsCounter, 0 mSdLazyCounter, 172 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 562 SdHoareTripleChecker+Valid, 596 SdHoareTripleChecker+Invalid, 240 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 172 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:18:00,539 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [562 Valid, 596 Invalid, 240 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 172 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:18:00,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2021-11-23 02:18:00,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 186. [2021-11-23 02:18:00,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 141 states have (on average 1.50354609929078) internal successors, (212), 141 states have internal predecessors, (212), 34 states have call successors, (34), 10 states have call predecessors, (34), 10 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-23 02:18:00,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 280 transitions. [2021-11-23 02:18:00,562 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 280 transitions. Word has length 31 [2021-11-23 02:18:00,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:18:00,562 INFO L470 AbstractCegarLoop]: Abstraction has 186 states and 280 transitions. [2021-11-23 02:18:00,562 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 02:18:00,563 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 280 transitions. [2021-11-23 02:18:00,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-23 02:18:00,564 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:18:00,564 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 02:18:00,564 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 02:18:00,565 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:18:00,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:18:00,565 INFO L85 PathProgramCache]: Analyzing trace with hash 1401044311, now seen corresponding path program 1 times [2021-11-23 02:18:00,565 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:18:00,566 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1105826015] [2021-11-23 02:18:00,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:00,566 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:18:00,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:00,651 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 02:18:00,651 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:18:00,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1105826015] [2021-11-23 02:18:00,652 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1105826015] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:18:00,652 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:18:00,652 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:18:00,652 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1647084004] [2021-11-23 02:18:00,652 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:18:00,653 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:18:00,653 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:18:00,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:18:00,654 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:18:00,654 INFO L87 Difference]: Start difference. First operand 186 states and 280 transitions. Second operand has 4 states, 4 states have (on average 6.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 02:18:00,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:18:00,761 INFO L93 Difference]: Finished difference Result 340 states and 514 transitions. [2021-11-23 02:18:00,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:18:00,762 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 02:18:00,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:18:00,766 INFO L225 Difference]: With dead ends: 340 [2021-11-23 02:18:00,766 INFO L226 Difference]: Without dead ends: 191 [2021-11-23 02:18:00,767 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 02:18:00,777 INFO L933 BasicCegarLoop]: 213 mSDtfsCounter, 6 mSDsluCounter, 444 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 635 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:18:00,778 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 635 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:18:00,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-11-23 02:18:00,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 191. [2021-11-23 02:18:00,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 145 states have (on average 1.4896551724137932) internal successors, (216), 145 states have internal predecessors, (216), 34 states have call successors, (34), 11 states have call predecessors, (34), 11 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-23 02:18:00,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 284 transitions. [2021-11-23 02:18:00,802 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 284 transitions. Word has length 33 [2021-11-23 02:18:00,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:18:00,803 INFO L470 AbstractCegarLoop]: Abstraction has 191 states and 284 transitions. [2021-11-23 02:18:00,803 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 02:18:00,803 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 284 transitions. [2021-11-23 02:18:00,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 02:18:00,809 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:18:00,810 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 02:18:00,810 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 02:18:00,810 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:18:00,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:18:00,811 INFO L85 PathProgramCache]: Analyzing trace with hash -1975676803, now seen corresponding path program 1 times [2021-11-23 02:18:00,811 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:18:00,811 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [803628450] [2021-11-23 02:18:00,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:00,811 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:18:00,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:00,947 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 02:18:00,947 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:18:00,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [803628450] [2021-11-23 02:18:00,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [803628450] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:18:00,948 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:18:00,948 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:18:00,948 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400658756] [2021-11-23 02:18:00,948 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:18:00,950 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:18:00,953 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:18:00,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:18:00,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:18:00,954 INFO L87 Difference]: Start difference. First operand 191 states and 284 transitions. Second operand has 4 states, 4 states have (on average 7.5) internal successors, (30), 3 states have internal predecessors, (30), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-23 02:18:01,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:18:01,037 INFO L93 Difference]: Finished difference Result 350 states and 525 transitions. [2021-11-23 02:18:01,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:18:01,038 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 02:18:01,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:18:01,040 INFO L225 Difference]: With dead ends: 350 [2021-11-23 02:18:01,045 INFO L226 Difference]: Without dead ends: 196 [2021-11-23 02:18:01,047 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 02:18:01,048 INFO L933 BasicCegarLoop]: 210 mSDtfsCounter, 6 mSDsluCounter, 433 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 621 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:18:01,049 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 621 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:18:01,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-11-23 02:18:01,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2021-11-23 02:18:01,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 149 states have (on average 1.476510067114094) internal successors, (220), 149 states have internal predecessors, (220), 34 states have call successors, (34), 12 states have call predecessors, (34), 12 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-23 02:18:01,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 288 transitions. [2021-11-23 02:18:01,084 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 288 transitions. Word has length 41 [2021-11-23 02:18:01,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:18:01,089 INFO L470 AbstractCegarLoop]: Abstraction has 196 states and 288 transitions. [2021-11-23 02:18:01,089 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 02:18:01,090 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 288 transitions. [2021-11-23 02:18:01,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-23 02:18:01,094 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:18:01,095 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 02:18:01,095 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 02:18:01,095 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:18:01,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:18:01,096 INFO L85 PathProgramCache]: Analyzing trace with hash -819289017, now seen corresponding path program 1 times [2021-11-23 02:18:01,097 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:18:01,097 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1003518795] [2021-11-23 02:18:01,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:01,097 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:18:01,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:01,217 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 02:18:01,217 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:18:01,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1003518795] [2021-11-23 02:18:01,218 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1003518795] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:18:01,218 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:18:01,218 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:18:01,218 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604425853] [2021-11-23 02:18:01,218 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:18:01,219 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:18:01,219 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:18:01,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:18:01,220 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:18:01,220 INFO L87 Difference]: Start difference. First operand 196 states and 288 transitions. Second operand has 4 states, 4 states have (on average 9.0) internal successors, (36), 3 states have internal predecessors, (36), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-23 02:18:01,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:18:01,302 INFO L93 Difference]: Finished difference Result 359 states and 529 transitions. [2021-11-23 02:18:01,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:18:01,303 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 02:18:01,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:18:01,307 INFO L225 Difference]: With dead ends: 359 [2021-11-23 02:18:01,308 INFO L226 Difference]: Without dead ends: 200 [2021-11-23 02:18:01,309 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 02:18:01,310 INFO L933 BasicCegarLoop]: 215 mSDtfsCounter, 5 mSDsluCounter, 437 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 630 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:18:01,311 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 630 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:18:01,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-11-23 02:18:01,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 200. [2021-11-23 02:18:01,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 152 states have (on average 1.4671052631578947) internal successors, (223), 152 states have internal predecessors, (223), 34 states have call successors, (34), 13 states have call predecessors, (34), 13 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-23 02:18:01,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 291 transitions. [2021-11-23 02:18:01,329 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 291 transitions. Word has length 49 [2021-11-23 02:18:01,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:18:01,330 INFO L470 AbstractCegarLoop]: Abstraction has 200 states and 291 transitions. [2021-11-23 02:18:01,330 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 02:18:01,330 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 291 transitions. [2021-11-23 02:18:01,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-23 02:18:01,332 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:18:01,332 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 02:18:01,332 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 02:18:01,332 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:18:01,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:18:01,333 INFO L85 PathProgramCache]: Analyzing trace with hash 1577170286, now seen corresponding path program 1 times [2021-11-23 02:18:01,333 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:18:01,333 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1596778053] [2021-11-23 02:18:01,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:01,334 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:18:01,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:01,472 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 02:18:01,473 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:18:01,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1596778053] [2021-11-23 02:18:01,473 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1596778053] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:18:01,473 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:18:01,473 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:18:01,473 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2017142206] [2021-11-23 02:18:01,474 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:18:01,474 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:18:01,474 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:18:01,475 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:18:01,475 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:18:01,475 INFO L87 Difference]: Start difference. First operand 200 states and 291 transitions. Second operand has 4 states, 4 states have (on average 9.0) internal successors, (36), 3 states have internal predecessors, (36), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-23 02:18:01,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:18:01,552 INFO L93 Difference]: Finished difference Result 368 states and 539 transitions. [2021-11-23 02:18:01,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:18:01,553 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 02:18:01,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:18:01,555 INFO L225 Difference]: With dead ends: 368 [2021-11-23 02:18:01,556 INFO L226 Difference]: Without dead ends: 205 [2021-11-23 02:18:01,556 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 02:18:01,557 INFO L933 BasicCegarLoop]: 210 mSDtfsCounter, 6 mSDsluCounter, 433 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 621 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:18:01,558 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 621 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:18:01,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2021-11-23 02:18:01,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 205. [2021-11-23 02:18:01,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 156 states have (on average 1.455128205128205) internal successors, (227), 156 states have internal predecessors, (227), 34 states have call successors, (34), 14 states have call predecessors, (34), 14 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-23 02:18:01,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 295 transitions. [2021-11-23 02:18:01,572 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 295 transitions. Word has length 49 [2021-11-23 02:18:01,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:18:01,573 INFO L470 AbstractCegarLoop]: Abstraction has 205 states and 295 transitions. [2021-11-23 02:18:01,573 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 02:18:01,573 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 295 transitions. [2021-11-23 02:18:01,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-23 02:18:01,574 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:18:01,575 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 02:18:01,575 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 02:18:01,575 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:18:01,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:18:01,576 INFO L85 PathProgramCache]: Analyzing trace with hash 46065614, now seen corresponding path program 1 times [2021-11-23 02:18:01,576 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:18:01,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1793624670] [2021-11-23 02:18:01,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:01,577 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:18:01,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:01,665 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 02:18:01,665 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:18:01,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1793624670] [2021-11-23 02:18:01,665 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1793624670] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:18:01,666 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:18:01,666 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:18:01,666 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058770403] [2021-11-23 02:18:01,666 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:18:01,666 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:18:01,667 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:18:01,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:18:01,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:18:01,667 INFO L87 Difference]: Start difference. First operand 205 states and 295 transitions. Second operand has 4 states, 4 states have (on average 9.5) internal successors, (38), 3 states have internal predecessors, (38), 2 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-23 02:18:01,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:18:01,737 INFO L93 Difference]: Finished difference Result 379 states and 546 transitions. [2021-11-23 02:18:01,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:18:01,737 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 02:18:01,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:18:01,743 INFO L225 Difference]: With dead ends: 379 [2021-11-23 02:18:01,743 INFO L226 Difference]: Without dead ends: 211 [2021-11-23 02:18:01,744 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 02:18:01,745 INFO L933 BasicCegarLoop]: 214 mSDtfsCounter, 7 mSDsluCounter, 440 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 632 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:18:01,745 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 632 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:18:01,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2021-11-23 02:18:01,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 211. [2021-11-23 02:18:01,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 161 states have (on average 1.4409937888198758) internal successors, (232), 161 states have internal predecessors, (232), 34 states have call successors, (34), 15 states have call predecessors, (34), 15 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-23 02:18:01,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 300 transitions. [2021-11-23 02:18:01,773 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 300 transitions. Word has length 57 [2021-11-23 02:18:01,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:18:01,774 INFO L470 AbstractCegarLoop]: Abstraction has 211 states and 300 transitions. [2021-11-23 02:18:01,774 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 02:18:01,774 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 300 transitions. [2021-11-23 02:18:01,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 02:18:01,776 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:18:01,776 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 02:18:01,776 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-23 02:18:01,776 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:18:01,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:18:01,777 INFO L85 PathProgramCache]: Analyzing trace with hash 202306747, now seen corresponding path program 1 times [2021-11-23 02:18:01,777 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:18:01,777 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [235665002] [2021-11-23 02:18:01,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:01,777 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:18:01,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:02,110 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 02:18:02,111 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:18:02,111 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [235665002] [2021-11-23 02:18:02,111 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [235665002] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:18:02,111 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1490225938] [2021-11-23 02:18:02,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:02,112 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:18:02,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:18:02,114 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:18:02,137 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:18:02,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:02,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 02:18:02,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:18:02,578 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 02:18:02,578 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:18:02,578 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1490225938] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:18:02,578 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:18:02,579 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [9] total 14 [2021-11-23 02:18:02,579 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2045382893] [2021-11-23 02:18:02,579 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:18:02,579 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:18:02,580 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:18:02,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:18:02,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2021-11-23 02:18:02,581 INFO L87 Difference]: Start difference. First operand 211 states and 300 transitions. Second operand has 8 states, 6 states have (on average 7.5) internal successors, (45), 8 states have internal predecessors, (45), 4 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-23 02:18:02,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:18:02,862 INFO L93 Difference]: Finished difference Result 598 states and 836 transitions. [2021-11-23 02:18:02,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 02:18:02,863 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 02:18:02,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:18:02,867 INFO L225 Difference]: With dead ends: 598 [2021-11-23 02:18:02,867 INFO L226 Difference]: Without dead ends: 398 [2021-11-23 02:18:02,868 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 02:18:02,870 INFO L933 BasicCegarLoop]: 241 mSDtfsCounter, 222 mSDsluCounter, 945 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 223 SdHoareTripleChecker+Valid, 1144 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:18:02,871 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [223 Valid, 1144 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 163 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:18:02,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 398 states. [2021-11-23 02:18:02,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 398 to 395. [2021-11-23 02:18:02,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 395 states, 299 states have (on average 1.4214046822742474) internal successors, (425), 300 states have internal predecessors, (425), 65 states have call successors, (65), 30 states have call predecessors, (65), 30 states have return successors, (65), 64 states have call predecessors, (65), 65 states have call successors, (65) [2021-11-23 02:18:02,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 555 transitions. [2021-11-23 02:18:02,901 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 555 transitions. Word has length 60 [2021-11-23 02:18:02,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:18:02,902 INFO L470 AbstractCegarLoop]: Abstraction has 395 states and 555 transitions. [2021-11-23 02:18:02,902 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 02:18:02,902 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 555 transitions. [2021-11-23 02:18:02,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-23 02:18:02,904 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:18:02,904 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 02:18:02,942 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:18:03,117 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:18:03,117 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:18:03,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:18:03,118 INFO L85 PathProgramCache]: Analyzing trace with hash 1935039856, now seen corresponding path program 1 times [2021-11-23 02:18:03,118 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:18:03,118 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657090072] [2021-11-23 02:18:03,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:03,118 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:18:03,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:03,469 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 02:18:03,469 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:18:03,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [657090072] [2021-11-23 02:18:03,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [657090072] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:18:03,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [63887176] [2021-11-23 02:18:03,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:03,470 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:18:03,471 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:18:03,471 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:18:03,492 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:18:03,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:03,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 400 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 02:18:03,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:18:04,153 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 02:18:04,154 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:18:04,419 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 02:18:04,420 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [63887176] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:18:04,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [14631809] [2021-11-23 02:18:04,445 INFO L159 IcfgInterpreter]: Started Sifa with 57 locations of interest [2021-11-23 02:18:04,445 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:18:04,450 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:18:04,456 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:18:04,456 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:18:08,797 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 111 for LOIs [2021-11-23 02:18:08,952 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 108 for LOIs [2021-11-23 02:18:08,971 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 104 for LOIs [2021-11-23 02:18:09,041 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:18:22,720 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [14631809] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:18:22,720 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:18:22,720 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [9, 9, 9] total 37 [2021-11-23 02:18:22,721 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222127998] [2021-11-23 02:18:22,721 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:18:22,722 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-23 02:18:22,722 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:18:22,723 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-23 02:18:22,723 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1200, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 02:18:22,724 INFO L87 Difference]: Start difference. First operand 395 states and 555 transitions. Second operand has 26 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 18 states have internal predecessors, (43), 5 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-23 02:18:29,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:18:29,239 INFO L93 Difference]: Finished difference Result 819 states and 1158 transitions. [2021-11-23 02:18:29,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 02:18:29,240 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 02:18:29,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:18:29,244 INFO L225 Difference]: With dead ends: 819 [2021-11-23 02:18:29,244 INFO L226 Difference]: Without dead ends: 464 [2021-11-23 02:18:29,246 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 154 SyntacticMatches, 4 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 337 ImplicationChecksByTransitivity, 16.3s TimeCoverageRelationStatistics Valid=155, Invalid=1405, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 02:18:29,247 INFO L933 BasicCegarLoop]: 279 mSDtfsCounter, 134 mSDsluCounter, 3259 mSDsCounter, 0 mSdLazyCounter, 2070 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 3521 SdHoareTripleChecker+Invalid, 2123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 2070 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:18:29,247 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 3521 Invalid, 2123 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [53 Valid, 2070 Invalid, 0 Unknown, 0 Unchecked, 3.9s Time] [2021-11-23 02:18:29,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 464 states. [2021-11-23 02:18:29,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 464 to 441. [2021-11-23 02:18:29,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 441 states, 330 states have (on average 1.4) internal successors, (462), 331 states have internal predecessors, (462), 78 states have call successors, (78), 32 states have call predecessors, (78), 32 states have return successors, (78), 77 states have call predecessors, (78), 78 states have call successors, (78) [2021-11-23 02:18:29,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441 states to 441 states and 618 transitions. [2021-11-23 02:18:29,295 INFO L78 Accepts]: Start accepts. Automaton has 441 states and 618 transitions. Word has length 62 [2021-11-23 02:18:29,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:18:29,296 INFO L470 AbstractCegarLoop]: Abstraction has 441 states and 618 transitions. [2021-11-23 02:18:29,296 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 02:18:29,296 INFO L276 IsEmpty]: Start isEmpty. Operand 441 states and 618 transitions. [2021-11-23 02:18:29,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-23 02:18:29,298 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:18:29,298 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 02:18:29,321 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:18:29,501 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-23 02:18:29,501 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:18:29,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:18:29,502 INFO L85 PathProgramCache]: Analyzing trace with hash -1493661489, now seen corresponding path program 1 times [2021-11-23 02:18:29,502 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:18:29,502 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1002540213] [2021-11-23 02:18:29,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:29,502 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:18:29,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:29,684 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 02:18:29,685 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:18:29,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1002540213] [2021-11-23 02:18:29,685 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1002540213] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:18:29,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2084628356] [2021-11-23 02:18:29,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:29,686 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:18:29,686 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:18:29,687 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:18:29,710 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:18:29,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:29,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 400 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 02:18:29,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:18:30,157 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 02:18:30,157 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:18:30,382 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 02:18:30,382 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2084628356] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:18:30,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [342683277] [2021-11-23 02:18:30,387 INFO L159 IcfgInterpreter]: Started Sifa with 57 locations of interest [2021-11-23 02:18:30,389 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:18:30,390 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:18:30,391 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:18:30,391 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:18:48,464 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 174 for LOIs [2021-11-23 02:18:49,998 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-23 02:18:49,999 INFO L197 IcfgInterpreter]: Interpreting procedure read_side1_failed_history with input of size 21 for LOIs [2021-11-23 02:18:50,008 INFO L197 IcfgInterpreter]: Interpreting procedure assert with input of size 30 for LOIs [2021-11-23 02:18:50,019 INFO L197 IcfgInterpreter]: Interpreting procedure read_side2_failed_history with input of size 26 for LOIs [2021-11-23 02:18:50,028 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 15 for LOIs [2021-11-23 02:18:50,035 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:19:02,412 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10108#(and (= |assert_#in~arg| 0) (<= ~manual_selection_History_1~0 127) (<= ~active_side_History_1~0 127) (<= 0 ~active_side_History_0~0) (= assert_~arg |assert_#in~arg|) (not (= (mod ~side1Failed_History_1~0 256) 0)) (= (mod ~side2Failed_History_1~0 256) 0) (<= ~active_side_History_0~0 2) (not (= 2 ~active_side_History_0~0)) (not (= ~manual_selection_History_1~0 0)) (<= 0 (+ ~manual_selection_History_1~0 128)) (<= 0 (+ ~active_side_History_1~0 128)))' at error location [2021-11-23 02:19:02,412 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:19:02,412 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:19:02,412 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 13 [2021-11-23 02:19:02,413 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [672961686] [2021-11-23 02:19:02,413 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:19:02,413 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-23 02:19:02,413 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:19:02,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-23 02:19:02,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=2829, Unknown=0, NotChecked=0, Total=3080 [2021-11-23 02:19:02,416 INFO L87 Difference]: Start difference. First operand 441 states and 618 transitions. Second operand has 13 states, 9 states have (on average 7.444444444444445) internal successors, (67), 12 states have internal predecessors, (67), 4 states have call successors, (15), 3 states have call predecessors, (15), 8 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-23 02:19:02,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:19:02,988 INFO L93 Difference]: Finished difference Result 1153 states and 1628 transitions. [2021-11-23 02:19:02,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 02:19:02,988 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 02:19:02,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:19:02,995 INFO L225 Difference]: With dead ends: 1153 [2021-11-23 02:19:02,995 INFO L226 Difference]: Without dead ends: 795 [2021-11-23 02:19:02,999 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 130 SyntacticMatches, 9 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1126 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=277, Invalid=3383, Unknown=0, NotChecked=0, Total=3660 [2021-11-23 02:19:03,000 INFO L933 BasicCegarLoop]: 287 mSDtfsCounter, 269 mSDsluCounter, 1952 mSDsCounter, 0 mSdLazyCounter, 401 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 288 SdHoareTripleChecker+Valid, 2131 SdHoareTripleChecker+Invalid, 437 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 401 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:19:03,000 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [288 Valid, 2131 Invalid, 437 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 401 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:19:03,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 795 states. [2021-11-23 02:19:03,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 795 to 496. [2021-11-23 02:19:03,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 496 states, 369 states have (on average 1.3712737127371273) internal successors, (506), 372 states have internal predecessors, (506), 84 states have call successors, (84), 42 states have call predecessors, (84), 42 states have return successors, (84), 81 states have call predecessors, (84), 84 states have call successors, (84) [2021-11-23 02:19:03,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 496 states to 496 states and 674 transitions. [2021-11-23 02:19:03,064 INFO L78 Accepts]: Start accepts. Automaton has 496 states and 674 transitions. Word has length 62 [2021-11-23 02:19:03,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:19:03,065 INFO L470 AbstractCegarLoop]: Abstraction has 496 states and 674 transitions. [2021-11-23 02:19:03,065 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 02:19:03,066 INFO L276 IsEmpty]: Start isEmpty. Operand 496 states and 674 transitions. [2021-11-23 02:19:03,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 02:19:03,067 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:19:03,067 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 02:19:03,105 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-23 02:19:03,293 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-23 02:19:03,293 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:19:03,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:19:03,294 INFO L85 PathProgramCache]: Analyzing trace with hash 372001254, now seen corresponding path program 1 times [2021-11-23 02:19:03,294 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:19:03,294 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1601683876] [2021-11-23 02:19:03,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:03,294 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:19:03,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:03,345 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 02:19:03,346 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:19:03,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1601683876] [2021-11-23 02:19:03,346 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1601683876] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:19:03,346 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:19:03,346 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:19:03,347 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048432833] [2021-11-23 02:19:03,347 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:19:03,347 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:19:03,347 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:19:03,348 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:19:03,348 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:19:03,349 INFO L87 Difference]: Start difference. First operand 496 states and 674 transitions. Second operand has 4 states, 4 states have (on average 11.75) internal successors, (47), 3 states have internal predecessors, (47), 2 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-23 02:19:03,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:19:03,460 INFO L93 Difference]: Finished difference Result 905 states and 1235 transitions. [2021-11-23 02:19:03,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:19:03,461 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 02:19:03,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:19:03,466 INFO L225 Difference]: With dead ends: 905 [2021-11-23 02:19:03,466 INFO L226 Difference]: Without dead ends: 508 [2021-11-23 02:19:03,467 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 02:19:03,468 INFO L933 BasicCegarLoop]: 215 mSDtfsCounter, 5 mSDsluCounter, 437 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 630 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:19:03,469 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 630 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:19:03,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 508 states. [2021-11-23 02:19:03,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 508 to 508. [2021-11-23 02:19:03,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 508 states, 378 states have (on average 1.3624338624338623) internal successors, (515), 381 states have internal predecessors, (515), 84 states have call successors, (84), 45 states have call predecessors, (84), 45 states have return successors, (84), 81 states have call predecessors, (84), 84 states have call successors, (84) [2021-11-23 02:19:03,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 508 states to 508 states and 683 transitions. [2021-11-23 02:19:03,527 INFO L78 Accepts]: Start accepts. Automaton has 508 states and 683 transitions. Word has length 66 [2021-11-23 02:19:03,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:19:03,528 INFO L470 AbstractCegarLoop]: Abstraction has 508 states and 683 transitions. [2021-11-23 02:19:03,528 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 02:19:03,528 INFO L276 IsEmpty]: Start isEmpty. Operand 508 states and 683 transitions. [2021-11-23 02:19:03,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 02:19:03,530 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:19:03,530 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 02:19:03,530 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-23 02:19:03,531 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:19:03,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:19:03,531 INFO L85 PathProgramCache]: Analyzing trace with hash 1950784243, now seen corresponding path program 1 times [2021-11-23 02:19:03,531 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:19:03,532 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [559619812] [2021-11-23 02:19:03,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:03,532 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:19:03,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:03,644 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 02:19:03,645 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:19:03,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [559619812] [2021-11-23 02:19:03,645 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [559619812] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:19:03,645 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:19:03,645 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:19:03,648 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548822316] [2021-11-23 02:19:03,648 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:19:03,649 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:19:03,649 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:19:03,649 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:19:03,650 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:19:03,650 INFO L87 Difference]: Start difference. First operand 508 states and 683 transitions. Second operand has 6 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-23 02:19:03,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:19:03,855 INFO L93 Difference]: Finished difference Result 640 states and 893 transitions. [2021-11-23 02:19:03,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:19:03,856 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 02:19:03,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:19:03,862 INFO L225 Difference]: With dead ends: 640 [2021-11-23 02:19:03,862 INFO L226 Difference]: Without dead ends: 638 [2021-11-23 02:19:03,863 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 02:19:03,864 INFO L933 BasicCegarLoop]: 382 mSDtfsCounter, 171 mSDsluCounter, 1374 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 193 SdHoareTripleChecker+Valid, 1698 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:19:03,865 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [193 Valid, 1698 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:19:03,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 638 states. [2021-11-23 02:19:03,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 638 to 512. [2021-11-23 02:19:03,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 512 states, 380 states have (on average 1.3605263157894736) internal successors, (517), 384 states have internal predecessors, (517), 85 states have call successors, (85), 46 states have call predecessors, (85), 46 states have return successors, (85), 81 states have call predecessors, (85), 85 states have call successors, (85) [2021-11-23 02:19:03,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 512 states to 512 states and 687 transitions. [2021-11-23 02:19:03,932 INFO L78 Accepts]: Start accepts. Automaton has 512 states and 687 transitions. Word has length 65 [2021-11-23 02:19:03,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:19:03,933 INFO L470 AbstractCegarLoop]: Abstraction has 512 states and 687 transitions. [2021-11-23 02:19:03,933 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 02:19:03,933 INFO L276 IsEmpty]: Start isEmpty. Operand 512 states and 687 transitions. [2021-11-23 02:19:03,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 02:19:03,940 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:19:03,940 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 02:19:03,941 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-23 02:19:03,941 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:19:03,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:19:03,942 INFO L85 PathProgramCache]: Analyzing trace with hash 1894530078, now seen corresponding path program 1 times [2021-11-23 02:19:03,942 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:19:03,942 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1175845026] [2021-11-23 02:19:03,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:03,942 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:19:03,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:04,022 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 02:19:04,022 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:19:04,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1175845026] [2021-11-23 02:19:04,022 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1175845026] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:19:04,023 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:19:04,023 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:19:04,023 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1758700060] [2021-11-23 02:19:04,023 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:19:04,024 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:19:04,024 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:19:04,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:19:04,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:19:04,025 INFO L87 Difference]: Start difference. First operand 512 states and 687 transitions. Second operand has 4 states, 4 states have (on average 11.25) internal successors, (45), 3 states have internal predecessors, (45), 2 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-23 02:19:04,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:19:04,118 INFO L93 Difference]: Finished difference Result 831 states and 1118 transitions. [2021-11-23 02:19:04,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:19:04,119 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 02:19:04,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:19:04,124 INFO L225 Difference]: With dead ends: 831 [2021-11-23 02:19:04,124 INFO L226 Difference]: Without dead ends: 506 [2021-11-23 02:19:04,125 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 02:19:04,126 INFO L933 BasicCegarLoop]: 210 mSDtfsCounter, 7 mSDsluCounter, 434 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 622 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:19:04,126 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 622 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:19:04,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 506 states. [2021-11-23 02:19:04,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 506 to 506. [2021-11-23 02:19:04,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 506 states, 377 states have (on average 1.339522546419098) internal successors, (505), 381 states have internal predecessors, (505), 82 states have call successors, (82), 46 states have call predecessors, (82), 46 states have return successors, (82), 78 states have call predecessors, (82), 82 states have call successors, (82) [2021-11-23 02:19:04,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 506 states to 506 states and 669 transitions. [2021-11-23 02:19:04,189 INFO L78 Accepts]: Start accepts. Automaton has 506 states and 669 transitions. Word has length 68 [2021-11-23 02:19:04,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:19:04,190 INFO L470 AbstractCegarLoop]: Abstraction has 506 states and 669 transitions. [2021-11-23 02:19:04,190 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 02:19:04,190 INFO L276 IsEmpty]: Start isEmpty. Operand 506 states and 669 transitions. [2021-11-23 02:19:04,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-23 02:19:04,192 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:19:04,192 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 02:19:04,192 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-23 02:19:04,192 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:19:04,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:19:04,193 INFO L85 PathProgramCache]: Analyzing trace with hash 359885845, now seen corresponding path program 1 times [2021-11-23 02:19:04,193 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:19:04,193 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1893984408] [2021-11-23 02:19:04,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:04,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:19:04,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:04,547 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 02:19:04,547 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:19:04,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1893984408] [2021-11-23 02:19:04,548 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1893984408] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:19:04,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1966829184] [2021-11-23 02:19:04,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:04,548 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:19:04,548 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:19:04,553 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:19:04,571 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:19:04,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:04,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 418 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 02:19:04,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:19:05,083 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 02:19:05,083 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:19:05,365 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 02:19:05,365 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1966829184] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:19:05,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1539429872] [2021-11-23 02:19:05,369 INFO L159 IcfgInterpreter]: Started Sifa with 60 locations of interest [2021-11-23 02:19:05,369 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:19:05,369 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:19:05,370 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:19:05,370 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:19:22,505 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 174 for LOIs [2021-11-23 02:19:23,986 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 16 for LOIs [2021-11-23 02:19:23,988 INFO L197 IcfgInterpreter]: Interpreting procedure read_side1_failed_history with input of size 30 for LOIs [2021-11-23 02:19:24,001 INFO L197 IcfgInterpreter]: Interpreting procedure assert with input of size 31 for LOIs [2021-11-23 02:19:24,010 INFO L197 IcfgInterpreter]: Interpreting procedure read_side2_failed_history with input of size 25 for LOIs [2021-11-23 02:19:24,020 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 15 for LOIs [2021-11-23 02:19:24,026 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:19:38,472 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17904#(and (= |assert_#in~arg| 0) (<= ~manual_selection_History_1~0 127) (<= ~active_side_History_1~0 127) (not (= ~active_side_History_0~0 1)) (<= 0 ~active_side_History_0~0) (= assert_~arg |assert_#in~arg|) (<= ~active_side_History_0~0 2) (not (= (mod ~side2Failed_History_1~0 256) 0)) (not (= ~manual_selection_History_1~0 0)) (<= 0 (+ ~manual_selection_History_1~0 128)) (<= 0 (+ ~active_side_History_1~0 128)) (= (mod ~side1Failed_History_1~0 256) 0))' at error location [2021-11-23 02:19:38,472 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:19:38,472 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:19:38,472 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 9, 9] total 20 [2021-11-23 02:19:38,473 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [559086205] [2021-11-23 02:19:38,473 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:19:38,473 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 02:19:38,473 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:19:38,474 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 02:19:38,475 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=301, Invalid=3859, Unknown=0, NotChecked=0, Total=4160 [2021-11-23 02:19:38,476 INFO L87 Difference]: Start difference. First operand 506 states and 669 transitions. Second operand has 20 states, 15 states have (on average 6.0) internal successors, (90), 18 states have internal predecessors, (90), 6 states have call successors, (22), 3 states have call predecessors, (22), 9 states have return successors, (22), 7 states have call predecessors, (22), 6 states have call successors, (22) [2021-11-23 02:19:39,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:19:39,716 INFO L93 Difference]: Finished difference Result 1124 states and 1550 transitions. [2021-11-23 02:19:39,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 02:19:39,717 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 02:19:39,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:19:39,722 INFO L225 Difference]: With dead ends: 1124 [2021-11-23 02:19:39,723 INFO L226 Difference]: Without dead ends: 755 [2021-11-23 02:19:39,726 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 148 SyntacticMatches, 11 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1592 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=352, Invalid=4760, Unknown=0, NotChecked=0, Total=5112 [2021-11-23 02:19:39,727 INFO L933 BasicCegarLoop]: 365 mSDtfsCounter, 564 mSDsluCounter, 4237 mSDsCounter, 0 mSdLazyCounter, 895 mSolverCounterSat, 126 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 599 SdHoareTripleChecker+Valid, 4389 SdHoareTripleChecker+Invalid, 1021 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 126 IncrementalHoareTripleChecker+Valid, 895 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:19:39,727 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [599 Valid, 4389 Invalid, 1021 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [126 Valid, 895 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 02:19:39,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 755 states. [2021-11-23 02:19:39,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 755 to 512. [2021-11-23 02:19:39,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 512 states, 382 states have (on average 1.3350785340314135) internal successors, (510), 387 states have internal predecessors, (510), 80 states have call successors, (80), 49 states have call predecessors, (80), 49 states have return successors, (80), 75 states have call predecessors, (80), 80 states have call successors, (80) [2021-11-23 02:19:39,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 512 states to 512 states and 670 transitions. [2021-11-23 02:19:39,796 INFO L78 Accepts]: Start accepts. Automaton has 512 states and 670 transitions. Word has length 70 [2021-11-23 02:19:39,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:19:39,796 INFO L470 AbstractCegarLoop]: Abstraction has 512 states and 670 transitions. [2021-11-23 02:19:39,796 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 02:19:39,797 INFO L276 IsEmpty]: Start isEmpty. Operand 512 states and 670 transitions. [2021-11-23 02:19:39,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-23 02:19:39,799 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:19:39,799 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 02:19:39,836 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:19:40,025 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-23 02:19:40,025 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:19:40,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:19:40,026 INFO L85 PathProgramCache]: Analyzing trace with hash -992035311, now seen corresponding path program 1 times [2021-11-23 02:19:40,026 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:19:40,026 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [652262517] [2021-11-23 02:19:40,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:40,026 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:19:40,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:40,178 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 02:19:40,178 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:19:40,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [652262517] [2021-11-23 02:19:40,178 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [652262517] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:19:40,179 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:19:40,179 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-23 02:19:40,179 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1940197761] [2021-11-23 02:19:40,179 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:19:40,180 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:19:40,180 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:19:40,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:19:40,180 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:19:40,181 INFO L87 Difference]: Start difference. First operand 512 states and 670 transitions. Second operand has 8 states, 8 states have (on average 6.25) internal successors, (50), 7 states have internal predecessors, (50), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 02:19:40,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:19:40,914 INFO L93 Difference]: Finished difference Result 1210 states and 1663 transitions. [2021-11-23 02:19:40,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:19:40,915 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 02:19:40,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:19:40,922 INFO L225 Difference]: With dead ends: 1210 [2021-11-23 02:19:40,922 INFO L226 Difference]: Without dead ends: 901 [2021-11-23 02:19:40,923 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 02:19:40,924 INFO L933 BasicCegarLoop]: 430 mSDtfsCounter, 705 mSDsluCounter, 1364 mSDsCounter, 0 mSdLazyCounter, 472 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 711 SdHoareTripleChecker+Valid, 1739 SdHoareTripleChecker+Invalid, 595 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 472 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:19:40,924 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [711 Valid, 1739 Invalid, 595 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 472 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:19:40,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 901 states. [2021-11-23 02:19:41,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 901 to 639. [2021-11-23 02:19:41,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 639 states, 474 states have (on average 1.3291139240506329) internal successors, (630), 479 states have internal predecessors, (630), 103 states have call successors, (103), 61 states have call predecessors, (103), 61 states have return successors, (103), 98 states have call predecessors, (103), 103 states have call successors, (103) [2021-11-23 02:19:41,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 639 states to 639 states and 836 transitions. [2021-11-23 02:19:41,011 INFO L78 Accepts]: Start accepts. Automaton has 639 states and 836 transitions. Word has length 71 [2021-11-23 02:19:41,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:19:41,011 INFO L470 AbstractCegarLoop]: Abstraction has 639 states and 836 transitions. [2021-11-23 02:19:41,011 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 02:19:41,012 INFO L276 IsEmpty]: Start isEmpty. Operand 639 states and 836 transitions. [2021-11-23 02:19:41,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-23 02:19:41,014 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:19:41,014 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 02:19:41,014 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-23 02:19:41,014 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:19:41,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:19:41,015 INFO L85 PathProgramCache]: Analyzing trace with hash -2067927662, now seen corresponding path program 1 times [2021-11-23 02:19:41,015 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:19:41,015 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [940396452] [2021-11-23 02:19:41,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:41,016 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:19:41,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:41,066 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 02:19:41,067 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:19:41,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [940396452] [2021-11-23 02:19:41,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [940396452] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:19:41,067 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:19:41,068 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:19:41,068 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1146696901] [2021-11-23 02:19:41,068 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:19:41,069 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:19:41,069 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:19:41,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:19:41,069 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:19:41,071 INFO L87 Difference]: Start difference. First operand 639 states and 836 transitions. Second operand has 4 states, 4 states have (on average 12.25) internal successors, (49), 4 states have internal predecessors, (49), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 02:19:41,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:19:41,332 INFO L93 Difference]: Finished difference Result 1597 states and 2132 transitions. [2021-11-23 02:19:41,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:19:41,333 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 02:19:41,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:19:41,341 INFO L225 Difference]: With dead ends: 1597 [2021-11-23 02:19:41,342 INFO L226 Difference]: Without dead ends: 1156 [2021-11-23 02:19:41,345 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 02:19:41,346 INFO L933 BasicCegarLoop]: 305 mSDtfsCounter, 339 mSDsluCounter, 524 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 339 SdHoareTripleChecker+Valid, 809 SdHoareTripleChecker+Invalid, 154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:19:41,346 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [339 Valid, 809 Invalid, 154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:19:41,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1156 states. [2021-11-23 02:19:41,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1156 to 1038. [2021-11-23 02:19:41,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1038 states, 769 states have (on average 1.319895968790637) internal successors, (1015), 778 states have internal predecessors, (1015), 168 states have call successors, (168), 100 states have call predecessors, (168), 100 states have return successors, (168), 159 states have call predecessors, (168), 168 states have call successors, (168) [2021-11-23 02:19:41,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1038 states to 1038 states and 1351 transitions. [2021-11-23 02:19:41,466 INFO L78 Accepts]: Start accepts. Automaton has 1038 states and 1351 transitions. Word has length 71 [2021-11-23 02:19:41,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:19:41,466 INFO L470 AbstractCegarLoop]: Abstraction has 1038 states and 1351 transitions. [2021-11-23 02:19:41,467 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 02:19:41,467 INFO L276 IsEmpty]: Start isEmpty. Operand 1038 states and 1351 transitions. [2021-11-23 02:19:41,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-23 02:19:41,468 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:19:41,469 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 02:19:41,469 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-23 02:19:41,469 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:19:41,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:19:41,470 INFO L85 PathProgramCache]: Analyzing trace with hash 2033385991, now seen corresponding path program 1 times [2021-11-23 02:19:41,470 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:19:41,470 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1202573510] [2021-11-23 02:19:41,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:41,470 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:19:41,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:41,608 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 02:19:41,608 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:19:41,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1202573510] [2021-11-23 02:19:41,608 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1202573510] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:19:41,608 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:19:41,609 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-23 02:19:41,609 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142412531] [2021-11-23 02:19:41,609 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:19:41,609 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:19:41,610 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:19:41,610 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:19:41,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:19:41,610 INFO L87 Difference]: Start difference. First operand 1038 states and 1351 transitions. Second operand has 8 states, 8 states have (on average 6.5) internal successors, (52), 7 states have internal predecessors, (52), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) [2021-11-23 02:19:42,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:19:42,570 INFO L93 Difference]: Finished difference Result 2933 states and 3981 transitions. [2021-11-23 02:19:42,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:19:42,571 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 02:19:42,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:19:42,586 INFO L225 Difference]: With dead ends: 2933 [2021-11-23 02:19:42,586 INFO L226 Difference]: Without dead ends: 2149 [2021-11-23 02:19:42,589 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 02:19:42,590 INFO L933 BasicCegarLoop]: 442 mSDtfsCounter, 771 mSDsluCounter, 1477 mSDsCounter, 0 mSdLazyCounter, 514 mSolverCounterSat, 189 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 777 SdHoareTripleChecker+Valid, 1829 SdHoareTripleChecker+Invalid, 703 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 189 IncrementalHoareTripleChecker+Valid, 514 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:19:42,590 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [777 Valid, 1829 Invalid, 703 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [189 Valid, 514 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:19:42,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2149 states. [2021-11-23 02:19:42,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2149 to 1453. [2021-11-23 02:19:42,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1453 states, 1068 states have (on average 1.3099250936329587) internal successors, (1399), 1080 states have internal predecessors, (1399), 244 states have call successors, (244), 140 states have call predecessors, (244), 140 states have return successors, (244), 232 states have call predecessors, (244), 244 states have call successors, (244) [2021-11-23 02:19:42,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1453 states to 1453 states and 1887 transitions. [2021-11-23 02:19:42,778 INFO L78 Accepts]: Start accepts. Automaton has 1453 states and 1887 transitions. Word has length 73 [2021-11-23 02:19:42,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:19:42,778 INFO L470 AbstractCegarLoop]: Abstraction has 1453 states and 1887 transitions. [2021-11-23 02:19:42,779 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 02:19:42,779 INFO L276 IsEmpty]: Start isEmpty. Operand 1453 states and 1887 transitions. [2021-11-23 02:19:42,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-23 02:19:42,781 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:19:42,781 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 02:19:42,781 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-23 02:19:42,782 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:19:42,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:19:42,782 INFO L85 PathProgramCache]: Analyzing trace with hash 972839730, now seen corresponding path program 1 times [2021-11-23 02:19:42,782 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:19:42,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [396077375] [2021-11-23 02:19:42,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:42,783 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:19:42,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:42,839 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 02:19:42,839 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:19:42,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [396077375] [2021-11-23 02:19:42,839 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [396077375] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:19:42,839 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:19:42,840 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:19:42,841 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907499028] [2021-11-23 02:19:42,841 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:19:42,842 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:19:42,842 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:19:42,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:19:42,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:19:42,843 INFO L87 Difference]: Start difference. First operand 1453 states and 1887 transitions. Second operand has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 02:19:43,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:19:43,265 INFO L93 Difference]: Finished difference Result 3505 states and 4617 transitions. [2021-11-23 02:19:43,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:19:43,266 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 02:19:43,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:19:43,286 INFO L225 Difference]: With dead ends: 3505 [2021-11-23 02:19:43,286 INFO L226 Difference]: Without dead ends: 2442 [2021-11-23 02:19:43,290 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 02:19:43,291 INFO L933 BasicCegarLoop]: 331 mSDtfsCounter, 364 mSDsluCounter, 565 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 364 SdHoareTripleChecker+Valid, 873 SdHoareTripleChecker+Invalid, 146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:19:43,292 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [364 Valid, 873 Invalid, 146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:19:43,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2442 states. [2021-11-23 02:19:43,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2442 to 2157. [2021-11-23 02:19:43,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2157 states, 1582 states have (on average 1.3008849557522124) internal successors, (2058), 1599 states have internal predecessors, (2058), 367 states have call successors, (367), 207 states have call predecessors, (367), 207 states have return successors, (367), 350 states have call predecessors, (367), 367 states have call successors, (367) [2021-11-23 02:19:43,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2157 states to 2157 states and 2792 transitions. [2021-11-23 02:19:43,620 INFO L78 Accepts]: Start accepts. Automaton has 2157 states and 2792 transitions. Word has length 75 [2021-11-23 02:19:43,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:19:43,621 INFO L470 AbstractCegarLoop]: Abstraction has 2157 states and 2792 transitions. [2021-11-23 02:19:43,621 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 02:19:43,621 INFO L276 IsEmpty]: Start isEmpty. Operand 2157 states and 2792 transitions. [2021-11-23 02:19:43,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-23 02:19:43,626 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:19:43,627 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 02:19:43,627 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-23 02:19:43,627 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:19:43,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:19:43,628 INFO L85 PathProgramCache]: Analyzing trace with hash -1045851784, now seen corresponding path program 1 times [2021-11-23 02:19:43,628 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:19:43,628 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1579732139] [2021-11-23 02:19:43,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:43,628 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:19:43,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:43,692 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 02:19:43,692 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:19:43,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1579732139] [2021-11-23 02:19:43,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1579732139] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:19:43,692 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:19:43,693 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:19:43,693 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491285712] [2021-11-23 02:19:43,693 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:19:43,693 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:19:43,694 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:19:43,694 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:19:43,694 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:19:43,695 INFO L87 Difference]: Start difference. First operand 2157 states and 2792 transitions. Second operand has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 02:19:44,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:19:44,116 INFO L93 Difference]: Finished difference Result 4748 states and 6213 transitions. [2021-11-23 02:19:44,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:19:44,116 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 02:19:44,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:19:44,139 INFO L225 Difference]: With dead ends: 4748 [2021-11-23 02:19:44,140 INFO L226 Difference]: Without dead ends: 3152 [2021-11-23 02:19:44,148 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 02:19:44,149 INFO L933 BasicCegarLoop]: 394 mSDtfsCounter, 340 mSDsluCounter, 567 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 340 SdHoareTripleChecker+Valid, 941 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:19:44,149 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [340 Valid, 941 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:19:44,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3152 states. [2021-11-23 02:19:44,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3152 to 2896. [2021-11-23 02:19:44,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2896 states, 2122 states have (on average 1.295947219604147) internal successors, (2750), 2145 states have internal predecessors, (2750), 496 states have call successors, (496), 277 states have call predecessors, (496), 277 states have return successors, (496), 473 states have call predecessors, (496), 496 states have call successors, (496) [2021-11-23 02:19:44,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2896 states to 2896 states and 3742 transitions. [2021-11-23 02:19:44,537 INFO L78 Accepts]: Start accepts. Automaton has 2896 states and 3742 transitions. Word has length 75 [2021-11-23 02:19:44,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:19:44,537 INFO L470 AbstractCegarLoop]: Abstraction has 2896 states and 3742 transitions. [2021-11-23 02:19:44,538 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 02:19:44,538 INFO L276 IsEmpty]: Start isEmpty. Operand 2896 states and 3742 transitions. [2021-11-23 02:19:44,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-23 02:19:44,541 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:19:44,541 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 02:19:44,542 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-23 02:19:44,542 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:19:44,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:19:44,543 INFO L85 PathProgramCache]: Analyzing trace with hash -829001926, now seen corresponding path program 1 times [2021-11-23 02:19:44,543 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:19:44,543 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1584479245] [2021-11-23 02:19:44,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:44,543 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:19:44,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:44,621 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 02:19:44,622 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:19:44,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1584479245] [2021-11-23 02:19:44,622 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1584479245] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:19:44,622 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:19:44,622 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:19:44,623 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517430202] [2021-11-23 02:19:44,623 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:19:44,624 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:19:44,624 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:19:44,624 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:19:44,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:19:44,625 INFO L87 Difference]: Start difference. First operand 2896 states and 3742 transitions. Second operand has 4 states, 4 states have (on average 12.25) internal successors, (49), 3 states have internal predecessors, (49), 2 states have call successors, (10), 3 states have call predecessors, (10), 1 states have return successors, (8), 1 states have call predecessors, (8), 1 states have call successors, (8) [2021-11-23 02:19:44,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:19:44,904 INFO L93 Difference]: Finished difference Result 5075 states and 6603 transitions. [2021-11-23 02:19:44,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:19:44,904 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 02:19:44,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:19:44,925 INFO L225 Difference]: With dead ends: 5075 [2021-11-23 02:19:44,925 INFO L226 Difference]: Without dead ends: 2856 [2021-11-23 02:19:44,932 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 02:19:44,933 INFO L933 BasicCegarLoop]: 206 mSDtfsCounter, 7 mSDsluCounter, 420 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 604 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:19:44,933 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 604 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:19:44,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2856 states. [2021-11-23 02:19:45,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2856 to 2856. [2021-11-23 02:19:45,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2856 states, 2102 states have (on average 1.2702188392007612) internal successors, (2670), 2125 states have internal predecessors, (2670), 476 states have call successors, (476), 277 states have call predecessors, (476), 277 states have return successors, (476), 453 states have call predecessors, (476), 476 states have call successors, (476) [2021-11-23 02:19:45,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2856 states to 2856 states and 3622 transitions. [2021-11-23 02:19:45,270 INFO L78 Accepts]: Start accepts. Automaton has 2856 states and 3622 transitions. Word has length 77 [2021-11-23 02:19:45,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:19:45,270 INFO L470 AbstractCegarLoop]: Abstraction has 2856 states and 3622 transitions. [2021-11-23 02:19:45,271 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 02:19:45,271 INFO L276 IsEmpty]: Start isEmpty. Operand 2856 states and 3622 transitions. [2021-11-23 02:19:45,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-23 02:19:45,274 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:19:45,275 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 02:19:45,275 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-11-23 02:19:45,275 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:19:45,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:19:45,276 INFO L85 PathProgramCache]: Analyzing trace with hash -1645706650, now seen corresponding path program 1 times [2021-11-23 02:19:45,276 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:19:45,276 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [208116958] [2021-11-23 02:19:45,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:45,276 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:19:45,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:45,310 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 02:19:45,310 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:19:45,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [208116958] [2021-11-23 02:19:45,311 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [208116958] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:19:45,311 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:19:45,311 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:19:45,311 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153055670] [2021-11-23 02:19:45,311 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:19:45,312 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:19:45,312 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:19:45,312 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:19:45,313 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:19:45,313 INFO L87 Difference]: Start difference. First operand 2856 states and 3622 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 02:19:45,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:19:45,793 INFO L93 Difference]: Finished difference Result 6143 states and 8117 transitions. [2021-11-23 02:19:45,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:19:45,793 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 02:19:45,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:19:45,818 INFO L225 Difference]: With dead ends: 6143 [2021-11-23 02:19:45,818 INFO L226 Difference]: Without dead ends: 3784 [2021-11-23 02:19:45,826 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:19:45,826 INFO L933 BasicCegarLoop]: 344 mSDtfsCounter, 111 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 527 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:19:45,827 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 527 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:19:45,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3784 states. [2021-11-23 02:19:46,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3784 to 2861. [2021-11-23 02:19:46,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2861 states, 2107 states have (on average 1.269577598481253) internal successors, (2675), 2130 states have internal predecessors, (2675), 476 states have call successors, (476), 277 states have call predecessors, (476), 277 states have return successors, (476), 453 states have call predecessors, (476), 476 states have call successors, (476) [2021-11-23 02:19:46,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2861 states to 2861 states and 3627 transitions. [2021-11-23 02:19:46,225 INFO L78 Accepts]: Start accepts. Automaton has 2861 states and 3627 transitions. Word has length 76 [2021-11-23 02:19:46,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:19:46,225 INFO L470 AbstractCegarLoop]: Abstraction has 2861 states and 3627 transitions. [2021-11-23 02:19:46,226 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 02:19:46,226 INFO L276 IsEmpty]: Start isEmpty. Operand 2861 states and 3627 transitions. [2021-11-23 02:19:46,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-23 02:19:46,230 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:19:46,230 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 02:19:46,230 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-11-23 02:19:46,231 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:19:46,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:19:46,231 INFO L85 PathProgramCache]: Analyzing trace with hash 2093816179, now seen corresponding path program 1 times [2021-11-23 02:19:46,231 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:19:46,232 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [138020859] [2021-11-23 02:19:46,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:46,232 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:19:46,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:46,292 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 02:19:46,293 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:19:46,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [138020859] [2021-11-23 02:19:46,293 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [138020859] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:19:46,293 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:19:46,294 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:19:46,294 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651636055] [2021-11-23 02:19:46,294 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:19:46,294 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:19:46,295 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:19:46,295 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:19:46,295 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:19:46,296 INFO L87 Difference]: Start difference. First operand 2861 states and 3627 transitions. Second operand has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 02:19:46,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:19:46,652 INFO L93 Difference]: Finished difference Result 5323 states and 6851 transitions. [2021-11-23 02:19:46,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:19:46,652 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 02:19:46,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:19:46,670 INFO L225 Difference]: With dead ends: 5323 [2021-11-23 02:19:46,670 INFO L226 Difference]: Without dead ends: 2591 [2021-11-23 02:19:46,677 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 02:19:46,678 INFO L933 BasicCegarLoop]: 236 mSDtfsCounter, 212 mSDsluCounter, 424 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 237 SdHoareTripleChecker+Valid, 644 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:19:46,678 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [237 Valid, 644 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:19:46,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2591 states. [2021-11-23 02:19:46,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2591 to 2336. [2021-11-23 02:19:46,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2336 states, 1719 states have (on average 1.2739965095986039) internal successors, (2190), 1738 states have internal predecessors, (2190), 389 states have call successors, (389), 227 states have call predecessors, (389), 227 states have return successors, (389), 370 states have call predecessors, (389), 389 states have call successors, (389) [2021-11-23 02:19:46,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2336 states to 2336 states and 2968 transitions. [2021-11-23 02:19:46,962 INFO L78 Accepts]: Start accepts. Automaton has 2336 states and 2968 transitions. Word has length 77 [2021-11-23 02:19:46,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:19:46,962 INFO L470 AbstractCegarLoop]: Abstraction has 2336 states and 2968 transitions. [2021-11-23 02:19:46,962 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 02:19:46,963 INFO L276 IsEmpty]: Start isEmpty. Operand 2336 states and 2968 transitions. [2021-11-23 02:19:46,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-23 02:19:46,965 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:19:46,965 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 02:19:46,965 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-11-23 02:19:46,966 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:19:46,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:19:46,966 INFO L85 PathProgramCache]: Analyzing trace with hash -1771659663, now seen corresponding path program 1 times [2021-11-23 02:19:46,966 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:19:46,966 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [634076622] [2021-11-23 02:19:46,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:46,967 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:19:46,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:46,998 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 02:19:46,998 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:19:46,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [634076622] [2021-11-23 02:19:46,998 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [634076622] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:19:46,998 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:19:46,999 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:19:46,999 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29117565] [2021-11-23 02:19:46,999 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:19:46,999 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:19:46,999 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:19:47,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:19:47,000 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:19:47,000 INFO L87 Difference]: Start difference. First operand 2336 states and 2968 transitions. Second operand has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 02:19:47,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:19:47,356 INFO L93 Difference]: Finished difference Result 4910 states and 6449 transitions. [2021-11-23 02:19:47,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:19:47,357 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 02:19:47,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:19:47,375 INFO L225 Difference]: With dead ends: 4910 [2021-11-23 02:19:47,375 INFO L226 Difference]: Without dead ends: 2886 [2021-11-23 02:19:47,380 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:19:47,381 INFO L933 BasicCegarLoop]: 324 mSDtfsCounter, 111 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 504 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 02:19:47,381 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 504 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:19:47,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2886 states. [2021-11-23 02:19:47,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2886 to 2341. [2021-11-23 02:19:47,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2341 states, 1724 states have (on average 1.273201856148492) internal successors, (2195), 1743 states have internal predecessors, (2195), 389 states have call successors, (389), 227 states have call predecessors, (389), 227 states have return successors, (389), 370 states have call predecessors, (389), 389 states have call successors, (389) [2021-11-23 02:19:47,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2341 states to 2341 states and 2973 transitions. [2021-11-23 02:19:47,674 INFO L78 Accepts]: Start accepts. Automaton has 2341 states and 2973 transitions. Word has length 78 [2021-11-23 02:19:47,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:19:47,674 INFO L470 AbstractCegarLoop]: Abstraction has 2341 states and 2973 transitions. [2021-11-23 02:19:47,675 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 02:19:47,676 INFO L276 IsEmpty]: Start isEmpty. Operand 2341 states and 2973 transitions. [2021-11-23 02:19:47,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-23 02:19:47,678 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:19:47,678 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 02:19:47,678 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-11-23 02:19:47,678 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:19:47,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:19:47,679 INFO L85 PathProgramCache]: Analyzing trace with hash -1115837418, now seen corresponding path program 1 times [2021-11-23 02:19:47,679 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:19:47,679 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [715374294] [2021-11-23 02:19:47,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:47,680 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:19:47,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:47,743 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 02:19:47,743 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:19:47,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [715374294] [2021-11-23 02:19:47,743 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [715374294] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:19:47,744 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:19:47,744 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:19:47,744 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [410469257] [2021-11-23 02:19:47,744 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:19:47,745 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:19:47,745 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:19:47,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:19:47,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:19:47,746 INFO L87 Difference]: Start difference. First operand 2341 states and 2973 transitions. Second operand has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 02:19:48,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:19:48,178 INFO L93 Difference]: Finished difference Result 4668 states and 6073 transitions. [2021-11-23 02:19:48,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:19:48,178 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 02:19:48,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:19:48,197 INFO L225 Difference]: With dead ends: 4668 [2021-11-23 02:19:48,198 INFO L226 Difference]: Without dead ends: 2587 [2021-11-23 02:19:48,202 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 02:19:48,202 INFO L933 BasicCegarLoop]: 233 mSDtfsCounter, 169 mSDsluCounter, 427 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 194 SdHoareTripleChecker+Valid, 642 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:19:48,207 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [194 Valid, 642 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:19:48,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2587 states. [2021-11-23 02:19:48,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2587 to 2156. [2021-11-23 02:19:48,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2156 states, 1583 states have (on average 1.268477574226153) internal successors, (2008), 1598 states have internal predecessors, (2008), 361 states have call successors, (361), 211 states have call predecessors, (361), 211 states have return successors, (361), 346 states have call predecessors, (361), 361 states have call successors, (361) [2021-11-23 02:19:48,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2156 states to 2156 states and 2730 transitions. [2021-11-23 02:19:48,470 INFO L78 Accepts]: Start accepts. Automaton has 2156 states and 2730 transitions. Word has length 78 [2021-11-23 02:19:48,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:19:48,471 INFO L470 AbstractCegarLoop]: Abstraction has 2156 states and 2730 transitions. [2021-11-23 02:19:48,471 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 02:19:48,471 INFO L276 IsEmpty]: Start isEmpty. Operand 2156 states and 2730 transitions. [2021-11-23 02:19:48,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-23 02:19:48,474 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:19:48,474 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 02:19:48,475 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-11-23 02:19:48,475 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:19:48,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:19:48,476 INFO L85 PathProgramCache]: Analyzing trace with hash 632192982, now seen corresponding path program 1 times [2021-11-23 02:19:48,476 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:19:48,476 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [482735498] [2021-11-23 02:19:48,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:48,477 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:19:48,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:48,544 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 02:19:48,545 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:19:48,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [482735498] [2021-11-23 02:19:48,545 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [482735498] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:19:48,545 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:19:48,545 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:19:48,546 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769202114] [2021-11-23 02:19:48,546 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:19:48,546 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:19:48,546 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:19:48,547 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:19:48,547 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:19:48,548 INFO L87 Difference]: Start difference. First operand 2156 states and 2730 transitions. Second operand has 4 states, 4 states have (on average 13.5) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (12), 3 states have call predecessors, (12), 1 states have return successors, (10), 1 states have call predecessors, (10), 1 states have call successors, (10) [2021-11-23 02:19:48,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:19:48,830 INFO L93 Difference]: Finished difference Result 3998 states and 5096 transitions. [2021-11-23 02:19:48,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:19:48,831 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 02:19:48,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:19:48,839 INFO L225 Difference]: With dead ends: 3998 [2021-11-23 02:19:48,839 INFO L226 Difference]: Without dead ends: 2126 [2021-11-23 02:19:48,844 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 02:19:48,844 INFO L933 BasicCegarLoop]: 202 mSDtfsCounter, 7 mSDsluCounter, 412 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 592 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:19:48,846 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 592 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:19:48,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2126 states. [2021-11-23 02:19:49,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2126 to 2051. [2021-11-23 02:19:49,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2051 states, 1514 states have (on average 1.239101717305152) internal successors, (1876), 1529 states have internal predecessors, (1876), 334 states have call successors, (334), 202 states have call predecessors, (334), 202 states have return successors, (334), 319 states have call predecessors, (334), 334 states have call successors, (334) [2021-11-23 02:19:49,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2051 states to 2051 states and 2544 transitions. [2021-11-23 02:19:49,144 INFO L78 Accepts]: Start accepts. Automaton has 2051 states and 2544 transitions. Word has length 93 [2021-11-23 02:19:49,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:19:49,145 INFO L470 AbstractCegarLoop]: Abstraction has 2051 states and 2544 transitions. [2021-11-23 02:19:49,145 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 02:19:49,145 INFO L276 IsEmpty]: Start isEmpty. Operand 2051 states and 2544 transitions. [2021-11-23 02:19:49,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-23 02:19:49,149 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:19:49,149 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 02:19:49,149 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-11-23 02:19:49,151 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:19:49,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:19:49,151 INFO L85 PathProgramCache]: Analyzing trace with hash 1457482290, now seen corresponding path program 1 times [2021-11-23 02:19:49,152 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:19:49,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1559554515] [2021-11-23 02:19:49,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:49,152 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:19:49,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:49,225 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 02:19:49,225 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:19:49,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1559554515] [2021-11-23 02:19:49,226 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1559554515] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:19:49,226 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:19:49,226 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:19:49,226 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [798334001] [2021-11-23 02:19:49,226 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:19:49,227 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:19:49,227 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:19:49,227 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:19:49,228 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:19:49,228 INFO L87 Difference]: Start difference. First operand 2051 states and 2544 transitions. Second operand has 4 states, 4 states have (on average 15.75) internal successors, (63), 3 states have internal predecessors, (63), 2 states have call successors, (14), 3 states have call predecessors, (14), 1 states have return successors, (12), 1 states have call predecessors, (12), 1 states have call successors, (12) [2021-11-23 02:19:49,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:19:49,496 INFO L93 Difference]: Finished difference Result 3755 states and 4691 transitions. [2021-11-23 02:19:49,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:19:49,497 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 02:19:49,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:19:49,505 INFO L225 Difference]: With dead ends: 3755 [2021-11-23 02:19:49,505 INFO L226 Difference]: Without dead ends: 2015 [2021-11-23 02:19:49,510 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 02:19:49,510 INFO L933 BasicCegarLoop]: 199 mSDtfsCounter, 6 mSDsluCounter, 406 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 583 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:19:49,511 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 583 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:19:49,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2015 states. [2021-11-23 02:19:49,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2015 to 1921. [2021-11-23 02:19:49,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1921 states, 1418 states have (on average 1.2136812411847673) internal successors, (1721), 1433 states have internal predecessors, (1721), 311 states have call successors, (311), 191 states have call predecessors, (311), 191 states have return successors, (311), 296 states have call predecessors, (311), 311 states have call successors, (311) [2021-11-23 02:19:49,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1921 states to 1921 states and 2343 transitions. [2021-11-23 02:19:49,748 INFO L78 Accepts]: Start accepts. Automaton has 1921 states and 2343 transitions. Word has length 109 [2021-11-23 02:19:49,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:19:49,749 INFO L470 AbstractCegarLoop]: Abstraction has 1921 states and 2343 transitions. [2021-11-23 02:19:49,749 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 02:19:49,749 INFO L276 IsEmpty]: Start isEmpty. Operand 1921 states and 2343 transitions. [2021-11-23 02:19:49,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-11-23 02:19:49,754 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:19:49,754 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 02:19:49,754 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-11-23 02:19:49,755 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:19:49,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:19:49,755 INFO L85 PathProgramCache]: Analyzing trace with hash -1809589583, now seen corresponding path program 1 times [2021-11-23 02:19:49,755 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:19:49,755 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [678708680] [2021-11-23 02:19:49,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:49,756 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:19:49,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:49,925 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 02:19:49,925 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:19:49,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [678708680] [2021-11-23 02:19:49,926 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [678708680] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:19:49,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1697623694] [2021-11-23 02:19:49,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:49,926 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:19:49,926 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:19:49,927 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:19:49,947 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:19:50,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:50,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 529 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 02:19:50,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:19:50,280 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 02:19:50,280 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:19:50,281 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1697623694] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:19:50,281 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:19:50,281 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [8] total 11 [2021-11-23 02:19:50,281 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1517226981] [2021-11-23 02:19:50,281 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:19:50,282 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 02:19:50,282 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:19:50,282 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 02:19:50,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:19:50,283 INFO L87 Difference]: Start difference. First operand 1921 states and 2343 transitions. Second operand has 9 states, 9 states have (on average 8.666666666666666) internal successors, (78), 7 states have internal predecessors, (78), 3 states have call successors, (15), 3 states have call predecessors, (15), 4 states have return successors, (14), 4 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-23 02:19:51,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:19:51,152 INFO L93 Difference]: Finished difference Result 5030 states and 6200 transitions. [2021-11-23 02:19:51,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 02:19:51,153 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 02:19:51,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:19:51,165 INFO L225 Difference]: With dead ends: 5030 [2021-11-23 02:19:51,165 INFO L226 Difference]: Without dead ends: 3276 [2021-11-23 02:19:51,170 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 02:19:51,170 INFO L933 BasicCegarLoop]: 231 mSDtfsCounter, 261 mSDsluCounter, 1231 mSDsCounter, 0 mSdLazyCounter, 380 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 277 SdHoareTripleChecker+Valid, 1376 SdHoareTripleChecker+Invalid, 448 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 380 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:19:51,171 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [277 Valid, 1376 Invalid, 448 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 380 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:19:51,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3276 states. [2021-11-23 02:19:51,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3276 to 2148. [2021-11-23 02:19:51,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2148 states, 1584 states have (on average 1.2039141414141414) internal successors, (1907), 1603 states have internal predecessors, (1907), 343 states have call successors, (343), 220 states have call predecessors, (343), 220 states have return successors, (343), 324 states have call predecessors, (343), 343 states have call successors, (343) [2021-11-23 02:19:51,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2148 states to 2148 states and 2593 transitions. [2021-11-23 02:19:51,455 INFO L78 Accepts]: Start accepts. Automaton has 2148 states and 2593 transitions. Word has length 119 [2021-11-23 02:19:51,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:19:51,455 INFO L470 AbstractCegarLoop]: Abstraction has 2148 states and 2593 transitions. [2021-11-23 02:19:51,456 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 02:19:51,456 INFO L276 IsEmpty]: Start isEmpty. Operand 2148 states and 2593 transitions. [2021-11-23 02:19:51,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-23 02:19:51,460 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:19:51,461 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 02:19:51,500 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:19:51,689 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-23 02:19:51,689 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:19:51,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:19:51,690 INFO L85 PathProgramCache]: Analyzing trace with hash 1336879329, now seen corresponding path program 1 times [2021-11-23 02:19:51,690 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:19:51,690 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [735708036] [2021-11-23 02:19:51,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:51,690 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:19:51,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:52,229 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 02:19:52,229 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:19:52,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [735708036] [2021-11-23 02:19:52,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [735708036] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:19:52,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1220953509] [2021-11-23 02:19:52,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:52,229 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:19:52,230 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:19:52,231 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:19:52,249 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:19:52,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:52,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 548 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 02:19:52,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:19:52,902 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 02:19:52,902 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:19:53,237 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 02:19:53,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1220953509] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:19:53,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [978491952] [2021-11-23 02:19:53,241 INFO L159 IcfgInterpreter]: Started Sifa with 83 locations of interest [2021-11-23 02:19:53,241 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:19:53,242 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:19:53,242 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:19:53,242 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:20:10,217 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 162 for LOIs [2021-11-23 02:20:13,291 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 12 for LOIs [2021-11-23 02:20:13,293 INFO L197 IcfgInterpreter]: Interpreting procedure read_side1_failed_history with input of size 22 for LOIs [2021-11-23 02:20:13,331 INFO L197 IcfgInterpreter]: Interpreting procedure assert with input of size 31 for LOIs [2021-11-23 02:20:13,340 INFO L197 IcfgInterpreter]: Interpreting procedure read_side2_failed_history with input of size 22 for LOIs [2021-11-23 02:20:13,358 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 35 for LOIs [2021-11-23 02:20:13,391 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:20:33,601 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '125756#(and (= (mod ~side2Failed_History_1~0 256) (mod ~side2Failed_History_2~0 256)) (= |assert_#in~arg| 0) (<= ~manual_selection_History_1~0 127) (<= 0 ~active_side_History_0~0) (= assert_~arg |assert_#in~arg|) (= (mod ~side2Failed_History_1~0 256) 0) (= (mod ~side1Failed_History_2~0 256) (mod ~side1Failed_History_1~0 256)) (<= ~active_side_History_0~0 2) (= ~manual_selection_History_2~0 0) (not (= ~manual_selection_History_1~0 0)) (<= 0 (+ ~manual_selection_History_1~0 128)) (= (mod ~side1Failed_History_1~0 256) 0))' at error location [2021-11-23 02:20:33,605 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:20:33,605 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:20:33,605 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 9, 9] total 27 [2021-11-23 02:20:33,606 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367090142] [2021-11-23 02:20:33,606 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:20:33,608 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-23 02:20:33,608 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:20:33,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-23 02:20:33,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=7522, Unknown=0, NotChecked=0, Total=8190 [2021-11-23 02:20:33,612 INFO L87 Difference]: Start difference. First operand 2148 states and 2593 transitions. Second operand has 27 states, 21 states have (on average 6.238095238095238) internal successors, (131), 23 states have internal predecessors, (131), 8 states have call successors, (38), 3 states have call predecessors, (38), 10 states have return successors, (37), 10 states have call predecessors, (37), 8 states have call successors, (37) [2021-11-23 02:20:36,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:20:36,354 INFO L93 Difference]: Finished difference Result 6034 states and 8040 transitions. [2021-11-23 02:20:36,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 02:20:36,355 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 02:20:36,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:20:36,370 INFO L225 Difference]: With dead ends: 6034 [2021-11-23 02:20:36,370 INFO L226 Difference]: Without dead ends: 4042 [2021-11-23 02:20:36,378 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 407 GetRequests, 295 SyntacticMatches, 13 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3333 ImplicationChecksByTransitivity, 20.9s TimeCoverageRelationStatistics Valid=734, Invalid=9366, Unknown=0, NotChecked=0, Total=10100 [2021-11-23 02:20:36,379 INFO L933 BasicCegarLoop]: 673 mSDtfsCounter, 502 mSDsluCounter, 10220 mSDsCounter, 0 mSdLazyCounter, 1969 mSolverCounterSat, 209 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 552 SdHoareTripleChecker+Valid, 10327 SdHoareTripleChecker+Invalid, 2178 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 209 IncrementalHoareTripleChecker+Valid, 1969 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:20:36,379 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [552 Valid, 10327 Invalid, 2178 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [209 Valid, 1969 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2021-11-23 02:20:36,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4042 states. [2021-11-23 02:20:36,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4042 to 2148. [2021-11-23 02:20:36,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2148 states, 1584 states have (on average 1.2026515151515151) internal successors, (1905), 1603 states have internal predecessors, (1905), 343 states have call successors, (343), 220 states have call predecessors, (343), 220 states have return successors, (343), 324 states have call predecessors, (343), 343 states have call successors, (343) [2021-11-23 02:20:36,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2148 states to 2148 states and 2591 transitions. [2021-11-23 02:20:36,656 INFO L78 Accepts]: Start accepts. Automaton has 2148 states and 2591 transitions. Word has length 127 [2021-11-23 02:20:36,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:20:36,657 INFO L470 AbstractCegarLoop]: Abstraction has 2148 states and 2591 transitions. [2021-11-23 02:20:36,657 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 02:20:36,657 INFO L276 IsEmpty]: Start isEmpty. Operand 2148 states and 2591 transitions. [2021-11-23 02:20:36,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 02:20:36,662 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:20:36,662 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 02:20:36,700 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-11-23 02:20:36,877 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-23 02:20:36,877 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:20:36,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:20:36,878 INFO L85 PathProgramCache]: Analyzing trace with hash 780204592, now seen corresponding path program 1 times [2021-11-23 02:20:36,878 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:20:36,878 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [525568842] [2021-11-23 02:20:36,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:20:36,878 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:20:36,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:20:37,066 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 02:20:37,067 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:20:37,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [525568842] [2021-11-23 02:20:37,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [525568842] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:20:37,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1066006992] [2021-11-23 02:20:37,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:20:37,067 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:20:37,067 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:20:37,070 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:20:37,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:20:37,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:20:37,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 566 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 02:20:37,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:20:37,507 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 02:20:37,507 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:20:37,507 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1066006992] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:20:37,507 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:20:37,507 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [8] total 11 [2021-11-23 02:20:37,507 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128852836] [2021-11-23 02:20:37,508 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:20:37,508 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 02:20:37,508 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:20:37,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 02:20:37,509 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:20:37,509 INFO L87 Difference]: Start difference. First operand 2148 states and 2591 transitions. Second operand has 9 states, 9 states have (on average 9.11111111111111) internal successors, (82), 7 states have internal predecessors, (82), 3 states have call successors, (17), 3 states have call predecessors, (17), 4 states have return successors, (16), 4 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-23 02:20:38,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:20:38,631 INFO L93 Difference]: Finished difference Result 6140 states and 7764 transitions. [2021-11-23 02:20:38,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 02:20:38,632 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 02:20:38,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:20:38,649 INFO L225 Difference]: With dead ends: 6140 [2021-11-23 02:20:38,649 INFO L226 Difference]: Without dead ends: 4142 [2021-11-23 02:20:38,655 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 02:20:38,655 INFO L933 BasicCegarLoop]: 411 mSDtfsCounter, 289 mSDsluCounter, 2088 mSDsCounter, 0 mSdLazyCounter, 505 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 325 SdHoareTripleChecker+Valid, 2412 SdHoareTripleChecker+Invalid, 592 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 505 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:20:38,656 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [325 Valid, 2412 Invalid, 592 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 505 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:20:38,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4142 states. [2021-11-23 02:20:39,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4142 to 2908. [2021-11-23 02:20:39,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2908 states, 2136 states have (on average 1.192883895131086) internal successors, (2548), 2163 states have internal predecessors, (2548), 471 states have call successors, (471), 300 states have call predecessors, (471), 300 states have return successors, (471), 444 states have call predecessors, (471), 471 states have call successors, (471) [2021-11-23 02:20:39,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2908 states to 2908 states and 3490 transitions. [2021-11-23 02:20:39,028 INFO L78 Accepts]: Start accepts. Automaton has 2908 states and 3490 transitions. Word has length 135 [2021-11-23 02:20:39,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:20:39,028 INFO L470 AbstractCegarLoop]: Abstraction has 2908 states and 3490 transitions. [2021-11-23 02:20:39,029 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 02:20:39,029 INFO L276 IsEmpty]: Start isEmpty. Operand 2908 states and 3490 transitions. [2021-11-23 02:20:39,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-11-23 02:20:39,034 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:20:39,034 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 02:20:39,069 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:20:39,257 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:20:39,257 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:20:39,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:20:39,257 INFO L85 PathProgramCache]: Analyzing trace with hash -1205422434, now seen corresponding path program 1 times [2021-11-23 02:20:39,258 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:20:39,258 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [269089953] [2021-11-23 02:20:39,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:20:39,258 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:20:39,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:20:40,936 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 02:20:40,936 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:20:40,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [269089953] [2021-11-23 02:20:40,936 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [269089953] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:20:40,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2003948620] [2021-11-23 02:20:40,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:20:40,937 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:20:40,937 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:20:40,939 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:20:40,939 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 02:20:41,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:20:41,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 583 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 02:20:41,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:20:41,842 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 02:20:41,842 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:20:42,578 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 02:20:42,578 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2003948620] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:20:42,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [108647784] [2021-11-23 02:20:42,581 INFO L159 IcfgInterpreter]: Started Sifa with 89 locations of interest [2021-11-23 02:20:42,581 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:20:42,582 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:20:42,582 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:20:42,583 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:20:50,239 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 74 for LOIs [2021-11-23 02:20:50,341 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 108 for LOIs [2021-11-23 02:20:50,354 INFO L197 IcfgInterpreter]: Interpreting procedure read_side1_failed_history with input of size 104 for LOIs [2021-11-23 02:20:50,503 INFO L197 IcfgInterpreter]: Interpreting procedure assert with input of size 109 for LOIs [2021-11-23 02:20:50,541 INFO L197 IcfgInterpreter]: Interpreting procedure read_side2_failed_history with input of size 112 for LOIs [2021-11-23 02:20:50,655 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 120 for LOIs [2021-11-23 02:20:51,079 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:21:41,282 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '149694#(and (<= ~active_side_History_0~0 0) (<= 0 (+ ~manual_selection_History_0~0 128)) (<= ~s1p~0 0) (<= ~cs2~0 0) (<= 0 |#NULL.base|) (<= 0 (+ ~s1s1_new~0 1)) (<= 0 (+ 2 ~active_side_History_1~0)) (<= 0 (+ ~s2s2_new~0 1)) (<= ~s2s1~0 0) (<= ~s2s2~0 0) (<= 0 (+ ~s2s1_new~0 1)) (<= (+ ~s1p_new~0 1) 0) (<= 0 ~s1s1~0) (= (mod ~side2Failed_History_1~0 256) (mod ~side2Failed_History_2~0 256)) (<= 0 ~cs2~0) (<= ~manual_selection_History_0~0 127) (= ~manual_selection_History_1~0 0) (<= 0 (+ ~s2p_new~0 1)) (= |assert_#in~arg| 0) (<= 0 ~side2_written~0) (<= ~s1s2~0 0) (<= 0 ~s2p~0) (<= ~s2p~0 0) (<= 0 ~cs1~0) (<= 0 ~s1p~0) (<= 0 (+ ~s1s2_new~0 1)) (<= |#NULL.offset| 0) (<= 0 ~active_side_History_0~0) (= assert_~arg |assert_#in~arg|) (<= (+ ~cs2_new~0 1) 0) (<= (+ ~s1s2_new~0 1) 0) (<= 0 (+ ~s1p_new~0 1)) (<= (+ 2 ~active_side_History_2~0) 0) (<= (+ ~s2s1_new~0 1) 0) (= (mod ~side2Failed_History_1~0 256) 0) (= ~manual_selection_History_2~0 0) (<= ~cs1~0 0) (<= 0 ~s2s2~0) (<= (+ ~nomsg~0 1) 0) (<= |#NULL.base| 0) (<= 0 (+ ~cs1_new~0 1)) (<= (+ 2 ~active_side_History_1~0) 0) (<= (+ ~cs1_new~0 1) 0) (<= 0 (+ ~nomsg~0 1)) (<= 0 (+ 2 ~active_side_History_2~0)) (<= 0 (+ ~side1_written~0 1)) (<= ~side2_written~0 0) (<= 0 ~s1s2~0) (<= ~s1s1~0 0) (<= 0 ~s2s1~0) (<= 0 |#NULL.offset|) (<= 0 (+ ~cs2_new~0 1)) (<= (+ ~side1_written~0 1) 0) (<= 0 |#StackHeapBarrier|) (<= (+ ~s2p_new~0 1) 0) (<= (+ ~s2s2_new~0 1) 0) (<= (+ ~s1s1_new~0 1) 0))' at error location [2021-11-23 02:21:41,282 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:21:41,282 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:21:41,282 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 14, 14] total 55 [2021-11-23 02:21:41,282 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994995691] [2021-11-23 02:21:41,283 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:21:41,283 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-23 02:21:41,283 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:21:41,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-23 02:21:41,288 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2047, Invalid=10385, Unknown=0, NotChecked=0, Total=12432 [2021-11-23 02:21:41,288 INFO L87 Difference]: Start difference. First operand 2908 states and 3490 transitions. Second operand has 55 states, 43 states have (on average 4.3023255813953485) internal successors, (185), 44 states have internal predecessors, (185), 18 states have call successors, (50), 5 states have call predecessors, (50), 17 states have return successors, (49), 24 states have call predecessors, (49), 18 states have call successors, (49) [2021-11-23 02:21:47,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:21:47,598 INFO L93 Difference]: Finished difference Result 8172 states and 10793 transitions. [2021-11-23 02:21:47,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-23 02:21:47,599 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 02:21:47,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:21:47,620 INFO L225 Difference]: With dead ends: 8172 [2021-11-23 02:21:47,621 INFO L226 Difference]: Without dead ends: 5449 [2021-11-23 02:21:47,633 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 337 SyntacticMatches, 15 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6178 ImplicationChecksByTransitivity, 53.1s TimeCoverageRelationStatistics Valid=2523, Invalid=16659, Unknown=0, NotChecked=0, Total=19182 [2021-11-23 02:21:47,634 INFO L933 BasicCegarLoop]: 435 mSDtfsCounter, 954 mSDsluCounter, 12561 mSDsCounter, 0 mSdLazyCounter, 5687 mSolverCounterSat, 230 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1010 SdHoareTripleChecker+Valid, 12262 SdHoareTripleChecker+Invalid, 5917 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 230 IncrementalHoareTripleChecker+Valid, 5687 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:21:47,635 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1010 Valid, 12262 Invalid, 5917 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [230 Valid, 5687 Invalid, 0 Unknown, 0 Unchecked, 4.2s Time] [2021-11-23 02:21:47,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5449 states. [2021-11-23 02:21:48,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5449 to 2879. [2021-11-23 02:21:48,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2879 states, 2115 states have (on average 1.1933806146572103) internal successors, (2524), 2141 states have internal predecessors, (2524), 466 states have call successors, (466), 297 states have call predecessors, (466), 297 states have return successors, (466), 440 states have call predecessors, (466), 466 states have call successors, (466) [2021-11-23 02:21:48,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2879 states to 2879 states and 3456 transitions. [2021-11-23 02:21:48,038 INFO L78 Accepts]: Start accepts. Automaton has 2879 states and 3456 transitions. Word has length 142 [2021-11-23 02:21:48,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:21:48,038 INFO L470 AbstractCegarLoop]: Abstraction has 2879 states and 3456 transitions. [2021-11-23 02:21:48,039 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 02:21:48,039 INFO L276 IsEmpty]: Start isEmpty. Operand 2879 states and 3456 transitions. [2021-11-23 02:21:48,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-23 02:21:48,077 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:21:48,077 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:21:48,115 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 02:21:48,277 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:21:48,277 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:21:48,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:21:48,279 INFO L85 PathProgramCache]: Analyzing trace with hash -2095281087, now seen corresponding path program 1 times [2021-11-23 02:21:48,279 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:21:48,279 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [48369597] [2021-11-23 02:21:48,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:21:48,279 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:21:48,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:21:48,410 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 02:21:48,410 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:21:48,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [48369597] [2021-11-23 02:21:48,411 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [48369597] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:21:48,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1412390223] [2021-11-23 02:21:48,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:21:48,411 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:21:48,412 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:21:48,412 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:21:48,432 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9f91b70d-e2a8-43c2-ab46-5d10e985341d/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 02:21:48,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:21:48,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 716 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 02:21:48,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:21:49,167 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 02:21:49,167 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:21:49,452 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 02:21:49,452 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1412390223] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:21:49,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [169275512] [2021-11-23 02:21:49,455 INFO L159 IcfgInterpreter]: Started Sifa with 77 locations of interest [2021-11-23 02:21:49,456 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:21:49,456 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:21:49,456 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:21:49,456 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs